TDA8046 Datasheet, PDF (21/48 Pages) NXP Semiconductors – Multi-mode QAM demodulator

Philips Semiconductors
Multi-mode QAM demodulator
Product specification
TDA8046
handbook, full pagewidth
B quadrant
Q
A quadrant
b5 b4 b3 b2
1010 1011 1001 1000 0010 0110 1110 1010
1110 1111 1101 1100 0011 0111 1111 1011
0110 0111 0101 0100 0001 0101 1101 1001
0010 0011 0001 0000 0000 0100 1100 1000
I
1000 1100 0100 0000 0000 0001 0011 0010
1001 1101 0101 0001 0100 0101 0111 0110
1011 1111 0111 0011 1100 1101 1111 1110
1010 1110 0110 0010 1000 1001 1011 1010
C quadrant
D quadrant
MGG183
Bit allocation for 4-QAM: b5 = b4 = b3 = b2 = b1 = b0 = 0; b7 and b6 differentially decoded (see Table 3).
Bit allocation for 64-QAM: b5, b4, b3 and b2; b0 = b1 = 0; b7 and b6 differentially decoded (see Table 3).
Fig.18 Demapping scheme 1; bit allocation: 4-QAM and 64-QAM.
handbook, full pagewidth
B quadrant ^Q A quadrant ^{b5 b4}
11
10
01
11
01
00
00
10
I
10
00
00
01
11
01
10
11
C quadrant
D quadrant
MGG184
Bit allocation for 16-QAM: b5 and b4; b3 = b2 = b1 = b0 = 0; b7 and b6 differentially decoded (see Table 3).
Bit allocation for 32-QAM: not implemented.
Fig.19 Demapping scheme 1; bit allocation: 16-QAM and 32-QAM.
1996 Nov 19
21