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CMX970
(RF Building Block)
PP970/4 July 2012
IF/RF Quadrature Demodulator
Introduction
The CMX970 is the first of a new
range of RF Building Block ICs
from CML.
Low power consumption,
flexibility and high performance
are key values of the RF Building
Block products.
The CMX970 IF/RF Quadrature
Demodulator offers very low
power consumption and high-
performance over the
operating range of 20 - 300 MHz.
The wide 10MHz I/Q bandwidth,
variable gain adjustment and
serial bus or direct control
operation, deliver a level of
flexibility and previously
unavailable features, at the
heart of the product.
Size is an important factor in
many radio designs, the CMX970
addresses this with its availabil-
ity in a very small 16-pin VQFN
package (4mm x 4mm x 1mm).
CMX970 Brief Description
The CMX970 is a low power IF or RF quadrature demodulator featuring a wide operating
frequency range and low power consumption. Suitable for architectures with IF or RF
frequencies up to 300MHz, the device may be used in low IF systems or those converting
down to baseband. Control of the CMX970 may be either by serial bus or direct control (with
reduced flexibility).
The small, RF-optimised VQFN package and minimal external components make the device
ideal for space-constrained applications.
Features
20-300 MHz IF/RF demodulator
10MHz I/Q bandwidth
Serial bus or direct control operation
Variable gain and dc offset adjustment
Low power 3.0 - 3.6 V operation
Small 16-pin VQFN package
Key Benefits
Flexible RF Building Block solution
Low power consumption
High performance
Flexibility
Configurability with correction modes
Best in class intermodulation performance
Excellent phase/amplitude balance
Serial bus configuration
Direct control option for host-less operation
Small 16-pin VQFN
N/C
LO
LOGND
CBUSOFFN
Applications
Wireless Data Terminals
HF, VHF and UHF Mobile
Radio
RFGND
VSS
Avionics Radio Systems
High-performance profes-
sional radios
RFIN
Gain
Divide
2/4
CBUS logic
CSN/
GAIN
VCC
Gain
SCLK/
DIVSET
RXIP
CDATA/
RESETN
RXIN
RXQP
RXQN
VDD
CMX970 Function Diagram
© 2012 CML Microsystems Plc
1
CMX970 IF/RF Quadrature Demodulator
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Quadrature Demodulator
The quadrature demodulator is designed for IF/RF operation and has very low power consumption. Input frequencies in the
range 20 to 300 MHz are allowed. The demodulator system has two gain stages, one before and one after the I/Q
down-converters and the gain elements can be independently controlled. This flexible architecture allows the users to
optimise characteristics depending on their system requirements. Optimum noise figure can be achieved by maximising gain in
first gain stage and minimising gain in the second stage. Intermodulation performance can be optimised by decreasing gain in
the first or second stages. A lower gain in the second gain stage will tend to reduce dc offsets in the output I/Q signal. Further
detailed information on the effects of controlling gain stages is available in the CMX970 datasheet.
CMX970 RF Receiver
T/R
Divider
‘Q’ In
‘I’ In
CMX7861
FirmCODEC
®
Receive Processing
PLLs/
VCO
CMX998 CFBL Transmitter
Transmit Processing
C-BUS
‘I’ Out
DSP
Microcontroller
PA
Divider
‘Q’ Out
90
DACs
GPIO
Clocks
Typical system application utilising:
CMX970—IF/RF Quadrature Demodulator
CMX998—Cartesian Feedback Loop (CFBL) Transmitter
CMX7861—Programmable Baseband Interface IC
© 2012 CML Microsystems Plc
2
Auxiliary Systems
ADC
CMX970 IF/RF Quadrature Demodulator
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Evaluation Support
The EV9700 is an Evaluation Kit designed for evaluating and demonstrating the capabilities of the CMX970 integrated circuit.
All the circuits necessary to demonstrate the facilities provided by the IC, such as matching circuits, power supply regulators,
etc are provided on the EV9700 board.
A C-BUS interface connector is provided for control of the EV9700 by a host microcontroller or CML PE0002 interface card. The
CMX970 can also be used in a ‘direct control’ mode, where a host or PE0002 is not required. Alternatively any microcontroller
evaluation/emulator kit can be used to drive the CMX970/EV9700 serial bus.
Package
Mechanical Outline of the 16-pin VQFN (Q7)
Order as part no. CMX970Q7
© 2012 CML Microsystems Plc
3
CMX970 IF/RF Quadrature Demodulator
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Electrical Specification Summary
Operating Limits
Supply Voltage:
Digital Supply (V
DD
– V
SS)
Analogue Supply (V
CC
– V
RFGND
)
Operating Temperature
Local Oscillator Input
RF/IF Input
3.0
3.0
-40
40
20
3.3
3.3
-
-
-
3.6
3.6
+85
500
300
V
V
°C
MHz
MHz
Min
Typ
Max
Unit
DC Parameter - Supply Current
Total Current Consumption:
Powersave mode
Bias only
Operating
Min
Typ
Max
Unit
-
-
-
10
1.5
15
-
-
-
µA
mA
mA
IF/RF Amplifier and Quadrature Demodulator
Performance Figures:
Gain
Noise figure
Third order intercept point (input)
Min
Typ
Max
Unit
-
-
-
56
10
-15
-
-
-
dB(V/V)
dB
dBm
Comprehensive technical datasheet and support material is available from the CML website.
Click here to link to the
CML website
or search for: CMX970
FirmASIC, FirmCODEC, RALCWI, Function Image and DuraTALK are trademarks of CML Microsystems Plc.
Phone:
+44 (0) 1621 875500
+1 336 744 5050
800 638 5577
+65 62 888129
Fax:
Email Sales:
Email Tech Support:
+44 (0) 1621 875600
Sales@cmlmicro.com
techsupport@cmlmicro.com
+1 336 638 5577
us.sales@cmlmicro.com
us.techsupport@cmlmicro.com
+65 62 888230
sg.sales@cmlmicro.com
sg.techsupport@cmlmicro.com
www.cmlmicro.com
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