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CXA1742Q

IF Amplifier for Analog Cellular Communications

Sony Semiconductor 

CXA1742Q

Pin No. Symbol

Pin voltage I/O

DC AC resistance

18 AGCPS 0.233 V

Equivalent circuit

Description

Connects an AGC

33

integrating capacitor.

18

VREF

19 XTALOUT

20 XTALIN 2.96 V

21

GND 0 V

22

IFIN 1.25 V

23

IFPS 1.25 V

24

VCC 3.0 V

25

GND 0 V

147

10k

20

34

15

15p

10k

Connect a crystal oscillator

24 to form a Colpitts-type

oscillator circuit.

When an external

19 oscillator is used, its signal

must be connected to Pin

20.

25

21

22

1.5k

VREF

21

Ground.

RF amplifier input. The

relationship between IFIN

24

(Pin 22) and IFPS (Pin 23)

is designed so that the IC

internal stray capacitance

23 is small.

1.5k

Therefore, if Pins 22 and

23 are used for balance

input, the common-mode

25

rejection deteriorates.

Power supply.

Supplies current to the RF

AMP, MIXER, OSC, and

1/2 DIVIDER circuits.

Ground.

—6—

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