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M65856SP

Digital Echo with Mic-mixing Circuit

Renesas Electronics 

M65856SP

Description of Pin

Pin Symbol

no.

Name

I/O Function

1

MIC SW

Mic switch

I

L: Mic off H: Mic on

2

MCLKCONT Oscillator input

— Internal clock is controlled by external resistor

3

VALC

ALC operating voltage setting

— ALC operating voltage is set by applied voltage

value

4

MIC1IN

Mic 1 input

I

Used to connect Mic 1

5

ALC1

ALC1 control

— Used to connect C for setting ALC attack and

recovery times

6

MIC1NFIN

Mic 1 negative feedback input I

Used to set the Mic 1 amplifier gain using external

resistor

7

MIC1OUT

Mic 1 output

O Mic 1 amplifier output

8

MIC1VOLIN Mic 1 volume input

I

C coupling used to reduce noise when volume is

switched

9

MIC2IN

Mic 2 input

I

Used to connect Mic 2

10 ALC2

ALC2 control

— Used to connect C for setting ALC attack and

recovery times

11 MIC2NFIN

Mic 2 negative feedback input I

Used to set the Mic 2 amplifier gain using external

resistor

12 MIC2OUT

Mic 2 output

O Mic 2 amplifier output

13 MIC2VOLIN Mic 2 volume input

I

C coupling used to reduce noise when volume is

switched

14 MICOUT

Mic output

O Mixing output of Mic 1 and Mic 2

15 LPF1IN1

Low-pass filter 1 input 1

I

Pre-filter before A/D conversion for digital echo

16 LPF1IN2

Low-pass filter 1 input 2

I

17 LPF1OUT

Low-pass filter 1 output

O

18 ADINTOUT

19 ADINTIN

A/D integrator output

A/D integrator input

O Configures an integrator for A/D conversion using

I

external C

20 ADCONT

A/D control

— Determines the constant when ADM-type A/D

conversion is applied

21 REF

Reference power supply output — Used to connect C for 1/2 Vcc output and filter

22 GND

Ground

—

23 VCC

Power supply

—

24 DACONT

D/A control

I

Determines the constant when ADM-type D/A

conversion is applied

25 DAINTIN

26 DAINTOUT

D/A integrator input

D/A integrator output

I

Configures an integrator for D/A conversion using

O external C

27 LPF2IN1

Low-pass filter 2 input 1

I

Post-filter before D/A conversion for digital echo

28 LPF2IN2

Low-pass filter 2 input 2

I

29 LPF2OUT

Low-pass filter 2 output

O

30 VOLIN

Volume input

I

C coupling used to reduce noise when volume is

switched

31 LIN

Left channel line input

I

32 RIN

Right channel line input

I

33 KEYCONIN

Monaural input supporting

external key control IC

I

Interface pin for connecting external key control IC

34 SOURCEOUT Monaural output supporting

O

external key control IC

Rev.1.0, Sep.22.2003, page 3 of 18

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