CMX991 Datasheet, PDF (1/56 Pages) CML Microcircuits – Two-mode demodulator

CMX991/CMX992
CML Microcircuits _{RF Quadrature Transmitter and}
COMMUNICATION SEMICONDUCTORS _{RF Quadrature/Low IF Receiver}
D/991_992/20 February 2015
Provisional Issue
This document describes two separate, high performance, RF ICs covering the range: 100MHz¹ to 1GHz.
The CMX991 is an RF Quadrature Transceiver and the CMX992 is an RF Quadrature Receiver.
Features
 Rx (CMX991 and CMX992)
o RF mixer with output select
o 1st IF input select
o Selectable low IF outputs
(450kHz/455kHz)
o 1st IF Variable Gain Amplifier (VGA)
o 1st IF Signal Level Indicator (SLI)
o Two-mode demodulator
o I/Q Zero-IF with differential outputs
 Tx (CMX991 only)
o I/Q modulator to IF
o Image-reject up-converter
o IF and RF outputs
 IF (CMX991 and CMX992)
o IF LO synthesiser
o IF VCO negative resistance amplifier
 3.3V low power operation
Applications
 Analogue/digital multimode radio
 Software Defined Radio (SDR)
 Portable, mobile and base station terminals
 Data telemetry modems
 TETRA (CMX992)
 ETSI: EN 300 113, EN 301 166, EN 302 561,
EN 300 220, TS 102 361 (DMR)
 Automatic Identification System (AIS)
transponders
 Constant envelope and linear modulation
 Compatible with CMX998 (CMX992 only)
 Narrowband: e.g. 25kHz, 12.5kHz, 6.25kHz
 Wideband: up to 2MHz
 APCO Project 25 (P25) Phase 1 and Phase 2
TDMA: TIA-102.CAAB
 Satellite communications
1 Brief Description
The CMX991 is a single-chip, high performance, RF transceiver that provides the core functions required
to implement a full-featured radio transmitter and 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 Tx modulators, Rx demodulators, IF PLL and IF VCO subsystems to minimise the
external circuits needed when implementing a complete transceiver. User-selected modes suit different
application requirements.
The Tx path includes an I/Q modulator to accurately generate modulation at the IF frequency, which may
then be translated to the final RF frequency by an integrated image-reject up-converter system. The I/Q
modulator IF output is also made available for conversion to RF via external circuits, if desired.
The Rx path includes an integrated 1^st Rx mixer having two outputs to support two external 1^st IF filter
choices, then an integrated 2:1 input mux followed by VGA and wideband signal level measurement
functions, to support AGC implementation. The 1^st IF signal is then either I/Q demodulated to Zero-IF or
mixed to a Low IF output. The CMX991 provides differential and single-ended Rx output options and
differential amplifiers for flexible signal conditioning.
The CMX992 is a single-chip, high performance, RF receiver that includes the core RF and IF receive
functions of the CMX991 above and 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.
Both devices operate from a single 3.3V supply over a temperature range of -40°C to +85°C and are
available in 48-pin VQFN (Q3) packages.
1 _{The CMX991/CMX992 may be used at lower frequencies by using appropriate external components. Use below 100MHz is}
covered in a separate application note available from the CML website.
 2015 CML Microsystems Plc