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SSRX3930

Pin Descriptions

Number

Name

I/O

Description

1

VCC1

POWER

Supply DC bias for RF amplifier

2

RXIN

I

RF amplifier input

3

VSS1

GND

Ground for RF amplifier

4

LNAOUT

O

LNA output

5

VSS2

GND

Ground for 40dB IF limiting amplifier

6

MIXIN

I

RF input to RF Mixer

7

VSS3

GND

Ground for RF Mixer

8

MIXOUT

O

IF output from RF Mixer

9

IFIN

I

IF input (required 10nF DC blocking capacitor)

10

IFIN

I

Same as pin 9 except non-inverting node amplifier input

11

IF1DEC

I/O

DC feedback for 40dB limiting amplifier (required 100nF bypass capacitor)

12

IF1DEC

I/O

See pin 11

13

IF1OUT

O

IF output from the 40 dB limiting amplifier

14

VREFIF

O

DC voltage reference for the IF limiting amplifier (required 0.1

µF capacitor)

15

VSS5

GND

Ground for 60dB IF limiting amplifier

16

IF2 IN

I

Inverting input to the 60dB limiting amplifier (required 10nF DC blocking

capacitor)

17

IF2DEC

I/O

DC feedback node for the 60dB limiting amplifier (required 100nF bypass

capacitor)

18

IF2DEC

I/O

See pin 17

19

VCC3

POWER

Supply DC bias to the 60dB IF limiting amplifier

20

MUTE

I

Select FM, FSK, or mute at the FM OUT pin. (to Ground: FSK OUTPUT;

floating: FM OUTPUT; to Vcc: muting)

21

RSSI

O

Proportional DC voltage (0.5V~2.5V) output

22

FMOUT

O

Demodulated output

23

IF2OUT

O

IF output from the 60dB limiting strip

24

QUAD

I

FM demodulator input (not AC coupled)

25

RES

I/O

Supply DC voltage to VCO

26

RES

I/O

See pin 25

27

VCC2

POWER

Supply DC bias to the VCO, prescaler, and PLL

28

VSS4

GND

Ground shared by the VCO, prescaler, and PLL

29

DO

I/O

Output of the charge pump, and input to the VCO

Rev.2.01 6/26/2003