tda9874h NXP Semiconductors, tda9874h Datasheet - Page 18

• Manufacturer Part Number: tda9874h
• Description: Digital Tv Sound Demodulator/decoder
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.3.1
If the AGC function is switched off in the general configuration register (see Section 7.3.2), the contents of this register
defines a fixed gain of the SIF input stage. The input voltages given are meant to generate a nearly full-scale output from
the SIF ADC. If the AGC is on, the content of this register is ignored. The default setting at power-up is 0000 0000.
In Table 11 the stated step number corresponds with the SIF level read from subaddress 7 (see Section 7.4.6); the input
voltages should be considered as approximate target values.
Table 11 AGC gain register (subaddress 0)
2000 Jun 26
Digital TV sound demodulator/decoder
B7
7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
AGC
B6
6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
GAIN REGISTER
B5
5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
B4
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
B3
3
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
B2
2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
18
B1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
B0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
STEP
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SIF INPUT VOLTAGE
Product specification
[mV (RMS)]
TDA9874H
240
214
195
176
159
145
131
119
107
99
90
82
76
70
65
60
55
51
48
45
42
39
36
34
32
30
29
27
25
24
23
22