SA58641DK datasheet(2/17 Pages) PHILIPS

Part #	SA58641DK

Description	High performance mixer FM IF system with high-speed RSSI

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Philips Semiconductors

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SA58641

High performance mixer FM IF system

with high-speed RSSI

2

2004 Dec 16

DESCRIPTION

The SA58641 is a high performance monolithic FM IF system with

high-speed RSSI incorporating a mixer/oscillator, two limiting

intermediate frequency amplifiers, quadrature detector, logarithmic

received signal strength indicator (RSSI), voltage regulator,

wideband data output and fast RSSI op amps. The SA58641 is

available in 20-lead SSOP (shrink small outline package).

The SA58641 was designed for high bandwidth portable

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

section is similar to the famous SA605. The data output has a

minimum bandwidth of 600 kHz. This is designed to demodulate

wideband data. The RSSI output is amplified. The RSSI output has

access to the feedback pin. This enables the designer to adjust the

level of the outputs or add filtering.

SA58641 incorporates a power-down mode which powers down the

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

TTL compatible with high input impedance.

FEATURES

• Wideband data output (600 kHz min.)

• Fast RSSI rise and fall times

• Low power consumption: 7.5 mA typ. at 5 V

• Mixer input to >500 MHz

• Mixer noise figure of 12 dB at 240 MHz

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

oscillator can be injected)

• 92 dB of IF Amp/Limiter gain

• 25 MHz limiter small signal bandwidth

• Temperature compensated logarithmic Received Signal Strength

Indicator (RSSI) with a dynamic range in excess of 90 dB

• RSSI output internal op amp

• Internal op amps with rail-to-rail outputs

• Low external component count; suitable for crystal/ceramic/LC

filters

• Excellent sensitivity: 0.54 µV into 50 Ω matching network for

12 dB SINAD (Signal to Noise and Distortion ratio) for 1 kHz tone

with RF at 240 MHz and IF at 10.7 MHz

• ESD hardened

• 10.7 MHz filter matching (330 Ω)

• Power-down mode (I

CC = 200 µA)

PIN CONFIGURATION

RFIN

RF BYPASS

RSSIOUT

MIXER OUT

IF AMP IN

IF AMP OUT

GND

LIMITER IN

LIMITER OUT

DK Package

POWER DOWN CONTROL

DATA OUT

QUADRATURE IN

IF AMP DECOUPLING

LIMITER DECOUPLING

VCC

RSSI FEEDBACK

XTAL OSC

(EMITTER)

XTAL OSC

(BASE)

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

SR00491

Figure 1.

Pin configuration

APPLICATIONS

• DECT (Digital European Cordless Telephone)

• Digital cordless telephones

• Digital cellular telephones

• Portable high performance communications receivers

• Single conversion VHF/UHF receivers

• FSK and ASK data receivers

• Wireless LANs

ORDERING INFORMATION

DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

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

–40

°C to +85 °C

SA58641DK

SOT266–1

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