tda9870ah NXP Semiconductors, tda9870ah Datasheet - Page 33

• Manufacturer Part Number: tda9870ah
• Description: Digital Tv Sound Processor Dtvsp
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Note
1. These bits have not been assigned to a function.
The following sub-sections provide a detailed description of the slave receiver registers.
10.3.1
If the automatic gain control function is switched off in the general configuration register, the contents of this register will
define a fixed gain of the AGC stage. The input voltages given are meant to generate a full-scale output from the SIF
ADC. If automatic gain control is on, the AGCGAIN setting is ignored. After switching off the automatic gain control
function, the latest gain control setting is copied to the AGC gain register.
If the AGC input level shift bit AGCLEV is set to logic 1 the input signal is scaled with 10 dB. The AGCLEV bit is also
active if the automatic gain function is enabled.
It should be noted that the input voltages should be considered as approximate target values.
Table 13 Subaddress 0 (note 1)
Note
1. The default setting at power-up is 00000000.
1999 Dec 20
7 (MSB)
Digital TV Sound Processor (DTVSP)
0 (LSB)
SUBADDRESS
BIT
(DECIMAL)
6
5
4
3
2
1
AGC
38
39
40
41
42
43
44
45
AGCGAIN
GAIN REGISTER
AGCLEV
NAME
B7
B6
MSB
0
0
0
0
0
0
0
b
VALUE
0
0
1
0
m
0
0
0
0
0
0
b
m
0
0
0
0
0
v
b
set to logic 0
set to logic 0
input signal scaled with 10 dB
input signal not scaled
gain control bits (see Table 14).
m
o
o
0
b
v
i
i
DATA
o
0
o
0
b
v
i
i
33
o
s
o
v
b
f
i
i
o
o
b
s
v
i
i
f
DESCRIPTION
LSB
o
s
o
v
b
f
i
i
I
beeper frequency
beeper volume, Main and Auxiliary
bass boost, Main left and right
I
I
I
I
2
2
2
2
2
S1 input level adjust
S1 output level adjust
S2 output select
S2 input level adjust
S2 output level adjust
FUNCTION
Product specification
TDA9870A