UPD9930 datasheet(2/78 Pages) NEC

2 / 78 page

RESETB

REQB

FSYNC

SCLK

(256 kHz)

SEN

DSPSEL

MCLK

MSTR

MDAT

DCLK

TC1

TC2

DRSTB

DAI

(GSM11. 10)

Low-current drive LED

MICRO-

CONTROLLER

INTERFACE

DSP

INTERFACE

Receive

LPF

Voice send

Digital

Gain Cont.

0 to –2.8 dB

(0.4 dB steps)

Transmit

BPF

PLL

Digital signal processor

D/A

A/D

Pre-Filter

+ Mixer

0 or –3 dB

Vref

Vcombuff

RACOMO

RACOMI

XACOMI

XACOMO

REC2O+

REC2O–

ref

–

Receiver drive amplifier

(Receiver amplifier 2)

REC2I–

REC1O

Post Filter 1

(Accessory output

amplifier)

0 dB fix

Post Filter 2

(Receiver amplifier 1)

0 to -31 dB

(1 dB steps)

to Vref

RAUXO

XAUXI–

XAUXO

(to XACOMO)

MICI+

MICI–

MICO

MIXI

Microphone

amplifier

–

Sign code

output

(15 to 33 dB)

(0 to 10 dB)

to V

ref

to V

Voice receive

Digital

Gain Cont.

0 to –2.4 dB

(0.8 dB steps)

Tone

Gain Cont.

0 to –30 dB

(1 dB steps)

–38.5 dB

Tone

Generator

Tone Interval

Generation

(8 kHz)

Accessory input

amplifier

UPD9930 데이터시트(PDF) 2 Page - NEC

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