User Manual
i
STEL-2176
TABLE OF CONTENTS
PARAGRAPH
PAGE
KEY FEATURES.....................................................................................................................................
1
RECEIVER...........................................................................................................................................
1
TRANSMITTER ...................................................................................................................................
1
INTRODUCTION ..................................................................................................................................
2
RECEIVER OVERVIEW........................................................................................................................
2
TRANSMITTER OVERVIEW ................................................................................................................
2
MECHANICAL SPECIFICATIONS ........................................................................................................
3
208-PIN SQFP PACKAGE.....................................................................................................................
3
ELECTRICAL SPECIFICATIONS ........................................................................................................
8
RECEIVER .............................................................................................................................................
10
OVERVIEW.........................................................................................................................................
10
FUNCTIONAL BLOCKS ......................................................................................................................
11
ADC..............................................................................................................................................
11
Microcontroller Interface.................................................................................................................
11
Master Receive Clock Generator......................................................................................................
12
QAM Demodulator Blocks..............................................................................................................
13
FEC Decoder Blocks .......................................................................................................................
14
RECEIVE AND UNIVERSAL REGISTER DESCRIPTIONS ....................................................................
20
PROGRAMMING THE 2176 RECEIVE FUNCTIONS .............................................................................
20
REGISTER DESCRIPTIONS..................................................................................................................
20
Bank 0 - Universal Registers (Group 1).............................................................................................
20
Bank 0 - QAM Demodulator Registers Universal Registers (Group 2) ................................................
22
Bank 1 - FEC Registers (Group 3).....................................................................................................
30
TIMING.................................................................................................................................................
35
NO GAP, PARALLEL MODE ...............................................................................................................
35
NO GAP, SERIAL MODE .....................................................................................................................
35
GAPS, PARALLEL MODE....................................................................................................................
35
GAPS, SERIAL MODE .........................................................................................................................
35
TRANSMITTER.....................................................................................................................................
39
INTRODUCTION ................................................................................................................................
39
FUNCTIONAL BLOCK DIAGRAM DESCRIPTIONS .............................................................................
39
DATA PATH DESCRIPTION ...............................................................................................................
39
Bit SYNC Block ..............................................................................................................................
39
Bit Encoder Block ...........................................................................................................................
41
Symbol Mapper Block.....................................................................................................................
45
Nyquist FIR Filter...........................................................................................................................
50
Interpolating Filter .........................................................................................................................
50
Modulator .....................................................................................................................................
51
10-Bit DAC.....................................................................................................................................
52
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