參數(shù)資料
型號(hào)： TDA9875
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Digital TV Sound Processor DTVSP
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP64
文件頁(yè)數(shù)： 34/92頁(yè)
文件大小： 279K
代理商： TDA9875
1998 Feb 13
34
Philips Semiconductors
Preliminary specification
Digital TV Sound Processor (DTVSP)
TDA9875
10.3.2
G
ENERAL CONFIGURATION REGISTER
10.3.2.1
Description
Table 13
Description of Table 14
10.3.2.2
Definition
Table 14
Subaddress 1 (note 1)
Note
1.
The default setting at power-up is 11000000.
NAME
HIGH/LOW
FUNCTION
SIFSEL
HIGH
LOW
HIGH
LOW
Selects pin SIF2 for input (recommended for satellite tuner).
Pin SIF1 (terrestrial TV) is selected.
Forces the AGC block to a fixed gain as defined in the AGC gain register.
The automatic gain control function is enabled and the contents of the AGC gain register is
ignored.
A longer decay time and larger hysteresis are selected for input signals with strong video
modulation (intercarrier). This bit only has an effect when bit AGCOFF = 0.
Selects normal attack and decay times for the AGC and a small hysteresis.
Causes initialization of TDA9875 to its default settings. This has the same effect as a
power-on reset. If there is a conflict between the default settings and any bit set HIGH in
this register, the bits of this register have priority over the corresponding default setting.
This bit is automatically reset to LOW after initialization. When set LOW, the TDA9875 is in
its normal mode of operation.
Puts the TDA9875 into the standby mode. Most functions are disabled and power
dissipation is somewhat reduced, but the analog selectors/matrices remain operational to
support analog copying from SCART 1 to SCART 2 and vice versa.
The TDA9875 is in its normal mode of operation. On return from standby mode, the device
is in its power-on reset mode and needs to be re-initialized.
These bits control the general purpose input/output pins. The contents of these bits is
written directly to the corresponding pins. If input is desired, the bits must be set HIGH to
allow the pins to be pulled LOW externally. Input from the pins is reflected in the device
status register (see Section 10.4, subaddress 0). P1OUT is recommended to be used for
switching an SIF trap for the adjacent picture carrier in designs that employ such a trap.
AGCOFF
AGCSLOW
HIGH
LOW
HIGH
INIT
LOW
STDBY
HIGH
LOW
P1OUT,
P2OUT
BIT
NAME
DESCRIPTION
7 (MSB)
6
5
4
3
2
1
0 (LSB)
P2OUT
P1OUT
STDBY
INIT
X
AGCSLOW AGC decay time
AGCOFF
AGC on/off
SIFSEL
SIF input select
general purpose I/O pin 2
general purpose I/O pin 1
stand-by mode on/off
initialize to defaults (as reset)
don’t care
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相關(guān)代理商/技術(shù)參數(shù)
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TDA9875A 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP
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TDA9880 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Alignment-free multistandard vision and FM sound IF-PLL demodulator
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