TDA8046 Datasheet, PDF (23/48 Pages) NXP Semiconductors – Multi-mode QAM demodulator

Philips Semiconductors
Multi-mode QAM demodulator
Product specification
TDA8046
handbook, full pagewidth
000
001
010
Q
011 100
101
110
b7 b6 b5
b3
b2
111
b1
111
110
101
100
I
011
010
001
000
MGG185
Bit allocation for 64-QAM: b7, b6, b5, b3, b2, b1; b4 = b0 = 0.
Bit allocation for 32-QAM: not implemented.
Fig.21 Demapping scheme 2; bit allocation: 64-QAM and 32-QAM.
handbook, full pagewidth
Q
b7
b3
0
1
1
I
0
b7 b6
Q
b3
00
01
10
11
b2
11
10
I
01
00
MGG186
a. Bit allocation for 4-QAM: b7 and b3; b6 = b5 = b4 = b2 = b1 = b0 = 0. b. Bit allocation for 16-QAM: b7, b6, b3 and b2; b5 = b4 = b1 = b0 = 0.
Fig.22 Demapping scheme 2; bit allocation: 4-QAM and 16-QAM.
1996 Nov 19
23