SA58641 Ver la hoja de datos (PDF) - NXP Semiconductors.
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SA58641 Datasheet PDF : 26 Pages
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SA58641
High performance mixer FM IF system with high-speed RSSI
Rev. 2 — 9 March 2012
Product data sheet
1. General description
The SA58641 is a 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 SA58641 is available in 20-lead SSOP
(Shrink Small Outline Package).
The SA58641 was designed for high bandwidth portable communication applications and
will function down to 3 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.
SA58641 incorporates a power-down mode which powers down the device when pin 8
(POWER_DOWN_CTRL) 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: 7.5 mA typical at 5 V
Mixer input to >500 MHz
Mixer noise figure of 12 dB at 240 MHz
Crystal 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 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
ESD hardened
10.7 MHz filter matching (330 )
Power-down mode (ICC = 200 A)
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