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CXA1744AR

IF Amplifier for Digital Cordless Telephone

Sony Semiconductor 

CXA1744AR

Pin

No.

Symbol

Typical pin

voltage

26

LIMP2

1.5V

27

LIMIN

28

LIMP1

29

IFCNT

0.6V

30 RSSIVCC 2.45V

31 IFOUT

1.55V

Equivalent circuit

RSSIVCC

50k

28

460

27

50k

26

GND

RSSIVCC

129

29

30

1.9V

GND

VCC

+

1.25V

GND

RSSIVCC

420

31

Description

Limiter input. Input the signal from IF

amplifier to LIMIN. Connect a

decoupling capacitor to LIMP1 and

LIMP2.

IF amplifier gain adjustment.

Connect a resistor between this pin

and GND to compensate for the

interstage filter insertion loss between

the IF amplifier and limiter.

Power supply for the IF amplifier,

limiter and RSSI circuits.

Connected to the regulator output

internally.

Connect a decoupling capacitor.

IF amplifier output.

32 SAMPLE

3.0V

33

IFP2

34

IFIN

1.55V

35

IFP1

36 MIXVCC

3.0V

50k

10k

32

GND

VCC

GND

RSSIVCC

50k

35

330

34

50k

33

GND

Sample-and-hold circuit control input.

Sample mode for open or High; hold

mode for Low.

IF amplifier input. Input the signal

from MIX to IFIN. Connect a

decoupling capacitor to IFP1 and

IFP2.

Power supply for the MIX, OSC, and

MULTI circuits.

—6—

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