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Information as of 2000-01-10
 Latest information online
SA639; Low voltage mixer FM IF system with filter amplifier and data switch
| Description |  |
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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 will function down to 2.7V. The RF
section is similar to the famous NE605. The data output provides a
minimum bandwidth of 1MHz 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 is high. Power down logic levels are CMOS and
TTL compatible with high input impedance.
| Features | |
- VCC = 2.7 to 5.5V
- Low power consumption: 8.6mA typ at 3V
- Wideband data output (1MHz min.)
- Fast RSSI rise and fall times
- Mixer input to >500MHz
- Mixer conversion power gain of 9.2dB and noise figure of 11dB at
110MHz
- 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 80dB
- RSSI output internal op amp
- Post detection amplifier for filtering
- Programmable data switch
- Excellent sensitivity: 2.24µV into 50W matching network for 10dB
SNR (Signal to Noise Ratio) with RF at 110MHz and IF at 9.8MHz
- ESD hardened
- Power down mode
| Applications | |
- DECT (Digital European Cordless Telephone)
- FSK and ASK data receivers
| Datasheet | |
| Products, packages, availability and ordering | |
Please note, devices listed in the "Products, packages, availability and ordering" table marked with "WIT" are discontinued. Devices marked with "DOD" will be in the near future.
Contact your nearest sales or distributor office for the latest information on product status and availability.
| Find similar products: | |
SA639 links to the similar products page containing an overview of products that are similar in function or related to the part number(s) as listed on this page. The similar products page includes products from the same catalog tree(s) , relevant selection guides and products from the same functional category.
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