- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄359289 > THS4302RGTR (Texas Instruments, Inc.) WIDEBAND FIXED-GAIN AMPLIFIER PDF資料下載
參數(shù)資料
| 型號： | THS4302RGTR |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 運算放大器 |
| 英文描述： | WIDEBAND FIXED-GAIN AMPLIFIER |
| 中文描述： | 寬頻帶固定增益放大器 |
| 文件頁數(shù)： | 14/23頁 |
| 文件大小： | 602K |
| 代理商： | THS4302RGTR |
www.ti.com
APPLICATION CIRCUITS
Driving an Analog-to-Digital Converter With the
THS4302
_
+
THS4302
R
f
100
49.9
V
I
+
22
μ
F
47 pF
0.1
μ
F
V
S+
50-
Source
R
g
V
O
30.1
FB
FB = Ferrite Bead
* = Low Impedance
*2.5 V
*2.5 V
ADS5422
14-Bit, 63 Msps
R
ISO
0.1
μ
F
24.9
_
+
THS4302
R
f
49.9
V
I
+
22
μ
F
47 pF
0.1
μ
F
V
S+
50-
Source
R
g
30.1
FB
FB = Ferrite Bead
* = Low Impedance
*2.5 V
*2.5 V
24.9
16.5
IN
IN
CM
THS4302
SLOS403G–OCTOBER 2002–REVISED JANUARY 2005
The time delays associated with turning the device on
and off are specified as the time it takes for the
amplifier to reach 50% of the nominal quiescent
current. The time delays are on the order of
microseconds because the amplifier moves in and out
of the linear mode of operation in these transitions.
The THS4302 amplifier can be used to drive high-
performance
analog-to-digital
example circuits are presented below.
converters.
Two
The first circuit uses a wideband transformer to
convert a single-ended input signal into a differential
signal. The amplified signal from the output of the
THS4302 is fed through a low-pass filter, via an
isolation resistor and an ac-coupling capacitor, to the
transformer.
Figure 45. DC-Coupled Single Supply Operation
Saving Power With Power-Down Functionality
For applications without signal content at dc, this
method of driving ADCs is useful. Where dc infor-
mation content is required, the THS4500 family of
fully differential amplifiers may be applicable.
The THS4302 features a power-down pin (PD) which
lowers the quiescent current from 37 mA down to
800 μA, ideal for reducing system power.
The power-down pin of the amplifier defaults to the
positive supply voltage in the absence of an applied
voltage, putting the amplifier in the power-on mode of
operation. To turn off the amplifier in an effort to
conserve power, the power-down pin can be driven
towards the negative rail. The threshold voltages for
power-on and power-down are relative to the supply
rails and given in the specification tables. Above the
Enable Threshold Voltage
, the device is on. Below
the
Disable Threshold Voltage
, the device is off.
Behavior in between these threshold voltages is not
specified.
Note that this power-down functionality is just that;
the amplifier consumes less power in power-down
mode. The power-down mode is not intended to
provide a high-impedance output. In other words, the
power-down functionality is not intended to allow use
as a 3-state bus driver. When in power-down mode,
the impedance looking back into the output of the
amplifier is dominated by the feedback and gain
setting resistors, but the output impedance of the
device itself varies depending on the voltage applied
to the outputs.
Figure 46. Driving an ADC Via a Transformer
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.
14
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| THS4302RGTRG4 | WIDEBAND FIXED-GAIN AMPLIFIER |
| THS4302RGTT | WIDEBAND FIXED-GAIN AMPLIFIER |
| THV1021 | 2ch Buck/Boost Inverting |
| THV1031 | 3ch Buck, Boost and Inverting Controller |
| TID01BB8 | FIBER OPTIC ISOLATOR, 1570-1610nm, LC/SPC CONNECTOR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS4302RGTR | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| THS4302RGTRG4 | 功能描述:高速運算放大器 Wideband Fixed Gain Amplifier RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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 |
| THS4302RGTT | 功能描述:高速運算放大器 Wideband Fixed Gain Amplifier RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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 |
| THS4302RGTTG4 | 功能描述:高速運算放大器 Wideband Fixed Gain Amplifier RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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 |
| THS4303 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:WIDEBAND FIXED-GAIN AMPLIFIER |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。