CMX970 Demodulator Datasheet

CMX970 Datasheet, PDF, Equivalent


Part Number

CMX970

Description

IF/RF Quadrature Demodulator

Manufacture

CML

Total Page 30 Pages
Datasheet
Download CMX970 Datasheet


CMX970
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CMX970
IF/RF Quadrature
Demodulator
D/970/7 February 2015
Features
20 300 MHz IF/RF Demodulator
10MHz I/Q Bandwidth
Serial Bus or Direct Control Operation
Variable Gain and DC Offset Adjustments
Low Power 3.0V 3.6V Operation
Small 16-lead VQFN Package
Provisional Issue
Applications
Wireless Data Terminals
HF/VHF and UHF Mobile Radio
Avionics Radio Systems
N/C LO LOGND CBUSOFFN
RFGND
RFIN
VCC
RXIP
Gain
Divide
2/4
Gain
VSS
CSN/
GAIN
SCLK/
DIVSET
CDATA/
RESETN
RXIN
RXQP
RXQN
VDD
1 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 by direct control (with reduced functionality). The small, RF-optimised VQFN
package and minimal external components make the device ideal for space-constrained applications.
2015 CML Microsystems Plc

CMX970
IF/RF Quadrature Demodulator
CMX970
CONTENTS
Section
Page
1 Brief Description .................................................................................................. 1
2 Block Diagram ...................................................................................................... 4
3 Pin and Signal List ............................................................................................... 5
3.1 Main Functions ................................................................................................ 5
3.2 Direct Control Functions .................................................................................. 5
4 External Components .......................................................................................... 6
4.1 Power Supply Decoupling................................................................................ 6
4.2 Quadrature Demodulator ................................................................................. 7
4.3 Local Oscillator (LO) Input ............................................................................... 7
5 General Description ............................................................................................. 8
5.1 Programmable Data Interface ......................................................................... 8
5.2 Quadrature Demodulator ................................................................................. 8
5.2.1 I/Q Amplitude and Phase Correction......................................................... 9
5.2.2 DC Offset Correction............................................................................... 11
5.3 Local Oscillator (LO) ...................................................................................... 11
6 C-BUS Interface and Register Description ...................................................... 12
6.1 General Reset Command .............................................................................. 13
6.1.1 General Reset Command C-BUS address $1A...................................... 13
6.2 General Control Register ............................................................................... 13
6.2.1 General Control Register: C-BUS address $1B ...................................... 13
6.3 Control Register ............................................................................................. 14
6.3.1 Control Register: C-BUS address $1C.................................................... 14
6.4 Mode Register ............................................................................................... 15
6.4.1 Mode Register: C-BUS address $1D ...................................................... 15
6.5 Offset Register............................................................................................... 16
6.5.1 Offset Register: C-BUS address $1F ...................................................... 16
6.6 Intermod Control Register.............................................................................. 17
6.6.1 Intermod Control Register: C-BUS address $2F..................................... 17
7 Direct Control Option......................................................................................... 18
8 Application Notes............................................................................................... 20
8.1 IF/RF Input Matching ..................................................................................... 20
8.2 Receiver Intermodulation and Output Drive Capability .................................. 21
8.3 Receiver Variation with Temperature ............................................................ 22
8.4 Effect of Gain Control on Receiver Performance .......................................... 23
8.5 Measurement of CMX970 Demodulator Intermodulation Performance ........ 25
8.6 Operation with large input signals.................................................................. 26
9 Performance Specification ................................................................................ 27
9.1 Electrical Performance................................................................................... 27
9.1.1 Absolute Maximum Ratings .................................................................... 27
9.1.2 Operating Limits ...................................................................................... 27
9.1.3 Operating Characteristics........................................................................ 28
9.2 Packaging ...................................................................................................... 32
2015 CML Microsystems Plc
2
D/970/7


Features CML Microcircuits COMMUNICATION SEMICOND UCTORS CMX970 IF/RF Quadrature Demodul ator D/970/7 February 2015 Features 20 – 300 MHz IF/RF Demodulator  10MHz I/Q Bandwidth  Serial Bus or D irect Control Operation  Variable Ga in and DC Offset Adjustments  Low Po wer 3.0V – 3.6V Operation  Small 1 6-lead VQFN Package Provisional Issue Applications  Wireless Data Terminal s  HF/VHF and UHF Mobile Radio  A vionics Radio Systems N/C LO LOGND CBU SOFFN RFGND RFIN VCC RXIP Gain Divid e 2/4 Gain CBUS logic VSS CSN/ GAIN S CLK/ DIVSET CDATA/ RESETN RXIN RXQP RXQN VDD 1 Brief Description The CMX 970 is a low power IF or RF quadrature demodulator featuring a wide operating frequency range and low power consumpti on. Suitable for architectures with IF or RF frequencies up to 300MHz the devi ce may be used in low IF systems or tho se converting down to baseband. Control of the CMX970 may be either by serial bus or by direct control (with reduced functionality). The small, RF-optimised VQFN p.
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