SA639 データシートの表示（PDF） - Philips Electronics

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SA639

Low voltage mixer FM IF system with filter amplifier and data switch

Philips Electronics 

Philips Semiconductors

Low voltage mixer FM IF system with filter amplifier

and data switch

Product specification

SA639

DESCRIPTION

The SA639 is a low-voltage high performance monolithic FM IF

system with high-speed RSSI incorporating a mixer/oscillator, two

wideband limiting intermediate frequency amplifiers, quadrature

detector, logarithmic received signal strength indicator (RSSI), fast

RSSI op amps, voltage regulator, wideband data output, post

detection filter amplifier and data switch. The SA639 is available in

24-lead TSSOP (Thin shrink small outline package).

The SA639 was designed for high bandwidth portable

communication applications and will function down to 2.7V. The RF

section is similar to the famous NE605. The data output provides a

minimum bandwidth of 1MHz to demodulate wideband data. The

RSSI output is amplified and has access to the feedback pin. This

enables the designer to level adjust the outputs or add filtering.

The post-detection amplifier may be used to realize a low pass filter

function. A programmable data switch routes a portion of the data

signal to an external integration circuit that generates a data

comparator reference voltage.

SA639 incorporates a power down mode which powers down the

device when Pin 8 is high. Power down logic levels are CMOS and

TTL compatible with high input impedance.

APPLICATIONS

• DECT (Digital European Cordless Telephone)

• FSK and ASK data receivers

FEATURES

• VCC = 2.7 to 5.5V

• Low power consumption: 8.6mA typ at 3V

• Wideband data output (1MHz min.)

• Fast RSSI rise and fall times

• Mixer input to >500MHz

• Mixer conversion power gain of 9.2dB and noise figure of 11dB at

110MHz

ORDERING INFORMATION

DESCRIPTION

24-Pin Plastic TSSOP (Thin Shrink Small Outline Package)

PIN CONFIGURATION

RFIN 1

RF BYPASS 2

XTAL OSC (EMITTER) 3

XTAL OSC (BASE) 4

VCC 5

RSSI FEEDBACK 6

RSSI OUT 7

POWER DOWN CONTROL 8

DATA OUT 9

POSTAMP IN 10

POSTAMP OUT 11

SWITCH CONTROL 12

24 MIXER OUT

23 IF AMP DECOUPLING

22 IF AMP IN

21 IF AMP DECOUPLING

20 IF AMP OUT

19 GND

18 LIMITER IN

17 LIMITER DECOUPLING

16 LIMITER DECOUPLING

15 LIMITER OUT

14 QUADRATURE IN

13 SWITCH OUT

Figure 1. Pin Configuration

SR00030

• XTAL oscillator effective to 150MHz (L.C. oscillator to 1GHz local

oscillator can be injected)

• 92dB of IF Amp/Limiter power gain

• 25MHz limiter small signal bandwidth

• Temperature compensated logarithmic Received Signal Strength

Indicator (RSSI) with a dynamic range in excess of 80dB

• RSSI output internal op amp

• Post detection amplifier for filtering

• Programmable data switch

• Excellent sensitivity: 2.24µV into 50Ω matching network for 10dB

SNR (Signal to Noise Ratio) with RF at 110MHz and IF at 9.8MHz

• ESD hardened

• Power down mode

TEMPERATURE RANGE ORDER CODE

-40 to +85°C

SA639DH

DWG #

SOT-355

1998 Feb 10

2

853-1792 18944

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