參數(shù)資料
型號(hào)： 935263704518
廠商： NXP SEMICONDUCTORS
元件分類： 接收器
英文描述： AM/FM, AUDIO DEMODULATOR, PQFP44
封裝： PLASTIC, QFP-44
文件頁數(shù)： 14/71頁
文件大小： 304K
代理商： 935263704518
2000 Aug 04
21
Philips Semiconductors
Product specication
Digital TV sound demodulator/decoder
TDA9874A
7.3.2
AGC GAIN REGISTER (AGCGR)
If the AGC function is switched off in the general
configuration register (see Section 7.3.3), 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
AGC gain setting is ignored. After switching off the AGC
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 bit AGCLEV is also
active if the AGC function is enabled.
The default setting after Power-on reset is 0000 0000.
In Table 14 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 12 AGC gain register (subaddress 0)
Table 13 Description of the AGC gain register bits
76543210
0
AGCLEV
AGCB4
AGCB3
AGCB2
AGCB1
AGCB0
BIT
NAME
DESCRIPTION
7
this bit is not used and should be set to a logic 0
6
this bit is not used and should be set to a logic 0
5
AGCLEV
If the AGC input level shift bit AGCLEV = 1 the input signal is scaled with
10 dB.
Bit AGCLEV is also active if the automatic gain function is enabled.
4
AGCB4
If the automatic gain control function is switched off in the general conguration register,
the contents of this register will dene a xed gain of the AGC stage.
3
AGCB3
2
AGCB2
1
AGCB1
0
AGCB0
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