AN6425

AN6425K PANASONIC | Alldatasheet

Document overview

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Technical content

The AN6425K is a high-function speech network IC with speaker amplifier. It incorporates a transmitter-system non-lin- ear circuit, receiver digital VRs, etc. and is suitable for realiz- ing the multifunctional telephone sets. n Features

• Speech network IC for the multifunctional telephone sets
• Capable of interfacing with the light-weight small receivers and ECM transmitters
• Built-in 2V REG constant voltage source (2V typ) for ECM
• Built-in non-linear circuits in the transmitter and receiver systems in order to eliminate ambient noises
• Built-in speaker amplifier and capable of driving with a main wire current
• Built-in hold-tone amplifier, key-in-tone amplifier, and DTMF transmitter, and capable of setting the mode with the control pins
• Automatic gain control (automatic pad function) according to a circuit curret
• Built-in tertiary active filter circuit and capable of sending a DTMF circuit with much higher harmonic at a low distortion factor
• Built-in single touch receiver volume-up function (about 6dB) AN6425K Speech Network Circuit Unit : mm 26.7–0.3 0.5–0.1 3 to 15˚ 8.4–0.3 0.9–0.251.778 4.8–0.25 28-pin Shrunk DIL Plastic Package (SDIP028-P-0400B) 3.05–0.25 10.16–0.25 0.3 +0.1 – 0.05 1.05–0.25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 TT in HT KT 40kΩ 80kΩ MIC in Filter Amp.SEND Amp MUTE Logic INV NAND DVR 4kΩ 65kΩ 30kΩ 2kΩ2kΩ1V 30kΩ CLASS B BTL CLASS A Push pull + REC inD6dB D5dB D3dB D3dB D12 dB GND VL VL 2V REG 1V REFF Battery Selector REC DRIVER REC DRIVER SP Amp. n Block Diagram

O perating am bient tem perature Storage tem perature V m A m W Param eter Sym bol R ating U nit n A bsolute M axim um R atings (Ta=25˚C ) 14.4 * 120 * 1200 * –20 to + 65 –55 to +150 * V C C × IC C <1200m W Param eter Sym bol R ange n R ecom m ended O perating R ange (Ta=25˚C ) O perating supply voltage range V L 3 to 12V Param eter Sym bol C ondition m in typ m ax n Electrical C haracteristics (Ta=25˚C ) G V (R EC ) O pen betw een the Pins19 and 20. M easure the output betw een the Pins22 and 23 w hen a sign- al (–55dB m ) is input to the Pin18. R eceiver distortion factor TH D (R EC ) %1 O pen betw een the Pins19 and 20. M easure the out- put distortion factor betw een the Pins 22 and 23 w hen a signal (–55dB m ) is input to the Pin18. R eceiver m axim um output voltage V O (R EC ) dB m+3 D A utom atic pad A P (R EC ) dB Input a signal (–45dB m ) to the Pin18 and m ea- sure an output change betw een the Pins22 and 23 w hen IL changes from 80m A to 30m A . M U TE (R EC ) Input a signal (–45dB m ) to the Pin18 and m easure an output change betw een the Pins 22 and 23 w hen the Pin12 changes from no m icrophone input signal to –40dB m . dB Input a signal (–45dB m ) to the Pin18 and m easure an output change betw een the Pins 22 and 23 w hen the Pin12 is set from H to L. R eceiver D digital V R D V R dB m–50M easure the output betw een the Pins22 and 23 w hen there is no signal at the Pin18. R eceiver noise output V no (R EC ) dB42.5 O pen bitw een the Pins3 and 6. M easure the output betw een the Pins28 and 1 w hen a signal (–45dB m ) is input to the Pin12. Transm itter gain G V (SEN D ) %Transm itter distortion factor TH D (SEN D ) dB m5 O pen betw een the Pins3 and 6. M easure the output distortion factor betw een the Pins28 and 1 w hen a signal (–45dB m ) is input to the Pin12. Transm itter m axim um transm ission level V O (SEN D ) dB–3 –1.5 –60 29.5 –1.5 –45 R eceiver gain 53 dB50.548 D R eceiver noise prevention dB–5 –3–7 Transm itter D autom atic pad A P (SEN D ) Input a signal (–35dB m ) to the Pin12 and m easure an output change betw een the Pins 28 and 1 w hen IL changes from 80m A . dB m–65M easure the output betw een the Pins28 and 1 w hen there is no signal at the Pin18.Transm itter noise prevention V no (SEN D ) dB26.5H O LD TO N E gain G V (H O LD ) dB41.5 G round the Pin24. Input a signal (–30dB m ) to the Pin17 and m easure the output change betw een the Pins 28 and 1. TO U C H TO N E gain G V (TO U C H ) G round a signal (–45dB m ) to the Pin16 and m easure the out- put betw een the Pins28 and 1. 1.5 23.5 TO U C H TO N E distortion factor TH D (TO U C H ) G round the Pin14. Input a signal (–45dB m ) to the Pin16 and m easure the output distor- tion factor betw een the Pins 28 and 1. U nit Input a signal to the Pin18 and m easure the output betw een the Pins22 and 23 at an output distortion factor of 5% . Input a signal to the Pin12 and m easure the output betw een the Pins28 and 1 at an output distortion factor of 5% . * IL=30m A and Freq=1kH z unless otherw ise specified.

Param eter Sym bol C ondition m in typ m ax n Electrical C haracteristics (cont.) (Ta=25˚C ) dB–3 –1.5–6TO U C H TO N E D autom atic pad A P (TO U C H ) G round the Pin14. Input a signal (–45 dB m ) to the Pin16 and m easure an out- put change betw een the Pins 28 and 1 w hen IL changes from 80m A to 30m A . dB5045SP am plifier gain G V (SP) G round the Pin15. Input a signal (–50dB m ) to the Pin24 and m easure the output betw een the Pins 25 and 26. %10SP distortion factor TH D (SP) G round the Pin15. Input a signal (–50dB m ) to the Pin24 and m easure the output distor- tion factor betw een the Pins 25 and 26. U nit * IL=30m A and Freq=1kH z unless otherw ise specified. n Pin D escriptions G N D 2V R EG 1V R EF B T 1/2V L G round pin. C onnect to the output of the diode bridge. 2V internal stabillized pow er supply output pin. C onnect to G N D via 220µF. The current obtainable from this pin is 5m A or less (at IL=20m A ). 1V reference coltage output pin. C onnect to G N D via 47µF. N o current is allow ed to be input/output from this pin. External battery connection pin. C onnect the 3 to 6V battery to G N D . C onnect to G N D directly w hen the B T function is not used. Transm itter output. Transm itter gain control pin. C ontrols the gain and frequency charac- teristic of the transm itter system w ith external C and R . A utom atic pad control pin. C apable of controlling the pad operating point w ith the external resistor. Typical w aveform D escription Equivalent circuitPin N o. Pin nam e SEN D O U TPU T SEN D D R IV ER D C 0V D C 2V D C 1V D C 0.3V D C 0 to 6V (Supplied from O utside) 5/7 × V L V ref R EG2 V C C 10kΩ1V V C C V LV ref 65.3kΩ V L 20kΩ 47kΩ

n Pin D escriptions (cont.) M ute LPF (1) LPF (2) LPF (3) M IC input H C D M C SPC TT input M icrophone input pin. Input pin for the m icrophone. H O LD TO N E control pin. T he H O LD TO N E transm ission m ode is set by setting this pin to Low . D IA L M U TE control pin. T he D TM F transm ission m ode is set by setting this pin to Low . SPEA K ER control pin. T he speaker m ode is set by setting this pin to Low . D TM T signal input pin. Inputs a D TM F signal. A signal is sent to the circuit w hen the Pin14 is at Low . Typical w aveform D escription Equivalent circuitPin N o. Pin nam e H ole Tone M ode D TM F Transm ission M ode Speaker M ode V C C V C C 10kΩ V C C V C C 10kΩ V C C V C C 10kΩ V C C V C C 10kΩ V C C V ref 10kΩ Transm itter filter pin. Constitutes the tertiary active filter w ith the external parts C and R , and capable of controlling the high-pass transm itter fre- quency characteristic. N oise precentice peak hold pin. C onnect to G N D via 10µF. D C W /o External C apafitor W /External C apafitor V C CV C C V C C V C C V C C 40kΩ

R eceiver signal input pin. Inputs a receiver signal from the side tone preventive circuit netw ork. R eceiver gain control pin, R eceiver signal output pin. C apable of controlling the frequency characteristic and gain of the receiver system w ith the external parts C and F of the Pins19 and 20. The receiver sig- nal/H O LD TO N E signal/K EY IN TO N E signal is output to the Pin20 by the H C /D M C /SPC control. R eceiver am plifier signal input pin, R eceiver output (1) pin, R eceiver output (2) pin. Inputs a receiver signal from the Pin20 to the Pin21. B TL output at the Pins20 and 23. Speaker am plifier signal input pin. Inputs a receiver signal from the Pin20. Pin N o. D river input D river output (1) D river output (2) V C C V ref V C C V C C V C C V C C 82kΩ 10kΩ 10kΩ V C C V ref V ref V C C V C C 2kΩ 2kΩ 2kΩ 2kΩ V C C V ref 10kΩ K T/H T signal input pin, D igital V R O N Pin. Inputs a K E Y IN T O N E or H O L D TO N E signal. If the Pin14 is set to Low , the K T signal is output to the receiver, and if the Pin13 is set to Low , the H T signal is output to the curcuit and speak- er. The receiver gain is im proved 6dB by setting this pin to Low instantaneous- ly. D igital V R O N K T/H T 4kΩ 45kΩ V C C V C C V ref 30kΩ Typical w aveform D escription Equivalent circuitPin nam e n Pin D escriptions (cont.)

n Pin D escriptions (cont.) SP out (1) SP out (2) B S V L Pow er supply boot strap pin. C onnects to the Pin28 via 47µF. The D C resistance of the com m unication cir- cuit is determ ined by connecting an external resistor to G N D . Supply current input pin. C onnects to the + output of the diode bridge. Typical w aveform D escription Equivalent circuitPin N o. Pin nam e D C 1 to 8V 3 to 10V 50Ω2kΩ V L Speaker output (1) pin, Speaker output (1) pin. O utput of the class-A differential am pli- fier and connected to the speaker through the transform er (300Ω ) w ith interm ediate tap. Param eter Sym bol C ondition m in typ m ax K EY IN TO N E gain G V (K EY ) dB40M easure the output betw een the Pin22 and 23 w hen key input (Pin17)=–40dB m . Δ Transm itter noise preventive attenuation M U TE (SEN D ) dB–14 Δ Transm itter noise preventive selector level M U TE (M IC ) dB m–62R EC output Δ –1dB Low im pedance drive R L (R EC ) dBR (R EC )=130Ω , Input=–50dB m D C resistance (1) R D C (1) V3.8W ith IL=20m A , m easure the D C voltage at the Pin28 w hen connecting 6.2kΩ betw een the Pins27 and 1. VW ith IL=100m A , m easure the D C voltage at the Pin28 w hen connecting 6.2kΩ betw een the Pins27 and 1.D C resistance (2) R D C (2) kΩ2M easure the A C im pedance betw een the Pins28 and 1 at IL=20m A . N ote) The above characteristics are design reference values and not guaranteed values. A C im pedance (1) ZA C (1) kΩ1.5M easure the A C im pedance betw een the Pins28 and 1 at IL=100m A .A C im pedance (2) ZA C (2) VInternal regulator voltage V R EG M easure the D C voltage at the Pin2 at IL=30m A . Internal reference voltage V R EF M easure the D C voltage at the Pin3 at IL=20m A . To the Pin8 – G N D U nit n Supplem entary D escriptions

• Electrical C haracteristics D esign R eference V alues (Ta=25˚C )

C ircuit C urrent IL (m A ) C ircuit V oltage V L (V ) V L– IL –8–90 M icrophone Input V in (M IC ) (dB m ) R eceiver O utput V out (R EC ) (dB ) R eceiver M ute V L V out (R EC ) V out (R EC ) V out (M IC ) V out (SP) TH D (SP) V out (TT) 20 40 60 80 100 120 0 0 C ircuit C urrent IL (m A ) A C Im pedance ZA C (kΩ ) C haracterristic Im pedance 20 40 60 80 100 120 –10 –12 –14 –16 –18 0 C ircuit C urrent IL (m A ) C ircuit O utput V out (TT) (dB m ) M icrophone A utom atic Pad C haracteristics 20 40 60 80 100 120 –10 0 C ircuit C urrent IL (m A ) C ircuit O utput V out (TT) (dB m ) TT (D TM F) A utom atic Pad C haracteristics 20 40 60 80 100 120 –10 –20 –30 –40 –50 –60–80 Touch Tone Input V in (TT) (dB m ) C ircuit O utput V out (M IC ) (dB m ) TT I/O C haracteristics +20 +10 –10 –20 –30 –40 –50 –60 –80 SP Input V in (SP) (dB m ) Speaker O utput V out (SP) (dB m ) Total H arm onic D istortion TH D (SP) (% ) Speaker I/O C haracteristics +20 +10 –10 –20 –30 –40 –50 –60–80 M icrophone Input V in (M IC ) (dB m ) C ircuit O utput V out (M IC ) (dB m ) Transm itter I/O C haracteristics –10 0 C ircuit C urrent IL (m A ) R eceiver O utput V out (R EC ) (dB m ) R eceiver A utom atic Pad C haracteristics 20 40 60 80 100 120 6.2kΩ 820Ω 33µF 820Ω 33µF 33µF LF Im oedance A nalyzer (f=1kH z) 33µF IC 6 3 22kΩ R EC IN =C onstant 0.001µF 6 3 M ic. Input=–40dB m 22kΩ 6 3 TT Input=–40dB m 22kΩ R EC IN =–55dB m IL=30m A fin=1kH z IL=30m A fin=1kH z IL=30m A fin=1khz 6 3 V out (M IC ) 22kΩ 6 3 22kΩ 6 3 O pen 6 3 O pen C losed C ircuit C haracteristics n Characteristics Curve

+ + + + 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 A N 6425K 8 9 10 11 12 13 14 + + 6.8kΩ 8.2kΩ SP SP A G C circuit 10µF/16V 47µF/16V 470µF/6.3V 47µF/16V 10µF/16V 10µF/16V 0.022µF 0.01µF 47µF/ 16V 47µF/ 16V 2.2µF/ 50V 100kΩ 33kΩ 33kΩ 10kΩ 33Ω 0.47µF 0.0015µF 0.068µF 0.033µF 0.0022µF 0.0082µF 0.15 µF 0.033µF 0.01µF 2.2kΩ2.2kΩ 1kΩ 2.7kΩ 6.2kΩ 12kΩ 6.8kΩ 10kΩ 100kB 1kΩ 1kΩ 47µF/16V 0.068µF 0.22µF 0.22µF 0.1µF 0.01µF 0.01µF 0.001µF 10µF/16V SP Stablized Pow er Supply B alancing N etw ork 68kΩ 2.2kΩ 10kΩ EC M D M CH C 2.2kΩ1kΩ 330Ω 4.7kΩ 47µF/16V 47µF/16V 0.022µF 1.8kΩ 3.3kΩ 47kΩ M F SPC V R 1 Piezo-electric R eceiver 0.0047µF 0.01µF n Application Circuit