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| TDA8046 Datasheet, PDF (20/48 Pages) NXP Semiconductors – Multi-mode QAM demodulator | |||
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Philips Semiconductors
Multi-mode QAM demodulator
Product speciï¬cation
TDA8046
handbook, full pagewidth
8
I
8
Q
I2C-BUS
DEMAPPING
SCHEMES
1 to 4
MUX
PARALLEL
AND
SEMI-SERIAL
MGG175
DO7 to DO0
CLKSCV
DO1 to DO0
CLKSCV
CLKOUT
DO7 to DO0
CLKSCV
CLKOUT
Fig.16 Schematic diagram of the output formatter.
7.1.10.1 Demapping scheme 1; differential decoding
handbook, full pagewidth
Q
A quadrant
b5 b4 b3 b2 b1 b0
000100 001100 011100 010100 110100 111100 101100 100100
000101 001101 011101 010101 110101 111101 101101 100101
000111 001111 011111 010111 110111 111111 101111 100111
000110 001110 011110 010110 110110 111110 101110 100110
000010 001010 011010 010010 110010 111010 101010 100010
000011 001011 011011 010011 110011 111011 101011 100011
000001 001001 011001 010001 110001 111001 101001 100001
000000 001000 011000 010000 110000 111000 101000 100000
I
MGG193
Bit allocation for 256-QAM: b5, b4, b3, b2, b1 = b0 = 0; b7 and b6 differentially decoded (see Table 3).
Fig.17 Demapping scheme 1; bit allocation: 256-QAM.
1996 Nov 19
20
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