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參數資料
| 型號： | THS4221DGK |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MSOP-8 |
| 文件頁數： | 9/38頁 |
| 文件大小： | 1219K |
| 代理商： | THS4221DGK |
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THS4221, THS4225
THS4222, THS4226
SLOS399G AUGUST 2002 REVISED JANUARY 2004
www.ti.com
17
APPLICATION CIRCUITS
Driving an Analog-to-Digital Converter With the
THS4222
The THS4222 can be used to drive high-performance
analog-to-digital converters. Two example circuits are
presented below.
The first circuit uses a wideband transformer to convert a
single-ended input signal into a differential signal. The
differential signal is then amplified and filtered by two
THS4222
amplifiers.
This
circuit
provides
low
intermodulation
distortion,
suppressed
even-order
distortion, 14 dB of voltage gain, a 50- input impedance,
and a single-pole filter at 25 MHz. For applications without
signal content at dc, this method of driving ADCs can be
very useful. Where dc information content is required, the
THS4500 family of fully differential amplifiers may be
applicable.
_
+
THS4222
50
Source
1.3 k
_
+
THS4222
5 V
649
4.7 pF
1.3 k
649
24.9
4.7 pF
12-Bit, 53 Msps
ADS807
(1:4 )
1:2
5 V
24.9
237
Figure 32. A Linear, Low Noise, High Gain ADC
Preamplifier
The second circuit depicts single-ended ADC drive. While
not recommended for optimum performance using
converters
with
differential
inputs,
satisfactory
performance
can
sometimes
be
achieved
with
single-ended input drive. An example circuit is shown here
for reference.
_
+
THS4222
1.3 k
ADS807
12-Bit,
53 Msps
Rf
+5 V
1.3 k
49.9
VI
Rg
5 V
50
Source
RISO 0.1 F
16.5
68 pf
0.1 F
IN
CM
1.82 k
RT
NOTE: For best performance, high-speed ADCs should be driven
differentially. See the THS4500 family of devices for more
information.
Figure 33. Driving an ADC With a
Single-Ended Input
Active Filtering With the THS4222
High-frequency active filtering with the THS4222 is
achievable due to the amplifier’s high slew rate, wide
bandwidth, and voltage feedback architecture. Several
options are available for high-pass, low-pass, bandpass,
and bandstop filters of varying orders. A simple two-pole
low pass filter is presented here as an example, with two
poles at about 25 MHz.
_
+
THS4222
49.9
50 Source
1.3 k
4.7 pF
5 V
120 pF
VO
1.3 k
52.3
VI
Figure 34. A Two-Pole Active Filter With Two
Poles at about 25 MHz
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相關代理商/技術參數 |
參數描述 |
|---|---|
| THS4221DGKG4 | 功能描述:高速運算放大器 Low-Distortion High Speed R-to-R Output RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4221DGKR | 功能描述:高速運算放大器 Low-Distortion High Speed R-to-R Output RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4221DGKRG4 | 功能描述:高速運算放大器 Low-Distortion High Speed R-to-R Output RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4221DGN | 功能描述:高速運算放大器 Low-Distortion High Speed R-to-R Output RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4221DGNG4 | 功能描述:高速運算放大器 Low-Distortion High Speed R-to-R Output RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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