CMX991/CMX992 CML Microcircuits RF Quadrature Transmitter and COMMUNICATION SEMICONDUCTORS RF Quadrature/Low IF Receiver D/991 992/22 May 2017 Provisional Issue 1 This document describes two separate, high performance, RF ICs covering the range: 100MHz to 1GHz. The CMX991 is an RF Quadrature Transceiver and the CMX992 is an RF Quadrature Receiver. Features Applications Rx (CMX991 and CMX992) Analogue/digital multimode radio o RF mixer with output select Software Defined Radio (SDR) o 1st IF input select Portable, mobile and base station terminals o Selectable low IF outputs Data telemetry modems (450kHz/455kHz) TETRA (CMX992) o 1st IF Variable Gain Amplifier (VGA) ETSI: EN 300 113, EN 301 166, EN 302 561, o 1st IF Signal Level Indicator (SLI) EN 300 220, TS 102 361 (DMR) o Two-mode demodulator Automatic Identification System (AIS) o I/Q Zero-IF with differential outputs transponders Tx (CMX991 only) Constant envelope and linear modulation o I/Q modulator to IF Compatible with CMX998 (CMX992 only) o Image-reject up-converter Narrowband: e.g. 25kHz, 12.5kHz, 6.25kHz o IF and RF outputs Wideband: up to 2MHz IF (CMX991 and CMX992) APCO Project 25 (P25) Phase 1 and Phase 2 o IF LO synthesiser TDMA: TIA-102.CAAB o IF VCO negative resistance amplifier Satellite communications 3.3V low power operation 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. st st The Rx path includes an integrated 1 Rx mixer having two outputs to support two external 1 IF filter choices, then an integrated 2:1 input mux followed by VGA and wideband signal level measurement st functions, to support AGC implementation. The 1 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 -40C to +85C 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. 2017 CML Microsystems Plc RF Quadrature Transceiver / RF Quadrature Receiver CMX991/CMX992 IF Output Tx T/R I/Q Differential Input Power Amplifier Amplifiers (VC)TCXO Div LO Input Integer-N PLL Power Supply External Resonator & Control Varactors Registers C-BUS /4 LO Input Div CMX991 LNA Rx Level 2 x IF (e.g 455kHz) Outputs or I/Q Outputs IF Filters Figure 1 CMX991 RF Quadrature Transceiver Integer-N Power PLL Supply Differential Amplifiers External Resonator & Control Varactors Registers C-BUS /4 LO Input Div CMX992 T/R SLI From Transmitter 2 x IF (e.g 455kHz) Outputs or I/Q Outputs IF Filters Figure 2 CMX992 RF Quadrature/Low IF Receiver 2017 CML Microsystems Plc 2 D/991 992/22