General description
The SA605 is a high performance monolithic low-power FM IF system incorporating a mixer/oscillator, two limiting intermediate frequency amplifiers, quadrature detector, muting, logarithmic received signal strength indicator (RSSI), and voltage regulator. The SA605 combines the functions of NXP SA602A and SA604A, but features a higher mixer input intercept point, higher IF bandwidth (25 MHz) and temperature compensated RSSI and limiters permitting higher performance application. The SA605 is available in 20-lead SO (surface-mounted miniature package) and 20-lead SSOP (shrink small outline package).

Features and benefits
■ Low power consumption: 5.7 mA typical at 6 V
■ Mixer input to >500 MHz
■ Mixer conversion power gain of 13 dB at 45 MHz
■ Mixer noise figure of 4.6 dB at 45 MHz
■ XTAL oscillator effective to 150 MHz (L/C oscillator to 1 GHz local oscillator can be injected)
■ 102 dB of IF amplifier/limiter gain
■ 25 MHz limiter small signal bandwidth
■ Temperature-compensated logarithmic Received Signal Strength Indicator (RSSI) with a dynamic range in excess of 90 dB
■ Two audio outputs — muted and unmuted
■ Low external component count; suitable for crystal/ceramic/LC filters
■ Excellent sensitivity: 0.22 V into 50  matching network for 12 dB SINAD (Signal-to-Noise-and-Distortion ratio) for 1 kHz tone with RF at 45 MHz and IF at 455 kHz
■ SA605 meets cellular radio specifications
■ ESD hardened

Applications
■ Cellular radio FM IF
■ High performance communications receivers
■ Single conversion VHF/UHF receivers
■ SCA receivers
■ RF level meter
■ Spectrum analyzer
■ Instrumentation
■ FSK and ASK data receivers
■ Log amps
■ Wideband low current amplification