SA676DK/01,112

SA676 Low-voltage mixer FM IF system Rev. 3 19 July 2012 Product data sheet 1. General 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. 2. Features and benefits Low power consumption: 3.5 mA typical at 3 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 amplifier/limiter gain 2 MHz IF amp/limiter small signal bandwidth Temperature compensated logarithmic Received Signal Strength Indicator (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 exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101 Latch-up testing is done to JEDEC Standard JESD78 Class II, Level B 3. Applications Cordless telephonesSA676 NXP Semiconductors Low-voltage mixer FM IF system 4. Ordering information Table 1. Ordering information T = 40 C to +85 C amb Type number Topside Package mark Name Description Version SA676DK/01 SA676DK SSOP20 plastic shrink small outline package 20 leads SOT266-1 body width 4.4 mm 5. Block diagram 20 19 18 17 16 15 14 13 12 11 IF amp limiter mixer RSSI OSC quad VREG audio EB 1234 5 678910 002aag116 Fig 1. Block diagram SA676 All information provided in this document is subject to legal disclaimers. NXP B.V. 2012. All rights reserved. Product data sheet Rev. 3 19 July 2012 2 of 22 RF IN MIXER OUT RF IN DECOUPL IF AMP DECOUPL OSC OUT IF AMP IN OSC IN IF AMP DECOUPL RSSI OUT IF AMP OUT V GND CC AUDIO FEEDBACK LIMITER IN AUDIO OUT LIMITER DECOUPL RSSI FEEDBACK LIMITER DECOUPL QUADRATURE IN LIMITER OUT