SA647

INTEGRATED CIRCUITS SA647 Low-voltage digital IF receiver Product specification 1998 Aug 10 Philips Semiconductors Philips Semiconductors Product specification Low-voltage digital IF receiver SA647 DESCRIPTION The SA647 is a low-voltage high performance monolithic digital system with high-speed RSSI incorporating a mixer, oscillator with buffered output, two limiting intermediate frequency amplifiers, fast logarithmic received signal strength indicator (RSSI), voltage regulator, RSSI op amp and power down pin. The SA647 is available in TSSOP (thin shrink small outline package). The SA647 was designed for portable digital communication applications and will function down to 2.7V. The limiter amplifier has differential outputs with 2MHz small signal bandwidth. The RSSI output has access to the feedback pin. This enables the designer to level adjust the outputs or add filtering. APPLICATIONS NADC (North American Digital Cellular) Digital receiver systems Cellular radio PIN CONFIGURATION RFIN+ 1 20 MIXOUT 19 IF AMP DECOUP 18 IF AMPIN 17 IF AMPDECOUP 16 IF AMPOUT 15 GND 14 LIMIN 13 LIMDECOUP 12 LIMDECOUP 11 LIM OUT (+) FEATURES VCC = 2.7 to 5.5V Low power receiver (5.3mA @ 3V) Power down mode (ICC = 110µA) Fast RSSI rise and fall times Extended RSSI range with temperature compensation RSSI op amp 2MHz limiter small signal bandwidth Filter matching (1.5kΩ) Differential limiter output Oscillator buffer TSSOP-20 package ORDERING INFORMATION DE...