參數(shù)資料
型號(hào)： THS4271DGN
廠(chǎng)商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 音頻／視頻放大
英文描述： 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝： POWERPAD, PLASTIC, MSOP-8
文件頁(yè)數(shù)： 15/48頁(yè)
文件大小： 1227K
代理商： THS4271DGN
_
+
THS4271
49.9
50
Source
VI
+VS
VO
Rf
249
Rg
249
+VS
2
+VS
2
_
+
THS4271
249
50
Source
VI
VS
VO
Rf
249
+VS
2
+VS
2
61.9
Rg
499
RT
499
RT
SLOS397F – JULY 2002 – REVISED OCTOBER 2009
www.ti.com
SINGLE-SUPPLY OPERATION
Note that this power-down functionality is just that;
the amplifier consumes less power in power-down
The THS4271 is designed to operate from a single
mode. The power-down mode is not intended to
5-V to 15-V power supply. When operating from a
provide a high-impedance output. In other words, the
single power supply, care must be taken to ensure
power-down functionality is not intended to allow use
the input signal and amplifier are biased appropriately
as a 3-state bus driver. When in power-down mode,
to allow for the maximum output voltage swing. The
the impedance looking back into the output of the
circuits shown in Figure 77 demonstrate methods to
amplifier is dominated by the feedback and gain
configure an amplifier in a manner conducive for
setting resistors, but the output impedance of the
single-supply operation.
device itself varies depending on the voltage applied
to the outputs.
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.
Power-Down Reference Pin Operation
In addition to the power-down pin, the THS4275 also
features a reference pin (REF) which allows the user
to control the enable or disable power-down voltage
levels applied to the PD pin. Operation of the
reference pin as it relates to the power-down pin is
described below.
In most split-supply applications, the reference pin is
connected to ground. In some cases, the user may
want to connect it to the negative or positive supply
rail. In either case, the user needs to be aware of the
voltage level thresholds that apply to the power-down
pin. Table 2 and Table 3 show examples and
illustrate the relationship between the reference
Figure 77. DC-Coupled Single-Supply Operation
voltage and the power-down thresholds.
Table 2. Power-Down Threshold Voltage Levels
Saving Power with Power-Down Functionality and
(REF
≤ MIDRAIL)
Setting Threshold Levels with the Reference Pin
SUPPLY
REFERENCE
ENABLE
DISABLE
The THS4275 features a power-down pin (PD) which
VOLTAGE
PIN VOLTAGE
LEVEL
(V)
lowers the quiescent current from 22 mA down to 700
μA, ideal for reducing system power.
GND
≥ 1.8
≤ 1
±5
-2.5
≥ -0.7
≤ –1.5
The power-down pin of the amplifier defaults to the
positive supply voltage in the absence of an applied
-5
≥ -3.2
≤ -4
voltage, putting the amplifier in the power-on mode of
GND
≥ 1.8
≤ 1
operation. To turn off the amplifier in an effort to
5
1
≥ 2.8
≤ 2
conserve power, the power-down pin can be driven
2.5
≥ 4.3
≤ 3.5
towards the negative rail. The threshold voltages for
power-on and power-down are relative to the supply
In Table 2, the threshold levels are derived by the
rails and given in the specification tables. Above the
following equations:
Enable Threshold Voltage, the device is on. Below
REF + 1.8 V for enable
the Disable Threshold Voltage, the device is off.
REF + 1 V for disable
Behavior in between these threshold voltages is not
specified.
Note that in order to maintain these threshold levels,
the reference pin can be any voltage between VS– or
GND up to Vs/2 (midrail).
22
Copyright 2002–2009, Texas Instruments Incorporated
Product Folder Link(s): THS4271 THS4275
相關(guān)PDF資料
PDF描述
THS4271DRBR 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS4271DGN 制造商:Texas Instruments 功能描述:IC SM OP-AMP HI-SPEED VFB
THS4271DGN 制造商:Texas Instruments 功能描述:OP AMP HIGH SPEED VFB HTSSOP 427
THS4271DGNG4 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
THS4271DGNR 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
THS4271DGNRG4 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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