CMX991/CMX992
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CML Microcircuits COMMUNICA TION SEMICONDUCTORS CMX991/CMX992 RF Quadrature Transmitter and RF Quadrature/Low IF Receiver 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. 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 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 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 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 -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.

RF Quadrature Transceiver / RF Quadrature Receiver Power Amplifier Power Supply External Resonator & Varactors Control Registers C-BUS Figure 1 CMX991 – RF Quadrature Transceiver Power Supply Differential Amplifiers External Resonator & Varactors Control Registers C-BUS From Transmitter 2 x IF (e.g 455kHz) Outputs or I/Q Outputs Figure 2 CMX992 – RF Quadrature/Low IF Receiver

RF Quadrature Transceiver / RF Quadrature Receiver

RF Quadrature Transceiver / RF Quadrature Receiver

RF Quadrature Transceiver / RF Quadrature Receiver Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33

RF Quadrature Transceiver / RF Quadrature Receiver Changes 1S305 (typo) corrected to 1SV305; SMV1279 (typo) corrected to SMV1249 Typo in note to section 4.5 corrected, ‘b1’ corrected to ‘b7’ Information added on Rx dc offset variation with temperature (section 7.13) Receiver IF section 1 dB Compression point changed to typical; measurement method clarified (section 8.1.3.2). Half IF specification changed to reflect production test limit (section 8.1.3.2). JDV2S08S replaced with 1S305FCT in Table 14 as JDV diode is obsolete. Various editorial corrections. Alternative diodes added in Table...

RF Quadrature Transceiver / RF Quadrature Receiver Block Diagrams TXIFOUT TXIP TXIN TXQP TXQN Select VDDIO FREF Control Registers RESETN RDATA Limiting VCO Amp External Resonator & Varactors DGND VCCSYNTH LNAON MIXLOP Power Supply Select / Bypass RXIN RXIP IAMPP RXQN RXQP QAMPP QAMPN Figure 3 CMX991 Block Diagram VDDIO FREF Control Registers RESETN RDATA Limiting VCO Amp External Resonator & Varactors VCON VCOP LNAON MIXLOP MIXLON SCLK CDATA CSN DGND VCCSYNTH Power Supply Select / Bypass VCCIF VCCRF RXIN RXIP IAMPP RXQN RXQP Figure 4 CMX992 Block Diagram 2015 CML Microsystems Plc

RF Quadrature Transceiver / RF Quadrature Receiver Signal Type MIXINN MIXINP MIXLON MIXLOP VCCRF MIXOUT1 MIXOUT2 IFIP1 IFIP2 IFINN SLI RXQN RXQP QAMPP QAMPN QAMPO RXIN RXIP IAMPP IAMPN IAMPO DGND MIXINN MIXINP MIXLON MIXLOP VCCRF MIXOUT1 MIXOUT2 IFIP1 IFIP2 IFINN SLI RXQN RXQP QAMPP QAMPN QAMPO RXIN RXIP IAMPP IAMPN IAMPO DGND RESETN DVDD RESETN DVDD Description Supply for IF circuits CMX991: Tx section positive output CMX992: Do not connect to this pin, reserved for future use CMX991: Tx section positive output CMX992: Do not connect to this pin, reserved for future use Do not connect to...

RF Quadrature Transceiver / RF Quadrature Receiver VDDIO LNAON VCCSYNTH FREF DOIF VCOP VCON VDDIO LNAON VCCSYNTH FREF DOIF VCOP VCON Signal Type Supply to C-BUS circuits Control line to enable/disable Rx LNA Supply to IF integer N PLL Reference frequency input IF PLL charge pump output IF PLL VCO positive input IF PLL VCO negative input Bandgap generated bias voltage – measurement 43 VBIAS VBIAS O/P output I/P CMX991: TxQ positive input TXQP 44 NC CMX992: Do not connect to this pin, reserved for (Note 2) NC future use I/P CMX991: TxQ negative input TXQN 45 NC CMX992: Do not connect to this...