RF Quadrature Transceiver / RF Quadrature Receiver
CMX991/CMX992
CONTENTS
Section
Page
1
Brief Description ..................................................................................................1
1.1
3.1
History..............................................................................................................6
2
3
Block Diagrams ....................................................................................................7
Pin List ..................................................................................................................8
Signal Definitions .............................................................................................9
4
External Components........................................................................................10
Power Supply Decoupling..............................................................................10
Receiver (CMX991 and CMX992) .................................................................11
Transmitter (CMX991 only)............................................................................15
Main Local Oscillator .....................................................................................16
IF Local Oscillator (CMX991 and CMX992)...................................................17
4.1
4.2
4.3
4.4
4.5
5
General Description ...........................................................................................19
Overview........................................................................................................19
Receiver.........................................................................................................19
Transmitter (CMX991 only)............................................................................21
Local Oscillators ............................................................................................22
VBIAS ...............................................................................................................24
Data Interface ................................................................................................24
5.1
5.2
5.3
5.4
5.5
5.6
6
C-BUS Interface and Register Description ......................................................25
General Reset Command (CMX991/CMX992) .............................................27
General Control Register (CMX991/CMX992)...............................................27
Rx Control Register (CMX991/CMX992).......................................................28
Rx Mode Register (CMX991/CMX992)..........................................................29
Tx Control Register (CMX991 only)...............................................................30
Tx Mode Register (CMX991 only) .................................................................31
Tx Gain Register (CMX991 only)...................................................................31
IF PLL M Divider (CMX991/CMX992)............................................................32
PLL N Divider (CMX991/CMX992) ................................................................33
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
7
Application Notes...............................................................................................34
General..........................................................................................................34
Using the CMX992 with the CMX998 ............................................................34
Receiver Gain Issues.....................................................................................34
Oscillator Components for Alternative Intermediate Frequencies. ................35
RF Mixer Input Matching................................................................................36
RF Mixer IF Output Matching.........................................................................36
IF Input Matching...........................................................................................37
Signal Level Indicator (SLI)............................................................................39
Receiver Spurious Rejection Performance....................................................41
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
7.11
7.12
Receiver I/Q Filters........................................................................................42
Modulation Accuracy......................................................................................42
Post I/Q Modulator Filter................................................................................44
8
Performance Specification................................................................................47
Electrical Performance...................................................................................47
Packaging......................................................................................................56
8.1
8.2
2012 CML Microsystems Plc
3
D/991_992/18
CMLMICRO [ CML MICROCIRCUITS ]
