SA636_15 Datasheet, PDF (1/31 Pages) NXP Semiconductors – Low voltage high performance mixer FM IF system with high-speed RSSI

SA636
Low voltage high performance mixer FM IF system
with high-speed RSSI
Rev. 6 — 5 December 2012
Product data sheet
1. General description
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.
2. Features and benefits
 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 V into 50  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 )
 Power-down mode (I_CC = 200 A)