Low-Voltage Mixer FM IF System with Filter Amplifier and Data Switch
SA639DH Receive alerts
The SA639 is a low-voltage high performance monolithic FM IF system with high-speed RSSI incorporating a mixer/oscillator, two wideband limiting intermediate frequency amplifiers, quadrature detector, logarithmic Received Signal Strength Indicator (RSSI), fast RSSI op amps, voltage regulator, wideband data output, post detection filter amplifier and data switch. The SA639 is available in 24-lead TSSOP (Thin Shrink Small Outline Package).
The SA639 was designed for high-bandwidth portable communication applications and functions down to 2.7 V. The RF section is similar to the famous NE605. The data output provides a minimum bandwidth of 1 MHz to demodulate wideband data. The RSSI output is amplified and has access to the feedback pin. This enables the designer to level adjust the outputs or add filtering.
The post-detection amplifier may be used to realize a low-pass filter function. A programmable data switch routes a portion of the data signal to an external integration circuit that generates a data comparator reference voltage.
SA639 incorporates a Power-down mode which powers down the device when pin 8 (POWER_DOWN_CTRL) is HIGH. Power down logic levels are CMOS and TTL compatible with high input impedance.
Outline 3d SOT355-1
Product Details
Features
- VCC = 2.7 V to 5.5 V
- Low power consumption: 8.6 mA (typical) at 3 V
- Wideband data output (1 MHz minimum)
- Fast RSSI rise and fall times
- Mixer input to >500 MHz
- Mixer conversion power gain of 9.2 dB and noise figure of 11 dB at 110 MHz
- XTAL oscillator effective to 150 MHz (L.C. oscillator to 1 GHz local oscillator can be injected)
- 92 dB of IF amplifier/limiter power gain
- 25 MHz limiter small signal bandwidth
- Temperature compensated logarithmic Received Signal Strength Indicator (RSSI) with a dynamic range in excess of 80 dB
- RSSI output internal op amp
- Post detection amplifier for filtering
- Programmable data switch
- Excellent sensitivity: 2.24 μV into 50 Ω matching network for 10 dB S/N (Signal-to-Noise ratio) with RF at 110 MHz and IF at 9.8 MHz
- ESD hardened
- Power-down mode
Target Applications
- DECT (Digital European Cordless Telephone)
- FSK and ASK data receivers
Documentation
Quick reference to our documentation types.
1-5 of 7 documents
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Application Note
An FM/IF system for DECT and other high speed GFSK applications
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Brochure
RF/IF Building Blocks
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Package Information
plastic thin shrink small outline package; 24 leads; body width 4.4 mm
