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.

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 operational amplifiers. The SA58640 is available in a 20-pin SSOP package.

FEATUREs and benefits
■ 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
■ Crystal oscillator effective to 100 MHz (LC oscillator or external oscillator can be used
   at higher frequencies)
■ 102 dB of IF amplifier/limiter gain
■ 2 MHz IF amplifier/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 op amp
■ RSSI output internal op amp
■ Internal op amps with rail-to-rail outputs
■ ESD protection: Human body model 2 kV; robot model 200 V

APPLICATIONs
■ Cordless telephones