TDA9874AH/V2,557 NXP Semiconductors, TDA9874AH/V2,557 Datasheet - Page 21
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TDA9874AH/V2,557
Manufacturer Part Number
TDA9874AH/V2,557
Description
IC SOUND DEMOD/DECODE 44PQFP
Manufacturer
NXP Semiconductors
Type
Demodulatorr
Datasheet
1.TDA9874AHV2557.pdf
(68 pages)
Specifications of TDA9874AH/V2,557
Applications
TV
Mounting Type
Surface Mount
Package / Case
44-QFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
935263704557
TDA9874AHB
TDA9874AHB
TDA9874AHB
TDA9874AHB
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
TDA9874AH/V2,557
Manufacturer:
NXP Semiconductors
Quantity:
10 000
Philips Semiconductors
7.3.2
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.
Table 12 AGC gain register (subaddress 0)
Table 13 Description of the AGC gain register bits
2000 Aug 04
Digital TV sound demodulator/decoder
BIT
7
0
7
6
5
4
3
2
1
0
AGC G
AIN
AGCLEV
AGCB4
AGCB3
AGCB2
AGCB1
AGCB0
NAME
R
EGISTER
6
0
(AGCGR)
this bit is not used and should be set to a logic 0
this bit is not used and should be set to a logic 0
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.
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.
AGCLEV
5
AGCB4
4
21
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.
AGCB3
3
DESCRIPTION
AGCB2
2
AGCB1
1
Product specification
TDA9874A
AGCB0
0