CMX983 Datasheet, PDF (3/93 Pages) CML Microcircuits – Programmable Channel Filter

Analogue Front End (AFE) for Digital Radio
CMX983
Section
CONTENTS
Page
1
Brief Description ..................................................................................................... 2
2
Block Diagram ........................................................................................................ 7
3
General Description ............................................................................................... 8
4
Pin and Signal List ................................................................................................. 9
5
External Components........................................................................................... 13
6
C-BUS Interface ................................................................................................... 16
6.1 C-BUS Operation........................................................................................... 16
6.2 C-BUS Register Details ................................................................................. 18
6.3 C-BUS General Reset ................................................................................... 19
6.4 C-BUS Status and Interrupt ........................................................................... 20
7
Bias Generator ..................................................................................................... 22
8
System Clock Generator ...................................................................................... 23
9
Receive Channel.................................................................................................. 26
9.1 Rx Signal Routing and ADCs ........................................................................ 26
9.2 Receive Channel Filters ................................................................................ 29
10 Transmit Channel................................................................................................. 37
11 Serial Ports........................................................................................................... 44
11.1 Rx Serial Port ................................................................................................ 44
11.2 Tx Serial Port ................................................................................................. 47
12 Fractional-N Frequency Synthesizers.................................................................. 49
12.1 Register Loading Order ................................................................................. 57
12.2 Fractional-N Programming Examples ........................................................... 57
12.3 Lock Detector Configuration Guidelines ........................................................ 58
12.3.1 Digital Lock Detector ............................................................................... 59
12.3.2 Analogue Lock Detector.......................................................................... 60
13 Auxiliary ADC and Comparators .......................................................................... 63
13.1 Auxiliary ADC ................................................................................................ 64
13.2 Auxiliary Comparators ................................................................................... 70
14 Auxiliary DACs ..................................................................................................... 72
15 Performance Specification ................................................................................... 76
15.1 Absolute Maximum Ratings........................................................................... 76
15.2 Operating Limits ............................................................................................ 76
15.3 Operating Characteristics .............................................................................. 77
15.4 Timing Diagrams ........................................................................................... 83
 2015 CML Microsystems Plc
3
D/983/6