Philips Semiconductors

Product specification

SA647

Low-voltage digital IF receiver

2

1998 Aug 10

853–2037 19849

DESCRIPTION

The SA647 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 SA647 is

available in TSSOP (thin shrink small outline package).

The SA647 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

APPLICATIONS

PIN CONFIGURATION

SR01456

GND

LIM OUT (+)

RFIN+

RFIN–

OSC E

OSC B

RSSI

RSSI FB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

20

19

18

17

16

15

LIM OUT (-)

VCC

Figure 1.

Pin Configuration

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

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

–40 to +85

°C

SA647DH

SOT360–1

SR01727

OSCILLATOR

MIXER

+–

IF

AMP

20

19

18

17

16

15

14

13

12

11

12

3

4

56

7

8

9

10

EB

LIMITER

VCC

GND

FAST RSSI

+–

POWER

DOWN

Figure 2.

Block Diagram