CMX973 Modulator/Demodulator Datasheet

CMX973 Datasheet, PDF, Equivalent


Part Number

CMX973

Description

Quadrature Modulator/Demodulator

Manufacture

CML

Total Page 30 Pages
Datasheet
Download CMX973 Datasheet


CMX973
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CMX973
Quadrature
Modulator/Demodulator
D/973/12 April 2019
Provisional Issue
Features
20 300MHz IF/RF Demodulator
10MHz Rx and 25MHz Tx I/Q Bandwidth
20 1000 MHz RF Modulator
0dBm Modulator Output
< 1 degree I/Q Phase Matching
< 0.5 dB I/Q Gain Matching
Low Power, 3.0V 3.6V Operation
Small 32-lead VQFN Package
Applications
Wireless Data Terminals
HF/VHF and UHF Mobile Radio
Avionics Radio Systems
Telemetry Modems
Wireless Microphones
Software Defined Radio (SDR)
Satellite Terminals
TXIN
RXLO
VCO
P2
VCO
P1
VCO VCO
N1 N2 OA1O OA1N
TXIP
TXQP
TXQN
RFOUT
IFIN
VCC
RXIN
RXIP
Quadrature
transmitter
Quadrature
demodulator
VCO
40-1000MHz
Local oscillator
switching
Serial bus
PLL and
control
OA1P
VSS
CSN
OA2O
OA2N
OA2P
RDATA
SCLK
RXQP RXQN TXLO REFIN DO
VCC
SYNTH
CDATA
VDD
1 Brief Description
The CMX973 integrates a quadrature (I/Q) modulator and a low-power quadrature IF/RF demodulator,
both featuring a wide operating frequency range and optimised power consumption. The demodulator is
suitable for superheterodyne architectures with IF frequencies up to 300MHz and the device may be used
in low IF systems or those converting down to baseband. The modulator converts directly from baseband
to the desired transmit frequency and features quadrature phase correction to minimise unwanted spectral
components. An on-chip PLL and VCO, together with uncommitted baseband differential amplifiers,
provide additional flexibility. Control of the CMX973 is by serial bus. The CMX973 is supplied in an RF-
optimised 32-lead VQFN package.
2019 CML Microsystems Plc

CMX973
Quadrature Modulator/Demodulator
CMX973
CONTENTS
Section
Page
1 Brief Description .................................................................................................. 1
1.1 History.............................................................................................................. 4
2 Block Diagram ...................................................................................................... 5
3 Pin List .................................................................................................................. 6
4 External Components .......................................................................................... 7
4.1 Power Supply Decoupling ............................................................................... 7
4.2 Quadrature Modulator...................................................................................... 8
4.3 Quadrature Demodulator ................................................................................. 8
4.4 Local Oscillator (LO) Input ............................................................................... 9
4.5 VCO and PLL................................................................................................... 9
4.6 Differential Amplifiers..................................................................................... 12
4.6.1 I/Q Output Amplifiers ............................................................................... 12
4.6.2 Low IF Output.......................................................................................... 13
5 General Description ........................................................................................... 14
5.1 Quadrature Modulator.................................................................................... 14
5.1.1 Local Oscillator (LO) ............................................................................... 14
5.1.2 DC Offsets and Carrier Leakage............................................................. 14
5.2 Quadrature Demodulator ............................................................................... 14
5.2.1 I/Q Amplitude and Phase Correction ...................................................... 15
5.2.2 DC Offset Correction ............................................................................... 17
5.3 Differential Amplifiers..................................................................................... 17
5.4 Local Oscillator (LO) ...................................................................................... 18
5.4.1 Demodulator LO Input............................................................................. 18
5.4.2 Modulator LO Input ................................................................................. 18
5.4.3 VCO and PLL .......................................................................................... 19
6 C-BUS Interface and Register Description ...................................................... 21
6.1 General Reset Command .............................................................................. 22
6.1.1 General Reset Command - $1A: no data................................................ 22
6.2 General Control Register ............................................................................... 23
6.2.1 General Control Register - $1B: 8-bit write ............................................. 23
6.2.2 General Control Register - $EB: 8-bit read ............................................. 23
6.3 Rx Control Register ....................................................................................... 23
6.3.1 Rx Control Register - $1C: 8-bit write ..................................................... 23
6.3.2 Rx Control Register - $EC: 8-bit read ..................................................... 24
6.4 Rx Mode Register .......................................................................................... 24
6.4.1 Rx Mode Register - $1D: 8-bit write ........................................................ 24
6.4.2 Rx Mode Register - $ED: 8-bit read........................................................ 25
6.5 Tx Control Register........................................................................................ 25
6.5.1 Tx Control Register - $1E: 8-bit write...................................................... 25
6.5.2 Tx Control Register - $EE: 8-bit read...................................................... 26
6.6 Rx Offset Register ......................................................................................... 27
6.6.1 Rx Offset Register - $1F: 8-bit write........................................................ 27
6.6.2 Rx Offset Register - $EF: 8-bit read........................................................ 27
6.7 PLL M Divider ................................................................................................ 28
6.7.1 PLL M Divider - $2C - $2A: 8-bit write .................................................... 28
6.7.2 PLL M Divider - $DC - $DA: 8-bit read.................................................... 28
6.8 PLL R Divider................................................................................................. 28
6.8.1 PLL R Divider - $2E - $2D: 8-bit write..................................................... 28
2019 CML Microsystems Plc
2
D/973/12


Features CML Microcircuits COMMUNICATION SEMICOND UCTORS CMX973 Quadrature Modulator/Dem odulator D/973/12 April 2019 Provisio nal Issue Features  20 – 300MHz I F/RF Demodulator  10MHz Rx and 25MHz Tx I/Q Bandwidth  20 – 1000 MHz R F Modulator  0dBm Modulator Output < 1 degree I/Q Phase Matching  < 0.5 dB I/Q Gain Matching  Low Power, 3.0V – 3.6V Operation  Small 32-l ead VQFN Package Applications  Wire less Data Terminals  HF/VHF and UHF Mobile Radio  Avionics Radio Systems  Telemetry Modems  Wireless Micr ophones  Software Defined Radio (SDR )  Satellite Terminals TXIN RXLO VCO P2 VCO P1 VCO VCO N1 N2 OA1O OA1N TXIP TXQP TXQN RFOUT IFIN VCC RXIN RX IP Quadrature transmitter Quadrature d emodulator VCO 40-1000MHz Local oscill ator switching Serial bus PLL and contr ol OA1P VSS CSN OA2O OA2N OA2P RDATA S CLK RXQP RXQN TXLO REFIN DO VCC SYNTH CDATA VDD 1 Brief Description The CMX973 integrates a quadrature (I/Q) modulator and a low-power quadrature IF/RF demodulator, both f.
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