參數資料
型號： THS3095DR
廠商： Texas Instruments, Inc.
英文描述： HIGH-VOLTAGE, LOW-DISTORTION, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS
中文描述： 高壓，低失真，電流反饋運算放大器
文件頁數： 21/31頁
文件大?。?/td> 1083K
代理商： THS3095DR
www.ti.com
_
+
V
S
V
S
49.9
5.11
1
μ
F
249
V
S
27 pF
1 k
R
F
R
G
FB
100-
LOAD
F
IN
_
+
V
S
V
S
_
+
V
S
V
S
V
S
V
S
866
866
191
5.11
5.11
SAVING POWER WITH POWER-DOWN
FUNCTIONALITY AND SETTING
THRESHOLD LEVELS WITH THE
REFERENCE PIN
The THS3095 features a power-down pin (PD) which
lowers the quiescent current from 9.5 mA down to
500 μA, ideal for reducing system power.
_
+
V
S
V
S
1 k
5.11
249
V
S
_
+
V
S
V
S
1 k
5.11
249
24.9
24.9
1 nF
THS3091
THS3095
SLOS423C–SEPTEMBER 2003–REVISED AUGUST 2004
Figure 67.
Figure 68 is shown using two amplifiers in parallel to
double the output drive current to larger capacitive
loads. This technique is used when more output
current is needed to charge and discharge the load
faster like when driving large FET transistors.
Figure 69. PowerFET Drive Circuit
The power-down pin of the amplifier defaults to the
negative 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 positive rail. The threshold voltages for
power-on and power-down are relative to the supply
rails and are given in the specification tables. Below
the
Enable Threshold Voltage
, the device is on.
Above the
Disable Threshold Voltage
, the device is
off. Behavior in between these threshold voltages is
not specified.
Figure 68.
Figure 69 shows a push-pull FET driver circuit typical
of ultrasound applications with isolation resistors to
isolate the gate capacitance from the amplifier.
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
gain-setting resistors, but the output impedance of the
device itself varies depending on the voltage applied
to the outputs.
by
the
feedback
and
Figure 70 shows the total system output impedance
which includes the amplifier output impedance in
parallel with the feedback plus gain resistors, which
cumulate to 2380
. Figure 59 shows this circuit
configuration for reference.
21
相關PDF資料
PDF描述
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相關代理商/技術參數
參數描述
THS3095DRG4 功能描述:高速運算放大器 Single Lo-Distort Current Feedback 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
THS3095EVM 功能描述:放大器 IC 開發(fā)工具 THS3095 Eval Module RoHS:否 制造商:International Rectifier 產品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V
THS3096 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH-VOLTAGE, LOW-DISTORTION, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS
THS3096D 功能描述:高速運算放大器 Dual Hig-Vltg 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
THS3096DG4 功能描述:高速運算放大器 Dual Hig-Vltg 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
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