CMX973 Product Preview

Product Preview
PP973/1 June 2012
CMX973
Quadrature Modulator/Demodulator
(RF Building Block)
Introduction
CMX973 Brief Description
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 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 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 transceiver 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.
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.
Features
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Key benefits
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).
TXIN
Applications
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Flexible RF Building Block solution
Low power consumption
High performance
Flexibility
Low noise
Small VQFN packaging
Simple interfacing to existing modem/
baseband products
RXLO
VCO
P2
VCO
P1
VCO
N1
VCO
N2
OA1O
OA1P
VCO
40-500MHz
TXQP
VSS
Quadrature
modulator
TXQN
32-pin VQFN
(5mm x 5mm x 1mm)
CSN
RFOUT
OA2O
Local oscillator
switching
IFIN
OA2N
VCC
OA2P
Quadrature
demodulator
RXIN
PLL
RXIP
RXQP
RXQN
TXLO
REFIN
DO
Serial bus
and
control
VCC
CDATA
SYNTH
CMX973 Function Diagram
© 2012 CML Microsystems Plc
OA1N
TXIP
 Wireless data terminals
 HF, VHF and UHF mobile
radio
Avionics radio systems
Telemetry modems
High-performance
professional radios
Satellite terminals
Software Defined Radio
(SDR)
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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
1
VDD
RDATA
SCLK
CMX973 Quadrature Modulator/Demodulator
Product Preview
Quadrature Modulation
Quadrature (I/Q) modulation provides a number of advantages over conventional two-point modulation schemes. Two-point
modulation requires calibration/adjustment to achieve optimum performance. I/Q modulation is the answer, providing
maximum flexibility in the digital domain and allowing coherent phase to be achieved. An I/Q modulator provides accurate
phase modulation. I/Q baseband signals are mixed up to RF by two double-balanced mixers driven by the same frequency but
separated in phase by 90 degrees. The outputs of the two mixers are then summed to provide the modulated output.
Quadrature Demodulation
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 users to optimise
characteristics depending on their system requirements. Optimum noise figure can be achieved by maximising the 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 CMX973 datasheet.
Typical system application using:
CMX973—Quadrature Modulator/Demodulator
CMX7861—Programmable Baseband Interface IC
© 2012 CML Microsystems Plc
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CMX973 Quadrature Modulator/Demodulator
Product Preview
Evaluation Support
The EV9730 is an Evaluation Kit designed for evaluating and demonstrating the capabilities of the CMX973 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 EV9730 board.
A C-BUS serial interface connector is provided for control of the EV9730 by a host microcontroller or CML PE0002 interface
card. Alternatively any microcontroller evaluation/emulator kit can be used to drive the CMX973/EV9730 serial bus.
Package
DIM.
*
*
MIN.
A
B
C
F
G
H
J
K
L
L1
P
T
TYP.
MAX.
5.00 BSC
0.80
3.00
3.00
0.00
0.18
0.20
0.30
0
5.00 BSC
0.90
0.25
1.00
3.80
3.80
0.05
0.30
0.55
0.15
0.50
0.20
NOTE :
*
Exposed
Metal Pad
A & B are reference data and do
not include mold deflash or protrusions.
All dimensions in mm
Angles are in degrees
Index Area 1
Dot
Index Area 2
Dot
Chamfer
Index Area 1 is located directly above Index Area 2
Depending on the method of lead termination at the edge of the package, pull back (L1) may be present.
L minus L1 to be equal to, or greater than 0.3mm
The underside of the package has an exposed metal pad which should ideally be soldered to the pcb to enhance the thermal
conductivity and mechanical strength of the package fixing. Where advised, an electrical connection to this metal pad may also
be required
Mechanical Outline of the 32-pin VQFN (Q5)
© 2012 CML Microsystems Plc
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CMX973 Quadrature Modulator/Demodulator
Product Preview
Electrical Specification Summary
Operating Limits
Min
Typ
Max
Unit
3.0
3.0
-
3.6
3.6
V
V
-40
40
20
-
+85
2000
1000
°C
MHz
MHz
Min
Typ
Max
Unit
-
7
1.7
63
15
-
µA
mA
mA
mA
Quadrature Modulator
Min
Typ
Max
Unit
Performance Figures:
Output Power (PEP)
Noise Floor
Equivalent Output IP3
-
0
-150
21
-
dBm
dBm/Hz
dBm
Min
Typ
Max
Unit
-
56
10
-
dB(V/V)
dB
-
-15
-
dBm
Supply Voltage:
Digital Supply (VDD – VSS)
Analogue Supply (VCC – VRFGND)
Operating Temperature
Local Oscillator Input
Output Frequency Range
DC Parameter - Supply Current
Total Current Consumption:
Powersave mode
Bias only
Operating Tx
Operating Rx
IF/RF Amplifier and Quadrature Demodulator
Performance Figures:
Gain
Noise figure
Third order intercept point (input)
Comprehensive technical datasheet and support material is available from the CML website.
Click here to link to the CML website or search for: CMX973
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Phone:
+44 (0) 1621 875500
+1 336 744 5050
+65 62 888129
800 638 5577
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+1 336 638 5577
+65 62 888230
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