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SA636DKPHIN/a1350avaiLow voltage high performance mixer FM IF system with high-speed RSSI


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SA636DK
Low voltage high performance mixer FM IF system with high-speed RSSI
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 3V 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 (ICC =200 A)
SA636
Low voltage high performance mixer FM IF system
with high-speed RSSI
Rev. 6 — 5 December 2012 Product data sheet
NXP Semiconductors SA636
Low voltage high performance mixer FM IF system
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
3. Applications
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
4. Ordering information
Table 1. Ordering information
SA636BS 636B HVQFN20 plastic thermal enhanced very thin quad flat package; no leads; terminals; body44 0.85 mm
SOT917-1
SA636DK/01 SA636DK SSOP20 plastic shrink small outline package; 20 leads; body width 4.4 mm SOT266-1
NXP Semiconductors SA636
Low voltage high performance mixer FM IF system
5. Block diagram

NXP Semiconductors SA636
Low voltage high performance mixer FM IF system
6. Pinning information
6.1 Pinning

NXP Semiconductors SA636
Low voltage high performance mixer FM IF system
6.2 Pin description

[1] For the HVQFN20 package, the exposed die attach paddle must be connected to device ground pin 13 and
the PCB ground plane. GND pin must be connected to supply ground for proper device operation. For
enhanced thermal, electrical, and board level performance, the exposed pad needs to be soldered to the
board using a corresponding thermal pad on the board and for proper heat conduction through the board,
thermal vias need to be incorporated in the printed-circuit board in the thermal pad region.
Table 2. Pin description

RF_IN 1 19 RF input
RF_IN_DECOUPL 2 20 RF input decoupling pin
OSC_OUT 3 1 oscillator output (emitter)
OSC_IN 4 2 oscillator input (base)
VCC 5 3 positive supply voltage
RSSI_FEEDBACK 6 4 RSSI amplifier negative feedback terminal
RSSI_OUT 7 5 RSSI output
POWER_DOWN_CTRL8 6 power-down control; active HIGH
DATA_OUT 9 7 data output
QUADRATURE_IN 10 8 quadrature detector input terminal
LIMITER_OUT 11 9 limiter amplifier output
LIMITER_DECOUPL 12 10 limiter amplifier decoupling pin
LIMITER_DECOUPL 13 11 limiter amplifier decoupling pin
LIMITER_IN 14 12 limiter amplifier input
GND 15 13[1] ground; negative supply
IF_AMP_OUT 16 14 IF amplifier output
IF_AMP_DECOUPL 17 15 IF amplifier decoupling pin
IF_AMP_IN 18 16 IF amplifier input
IF_AMP_DECOUPL 19 17 IF amplifier decoupling pin
MIXER_OUT 20 18 mixer output - DAP exposed die attach paddle; connect to ground
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