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| 型號(hào)： | THS4275MDGNTEP |
| 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： | PLASTIC, MSOP-8 |
| 文件頁(yè)數(shù)： | 15/39頁(yè) |
| 文件大?。?/td> | 915K |
| 代理商： | THS4275MDGNTEP |
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THS4271EP
THS4275EP
SGLS270B DECEMBER 2004 REVISED JULY 2008
www.ti.com
22
APPLICATION CIRCUITS
Driving an Analog-to-Digital Converter With the
THS4271
The THS4271 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
THS4271
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 100 MHz. For applications
without signal content at dc, this method of driving ADCs
can be useful. Where dc information content is required,
the THS4500 family of fully differential amplifiers may be
applicable.
_
+
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
Figure 79. 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.
_
+
THS4271
249
ADS807
12-Bit,
53 Msps
Rf
+5 V
249
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 the best performance, high-speed ADCs should be driven
differentially. See the THS4500 family of devices for more
information.
Figure 80. Driving an ADC With a
Single-Ended Input
Using the THS4271 as a DAC Output Buffer
Two example circuits are presented here showing the
THS4271 buffering the output of a digital-to-analog
converter. The first circuit performs a differential to
single-ended conversion with the THS4271 configured as
a difference amplifier. The difference amplifier can double
as the termination mechanism for the DAC outputs as well.
249
_
+
THS4271
49.9
100
249
100
+5 V
5 V
14-Bit,
400 MSps
DAC5675
RF
LO
124
249
249
3.3 V
Figure 81. Differential to Single-Ended
Conversion of a High-Speed DAC Output
For cases where a differential signaling path is desirable,
a pair of THS4271 amplifiers can be used as output
buffers. The circuit depicts differential drive into a mixer’s
IF inputs, coupled with additional signal gain and filtering.
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| THS4281 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:VERY LOW-POWER, HIGH-SPEED, RAIL-TO-RAIL INPUT AND OUTPUT VOLTAGE-FEEDBACK OPERATIONAL AMPLIFIER |
| THS4281D | 功能描述:高速運(yùn)算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback 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 |
| THS4281DBVR | 功能描述:高速運(yùn)算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback 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 |
| THS4281DBVRG4 | 功能描述:高速運(yùn)算放大器 Very Lo-Pwr R-To-R I/O Voltage Feedback 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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