SA58640 Datasheet, PDF (1/16 Pages) NXP Semiconductors – Low-voltage mixer FM IF system

SA58640
Low-voltage mixer FM IF system
Rev. 01 — 1 November 2004
Objective data sheet
1. Introduction
The SA58640 was designed for cordless telephone applications in which efficient and
economic integrated solutions are required and yet high performance is desirable.
Although the product is not targeted to meet the stringent specifications of high
performance cellular equipment, it will exceed the needs for analog cordless phones. The
minimal amount of external components and absence of any external adjustments makes
for a very economical solution.
2. General description
The SA58640 is a low-voltage monolithic FM IF system incorporating a mixer/oscillator,
two limiting intermediate frequency amplifiers, quadrature detector, logarithmic RSSI,
voltage regulator and audio and RSSI opamps. The SA58640 is available in a 20-pin
SSOP.
3. Features
■ Low power consumption: 5.0 mA typical at 5 V
■ Mixer input to >100 MHz
■ Mixer conversion power gain of 17 dB at 45 MHz
■ XTAL oscillator effective to 100 MHz (LC oscillator or external oscillator can be used at
higher frequencies)
■ 102 dB of IF amp/limiter gain
■ 2 MHz IF amp/limiter small signal bandwidth
■ Temperature compensated logarithmic RSSI with a 70 dB dynamic range
■ Low external component count; suitable for crystal/ceramic/LC filters
■ Audio output internal opamp
■ RSSI output internal opamp
■ Internal opamps with rail-to-rail outputs
■ ESD protection: Human body model 2 kV; robot model 200 V
4. Applications
■ Cordless phones