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CXA1744AR

IF Amplifier for Digital Cordless Telephone

Sony Semiconductor 

CXA1744AR

Pin

No.

Symbol

Typical pin

voltage

19

VCC

3.0V

20 REGOUT1 1.25V

Equivalent circuit

129

20

VCC

1.25V

GND

Description

Power supply for circuits other than the

MIX, OSC, MULTI, and RSSI circuits.

Internal bias regulator output.

A stabilized bias voltage can be

obtained.

21 RSSIOUT

—

129

21

RSSIVCC

RSSI current output.

A voltage output is obtained when a

resistor is connected between this pin

and GND.

22 RSSIOST 1.25V

23

QDIN

2.45V

129

22

32k

23

129

GND

RSSIVCC

1.9V

RSSI offset adjustment.

The offset amount of RSSI output

current can be adjusted by connecting

a resistor between this pin and GND.

RSSIVCC

Detector input.

Connect a detection discriminator.

24 LIMOUT

1.55V

GND

RSSIVCC

Limiter output.

24

25 RSSIGND

0V

GND

GND for the IF amplifier, limiter and

RSSI circuits.

—5—

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