CMX991 Datasheet, PDF (3/56 Pages) CML Microcircuits – Two-mode demodulator

RF Quadrature Transceiver / RF Quadrature Receiver
CMX991/CMX992
CONTENTS
Section
Page
1
Brief Description .................................................................................................. 1
1.1 History.............................................................................................................. 6
2
Block Diagrams .................................................................................................... 7
3
Pin List .................................................................................................................. 8
3.1 Signal Definitions ............................................................................................. 9
4
External Components ........................................................................................ 10
4.1 Power Supply Decoupling .............................................................................. 10
4.2 Receiver (CMX991 and CMX992) ................................................................. 11
4.3 Transmitter (CMX991 only)............................................................................ 15
4.4 Main Local Oscillator ..................................................................................... 16
4.5 IF Local Oscillator (CMX991 and CMX992)................................................... 17
5
General Description ........................................................................................... 19
5.1 Overview ........................................................................................................ 19
5.2 Receiver......................................................................................................... 19
5.3 Transmitter (CMX991 only)............................................................................ 21
5.4 Local Oscillators ............................................................................................ 22
5.5 V_BIAS ............................................................................................................... 24
5.6 Data Interface ................................................................................................ 24
6
C-BUS Interface and Register Description ...................................................... 25
6.1 General Reset Command (CMX991/CMX992) ............................................. 27
6.2 General Control Register (CMX991/CMX992)............................................... 27
6.3 Rx Control Register (CMX991/CMX992) ....................................................... 28
6.4 Rx Mode Register (CMX991/CMX992).......................................................... 29
6.5 Tx Control Register (CMX991 only) ............................................................... 30
6.6 Tx Mode Register (CMX991 only) ................................................................. 31
6.7 Tx Gain Register (CMX991 only) ................................................................... 31
6.8 IF PLL M Divider (CMX991/CMX992)............................................................ 32
6.9 PLL N Divider (CMX991/CMX992) ................................................................ 33
7
Application Notes ............................................................................................... 34
7.1 General .......................................................................................................... 34
7.2 Using the CMX992 with the CMX998 ............................................................ 34
7.3 Receiver Gain Issues..................................................................................... 34
7.4 Oscillator Components for Alternative Intermediate Frequencies. ................ 35
7.5 RF Mixer Input Matching................................................................................ 36
7.6 RF Mixer IF Output Matching......................................................................... 36
7.7 IF Input Matching ........................................................................................... 37
7.8 Signal Level Indicator (SLI)............................................................................ 39
7.9 Receiver Spurious Rejection Performance.................................................... 41
7.10 Receiver I/Q Filters ........................................................................................ 42
7.11 Modulation Accuracy...................................................................................... 42
7.12 Post I/Q Modulator Filter ................................................................................ 44
7.13 Variation in I/Q dc Offset with Temperature .................................................. 46
8
Performance Specification ................................................................................ 47
8.1 Electrical Performance................................................................................... 47
8.2 Packaging ...................................................................................................... 56
 2015 CML Microsystems Plc
3
D/991_992/20