AS2535P

AS2533 ARTSCHIP | Alldatasheet

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1Rev. 7 July 1998 Data Sheet AS2533...6 Multi-Standard CMOS Single Chi p Telephone IC with Dual Soft Clippin g Packag e Available in 28 pin SOIC or DIP. LINE ADAPTATION POWER EXTRACTION DC MASK DIALLER SOFT CLIP AGC LI STBRI LINE CURRENT SENSE VDD CS LS MUTE RO ZBAL VDD MO FCI MELODY SEQUENCER RING FREQUENCY DISCRIMINATION CONTROL LOGIC HS/DP C4C3C2C1 3.58 MHz OSC Vss AGND La Lb LLC RAM OSC LLC Hi LLC Lo LLC Off AS253x MODEMFL TONE GENERATOR AGND LED CI KEY PAD Key Feature s ❑ Line/speech circuit, LD/MF repertory dialler and tone ringer on one 28 pin CMOS chip ❑ Operating range from 13 to 100 mA (down to 5 mA with reduced performance) ❑ Soft clipping to avoid harsh distortion ❑ Volume control of receive signal ❑ Line loss compensation selectable by pin option ❑ Low noise (max. - 72 dBmp) ❑ Real or complex impedance ❑ NET 4 compatible ❑ LD/MF switchable dialling ❑ Pacifier tone during programming ❑ 31 digit last number redial ❑ Repertory memories (not AS2534), 4 direct/10 indirect (AS2533/6), 12 direct (AS2535) ❑ Repeat dialling by busy or engaged (not AS2535) ❑ Sliding cursor protocol with comparison ❑ Pause key for access pause or wait function ❑ 3 flash keys, 100 ms, 280 ms and 375/600 ms ❑ On chip MF filter (CEPT CS 203 compatible) ❑ Ring frequency discrimination ❑ 3-tone melody generator Block Diagramm e General Descriptio n The AS253x is a CMOS integrated circuit that contains all the functions needed to form a high performance electronic telephone. The device incorporates LD/MF repertory dialling, melody generation, ring frequency discrimination and a high quality line/speech circuit. A RAM is on chip for a 31 digit last number redial and memories (not AS2534) each containing up to 21 digits/ data. The sliding cursor procedure makes the LNR function easy to use under various PABX systems. Also centrex keys (not AS2535) are provided. The device incorporate a volume control for the earpiece. The volume can be controlled by the VOL key (+ 5.4 dB) or by the –/+ keys (+8.1 dB/-5.4 dB in 5 steps). The versatility of the circuit is provided by pin options and a few external components. This allows easy adaptation to different PTT requirements. ARTSCHIP

2Rev. 7 July 1998 Data Sheet AS2533...6 Pin Description Pin # Symbol Function

23 M1 Microphone Inputs

24 M2 Differential inputs for the microphone (electret). 3R O Receive Output This is the output for driving a dynamic earpiece with an impedance of 140 to 300 Ω . 5A GND Analogue Ground This is the analogue ground for the amplifiers.

28 RI Receive Input

This is the input for the receive signal.

6 STB Side Tone Balance Input

This is the input for side tone cancellation. 1L S Line Current Sense Input This is the input for sensing the line current.

27 LI Line Input

This input is used for power extraction and line current sensing.

25 CS Current Shunt Control Output

This N-channel open drain output controls the external high power shunt transistor for the modulation of the line voltage and for shorting the line during make period of pulse dialling. DD Positive Voltage Supply This is the supply pin for the circuit.

26 V SS Negative Power Supply

PDM output of the melody generator for tone ringing. Hi-Z when not active.

21 FCI Frequency Comparator Input

This is a Schmitt trigger input for ring frequency discrimination. Disabled during off-hook.

10 HS/DP Hook Switch Input and Dial Pulse Output

This is an I/O that is pulled high by the hook switch when off-hook and an open drain pulls it low during break periods of pulse dialling and flash.

11 OSC Oscillator Input

Pin for ceramic resonator (3.58 MHz). Recommended: Murata CSA 3.58MG312AM.

9 LLC Line Loss Compensation

Select pin for line loss compensation (see also figure 4 to 7). LLC = A GND : 20 - 50 mA LLC = V DD : 45 - 75 mA LLC = V SS : none.

22 LED LED Output Driver

Output for driving an LED that will be flashing when in Programme/Mute state. Continues…

3Rev. 7 July 1998 Data Sheet AS2533...6 Pin Description cont´d Pin # Symbol Function

12 MODE Signalling Mode Select Input

Row 1 LD mode, 10 pps, 33/66 ms Row 2 LD mode, 10 pps, 40/60 ms Row 3 LD mode, 20 pps, 33/66 ms Row 4 LD mode, 20 pps, 40/60 ms Row 5 LD mode, 10 pps, 33/66 ms, Temp. MF with tone on first * key entry Row 6 MF only, 82/82 ms Row 7 MF only, 82/160 ms During temporary MF: 82/160 ms

20 R1 Keyboard Rows

19 R2 (see key arrangement in figure 2)

16 C1 Keyboard Columns

15 C2 (see key arrangement in figure 2)

7C I Complex Impedance Pin For complex impedance a capacitor should be connected to this pin.

2 MFL MF Level Setting

A voltage divider connected from this pin to A GND and VSS can be used to set the DTMF level. Selection Overview Function AS2533 AS2534B AS2534E AS2535 AS2536 Direct memories (one-key) 4 0 0 12 4 Indirect memories (two-key) 10 0 0 0 10 Repeat dialling yes yes yes no yes LNR key yes yes yes yes yes Pause insertion by LNR key yes yes yes yes yes Pause (PS) key yes yes yes no yes P/M or MT key P/M P/M MT P/M P/M Tone/Pulse (T/P) key yes yes yes no yes Temperary MF by * key yes yes yes yes yes Centrex (A - D) keys yes yes yes no yes Volume (VOL, –/+) keys yes yes yes yes yes Volume reset by off-hook yes no no yes no Programming of tone ringer yes yes no yes yes R3 Flash duration 600 ms 600 ms 375 ms 600 ms 600 ms

5Rev. 7 July 1998 Data Sheet AS2533...6 Power On Reset The on chip power on reset circuit monitors the supply voltage (VDD ) during off-hook. When VDD rises above approx. 1.2V, a power on reset occurs which clears the RAM. DC Conditions The normal operating range is from 13 mA to 100 mA. Operating range with reduced performance is from 5 mA to 13 mA (parallel operation). In the operating range all functions are operational. At line currents below 13 mA the AS253x provides an additional slope below 4.5V in order to allow parallel operation (see figure 13). The dc characteristic (excluding diode bridge) is determined by the voltage at LI and the resistor R1 at line currents above 13 mA as follows: VLS = VLI + ILINE ⋅R1 The voltage at LI is 4.5V in the normal operating range. During pulse dialling the speech circuit and other part of the device not operating is in a power down mode to save current. The CS pin is pulled to VSS in order to turn the external shunt transistor on to keep a low voltage drop at the LS pin during make periods. AC Impedance The ac impedance of the circuit is set by external components. The impedance can be real or complex. The ac impedance is determined as follows: ZAC = 33 • Z 1 The dc value of Z1 should be 30 Ω to maintain correct dc performance. Return loss and side tone cancellation can be determined independant of each other. Speech Circuit The speech circuit consists of a transmit and a receive path with dual soft clipping, mute, line loss compensation and sidetone cancellation. Transmit The gain of the transmit path is 37 dB for 600 Ω line termination from M1/M2 to LS (see test circuit figure 10). Keyboard Connections Continued (Either VOL or +/– keys) Figure 2c (AS2535) PP //MM 11 22 33 44 55 66 77 88 99 00 ** ## RR 11 RR 22 RR 33 LL NN RR VV OO LL ++ –– MM 11 MM 22 MM 33 MM 44 MM 55 MM 66 MM 77 MM 88 MM 99 MM 1100 MM 1111 C1 C2 C3 C4 MM 1122

7Rev. 7 July 1998 Data Sheet AS2533...6 The centrex keys are not stored in the RAM, and subsequently entered digits are buffered in FIFO. Last Number Redial LNR is a facility that allows resignalling of the last manually dialled number without keying in all the digits again. The LNR is repeatable after each off-hook. The current content of the RAM is overwritten by new entries. A manually entered number is automatically stored in the LNR RAM. The capacity of the RAM is 31 digits. If a number greater than 31 digits is entered, the LNR facility will be inhibited (until new entries < 32 digits) and further entries will be buffered in FIFO. Pauses can be inserted by pressing the PS key (not AS2535). Post dialled digits, i.e. digits manually entered after LNR has been invoked, are not stored in RAM but buffered in FIFO. Repeat Dialling (not AS2535) The last manually dialled number can be repeated without going on-hook by pressing the RP key. If a called number is engaged, pressing the RP key will break the line for 1.6 second (to get a new dial tone) and after a pause the number will be repeated. The repeat function is enabled when prior to pressing the RP key, a number has been dialled, and it can be invoked an unlimited number of times until next on-hook. During the 1.6 second break the device is in power down mode to save current. Recall Function A recall (R1 , R2 or R3 key) activation will invoke a flash (timed loop break), however, the R1 flash is never executed in LD mode. R2 and R3 will be executed independent of the mode. If recall is the first entry in a digit string, it will be stored in LNR RAM when digit(s) are entered after the recall. If the recall key is depressed after a digit string has been entered or dialled out, the recall will not be stored but buffered in the FIFO together with subsequently entered digit. If pressing the recall key is not followed by digit entries, the LNR RAM remains intact. After a recall a 270 ms pause will automatically be executed. Memory Keys (not AS2534) The keys M1 to M12 are direct memory access keys and the MR key (AS2533/6 only) is used for abbreviated dialling. Memory arrangement AS2533/6 AS2534 AS2535 Storable numbers 14 0 12 Direct memory keys 4 0 12 Indirect memories 10 0 0 In the on chip RAM, numbers can be stored. Each number can contain up to 21 digits (including pauses). During programming multiple pauses can be inserted by pressing the PS (not AS2535) or the LNR key. Each pause inserted within the first 5 entries will automatically be terminated after 2 seconds whereas pauses inserted after location 5 in a digit string will halt dialling and can be terminated manually by pressing the PS (not AS2535) or the LNR key. The halt function allows in-dialling to an extention on a PABX. Example (45678–123 is stored in M1, where – is a pause/wait and 123 the extention number): off-hook, wait for dial tone press M1 (45678 is dialled out) await dial tone from called PABX press PS or LNR (123 is dialled out). Memory dialling is cascadable. However, the content of one memory must be dialled out before a new can be invoked. Sliding Cursor Procedure To accommodate easy and uncomplicated redialling (LNR) behind a PABX, a sliding cursor protocol is implemented. If new entries match the previous RAM contents, pressing the LNR key will dial out the remaining digits. If there is an error in matching, the LNR will be inhibited until next on-hook, and the RAM will contain the new number. Example (LNR content 912345, where 9 is access code): off-hook, wait for PABX dial tone press 9 and wait for external dial tone press LNR (12345 will be dialled out). Tone Generator The tone generator incorporates the DTMF tones, 3 basic frequencies for the tone ringer and pacifier tones.

8Rev. 7 July 1998 Data Sheet AS2533...6 DTMF The DTMF generator provides 8 frequencies, namely: Low group Digit 1-2-3-A 697 Hz Digit 4-5-6-B 770 Hz Digit 7-8-9-C 852 Hz Digit * -0-# -D 941 Hz High group Digit 1-4-7- * 1209 Hz Digit 2-5-8-0 1336 Hz Digit 3-6-9-# 1477 Hz Digit A-B-C-D 1633 Hz (not AS2535) The MF output level can be set with an external voltage divider on pin MFL. Voltage at pin MFL (2) DTMF Level (Low Group)

1.50 V (A

GND ) -4.0 dBm 1.27 V -5.2 dBm 1.15 V -6.4 dBm 1.03 V -7.6 dBm 0.90 V -8.8 dBm 0.70 V -10.0 dBm 0.54 V -11.2 dBm 0.42 V -12.4 dBm 0.30 V -13.6 dBm 0.18 V -14.8 dBm

0.00 V (V

SS ) -16.0 dBm (ZLINE = 600 ohm) The preemphasis is 2.6 dB. The MF tones are according to CEPT recommendations. Tone Ringer (Melody/Volume) The three basic frequencies of the melodies are: F1 = 800 Hz, F2 = 1067 Hz, and F3 = 1333 Hz (± 5%). The repetition rate and the volume of the tone ringer melodies can be programmed by pressing P/M and # followed by a digit as follows (not AS2534E): DigitRepetition Rate Volume 1 1 time (50 ms pause) - 16 dB 2 1 time (50 ms pause) - 7 dB 3 1 time (50 ms pause) 0 dB (max.) 4 4 times - 16 dB 5 4 times - 7 dB 6 4 times (default) 0 dB (max.) 7 10 times - 16 dB 8 10 times - 7 dB 9 10 times 0 dB (max.)

0 None Off

The procedure is ended by repressing the P/M key. The default setting is digit 6, i.e. after a power on reset the device will start up with repetition rate 4 and maximum volume. If digit 0 is programmed, the tone ringer will be turned off until next off-hook where it will turn back to the last setting before 0. The programmed settings are stored in the on chip RAM. Repetition rate means that a sequence of 6 frequencies is repeated 1, 4 or 10 times within 1 second. The sequence of the frequencies is controlled by the sequence register as follows: Sequence F1 F2 F3 F1 F2 F3 … The AS2534E is fixed to default settings and can not be programmed to other settings. Pacifier Tone By MF dialling the DTMF tones are provided to the earpiece as comfort tone. During programming a key entry is acknowledged by a pacifier tone of 1477 Hz. The level of the pacifier tone is approximately 60 mV at the RO output. The duration is 40 ms after every key entry in programme mode. When terminating the programme mode with the P/M key an acknowledge tone of 140 ms is provided. An invalid key entry, however, will cause a termination of the programme mode indicated by a rejection tone of 4 times 40 ms with 28 ms pauses between the tone bursts. Ring Frequency Discrimination The ring frequency discriminator assures that only signals with a frequency between 13Hz and 70 Hz are regarded as valid ring signals. The time for recognising a valid ring signal is 1/f seconds, where 'f' is the ring frequency. When a valid ring signal is present for 73 ms continuously, the melody generator is activated and remains active as long as the ring signal is present. Once the melody generator has been started, the ring signal is continuously monitored and the melody generator is instantly turned on or off according to the momentary presence of a valid or unvalid ring signal respectively (until next POR or off-hook).

9Rev. 7 July 1998 Data Sheet AS2533...6 Typical Characteristics of Line Loss Compensation Fig. 4 20 30 40 50 60 70 80 (dB) Tx Gain (mA) DC Line Current LLC = VSS LLC = AGND LLC = VDD f = 800 Hz ZLINE = 600W VLS = -10 dBm Fig. 5 20 30 40 50 60 70 80 (dB) Rx Gain (mA) DC Line Current LLC = VSS LLC = AGND LLC = VDD f = 800 Hz ZLINE = 600W VLS = -10 dBm VOL = 0 dB (neutral)

10Rev. 7 July 1998 Data Sheet AS2533...6 AC Model of Speech Circuit Figure 8 ZLINE 30W300W ZBAL (10 x ZLINE) RI LI CS CI STB RO COMFORT TONES DTMF ZSYN (970W ) ZREF 32.3 x ZREF 20 k 20 k 8 k80 k 0 dB LLC & SC LLC & VOLUME 26dB 10dB 23dB12dB PRIVACY MUTE SC

11Rev. 7 July 1998 Data Sheet AS2533...6 Typical Application Complex Impedance (270 Ω + 750 Ω // 150 nF) Figure 9 Only the components necessary for presenting the complete functions of the AS253X are included. The external components might change to comply with various national PTT regulations and to interface to different transducers. Since the AS253x is a component and not a complete system, it can not be approved as a stand alone part by the standard bodies. Hence, full conformance to any standards is depending on the application in which the AS253x is being used, and therefore, approvals by the standard bodies are the responsibility of the customer and Austria Mikro Systeme will not have tested the product to meet specific standards. For further application information please refer to application note AN2201. LINE ADAPTATION POWER EXTRACTION DC MASK DIALLER SOFT CLIP AGC

30 W LI STBRI

3.58 MHz OSC Vss AGND 2k20.68 mF LLC 5M1 RAM 5V1 220 k220 k 300W OSC 330 k LLC Hi LLC Lo LLC off AS253x 100 mF 470 k 220 k 10 n MODE 100 m 10 m 1 m 2k2 1k8 1k8 10 n 10 n 4148 10 k 10V

1 M 10 mF

(see fig. 2) 7k5 10 n 15 n 100 k56 k 300W

12Rev. 7 July 1998 Data Sheet AS2533...6 Operating Procedures Procedure Principles The procedures for utilizing the features of the AS253x are optimized out of consideration for the human factor in order to: - meet the user´s expectations - be easy to learn and relearn - not invoke any automatic functions which the user doesn´t expect - protect the user from committing critial errors, e.g. dialling wrong numbers, deleting stored numbers, etc. - be consistent, simple and usable. The following pages describe the operating procedures for the provided features. Pressing an unvalid key or key combination during programming will cause the device to abort the programme state. Pressing any key combination or sequence which is not described or defined may cause the device to enter a state or mode that does not comply with the expectation of the user. In such cases, any undesired state can be terminated at any time by going on-hook / off-hook which will generate a functional reset. Idle (on-hook, no ringing) Speech mode Programming False programme entry Invalid entry TEXT State according to text Privacy mute X sec or Time out (x sec.) Dialling (LD or MF) Storing (writing into RAM) Processing according to text TEXT reading from memory K EY Going off-hook Going on-hook Pressing a key Entering a number Entry according to text TEXT Symbols STATES ENTRIES PROCESSING

13Rev. 7 July 1998 Data Sheet AS2533...6 Programming Tone Ringer (not AS2534E) P/M P/M M 1-12 Programme State Speech circuit muted LED flashing Storing Numbers Any invalid key entry will abort programme state M R Storing Numbers Digit Repetition Rate Volume 1 1 time (slow) - 16 dB 2 1 time (slow) - 7 dB 3 1 time (slow) 0 dB (max.) 4 4 times - 16 dB 5 4 times - 7 dB 6 4 times (default) 0 dB (max.) 7 10 times (fast) - 16 dB 8 10 times (fast) - 7 dB 9 10 times (fast) 0 dB (max.)

0 None Off *

*) When digit 0 (tone ringer off) has been programmed, the device will automatically return to the previous setting (different from 0) by next off-hook.

14Rev. 7 July 1998 Data Sheet AS2533...6 Temporary MF RAM FIFO FIFO R R D FIFO EXIT FIFO Pressing any other key does not change the state. T/P T/P T/P MODE pin connected to row 1, 2, 3, 4 or 5 When MODE pin = row 5, pressing the * key also transmits the tone by MF select. The T/P key (not AS2535) can be used alternatively to the * key.

15Rev. 7 July 1998 Data Sheet AS2533...6 Storing Numbers (not AS2534) P/M P/M M 1-12 M R 0 - 9 Programme State Speech circuit muted LED flashing Programming Tone Ringer Melodies Any invalid key entry will abort programme state Entries (0-9, *, #, PS or LNR, R1, R2, R3) will be written directly into the selected memory location Key entries different to the procedure will be ignored. Exit programme mode from each state with on-hook or with the P/M key.

16Rev. 7 July 1998 Data Sheet AS2533...6 Automatic Dialling or M 1-12 0 - 9 Postdialled digits are not stored but buffered in FIFO M R LN R

17Rev. 7 July 1998 Data Sheet AS2533...6 Timing Diagrammes LD Dialling MUTE MASK HS/DPN tIDP tPDP tM tIDPtB tB tM tPDP tB tM MUTE MASK HS/DPN tIDP tPDP tM tIDPtB tB tM tPDP tB tM tAP LD Dialling With Access Pause MUTE MASK HS/DPN TONE tTD tTD tTDtITP tITP tITPtAP MF Dialling Continues....

18Rev. 7 July 1998 Data Sheet AS2533...6 Flash MUTE MASK HS/DPN tM tFD tM tPFP tM tFD tM RP key MUTE DIALLING HS/DPN Power Down Number engaged New connection tRP tAP Repeat Dialling (not AS2535)

19Rev. 7 July 1998 Data Sheet AS2533...6

Electrical Characteristics

Recommended Operating Conditions * This voltage is generated internally DC Characteristics (I LINE = 15 mA unless otherwise specified) Symbol Parameter Conditions Min Typ Max Units IDD Operating Current Speech mode 3 5 mA MF dialling 4 mA LD dialling, V DD = 2.5V 200 µA Ring mode, VDD = 2.5V 300 µA IDD0 Retention Current Idle mode, V DD = 2V 0.05 µA TAMB = 25°C VLI Line Voltage (default) 13 mA ≤ ILINE ≤100 mA 4.5 V IOL Output Current, Sink V OL = 0.4V 1.5 mA CS, HS/DP, MO IOL Output Current, Sink; LED VOL = 0.4V 4 mA VIL Input Low Voltage HS/DPN; FCI V SS 0.3 VDD V TAMB = 25°C VIH Input High Voltage HS/DPN; FCI 0.7 V DD VDD V TAMB = 25°C

20Rev. 7 July 1998 Data Sheet AS2533...6 AC Characteristics (ILINE = 15 mA; f = 800 Hz unless otherwise specified) Tx Transmit Test Circuit Fig. 10 ATX Gain, Transmit M1/M2 to LI 35.1 36.6 38.1 dB ΔATX/F Variation with Frequency f = 500 Hz to 3.4 kHz ±0.8 dB THD Distortion V LI ≤ 0.25VRMS 2% VAGC Soft Clip Level V LI =2 V PEAK ASCO Soft Clip Overdrive 20 dB tATTACK Attack Time 30 µs/6 dB tDECAY Decay Time 20 ms/6dB ZIN Input Impedance (M1/M2) 20 k Ω AMUTE Mute Attenuation Mute activated 60 dB VNO Noise Output Voltage T AMB = 25°C -72 dBmp VIN Max Input Voltage Range Differential ±1 V PEAK (M1/M2) Single Ended ±0.5 V PEAK BJT Output Driver V IN MAX Input Voltage Range (LI) ±2 V PEAK VTX Dynamic Range ±2 V PEAK RL Return Loss Z RL =1000Ω ; TAMB = 25°C1 8 d B ΔZAC/TEMP Temperature Variation 0.5 Ω/°C Rx Receive Test Circuit Fig. 10 ARX Receive Gain (Vol. default) LI to RO 1.5 3 4.5 dB AVOL Volume Gain VOL key +5.4 dBr AVOL Volume Gain –/+ keys -5.4/+8.1 dBr ΔARX/F Variation with Frequency f = 500 Hz to 3.4 kHz ±0.8 dB THD Distortion V RI ≤ 0.25VRMS 2% VAGC Soft Clip Level V RO =1 V PEAK ASCO Soft Clip Overdrive 10 dB tATTACT Attact Time V RI > 0.8VRMS 30 µs/6 dB tDECAY Decay Time 20 ms/6dB VNO Noise Output Voltage T AMB = 25°C -72 dBmp ZIN Input Impedance (RI) 8 k Ω VIN RI Input Voltage Range (RI) ±2 V PEAK AST Sidetone Cancellation V RI ≤ 0.25VRMS 26 dB VIN ST Input Voltage Range (STB) ±2 V PEAK ZIN Input Impedance (STB) 80 k Ω Symbol Parameter Conditions Min Typ Max Units

21Rev. 7 July 1998 Data Sheet AS2533...6 AC Characteristics (cont´d) (ILINE = 15 mA; f = 800 Hz unless otherwise specified) Symbol Parameter Conditions Min Typ Max Units Keyboard tD Key Debounce Time 15 ms HS/DPN Input t HS-L Low to High Debounce Going off-hook 15 ms tHS-H High to Low Debounce Not LD dialling 210 ms During LD dialling 270 ms DTMF F Frequency deviation Note 5 1.2 % VMF MF Tone Level (Low group) MFL = AGND - 2.5 - 4 - 5.5 dB MFL = VSS - 14.5 - 16 - 17.5 dB ΔVL-H Preemphasis Low to High 1.8 2.4 3.0 dB VUFC Unwanted F. Componets 300 Hz...5 kHz -40 dBm Note 3; MFL = V SS 5 kHz...14 kHz -50 dBm 14 kHz...28.5 kHz -70 dBm 28.5 kHz...40 kHz -80 dBm t TD Tone Duration Note 1&6; Mode=row 6 or 7 80 82.3 85 ms tITP Inter Tone Pause Note1; Mode=row 6 80 82.3 85 ms tITP Inter Tone Pause Note 1 & 6; Mode=row 7 150 165 170 ms tTR Tone Rise Time Note 2 5 ms tTF Tone Fall Time Note 2 5 ms LD t DR Dial Rate Mode = row 1, 2 or 5 9.53 10 10.5 pps Mode = row 3 or 4 19.05 20 21 pps t/B Break Period Mode = row 2 57 61.2 63 ms t/B Break Period Mode = row 4 28.5 30.6 31.5 ms t/B Break Period Mode = row 1 or 5 63 66 69 ms t/B Break Period Mode = row 3 31.5 33 34.5 ms tM/ Make Period Mode = row 2 38 40.8 42 ms tM/ Make Period Mode = row 4 19 20.4 21 ms tM/ Make Period Mode = row 1 or 5 31.5 33 34.5 ms tM/ Make Period Mode = row 3 15.7 16.5 17.3 ms tPDP Pre-Digit Pause 35 ms tIDP Inter Digit Pause Mode = row 1, 2, 3, 4 or 5 800 840 880 ms tHS-H High to Low Debounce During LD dialling 270 ms tMO Mute Overhang t M

22Rev. 7 July 1998 Data Sheet AS2533...6 Symbol Parameter Conditions Min Typ Max Units tFD Flash Duration 1 R1 key 100 102 ms Flash Duration 2 R2 key 270 300 ms Flash Duration 3 R3 key (AS2533/4B/5/6) 600 650 ms R3 key (AS2534E only) 312 375 450 ms tPFP Post Flash Pause 274 ms tAP Access Pause Note 8 2.0 2.05 2.12 sec tRP Repeat Break Time 1.6 sec Tone Ringer V MO Melody Output PDM tMD Melody Delay 10 ms F1 Frequency 1 800 Hz F2 Frequency 2 1067 Hz F3 Frequency 3 1333 Hz t DT Detection Time Initial 1/f + 73ms s tTO Detection Time-out note 4 ms fMIN Min. Detection Frequency 13 Hz fMAX Max. Detection Frequency 70 Hz Pacifier Tone Programme Mode Only f PT Frequency P/M mode, key entry 1477 Hz VRT Level (RO) Key entry 60 mV tRTD-E Duration, Key Entry Valid key entry, prog. 40 ms tRTD-A Duration, Acknowledge Terminate with P/M key 140 ms tRTD-R Duration, Reject Invalid key entry, note 7 4x40 ms LED Output t LED-ON "on-time" P/M state 80 ms tLED-OFF Interval P/M state 1 sec Comfort Tone (DTMF) V CT Level (RO) Relative to LS -30 dBr Note 1: The values are valid during automatic dialling and are minimum values during manual dialling, i.e. the tones will continue as long as the key is depressed. Note 2: The rise time is the time from 10% of final value till the tone amplitude has reached 90 % of its final value. Note 3: Relative to high group. Note 4: The FCI circuit is reset by POR and HS/DPN pulled high (off-hook). After a reset the FCI circuit is in a standby state. A positive edge on FCI will start a 73 ms timer and the frequency discrimination is initiated. Whenever a period of the ring signal is missing, the timer is reset. When a valid ring signal is present for 73 ms, the melody generator is started and is directly controlled by the ring signal. This condition will remain until a new reset. Note 5: This does not include the frequency deviation of the ceramic resonator. Note 6: During temporary MF mode. Note 7: An invalid key entry in programme mode will invoke a tone sequence with 4 tone bursts of 40 ms and pauses between bursts of 28 ms and abort the programme mode. Note 8: Pauses inserted within the first 5 entries of a digit string will be automatically terminated after 2 seconds. Pauses inserted after location 5 can only be terminated manually by pressing the PS or LNR key.

23Rev. 7 July 1998 Data Sheet AS2533...6 Test Circuit Figure 10 5V6 100 m LS RI STB LI CS Vss MFL FCI21 RO LED

10 HS/DP

3.58 MHz

150 WILINE

B U L 600 W A 100 m AS253x 100 m 10 n

24Rev. 7 July 1998 Data Sheet AS2533...6 Fig. 11 Receive Soft Clipping and Distortion Fig. 12 Transmit Soft Clipping and Distortion 1009080706050403020100 8(V) VLS VLI (mA)Line Current Typically No ac signals Tamb: 25°C Fig. 13 DC Mask Characteristic Curves (Typical) 2,001,751,501,251,000,750,500,250,00 0,0 0,2 0,4 0,6 0,8 1,0 1,2 Line Input Voltage (LS) Receive Output Voltage (RO) Distortion (Vp) (%) (Vp) Line Current: 20 mA Frequency: 800 Hz Tamb: 25°C Typically soft clipping VRO THD 1501251007550250 0,0 0,5 1,0 1,5 2,0 2,5 Microphone Input Voltage (M1/M2) Line Output Voltage (LS) Distortion (Vp) (mVp) VLS THD Line Current: 20 mA Frequency Tamb: 25°C Typically soft clipping (%)

25Rev. 7 July 1998 Data Sheet AS2533...6 Pin Configuratio n

28 Pin SOIC (suffix T)

28 Pin DIP (suffix P)

Devic e Packag e Memorie s Volum e Centre x Special keys AS2533 T 28 pin SOIC 4 direct/10 indirect yes, note 1 A B C D P/M, LNR, R1-3, MR, RP, PS, T/P AS2533 P 28 pin DIP 4 direct/10 indirect yes, note 1 A B C D P/M, LNR, R1-3, MR, RP, PS, T/P AS2534B T 28 pin SOIC none yes, note 2 A B C D P/M, LNR, R1-3, RP, PS, T/P AS2534B P 28 pin DIP none yes, note 2 A B C D P/M, LNR, R1-3, RP, PS, T/P AS2534E P 28 pin DIP none yes, note 2 A B C D MT, LNR, R1-3, RP, PS, T/P AS2534E T 28 pin SOIC none yes, note 2 A B C D MT, LNR, R1-3, RP, PS, T/P AS2535 T 28 pin SOIC 12 direct yes, note 1 no P/M, LNR, R1-3 AS2535 P 28 pin DIP 12 direct yes, note 1 no P/M, LNR, R1-3 AS2536 T 28 pin SOIC 4 direct/10 indirect yes, note 2 A B C D P/M, LNR, R1-3, MR, RP, PS, T/P AS2536 P 28 pin DIP 4 direct/10 indirect yes, note 2 A B C D P/M, LNR, R1-3, MR, RP, PS, T/P Conditions for delivery as dice see also data sheet AS2533/4B/5/6-CX. Note 1: volume is reset to default by on-/off-hook and by POR Note 2: volume is reset by POR only.