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Information as of 2000-01-10
SA639; Low voltage mixer FM IF system with filter amplifier and data switch
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.
Page count File size (kB) Datasheet
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