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CXA3685ER - Direct Conversion IC

General Description

The CXA3685ER is an IC developed for direct orthogonal detection of L band (1 to 2GHz) IF signals in a digital satellite broadcast reception tuner.

This direct conversion (Zero-IF) technology eliminates the need for the SAW filter that was formerly necessary.

Key Features

  • ‹ Low power consumption: 430mW (typ. ) ‹ No need for an external inductor and varactor diode ‹ 3.3V single power supply ‹ Reception frequency: 950MHz to 2150MHz ‹ Wide input range (typ.
  • 65dBm to.
  • 15dBm) ‹ Internal wide band 90° phase shifter ‹ Internal output for controlling an external attenuator ‹ Reference signal output for the demodulation circuit ‹ Enables to use external reference signals ‹ Small package: 48-pin VQFN ‹ Enables to reduce power consumption in power save mode.

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www.DataSheet4U.com Direct Conversion IC for Digital Satellite Broadcast Tuner CXA3685ER Description The CXA3685ER is an IC developed for direct orthogonal detection of L band (1 to 2GHz) IF signals in a digital satellite broadcast reception tuner. This direct conversion (Zero-IF) technology eliminates the need for the SAW filter that was formerly necessary. In addition, the CXA3685ER incorporates an RF gain control amplifier, oscillator circuit, wide-band phase shifter circuit and other RF circuits, a baseband LPF, baseband gain control amplifier, tuning PLL, and the inductor and varactor diode needed for a tuning VCO. This makes it possible to realize the front-end RF block without tuning the RF circuits.