CMX992Q3

Product Description

The CMX992 is a single-chip, high performance, full-featured RF receiver. It operates from 100MHz to 1GHz and its I/Q architecture supports multiple modulation types and bandwidths with a single radio design. The half-duplex CMX991 integrates Rx demodulators, IF PLL and IF VCO subsystems to minimise the external circuits needed when implementing a complete receiver. User-selected modes suit different application requirements.

The Rx path includes an integrated 1st Rx mixer having two outputs to support two external 1st IF filter choices, then an integrated 2:1 input mux followed by VGA and wideband signal level measurement functions, to support AGC implementation. The 1st IF signal is then either I/Q demodulated to Zero-IF or mixed to a Low IF output. The CMX992 provides differential and single-ended Rx output options and differential amplifiers for flexible signal conditioning.

The CMX992 can be used in a wide range of narrowband and wideband wireless products, including multi-mode analogue/digital terminals. The CMX992 can be used where highly linear modulations are being used, e.g. for applications such as TETRA, where a typical transmitter solution would include the CMX998 Cartesian Feedback Transmitter.

The CMX992 operates from a single 3.3V supply over a temperature range of -40°C to +85°C and is available in a 48-pin VQFN (Q3) package.

Features

• RF mixer with output select
• 1st IF input select
• Selectable low IF outputs (450kHz/455kHz)
• Selectable low IF outputs (450kHz/455kHz)
• 1st IF Variable Gain Amplifier (VGA)
• 1st IF Signal Level Indicator (SLI)
• Two-mode demodulator
• I/Q Zero-IF with differential outputs
• IF LO synthesiser
• IF VCO negative resistance amplifier
• 3.3V low power operation