參數(shù)資料
型號(hào)： THS4227DR
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 3 CHANNEL, VIDEO PREAMPLIFIER, PDSO16
封裝： PLASTIC, SOIC-16
文件頁(yè)數(shù)： 9/32頁(yè)
文件大?。?/td> 411K
代理商： THS4227DR
THS4221, THS4225
THS4222, THS4226
THS4223, THS4227
SLOS399C – AUGUST 2002 – REVISED JANUARY 2003
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 25 MHz.
_
+
THS4222
49.9
50
Source
1.3 k
4.7 pF
5 V
–5 V
33 pF
VO
1.3 k
52.3
VI
Figure 34. A Two-Pole Active Filter With Two
Poles Between 90 MHz and 100 MHz
相關(guān)PDF資料
PDF描述
THS4227D 3 CHANNEL, VIDEO PREAMPLIFIER, PDSO16
THS4225DGNRG4 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8
THS4221DGNRG4 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8
THS4226DGQRG4 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO10
THS4221DRG4 1 CHANNEL, VIDEO PREAMPLIFIER, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS4227PWP 制造商:Rochester Electronics LLC 功能描述:- Bulk
THS4271 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW NOISE, HIGH SLEW RATE, UNITY GAIN STABLE VOLTAGE FREEBACK AMPLIFIER
THS4271D 功能描述:高速運(yùn)算放大器 Super-Fast Ultra-Low Distortion RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
THS4271D 制造商:Texas Instruments 功能描述:OP AMP HIGH SPEED VFB 4271 SOIC8
THS4271DG4 功能描述:高速運(yùn)算放大器 Super-Fast Ultra-Low Distortion RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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