SA626

• Fast RSSI rise and fall times
• Low power consumption: 6.5mA typ at 3V
• Power down mode (ICC = 200A)
• Mixer input to >500MHz
• Mixer conversion power gain of 11dB at 240MHz
• Mixer noise figure of 14dB at 240MHz
• XTAL oscillator effective to 150MHz (L.C. oscillator to 1GHz, local oscillator can be injected)
• 92dB of IF Amp/Limiter power gain
• 25MHz limiter small signal bandwidth
• Temperature compensated logarithmic Received Signal Strength Indicator (RSSI) with a dynamic range in excess of 90dB
• Audio output internal buffer
• RSSI output internal buffer
• Internal op amps with rail-to-rail outputs
• 10.7MHz filter matching (330) reduces external component count; suitable for crystal/ceramic/LC filters
• Excellent sensitivity: 0.54V into 50 matching network for 12dB SINAD (Signal to Noise and Distortion ratio) for 1kHz tone with RF at 240MHz and IF at 10.7MHz
• SA626 meets cellular radio specifications
• ESD hardened

The SA626 is a low-voltage high performance monolithic FM IF system incorporating a mixer/oscillator, two limiting intermediate frequency amplifiers, quadrature detector, high speed logarithmic received signal strength indicator (RSSI), voltage regulator and audio and fast RSSI op amps. The SA626 is available in 20-lead SOL (surface-mounted small outline large package) and 20-lead SSOP (shrink small outline package).

The SA626 was designed for high bandwidth portable communication applications and will function down to 2.7V. The RF section is similar to the famous NE605. The audio and RSSI outputs have amplifiers. The RSSI output SA626 has access to the feedback pin. This enables the designer to level adjust the outputs or add filtering.

SA626 incorporates a power down mode which powers down the device when Pin 8 is low. Power down logic levels are CMOS and TTL compatible with high input impedance.