CMX973 Datasheet, PDF (1/4 Pages) CML Microcircuits – Very small 32-lead Package

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CMX973
Quadrature Modulator/Demodulator
(RF Building Block)
PP973/1 June 2012
Introduction
The CMX973 Quadrature
Modulator/Demodulator is a
new addition to the CML RF
Building Block product range,
where low power consumption,
flexibility and high performance
are key values .
The CMX973 Quadrature
Modulator/Demodulator offers
very low power consumption
and high performance over a
wide operating range.
The CMX973 forms the basis of a
high-performance RF transceiv-
er system combining a flexible
IF/RF quadrature modulator and
quadrature demodulator, in one
chip.
Wide signal bandwidth at RF,
0dBm output, low noise and
serial bus control, delivers
maximum flexibility and high
performance, all at an attractive
low operating power.
Size is an important factor in
many radio designs, the CMX973
addresses this with its
availability in a very small, RF
optimised 32-pin VQFN package
(5mm x 5mm x 1mm).
CMX973 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, pro-
vide additional flexibility. Control of the CMX973 is by serial bus. The CMX973 is supplied in
an RF-optimised 32-lead VQFN package.
Features
 20MHz - 300MHz IF/RF demodulator
 20MHz - 1GHz RF modulator
 I/Q bandwidth: 10MHz Rx and 25MHz Tx
 0dBm modulator output level
 < 1degree I/Q phase matching
 < 0.5dB I/Q gain matching
 Serial bus control
 Low-power operation 3.0V - 3.6V
 Very small 32-lead Package
Key benefits
 Flexible RF Building Block solution
 Low power consumption
 High performance
 Flexibility
 Low noise
 Small VQFN packaging
 Simple interfacing to existing modem/
baseband products
TXIN
RXLO
VCO
P2
VCO
P1
VCO VCO
N1
N2 ^{OA1O OA1N}
Applications
 Wireless data terminals
 HF, VHF and UHF mobile
radio
 Avionics radio systems
 Telemetry modems
 High-performance
professional radios
 Satellite terminals
 Software Defined Radio
(SDR)
32-pin VQFN
(5mm x 5mm x 1mm)
TXIP
TXQP
TXQN
RFOUT
IFIN
VCC
RXIN
RXIP
Quadrature
modulator
Quadrature
demodulator
VCO
40-500MHz
Local oscillator
switching
Serial bus
PLL
and
control
OA1P
VSS
CSN
OA2O
OA2N
OA2P
RDATA
SCLK
© 2012 CML Microsystems Plc
RXQP RXQN TXLO REFIN DO
VCC
SYNTH
CDATA
VDD
CMX973 Function Diagram
1