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參數(shù)資料
| 型號： | TDA9888 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | DVB selective AGC amplifier |
| 中文描述： | AGC放大器的DVB選擇性 |
| 文件頁數(shù)： | 5/22頁 |
| 文件大?。?/td> | 136K |
| 代理商： | TDA9888 |
2004 Nov 02
5
Philips Semiconductors
Product specification
DVB selective AGC amplifier
TDA9888TS; TDA9889TS
PINNING
SYMBOL
PIN
DESCRIPTION
S0
1
logic switch S0 input (frequency
select)
4 MHz crystal or reference input
logic switch S2 input (AGC select)
loop filter synthesizer PLL
loop filter low-pass control PLL
AGC control voltage input
low IF differential output 1
low IF differential output 2
tuner AGC TakeOver Point (TOP)
adjustment
tuner AGC output
external tuner AGC voltage input
supply voltage (+5 V)
logic switch S1 input (frequency
select)
ground supply
IF differential input 1
IF differential input 2
REF
S2
LFS
LFLP
AGC
LIF1
LIF2
TADJ
2
3
4
5
6
7
8
9
TAGC
TAGCEXT
V
P
S1
10
11
12
13
GND
IF1
IF2
14
15
16
handbook, halfpage
TDA9888TS
TDA9889TS
MHC093
1
2
3
4
5
6
7
8
S0
REF
S2
LFS
LFLP
AGC
LIF1
LIF2
IF2
IF1
GND
S1
VP
TAGCEXT
TAGC
TADJ
16
15
14
13
12
11
10
9
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION
Figure 1 shows the simplified block diagram of the device.
The integrated circuit contains the following functional
blocks:
1.
Gain controlled IF amplifier
2.
Tuner AGC
3.
Reference generation
4.
Synthesizer for downconversion
5.
Downconversion and complex filtering
6.
Tracking low-pass filter with reference control
7.
Low IF differential output stage
8.
Logic control
9.
Internal voltage stabilizer.
Gain controlled IF amplifier
The IF amplifier consists of three AC-coupled differential
stages. Gain control is performed by emitter degeneration.
Total gain control range is 70 dB (typ.). The differential
input impedance is typical 2 k
in parallel with 3 pF.
Tuner AGC
The tuner AGC is realized by a TakeOver Point (TOP)
network and a peak-level detector. The threshold level of
the peak detector can be adjusted by an external
potentiometer connected to pin TADJ. For IF signals
above this threshold the level detector provides a
discharge current to pin TAGC. An additional current
source is internally connected to this pin providing charge
current to the external tuner AGC capacitor. For IF signals
of 8 dB below the threshold voltage this current will be
increased by a factor of approximately 40 for faster AGC
reaction. The ratio of discharge to charge current is
normally approximately 2000 and approximately 50 for
fast mode.
For use of the device in different applications the charge
current can be switched off, for hybrid applications the
signal at pin TAGCEXT can be fed via a transmission gate
to pin TAGC (TDA9888TS; TDA9889TS combined with
analog IF), controlled by the 3-state input pin S2. With an
activated transmission gate all internal currents are off.
In the event that the tuner AGC is not needed (e.g. TAGC
from channel decoder or from an analog IF in hybrid
chassis), pin TADJ should be left open-circuit and
therefore all internal AGC currents will be switched off.
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PDF描述 |
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| TDA9889 | DVB selective AGC amplifier |
| TDA9889TS | DVB selective AGC amplifier |
| TDA9888TS | DVB selective AGC amplifier |
| TDA9901 | Wideband differential digital controlled variable gain amplifier(寬帶差分?jǐn)?shù)控可變增益放大器) |
| TDA9901TS | Wideband differential digital controlled variable gain amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA9888TS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DVB selective AGC amplifier |
| TDA9889 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DVB selective AGC amplifier |
| TDA9889TS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DVB selective AGC amplifier |
| TDA9889TS/V1,512 | 功能描述:射頻放大器 DVB T AFRIC DOWN CONVERSION RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點(diǎn):37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
| TDA9889TS/V1,518 | 功能描述:射頻放大器 DVB T AFRIC DOWN CONVERSION RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點(diǎn):37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
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