Philips Semiconductors RF Communications Products

Product specification

SA637

Low-voltage digital IF receiver

2

October 27, 1993

853-1718 11205

DESCRIPTION

The SA637 is a low-voltage high performance

monolithic digital system with high-speed

RSSI incorporating a mixer, oscillator with

buffered output, two limiting intermediate

frequency amplifiers, fast logarithmic

received signal strength indicator (RSSI),

voltage regulator, RSSI op amp and power

down pin. The SA637 is available in SSOP

(shrink small outline package).

The SA637 was designed for portable digital

communication applications and will function

down to 2.7V. The limiter amplifier has

differential outputs with 2MHz small signal

bandwidth. The RSSI output has access to

the feedback pin. This enables the designer

to level adjust the outputs or add filtering.

FEATURES

compensation

APPLICATIONS

PIN CONFIGURATION

DK Packages

MIXER

OUTPUT

IF AMP IN

GND

LIMITER IN

LIM OUT (+)

RFIN

RFIN

OSC E

OSC B

OSC

BUFFER

RSSI

RSSI

FEEDBACK

POWER

DOWN

1

2

3

4

5

6

7

8

9

10

11

12

13

14

20

19

18

17

16

15

LIM OUT (-)

VCC

IF AMP

DECOUP

IF AMP

DECOUP

IF AMP OUT

LIMITER

DECOUP

LIMITER

DECOUP

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

20-Pin Plastic Shrink Small Outline Package (Surface-mount)

-40 to +85

°C

SA637DK

1563

BLOCK DIAGRAM

OSCILLATOR

MIXER

+

–

+ –

IF

AMP

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10

E

B

LIMITER

VCC

GND

FAST RSSI

POWER

DOWN