Low-Voltage High-Performance Mixer FM IF System with High-Speed RSSI

SA636
  • Archived
  • This page contains information on a product that is no longer manufactured (discontinued). Specifications and information herein are available for historical reference only.

The SA636 is a low-voltage high performance monolithic FM IF system with high-speed RSSI incorporating a mixer/oscillator, two limiting intermediate frequency amplifiers, quadrature detector, logarithmic Received Signal Strength Indicator (RSSI), voltage regulator, wideband data output and fast RSSI op amps. The SA636 is available in 20-lead SSOP (Shrink Small Outline Package) and HVQFN20 (quad flat package).

The SA636 was designed for high bandwidth portable communication applications and will function down to 2.7 V. The RF section is similar to the famous SA605. The data output has a minimum bandwidth of 600 kHz. This is designed to demodulate wideband data. The RSSI output is amplified. The RSSI output has access to the feedback pin. This enables the designer to adjust the level of the outputs or add filtering.

SA636 incorporates a power-down mode which powers down the device when POWER_DOWN_CTRL pin is LOW. Power-down logic levels are CMOS and TTL compatible with high input impedance.

Product Details

Features

Key Features

  • Wideband data output (600 kHz minimum)
  • Fast RSSI rise and fall times
  • Low power consumption: 6.5 mA typical at 3 V
  • Mixer input to >500 MHz
  • Mixer conversion power gain of 11 dB at 240 MHz
  • Mixer noise figure of 12 dB at 240 MHz
  • XTAL oscillator effective to 150 MHz (LC oscillator to 1 GHz local oscillator can be injected)
  • 92 dB of IF amp/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
  • RSSI output internal op amp
  • Internal op amps with rail-to-rail outputs
  • Low external component count; suitable for crystal/ceramic/LC filters
  • Excellent sensitivity: 0.54 μV into 50 Ω matching network for 12 dB SINAD (Signal-to-Noise And Distortion ratio) for 1 kHz tone with RF at 240 MHz and IF at 10.7 MHz
  • 10.7 MHz filter matching (330 Ω)
  • Power-down mode (ICC = 200 μA)
  • 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
  • DECT (Digital European Cordless Telephone)
  • Digital cordless telephones
  • Digital cellular telephones
  • Portable high performance communications receivers
  • Single conversion VHF/UHF receivers
  • FSK and ASK data receivers
  • Wireless LANs

Part numbers include: SA636DK.

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