UPD9930G-22 Ver la hoja de datos (PDF) - NEC => Renesas Technology

Número de pieza

componentes Descripción

Fabricante

UPD9930G-22

LINEAR CODEC FOR DIGITAL CELLULAR TELEPHONE

NEC => Renesas Technology 

µPD9930

Table 1-1 List of Pin Functions (2/2)

Pin No.

25

26

27

28

29

30

31

32

33

Pin Name

XAUXI–

XACOMI

XACOMO

RACOMO

RACOMI

REC2O+

REC2O–

IC

REC2I–

Input/Output

Input

Input

Output

Output

Input

Output

Output

—

Input

34

REC1O

Output

35

RAUXO

Output

36

AVDD1

—

37

AVDD2

—

38

DVDD

—

39

SEN

Output

40

SI

Input

41

SO

Output

42

SCLK

Output

43

TEST

Input

44

MSTR

Input

Function

Accessory input amplifier inverted input

Voice send internal reference voltage input

Voice send internal reference voltage (1.2 V) output

Voice receive internal reference voltage (1.2 V) output

Voice receive internal reference voltage input

Receiver amplifier 2 non-inverted output

Receiver amplifier 2 inverted output

Internal connection; leave unconnected

Receiver amplifier 2 inverted input

Connect sidetone gain adjust resistor.

Receiver amplifier 1 output

Accessory output amplifier output

Analog power. Connect to an analog power supply line near µPD9930 pins.

Digital power. Connect to a digital power supply line near µPD9930 pins.

DSP interface enable signal output

DSP interface serial input

DSP interface serial output

DSP interface clock output (256 kHz)

Set at high level

Microcontroller interface strobe signal input

Caution Short-circuit the XACOMI and XACOMO pins at a location as close to the pins of the µPD9930 as

possible. Connect a capacitor (chip capacitor or electrolytic capacitor) between this short-circuited

portion and analog ground.

The same applies to the RACOMI and RACOMO pins.

The transmission/reception level is determined by these reference pins. Therefore, make sure that

these pins are not affected by noise or fluctuation of ground potential due to current.

7

Share Link: