AN6472NFBP

AN6472NFBP PANASONIC | Alldatasheet

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Technical content

The AN6472NFBP is a speech network IC which includes a receiver noise reducing function and is most suitable for quality cordless telephones. It incorporates a cross-point switch controlled by serial input. It allows speech path switching and mixing, and provides for three- or four-person communication and other sophisti- cated functions. It also incorporates REC/PLAY amplifiers with VOX circuits. n Features

• The speech block can operate on line voltage, with no external power supply, and is operational even during a commercial power failure.
• Incorporates a receiver noise reducing function to improve the handset's howling margin.
• Incorporates auto. PAD, dial mute, DC voltage regula- tion, and other basic speech functions.
• The cross-point switch can be operated independently.
• Each output of the cross-point switch can correspond to multiple inputs, allowing three- or four-person commu- nication.
• The REC/PLAY amplifiers incorporate ALC and VOX circuits.
• Receiver volume can be increased by 6 dB or 9 dB. AN6472NFBP Cordless Telephone Speech Network IC Incorporating Cross-Point Switch 0.35–0.1 0.1–0.1 0.55 1.3–0.25 2.8–0.2 14.0–0.3 17.2–0.4 QFP package with 64 pins (QFH064-P-1414) Unit : mm 0.15 1.3–0.25 0.8 14.0–0.3 17.2–0.4 17 32 +0.1 –0.05

ICs for TelephoneAN6472NFBP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 6dB 0dB 0dB Det. 30dB AP Control AP 0dB 0dB V REF 0dB AP DMC DMC V CC 0/6/9dB L(27) L(17) L(1F) 0dB DMC DMC 0dB 0dB L(OF) V CC +– +–L(3F) DC Control DM Control V REF L(07) ALC Det. 0dB 0dB VOX Det. Noise Protection Decoder Latch Power Supply Control INJ P.O.R Line Supply Monitor D COMP ALC10dB 0dB 0dB 0/12 dB dB dB dB DCC GND GND GND n Block Diagram

ICs for Telephone AN6472NFBP n Pin Descriptions Pin No. Description Ground Line power (+) input Side-tone adjustment Line voltage control (1) Int. ref. voltage output (2) Int. ref. voltage output (1) Trans. preamp. output Noise reduction detection output Noise reduction detection input Noise reduction amp. output Auto. PAD control Rec. preamp. input Rec. preamp. output Rec. amp. input Rec. amp. output (1) Rec. amp. output (2) BT signal input DTMF preamp. output DTMF signal input MIC preamp. output MIC preamp. input (1) MIC preamp. input (2) Dial mute control Line voltage control Line interruption detector output Strobe signal input Clock signal input Data input Ground Logic power supply input VOX detector output SP link output Pin No. Description RF2 link output RF1 link output Intercom link output VOX detection control VOX amp. input Time stamp link output Recording link output ALC input ALC detection control Loudspeaker link input Recording input Recording inverse input Recording preamp. output Recording bias current control To recording head EQ amp. inverse input EQ amp. output REC/PLAY int. ref. voltage output Ground MIX preamp. output MIX link input AUX preamp. output AUX link input Intercom link input RF1 link input RF2 link input Power-ON reset control External supply voltage input Internal supply voltage output Circuit voltage control (2) Line current bypass (2) Line current bypass (1) *1 In a free-air condition with Ta=75˚C V CC ICC V L IL PD Topr Tstg Supply voltage (1) Supply current (1) Supply voltage (2) Supply current (2) Power dissipation*1 Operating ambient temperature Storage temperature V mA V mA mW Parameter Symbol Rating Unit n Absolute Maximum Ratings (Ta=25˚C) 7.0 12.0 135 640 –20 to+75 –55 to+150

ICs for TelephoneAN6472NFBP Parameter Symbol Range n Recommended Operating Range Operating supply voltage range (1) Operating supply voltage range (2) V CC V L 4.5V to 5.5V 3.0V to 11.0V Parameter Symbol min 4.5 1.6 1.2 1.6 0.8 1.6 1.2 0.8 0.8 5 5.5 250 V CC V kHz µs µs µs µs µs µs µs µs µs µs V typ max Unit Condition n Recommended Operating Conditions (Ta =20 to +75˚C) Supply voltage Clock frequency Input pulse width (high) Input pulse width (low) Clock pulse rise time Clock pulse fall time Input voltage Input pulse width Setup time Hold time V CC fCLK Input Duty 40% to 50% tW tsu th twh twl tr tr V i CLK STB DATA STB DATA STB Parameter Symbol Condition min typ max n Electrical Characteristics (Ta=25–2˚C) Power Supply Characteristics During Power Failure Normal power supply characteristics Line DC voltage (I-1) V L – I1 V3.5 3.83.2 Unit V–DCC=HIGH, IL=20mA, V CC =0V Line DC voltage (E-1) V L – E1 V3.4 3.83.1V– DCC=HIGH, IL=20mA, V CC =5V Line DC voltage (E-2) V L – E2 V4.7 5.14.3V–DCC=HIGH, IL=20mA, V CC =5V V L – E3 V6.8 7.36.3V–DCC=HIGH, IL=20mA, V CC =5V Line DC voltage H (E-1) V LH – E1 V4.85 5.44.3V–DCC=HIGH, IL=20mA, V CC =5V Line DC voltage (I-2) V L – I2 V4.8 5.24.5V–DCC=HIGH, IL=60mA, V CC = 0V Line DC voltage (I-3) V L – I3 V7.0 7.56.6V–DCC=HIGH, IL=120mA, V CC = 0V Line DC voltage H (I-1) V LH – I1 V5.0 5.54.5V–DCC= LOW, IL=30mA, V CC = 0V Line DC voltage H (I-2) V LH – I2 V6.2 6.75.7V–DCC= LOW, IL= 60mA, VCC = 0V Line DC voltage H (I-3) V LH – I3 V8.5 9.27.9V–DCC= LOW, IL=120mA, V CC = 0V Internal supply voltage (I) V reg – I V2.0 2.21.8V– DCC=HIGH, IL=20mA, V CC = 0V Internal ref. supply voltage (I) V ref – I V1.0 1.10.9V–DCC=HIGH, IL=20mA, V CC = 0V Line DC voltage (E-3)

ICs for Telephone AN6472NFBP Parameter Symbol Condition min typ max n Electrical Characteristics (cont.) (Ta=25–2˚C) Receiver During Power Failure Line DC voltage H (E-2) V LH – E2 V5.95 6.65.3 Unit V–DCC=LOW, IL=60mA, V CC =5V Rec. gain (I-1) G V – IR1 dB32.5 34.530.5IL=30mA, V CC = 0V V in= – 42dBm Rec. gain (I-2) G V – IR2 dB29 3127IL= 80mA, VCC = 0V V in= –42dBm Rec. auto. PAD width (I)*1 A P – IR dB3.5 52.5IL=30mA– 80mA, V CC = 0V, V in= – 42dBm Rec. max. output (I) Rec. noise reduction (I) V O – IR N L – IR dBm40 dB dB With IL=30mA, V CC = 0V, and THD=5% IL=30mA, V CC = 0V, V in= –42dBm V in–M= –65/–50dBm IL=30mA, V CC = 0V, V–DMC=LOW, V in= –30dBm Line DC voltage H (E-3) V LH – E3 V8.2 8.97.55V–DCC=LOW, IL=120mA, V CC =5V Internal supply voltage (E) V reg – E V4.85 5.04.6V–DCC=HIGH, IL=20mA, V CC =5V Internal ref. supply voltage (E) V ref – E V2.5 2.72.25V–DCC=HIGH, IL=20mA, V CC =5V Total circuit current Power interruption detection (1) Power interruption detection (2) Itotal V – HIT1 V – HIT2 mA27 3517 4.4 0.1 4.95 0.6 V V V–DCC=HIGH, IL=20mA, V CC =5V V L=2.7V, VCC =5V V L=1.5V, VCC =5V G V – IBT Receiver On External Power Supply Transmitter Amp. During Power Failure Rec. gain (E-1) G V – ER1 dB32.5 34.530.5IL=30mA, V CC =5V V in= –42dBm Trans. gain (I-1) G V – IM1 dB30.2 32.228.2R=27 W (Pin3), IL=30mA, V CC =0V, Vin= –38dBm Trans. gain (I-2) G V – IM2 dB26.4 28.424.4IL=80mA, V CC =0V, V in= –38dBm A P – IM dB3.8 52.5IL=30mA–80mA, V CC =0V, V in= –38dBm Rec. gain (E-2) G V – ER2 dB28.8 30.826.8IL=30mA, V CC =5V V in= –42dBm Rec. auto. PAD width (E)*1 A P – ER dB3.7 52.5IL=30mA–80mA, V CC =5V V in= –42dBm Rec. max. output (E) V O – ER dBm124With IL=30mA, V CC =5V, and THD=5% Rec. noise reduction (E) N L – ER dB81 06 IL=30mA, V CC =5V, V in= –42dBm V in–M= –65/–65dBm Rec. digital volume (1)*2 G V – DV1 dB675IL=30mA, V CC =5V, V in= –42dBm, DV–1 ON Rec. digital volume (2)*2 G V – DV2 dB9 10.57.5IL=30mA, V CC =5V, V in= –42dBm, DV–2 ON BT amp. gain (E) G V – EBT dB21.5 23.519.5 IL=30mA, V CC =5V, V–DMC=LOW, V in= –30dBm Rec. gain difference DG–R dB – 0.1 1.2–1.2For VCC =0V and 5V(between Gv–IR1 and Gv–ER1) BT amp. gain (I) Trans. auto. PAD width (I)*1 Note) Unless otherwise specified, input signal Fin =1kHz, control voltage V-DOC = high, and control voltage V-DMC = high. *1 Gain decrease when line current IL is changed from 30 to 80 mA. If pin 11 (auto. PAD control)is connected to pin 61 (int. supply voltage output), the gain will not change. *2 Gain increase from receiver gain (E-1).

ICs for TelephoneAN6472NFBP Parameter Symbol Condition min typ max n Electrical Characteristics (cont.) (Ta=25–2˚C) Transmitter Amp. On External Power Supply Trans. max. output (I-1) V O – IM1 dBm3.50 Unit With IL=30mA, V CC = 0V and HD=5% DTMF max. output (I-1) V O – ID1 dBm3.80IL=30mA, V CC =0V, V–DMC=LOW, THD=5% Trans. gain (E-1) G V – EM1 dB30.6 32.628.6IL=30mA, V CC = 0V, V in= –38dBm Trans. gain (E-2) G V – EM2 dB27.0 29.025.0IL=80mA, V CC =5V, V in= –38dBm Trans. auto. PAD width (E)*1 A P – EM dB452.5IL=30mA–80mA, V CC =5V, V in= –38dBm Trans. max. output (E-1) V O – EM1 dBm62With IL=30mA, V CC =5V and THD=5% Trans. max. output (E-2) V O – EM2 dBm62IL=30mA, V CC =5V, THD=5%, V–DCC=LOW Trans. max. output (I-2) V O – IM2 dBm3.50With IL=30mA, V CC = 0V, THD=5% and V–DCC=LOW DTMF gain (I-1) G V – ID1 dB19.5 21.517.5 IL=30mA, V CC = 0V, V–DMC= LOW, V in= –30dBm DTMF gain (I-2) G V – ID2 dB15.7 17.713.7 IL=80mA, V CC = 0V, V–DMC=LOW, V in= –30dBm DTMF max. output (I-2) V O – ID2 dBm3.50 IL=30mA, V CC = 0V, THD=5%, V–DMC=LOW, V–DCC=LOW DTMF auto. PAD width (I)*1 A P – IDT dB3.8 52.5 IL=30mA–80mA, V CC = 0V, V–DMC= LOW, V in= –30dBm DTMF gain (E-1) G V – ED1 dB20.1 22.118.1IL=30mA, V CC =5V, DM=ON, Vin= –30dBm DTMF max. output (E-1) V O – ED1 V O – ED2 dBm62IL=30mA, V CC =5V, V–DMC=LOW, THD=5% Trans. gain difference DG – M dB –0.8 0.7–1.8For VCC = 0V and VCC =5V (between Gv–IM1 and Gv–EM1) DTMF gain difference DG – MF dB –1.3 0.2–2.3For VCC = 0V and 5V (between Gv–ID1 and Gv–ED1) DTMF gain (E-2) G V – ED2 dB16.5 18.514.5 IL=80mA, V CC =5V, V–DMC=LOW, V in= –30dBm DTMF auto. PAD width (E)*1 A P – EDT dB4.1 5.52.5 IL=30mA–80mA, V CC =5V, V–DMC=LOW, V in= –30dBm DTMF max. output (E-2) dBm62 IL=30mA, V CC =5V, DM=ON, V–DMC=LOW, THD=5%Note) Unless otherwise specified, input signal Fin=1 kHz, control voltage V-DOC=high, and control voltage V-DMC=high. *1 Gain decrease when line current IL is changed from 30 to 80 mA. If pin 11 (auto. PAD control) is connected to pin 61(int. supply voltage output) , the gain will not change.

ICs for Telephone AN6472NFBP Parameter Symbol Condition min typ max n Electrical Characteristics (cont.) (Ta=25–2˚C) Recording Preamplifiers Recording Amplifier Playing EQ Amplifier VOX Detector Rec. preamp. gain G V – Rp dB45 4743 Unit V in= – 60dBm, Rin=0W Head bias current I – REC µA180 215145L–SW (h07)= ON VOX sensitivity (1) VS1 V 4.83.5I–VOX=12.5 µA VOX sensitivity (2) VS2 V 0.025 0.5I–VOX=24.5 µA Head output G V – REC mVrms50.0 63.040.0L–SW (h07)= ON, V in= –15dBm, RL=1kW EQ amp. gain G V – EQ dB29.8 31.827.8L–SW (h07)= ON, V in= – 40dBm EQ amp. output noise voltage V no – EQ mVrms0.45 1.2L–SW (h07)= ON, DIN/AUDIO, RL=1k W Rec. preamp. output noise voltage*1 V no – RP mVrms0.8 2.5DIN/AUDIO, Rg=10k W Link SW Input Amplifier Link SW Output Amplifier MIX amp. gain G V – MIX dB675V in= – 36dBm SP output gain (1)*1 G V – SPO1 dB12 1311Input AUX IN, Vin= – 36dBm, L–SW (h3A) = ON SP output gain (2)*1 G V – SPO2 dB– 0.5 0.5–1.5Input AUX IN, Vin= – 36dBm, L–SW (h3A&h2F) = ON Intercom output gain*1 G V – DHO dB20 21.518.5Input AUX IN, Vin= – 36dBm, L–SW (h3B) = ON RF1 output gain*1 G V – RF10 dB18 19.516.5Input AUX IN, Vin= – 36dBm, L–SW (h3C) = ON RF2 output gain*1 G V – RF20 dB18 19.516.5Input AUX IN, Vin= – 36dBm, L–SW (h3D) = ON W Recording output gain*1 G V – RECO dB0 1.0–1.0Input AUX IN, Vin= – 36dBm, L–SW (h3E) = ON Recording output gain*1 G V – RO dB21.4 22.919.9Input AUX IN, Vin= – 36dBm, L–SW (h38) = ON Line output gain*1 G V – TO dB19.2 20.717.7Input AUX IN, Vin= – 36dBm, L–SW (h39) = ON Rec. output gain difference*2 GD – RO dB0 1.0–1.0Input AUX IN, Vin= – 36dBm, L–SW (h30) = ON Time stamp output gain*1 G V – TSO dB0 1.0–1.0Input AUX IN, Vin= – 36dBm, L–SW (h37) = ON AUX amp. gain G V – AUX dB675V in= – 36dBm Note) Unless otherwise specified, external supply voltage VCC =5V, line current IL= 0mA, input signal frequency=1 kHz, control voltage V-DOC=high, and control voltage V-DMC = high. *1 Each amp. gain is measured from AUX OUT or MIX OUT to its output (the AUX or MIX preamp. gain is not included in the calculation). *2 The difference from the receiver output gain (Gv-RO).

ICs for TelephoneAN6472NFBP Parameter Symbol Condition min typ max Link SW Input MIC input gain*1 G v – MI dB01–1 Unit V in= –38dBm, rec. output L –SW(h0E)= ON Rec. input gain*1 G v – RI dB01–1V in= –42dBm, rec. output L–SW (h16)= ON Intercom input gain G v – DHI dB675V in= –30dBm, rec. output L–SW (h1E)= ON RF1 input gain G v – RF1I dB01–1 01–1 V in= –30dBm, rec. output L–SW (h26)= ON RF2 input gain G v – RF2I dBV in= –30dBm, rec. output L–SW (h2E)= ON SP link input gain G v – SPI dB12 1311V in= –30dBm, SP rec. output L–SW (h02)= ON Link Maximum Output SP OUT max. output V o – SP dBm40Input L–SP IN, THD=5% L–SW (h02)= ON DH OUT max. output V o – DH dBm40Input RF1 IN, THD=5% L–SW (h23)= ON RF1 OUT max. output V o – RF1 dBm40Input RF2 IN, THD=5% L–SW (h25) = ON RF2 OUT max. output V o – RF2 dBm40Input RF1 IN, THD=5% L–SW (h2C)= ON L-REC OUT max. output V o – LR dBm40Input AUX IN, THD=5% L–SW (h3E)= ON n Electrical Characteristics (cont.) (Ta=25–2˚C) Note) Unless otherwise specified, external supply voltage VCC =5V, line current IL= 0mA, input signal frequency=1 kHz, control voltage V-DOC= high, and control voltage V-DMC= high. *1 Each amp. gain is measured from MIC OUT or R PRE OUT to its output. Parameter Symbol Condition min typ max Controls V DMC – H V2 Unit Dial mute high level voltage IDMC – H µA38 8015Dial mute high level control current V DMC – L V0.3– 0.2Dial mute low level voltage IDMC – L µA–20 –10– 40Dial mute low level control current V DCC – H V2DC voltage control high level voltage V CC + 0.2 V CC + 0.2 IDCC – H µA25 5010DC voltage control high level control current V DCC – L V0.4– 0.2DC voltage control low level voltage V– DMC = 5V V– DMC= 0V V – DCC= 5V V– DCC= 0VI DCC – L µA– 0.1–2DC voltage control low level control current Note) Unless otherwise specified, VCC =5V, and IL = 20 mA. n Electrical Characteristics (cont.) (Ta=25–2˚C)

ICs for Telephone AN6472NFBP V DIN – H V2 IDIN – H µA160 25070 V DIN – L V0.3– 0.2 V– DIN=5V V– DIN = 0VIDIN – L µA– 0.1–1 Data input high level voltage V CC + 0.2 Data input high level control current Data input low level voltage Data input low level control current 450 Power Supply Block AC impedance (I) ZAC – I 570 750 450 580 750 IL=80mA, V CC = 0V, V in=200mVrms, Fin=1kHz AC impedance (E) ZAC – E W W IL=80mA, V CC =5V, V in=200mVrms, Fin=1kHz n Electrical Characteristics (cont.) (Ta=25–2˚C) Input impedance Pin 56 Input Zin – DH kW9.5 10.58.5Intercom preamp. input impedance Zin – RF2 Pin 58 Input RF2 preamp. input impedance kW9.5 10.58.5 Zin – RF1 Pin 57 Input RF1 preamp. input impedance kW9.5 10.58.5 Zin – BT Pin 17 Input BT amp. input impedance kW9.5 10.78.7 Zin – ALC Pin 40 Input ALC amp. input impedance kW9.5 10.58.5 Zin – SP Pin 42 Input SP input impedance kW50.0 62.537.5 Parameter Symbol Condition min typ max Unit n Electrical Characteristics (Design Values for Reference) (Ta=25–2˚C) The following are design values for reference, not guaranteed values. Speech Block Rec. output noise voltage (I) V n – IR mVrms0.3IL=30mA, V CC =0V, DIN/AUDIO Rec. output noise voltage (E) V n – ER mVrms0.3IL=30mA, V CC =5V, DIN/AUDIO Trans. output noise voltage (I) V n – IT mVrms0.3IL=30mA, V CC =0V, DIN/AUDIO Trans. output noise voltage (E) V n – ET mVrms0.3IL=30mA, V CC =5V, DIN/AUDIO Dial mute trans. amp. mute attenuationM – TDM dB 75 IL=30mA, V CC =5V, V in= –30dBm, V– DBM–H/L Rec. output mute attenuation M – RO Zin – R dB 50 IL=30mA, V in= –30dBm, V CC =5V, Lsw (h27)= OFF/ON Pin 12 InputRec. preamp. input impedance kW500 Zin – M Pin 21 and 22 InputMIC preamp. input impedance kW500 IL=30mA, V in= –30dBm, V CC =5V, Lsw (h3F)=OFF/ON Trans. preamp. mute attenuation M – TM dB70 REC/PLAY Block ALC amp. ALC width W – ALC dB40IL= 0mA, VCC =5V, and ALC output distortion≤2% ALC amp. ALC effect DALC dB 1IL=0mA, V CC =5V, and V in= –45dBm to –20dBm Rec. amp. mute attenuation M – REC dB 80 V CC =5V, Vin= –10dBm IL= 0mA, and LSW (h07)= ON/OFF Parameter Symbol Condition min typ max Unit

ICs for TelephoneAN6472NFBP The following are design values for reference, not guaranteed values. n Electrical Characteristics (Cont.) (Design Values for Reference) (Ta=25–2˚C) M –EQ V CC =5V, Vin= –30dBm IL= 0mA, LSW(h0F)=ON/OFF Pin 43 input dB80 Rec. preamp. input impedance EQ amp. mute attenuation Zin–REC kW10 V CC =5V, IL=30mA, AC output measured at link ON/OFFLink SW mute attenuation M –LS dB75 Pins 47 and 48 inputEQ amp. input impedance Z in–EQ kW500 V CC =5V, IL=30mA, cross talk to line during VOXVOX cross talk V OX–CT dBm–70 Pin 47 inputVOX amp. input impedance Z in–VOX kW500 Pin 53 inputMIX preamp. input impedance Z in–MIX kW500 Pin 55 inputAUX preamp. input impedance Z in–AUX kW500 Pin 25 inputCPC output impedance Z out–CPC kW100 Pin 9 inputNoise reduction amp. input impedance Zin–NL W45 Link Switch Parameter Symbol Condition min typ max Unit n Pin Descriptions Waveform Description RemarksPin No. Pin name I/O Equivalent circuit I O I O O O GND VL ST Vref Ground :

• This is the ground pin for the speech network. GND for REC/PLY, VREG, SPEECH and LINK Line power input:
• Connects to the positive out- put of the diode bridge. Side-tone adjustment: Grounded through R1 (27W )
• Connects to the side-tone adjusting circuit to adjust side tone and receiver level. Line voltage control (1) : Int. ref. voltage output (2) :
• Output impedance=50W Int. ref. voltage output (1) :
• Outputs half the Vreg reference voltage. Trans. preamp. output :
• C7 as connected between this pin and the ground forms a low-pass filter. Vref– SN FILTER VL– CONT DC 3 ~10V DC 0.3V DC1V (Const) (Const) DC1V TO 24kW kW Vreg 6kW G = ZLine//ZTel G= 20log 300 = 20.9db The line drive gain (G) is : Also assuming ZLine»600W ZTel »600W R1= 27W C2 and the internal resistance determine the f. characteristics. Grounded through a 0.01µF capacitor. Note) The symbols are the same as those used in the application circuit.

ICs for Telephone AN6472NFBP n Pin Descriptions (cont.) Waveform Description RemarksPin No. Pin name I/O Equivalent circuit I O I I O O O I O I APC RV IN Noise reduction detection amp. out- put : A smoothing capacitor C6 and R5 connect to this pin to adjust the attack and recovery times of noise reduction.

• Noise reduction detection amp. input : Noise reduction amp. output is fed through C7 and R6 to this pin.
• Noise reduction amp. output : Connects to the noise reduction detection amp. input. Auto. PAD control :
• Connects through a resistance to Pin 61(Vreg). If the resistance increases, the PAD operates closer to the near end. If the resistance decreases, the PAD operates closer to the far end. Rec. preamp. input :
• Receiver signals are input from the side-tone circuit to this pin.
• R8 and C9 connected between Pin 1 3 and this pin determine the f. characteristics. Rec. preamp. output :
• R8 and C9 connected between Pin 12 and this pin determine the f. charac- teristics.
• The output impedance is up to 1 kW . Rec. amp. input : Rec. amp. outputs (1 and 2) :
• A ceramic or dynamic receiver is connected.
• The output circuit is a BTL configuration.
• The output impedance is up to 50 W . BT signal input :
• BT (beep tone) signals are input through C15 to this pin.
• Input impedance is 10 kW . DTMF preamp. output :
• A C/R combination between Pin 19 and this pin determines the f. characteristics of the DTMF preamp. DTMF signal input :
• DTMF signals are input through a capacitor to this pin.
• DTMF signals are enabled when DMC is low at Pin 40. VN DET– IN RV PREOUT BT– IN MF – IN RV FILTER RV OUT (1) RV OUT (2) MF – OUT VN OUT Vreg-R · I IL VN DET V REF – SN V REF – SN Signal input V REF – SN Signal input G = 64K
• This pin must be grounded if noise reduction is not used.
• The greater C7, the lon- ger the attack time. The smaller R6, the shorter the recovery time.
• Noise reduction detec- tion amp. gain (G) is : 1 1 G = – R9 + jw C9 R8 + jw C10 In the application circuit, MIC. IN (–) is input through a capacitor. This capacitor and R12-R14, and C15 and C16 deter- mine the f. characteris- tics. The 10 kW input impe- dance and C12 or C13 form a HPF. DC (with a capacitor) Input V REF V REF – SN V REF – SN V REF – SN V REF – SN 64kW Vref–SN 3kW Vref–SN 0.1µF 95kW I Iµ IL 1312 10kW 30kW 10kW +17 10kW Vref–SN Vref–SN 10kW V REF – SN Full-wave detection (with no capacitor) Pin 8 output The receiver preamplifier gain (G) is :

ICs for TelephoneAN6472NFBP O I I I I O I I I DMC CPC STR CLK DATA MIC preamp. output :

• R12 and C14 connected between Pin 22 and this pin determine the f. characteris- tics.
• The output impedance is up to 1 kW . MIC preamp. input (1) :
• A bias resistor and a micro- phone connect to this pin. MIC preamp. input (2) :
• R12 and C14 connected between Pin 20 and this pin determine the f. characteristics. Dial mute control :
• Normal speech mode when Pin 23 is high or open (MIC amp. ON and rec. amp. ON).
• DTMF mode when Pin 23 is low (DTMF amp. ON and BT amp. ON). Line voltage control :
• Line voltage is normal when the input voltage at this pin is high. Line voltage increases by 1-1.5 V when the input voltage is low. Line interruption detector output :
• This is an open collector output to a microprocessor, requiring a pull-up resistor connected to the microproc- essor's power supply. This pin goes low when line voltage is 3.0 V or more, and goes high when 1.5 V or less. Strobe signal input :
• The strobe signal for serial control data is input to this pin. The rising edge of the strobe signal determines the timing at which internal con- trol address or ON/OFF status is validated. Clock signal input :
• The clock signal for serial control data is input to this pin. The rising edge of the clock signal determines the timing at which data is read. Data input :
• Serial data is input to this pin. Data is read into the internal shift register in synchroniza- tion with clock signals. MIC OUT MIC IN (+) MIC IN (–) DC – CONT V CC 0.2V Line DC voltage L–V CC 0.2V Line interruption V REF – SN 10kW Vref 100kW 200kW 200kW 150kW 300kW L–V CC 10kW 300kW L–V CC 10kW 300kW L–V CC 10kW 56kW L–V CC 144kW VL 100kW V REF – SN V REF – SN n Pin Descriptions (cont.) Waveform Description RemarksPin No. Pin name I/O Equivalent circuit

ICs for Telephone AN6472NFBP O O O O O O I O O GND Ground :

• This is the ground pin for the logic circuits. Logic power supply input : V OX detector output :
• This is an open collector out- put.
• This pin goes high when voice signals are input to Pin 37. Loudspeaker link output :
• This is a link switch output to an external loudspeaker ampli- fier.
• The output amplifier gain is selectable between 12 and 0 dB.
• Output impedance is 50 – 30W . RF2 link output :
• This is a link switch output.
• Output impedance is 50W . RF1 link output :
• This is a link switch output.
• Output impedance is 50W . Intercom link output :
• This is a link switch output to an intercom.
• Output impedance is 50W . VOX detection control :
• A smoothing capacitor (C18) and a resistor (R18) connect in parallel to this pin to adjust the attack and recovery times of the VOX detector. VOX amp. input :
• VOX (voice detection) signals are input to this pin.
• Input impedance is 500W . Time stamp link output :
• This is a buffered link switch output.
• Output impedance is 50W . Recording link output :
• This is a buffered link switch output.
• Output impedance is 50W . V CC VOX– OUT SP– OUT RF2– OUT RF1– OUT DH– OUT VOX DET VOX IN LTS– OUT LRC– OUT V REF – SN V REF – SN V REF – SN V REF – SN Voice ON L · VCC V REF – SN V REF – SN 50kW Vref – SN From LINK SW 30kW10kW 0/12dB Vref 50kW Vref – SN From LINK SW 90kW10kW 50kW Vref– SN From LINK SW 68kW10kW Vref–PR–+ 500 500 From LINK SW When address 2F of the cross-point switch is OFF, the output amplifi- er gain is set to 12 dB. VOX detection can be done in two ways : A) With small C18 (560 pF) and small R18 (39kW ) VOX input VOX output B) With large C18 (22 µF) and large R18 (100 kW ) VOX input VOX output DC (with a capacitor) Pin 37 input n Pin Descriptions (cont.) Waveform Description RemarksPin No. Pin name I/O Equivalent circuit Half-wave rectification (with no capacitor)Pin 36 output

ICs for TelephoneAN6472NFBP I O I I I O I/O I O O HEAD GND ALC input :

• Pin 45 connects through a coupling capacitor to this pin.
• Input impedance is 10kW . ALC detection control :
• A smoothing capacitor (C20) and a resistor (R20) connect in parallel to this pin to adjust the attack and recovery times of the ALC. Loudspeaker link input : SP signals to this pin are output through a coupling capacitor to the link switch.
• Input impedance is 50kW . Recording input :
• Recording signals are input through a coupling capacitor to this pin.
• Input impedance is normally 10kW . It decreases during ALC operation. Recording preamp. inverse input :
• A/CR combination between Pin 45 and this pin determines the gain and f. char- acteristics of the recording preamplifier. Recording preamp. output :
• Outputs amplified recording signals.
• Output impedance is 50W . Recording bias current control :
• A C/R combination connected to this pin determines the recording bias cur- rent and gain of a recording head.
• The smaller the resistance of the C/R combination, the greater the bias cur- rent and gain. To recording head :
• A recording head connects to this pin. EQ amp. inverse input :
• A C/R combination between Pin 49 and this pin determines the equalizer characteristics. EQ amp. output :
• Outputs amplified equalizer signals.
• Output impedance is 50W . REC/PLAY int. ref. voltage output :
• The Pin 5 ref. voltage is buf- fered and output from this pin.
• Output impedance is 50W Ground : RD PRE – IN RD PRE – NF BIASS ADJ EQ. NF EQ. OUT REC PRE – OUT V REF – PR ALC. IN ALC. DET SP – IN V REF – SN V REF – SN V REF – SN V REF – PR V REF – PR V REF – PR V REF – SN Bias voltage During playing During recording
• Ground Pin 41 if no ALC circuit is used.
• The larger C20, the lon- ger the attack time. The smaller R20, the shorter the recovery time The gain (G) of the recording preamplifier is
• Address 07 of the cross- point SW determines the ON/OFF status of the rec. preamp.
• The bias current to the head is :
• The gain of the equaliz- er amp. is calculted the same way as the receiv- er preamp. Address OF of the cross- point SW determines the ON/OFF status of the EQ amp. Vref– PR from recording head 49 Vref G = – R22+jw C23 R23 IH = · 3R25 VREF -PR V REF -PR = V reg V REF (CONST) Vref–PR 10kW from ALC 22kW n Pin Descriptions (cont.) Waveform Description RemarksPin No. Pin name I/O Equivalent circuit DC (with a capacitor) Input Full-wave rectification (with no capacitor) Pin 41 output Vref – PR 2kW VRE G Vref – SN to LINK SW 50kW 50kW VREG 4746 –+–+–+

ICs for Telephone AN6472NFBP 52 O 53 I 54 O 55 I MIX preamp. output :

• A C/R combination between Pin 53 and this pin determines the gain and f. characteristics of the MIX preamp.
• Output impedance is 50W . MIX link input : MIX signals are input through a coupling capacitor to this pin. AUX preamp. output :
• A C/R combination between Pin 55 and this pin determines the gain and f. characteristics of the AUX preamp.
• Output impedance is 50W . AUX link input : AUX signals are input through a coupling capacitor to this pin. Intercom link input :
• Intercom signals are input through a coupling capacitor C30 to this pin.
• Input impedance is 10kW RF1 link input :
• RF1 signals are input through a coupling capacitor C31 to this pin.
• Input impedance is 10kW . RF2 link input :
• Same as above. Power-ON reset control :
• C33 between this pin and GND determines the power- ON reset time of the logic cir- cuits. External supply voltage input :
• –5–0.5V power supply is input to this pin. Internal supply voltage output :
• A power supply derived from line voltage is output from this pin to the internal speech net work. Circuit voltage control (2) :
• This pin is grounded through C36. Line current bypass (1) :
• Line current is bypassed from this pin through R36 to Pin 2. R36 must be 1/2 W or more. Line current bypass :
• Line current is bypassed from this pin through R35 to GND. R35 must be 1/2 W or more. AUT IN

56 IDH IN

57 I RF1

V REF – SN V REF – SN V REF – SN V REF – SN 58 I 59 I V REF – SN –0.5V 61 O 63 O PD164 I DC 2V during power failure V CC to 0.2V 2 to 5 VDC depending on V L 0 to 3 V depending on VL DC DC Same as above V L–33W · IL The gain of the MIX preamp. is calculated the same way as the rec. preamp. The gain of the AUX preamp. is calculated the same way as the rec. preamp. The input impedance as illustrated left and C30, C31, or C32 form a HPF. Z Tel is 1.5-2.0kW on the IC side. It must be adjusted to 600W by inserting a 820W resistor between VL and GND. C36 (typically 47µF) determines how the cir- cuit voltage fluctuates. The larger C33, the longer the power-ON reset time.

• The power-ON reset signal is output when the supply voltage reaches 4V. Vref–SN to LINK SW n Pin Descriptions (cont.) Waveform Description RemarksPin No. Pin name I/O Equivalent circuit Vref–SN 10kW to LINK SW to LINK SW Vref–SN 10kW V CC Comparator 50kW 150kW VL Power supply VL 33W 15W 2 64 820W 100µF R36 33W V L64 Vref–SN to LINK SW Reset signal

ICs for TelephoneAN6472NFBP Clock Data Strobe 10 0 1 1 01 Logic Specifications n Basic Block Diagrams n Time Charts (Assuming the address h26 latch is to be set) 1. Data is read into the shift register in synchronization with a rising edge of the clock, with the higher data being shifted sequentially on a first-come highest-bit basis. 2. When the strobe is low, data is shifted sequentially on the sift register in synchronization with the clock. Data on the latch circuit will not change. 3. When the strobe goes high, the latched data whose address is represented by the highest six bits of the shift register is updated. Latched data is set when the least significant bit is 1, and reset when the bit is 0. 4. Referring to 3 above, if the address is h00 (the highest six bits of the shift register are all 0s), the latch circuit is cleared (all reset) regardless of the data content. 5. At power-on (VCC ON), the latch circuit is cleared (by power-ON reset). Decoder (6 bit, 48 channels) A6 A5 A4 A3 A2 A1 D Reset Clock Data Strobe Latch Circuit Decoder Shift Register Output (cross-point SW and other controls)

ICs for Telephone AN6472NFBP Loudspeaker Microphone Receiver Intercom RF1 RF2 MIX AUX Input Handset rec. Time stampOutput n Logic Circuits Address Specifications 1. Cross-point switch Note) Empty space means “not applicable.” Address is in hexadecimal. Line ouput Loudspeaker Intercom RF1 RF2 Recording 2. Other control switches Address Description

00 Cross-point SW all reset

07 Recording amp. ON 0F Playing amp. ON

17 Receiver volume 6 dB up

1F Receiver volume 9 dB up 27 Handset receiver amp. mute 2F SP output amp. gain 12 dB down 3F MIC preamp. mute 09, 21, 29 Receiver noise reduction is enabled. Note) Address is in hexadecimal.

ICs for TelephoneAN6472NFBP CLK DATA STR tW (STB) tsu (STB) th (STB) 2.5V tsu (DATA) th (DATA) tr (CLK) tf (CLK) 2.5V 2.5V 2.5V2.5V2.5V tWL (CLK)tWh (CLK) 1/fCLK 10% 90% 90% 10% 2.5V n Timing Charts 400 600 1,200 1,600 0 25 50 100 75 125 150 Ambient Temperature Ta (˚C) Power Dissipation PD (mW) 1,400 1,000 800 200 900mW 640mW PD —Ta

ICs for TelephoneAN6472NFBP n AN6472NFBP Applicant Circuit 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 0dB 0dB COMP +– +– Vref APControl DC Contorol DM Contorol D Latch INJ. ALC ALC Detector Vref Decorder Data Input dB dB dB dB 0dB 0dB 0dB 10dB 0dB Power Supply ControlPower Interruption Detector P.O.R 0dB 0dB0dBAP Noise Protector 30dB Detection AP NoiseControl 0dB 0dB 0dB 0/6/9dB DMC DMC L(17) L(1F) L(27) VccVccDMC DMC L(3F)DCC VOX Detector L(07) L(07) L(2F) +++ ++++ + + SP OUT VOX OUT LOGIC V CC R17 120kW C17 100µF LOGIC GND DATA CLK STR CPC V CC 100kW R16 100kW V CCSW1 SW2 VREG MIC MIC IN+ C16 0.068µFR14 10kW R15 2.2kW MIC IN– C15 4.7µF R13 10kWR12 27kW MICOUT C14 0.0015µF R11 10kW R10 10kW C13 0.068µF DTMF IN DTMF OUT BT IN C12 0.068µF JP3Rout2 SP Rout1 C38 0.1µF RFILTER Rout Rin C10 0.068µF 47kW 0.001µF 12kW C8 0.1µF R7 6.8kW C7 0.1µF R6 10kW R5 100kW C6 10µF C5 0.01µF C3 0.01µF C4 100µF VREF JP1 C2 22µF R2 470W R1 27W 0.022µF 4.7kW 7.7kW R5 12kW R37 820W C37 100µF JP2 GND R36 33W 15W R35 15W C36 47µF C35 100µF VREG RF2 IN C34 100µF C33 47µF C32 0.068µF RF1 IN DH IN C31 0.068µF C30 0.068µF MIX IN AUX OUT AUX IN R34 10kW C29 0.068µF R32 20kW C28 0.068µFR33 10kW R31 20kW MIX OUT PV-VREF C27 100µF R30 330kW R29 10kW C27 0.01µF EQ OUT R28 200WC26 22µF C26 1µF PLAY IN REC OUT R27 1kW C25 0.47µFR27 1kW R25 47W C24 R23 56kW R24 1kW22µF C23 0.01µF R22 10kW C22 0.15µF R21 10kW REC IN RPRE IN C21 0.1F JP7 R20 220kW C20 22µF JP6 JP8 LINK-SP IN JP5 C39 0.068µF TS OUT JP4 R19 10kW C19 0.033µF ALC IN LINK-R OUT VOXIN C18 0560pF R18 10kWDH. OUT RF1. OUT RF2. OUT 6dB