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參數資料
| 型號： | THS4271DRBR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | EXPOSED PAD, LEADLESS, PLASTIC, MSOP-8 |
| 文件頁數： | 16/48頁 |
| 文件大小： | 1227K |
| 代理商： | THS4271DRBR |
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_
+
THS4271
50
Source
249
_
+
-5 V
100
22 pF
249
100
24.9
22 pF
14-Bit, 62 Msps
ADS5422
(1:4
)
1:2
5 V
24.9
THS4271
VCM
www.ti.com
SLOS397F – JULY 2002 – REVISED OCTOBER 2009
Table 3. Power-Down Threshold Voltage Levels
A 100-pF capacitor can be used across the
(REF > MIDRAIL)
supplies as well for extremely high-frequency
return currents, but often is not required.
SUPPLY
REFERENCE
ENABLE
DISABLE
VOLTAGE
PIN VOLTAGE
LEVEL
(V)
APPLICATION CIRCUITS
Floating or 5
≥ 4
≤ 3.3
Driving an Analog-to-Digital Converter With the
±5
2.5
≥ 1.5
≤ 0.8
THS4271
1
≥ 0
≤ -0.7
The THS4271 can be used to drive high-performance
Floating or 5
≥ 3.3
≤ 3.3
analog-to-digital converters. Two example circuits are
5
4
≥ 3
≤ 2.3
presented below.
3.5
≥ 2.5
≤ 1.8
The first circuit uses a wideband transformer to
In Table 3, the threshold levels are derived by the
convert a single-ended input signal into a differential
following equations:
signal. The differential signal is then amplified and
filtered by two THS4271 amplifiers. This circuit
REF - 1 V for enable
provides low intermodulation distortion, suppressed
REF - 1.7 V for disable
even-order distortion, 14 dB of voltage gain, a 50-
Note that in order to maintain these threshold levels,
input impedance, and a single-pole filter at 100 MHz.
the reference pin can be any voltage between (VS+/2)
For applications without signal content at dc, this
+ 1 V to VS+.
method of driving ADCs can be very useful. Where dc
information content is required, the THS4500 family
The recommended mode of operation is to tie the
of fully differential amplifiers may be applicable.
reference pin to midrail, thus setting the threshold
levels to midrail +1 V and midrail +1.8 V.
NO. OF CHANNELS
PACKAGES
THS4275D, THS4275DGN, and
Single (8-pin)
THS4275DRB
Power-Supply Decoupling Techniques and
Recommendations
Power-supply decoupling is a critical aspect of any
high-performance amplifier design process. Careful
decoupling provides higher quality ac performance
(most notably improved distortion performance). The
following guidelines ensure the highest level of
performance.
1. Place decoupling capacitors as close to the
power-supply inputs as possible, with the goal of
minimizing the inductance of the path from
ground to the power supply.
2. Placement priority should put the smallest valued
Figure 78. A Linear, Low-Noise, High-Gain
capacitors closest to the device.
ADC Preamplifier
3. Use of solid power and ground planes is
recommended to reduce the inductance along
The second circuit depicts single-ended ADC drive.
power-supply return current paths, with the
While not recommended for optimum performance
exception of the areas underneath the input and
using converters with differential inputs, satisfactory
output pins.
performance
can
sometimes
be
achieved
with
4. Recommended
values
for
power-supply
single-ended input drive. An example circuit is shown
decoupling include a bulk decoupling capacitor
here for reference.
(6.8
μF to 22 μF), a mid-range decoupling
capacitor
(0.1
μF)
and
a
high
frequency
decoupling capacitor (1000 pF) for each supply.
Copyright 2002–2009, Texas Instruments Incorporated
23
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| THS4271DGKR | 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| THS4271DRBRG4 | 功能描述:高速運算放大器 Super-Fast Ultra-Low Distortion 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 |
| THS4271DRBT | 功能描述:高速運算放大器 Super-Fast Ultra-Low Distortion 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 |
| THS4271DRBTG4 | 功能描述:高速運算放大器 Super-Fast Ultra-Low Distortion 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 |
| THS4271DRG4 | 功能描述:高速運算放大器 Super-Fast Ultra-Low Distortion 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 |
| THS4271-EP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW NOISE, HIGH SLEW RATE, UNITY GAIN STABLE VOLTAGE FEEDBACK AMPLIFIER |
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