DESCRIPTION
The SA615 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 SA615 combines the functions of Signetics’ SA602 and SA604A, but features a higher mixer input intercept point, higher IF bandwidth (25MHz) and temperature compensated RSSI and limiters permitting higher performance application. The SA615 is available in 20-lead dual-in-line plastic, 20-lead SOL (surface-mounted miniature package) and 20-lead SSOP (shrink small outline package).

FEATURES
• Low power consumption: 5.7mA typical at 6V
• Mixer input to >500MHz
• Mixer conversion power gain of 13dB at 45MHz
• Mixer noise figure of 4.6dB at 45MHz
• XTAL oscillator effective to 150MHz (L.C. oscillator to 1GHz local oscillator can be injected)
• 102dB of IF Amp/Limiter gain
• 25MHz limiter small signal bandwidth
• Temperature compensated logarithmic Received Signal Strength Indicator (RSSI) with a dynamic range in excess of 90dB
• Two audio outputs – muted and unmuted
• Low external component count; suitable for crystal/ceramic/LC filters
• Excellent sensitivity: 0.22µV into 50Ω matching network for 12dB SINAD (Signal to Noise and Distortion ratio) for 1kHz tone with RF at 45MHz and IF at 455kHz
• SA615 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