SA676

Philips Semiconductors Product specification Low-voltage mixer FM IF system SA676 DESCRIPTION The SA676 is a low-voltage monolithic FM IF system incorporating a mixer/oscillator, two limiting intermediate frequency amplifiers, quadrature detector, logarithmic received signal strength indicator (RSSI), voltage regulator and audio and RSSI op amps. The SA676 is available in a 20-pin SSOP (shrink small outline package). The SA676 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. PIN CONFIGURATION DK Package RF IN+ 1 RF IN– DECOUPLING 2 OSCOUT 3 OSCIN 4 RSSI OUT 5 VCC 6 AUDIO FEEDBACK 7 AUDIO OUT 8 RSSI FEEDBACK 9 QUADRATURE IN 10 20 MIXER OUT 19 IF AMP DECOUPLING 18 IF AMP IN 17 IF AMP DECOUPLING 16 IF AMP OUT 15 GND 14 LIMITER IN 13 LIMITER DECOUPLING 12 LIMITER DECOUPLING 11 LIMITER OUT FEATURES Low power consumption: 3.5mA typical at 3V Mixer input to >100MHz Mixer conversion power gain of 17dB at 45MHz XTAL oscillator effective to 100MHz (L.C. oscillator or external oscillator can be used at higher frequencies) SR00514 Figure 1. Pin Configuration 102dB of IF Amp/Limiter g...