CXA1999 Просмотр технического описания (PDF) - Sony Semiconductor

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CXA1999

IF Amplifier for M-ary FSK Pagers

Sony Semiconductor 

CXA1999N

Pin Description

Pin

Symbol

No.

1

OSC IN

Pin voltage

1.4 V

2

OSC OUT

0.7 V

3

MIX OUT

1.2 V

4

VCC

5

IF IN

1.4 V

Equivalent circuit

VCC

15k

300

1

72

15k

2

230

GND

VCC

1.5k

3

Description

Connects the external parts of

crystal oscillator circuit.

A capacitor and crystal oscillator

are connected to these pins and

VCC.

Mixer output.

Connect a 455 kHz ceramic filter

between this pin and IF IN.

GND

1.5k

8k 8k

VCC

1.5k

Power supply.

5

IF limiter amplifier input.

6

B.S.

—

7

FSK REF

0.2 V

72

6

40k

140k

72

7

GND

GND

VCC

Controls the battery saving.

Setting this pin low suspends the

operation of IC.

(Applied voltage range: –0.5 V to

+7.0 V)

Connects the capacitor that

determines the low cut-off

frequency for the entire system.

GND

—3—

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