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參數(shù)資料
| 型號： | TDA9874AH |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | Digital TV sound demodulator/decoder |
| 中文描述： | AM/FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | 14 X 14 MM, 2.20 MM HEIGHT, PLASTIC, SOT-205-1, QFP-44 |
| 文件頁數(shù)： | 29/68頁 |
| 文件大?。?/td> | 231K |
| 代理商： | TDA9874AH |
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1999 Dec 03
29
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874A
10.3.2
AGC G
AIN
R
EGISTER
(AGCGR)
If the Automatic Gain Control (AGC) function is switched off in the general configuration register (see Section 10.3.3) 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 HIGH the input signal is scaled with
10 dB. The AGCLEV bit is also active if the AGC function is enabled.
The default setting after power-on reset is ‘0000 0000’.
InTable 16thestated stepnumber corresponds with theSIFlevel readfromsubaddress 7(see Section 10.4.6);the input
voltages should be considered as approximate target values.
Table 14
AGC gain register (subaddress 0)
Table 15
Description of the AGCGR bits
7
6
5
4
3
2
1
0
0
0
AGCLEV
AGCB4
AGCB3
AGCB2
AGCB1
AGCB0
BIT
NAME
AGCLEV
DESCRIPTION
7
6
5
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 is set to HIGH the input signal is scaled with
10 dB. The AGCLEV bit 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.
4
3
2
1
0
AGCB4
AGCB3
AGCB2
AGCB1
AGCB0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA9874AH/V2,557 | 功能描述:音頻放大器 DIGITAL STEREO DECODER VCR RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA9874AHB | 功能描述:音頻放大器 DIGITAL STEREO DECODER VCR RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA9874APS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV sound demodulator/decoder |
| TDA9874H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV sound demodulator/decoder |
| TDA9875 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV Sound Processor DTVSP |
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