參數(shù)資料
型號： THS3115IDG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 1 CHANNEL, VIDEO AMPLIFIER, PDSO14
封裝： GREEN, PLASITC, MS-012AB, SOIC-14
文件頁數(shù)： 6/35頁
文件大?。?/td> 1215K
代理商： THS3115IDG4
1nF
+V
S
R
G
24.9 W
+V
S
-V
S
5.11 W
R
F
R
G
24.9 W
+V
S
-V
S
5.11 W
R
F
49.9
R
W
G
+V
S
-V
S
-V
S
5.11 W
R
F
2R
G
+V
S
+V
S
-V
S
5.11 W
R
F
SLOS385C – SEPTEMBER 2001 – REVISED SEPTEMBER 2010
www.ti.com
Figure 48 shows a configuration that uses two
Saving Power with Shutdown Functionality
amplifiers in parallel to double the output drive current
and Setting Threshold Levels with the
to larger capacitive loads. This technique is used
Reference Pin
when more output current is needed to charge and
The
THS3115
features
a
shutdown
pin
discharge the load faster as when driving large FET
(SHUTDOWN) that lowers the quiescent current from
transistors.
4.9 mA/amp down to 300 A/amp, ideal for reducing
system power.
The shutdown pin of the amplifier defaults to the REF
pin voltage in the absence of an applied voltage,
putting the amplifier in the normal on mode of
operation. To turn off the amplifier in an effort to
conserve power, the shutdown pin can be driven
towards the positive rail. The threshold voltages for
power-on and power-down (or shutdown) are relative
to the supply rails and are given in the Shutdown
Characteristics table. Below the Enable threshold
voltage, the device is on. Above the Disable threshold
voltage, the device is off. Behavior between these
threshold voltages is not specified.
Note that this shutdown functionality is self-defining:
the amplifier consumes less power in shutdown
mode. The shutdown mode is not intended to provide
a
high-impedance
output.
In
other
words,
the
shutdown functionality is not intended to allow use as
Figure 48. Parallel Amplifiers for Higher Output
a 3-state bus driver. When in shutdown mode, the
Drive
impedance looking back into the output of the
amplifier is dominated by the feedback and gain
setting resistors, but the output impedance of the
Figure 49 shows a push-pull FET driver circuit typical
device itself varies depending on the voltage applied
of ultrasound applications with isolation resistors to
to the outputs.
isolate the gate capacitance from the amplifier.
As with most current feedback amplifiers, the internal
architecture places some limitations on the system
when in shutdown mode. Most notably is the fact that
the amplifier actually turns on if there is a ±0.7 V or
greater difference between the two input nodes (IN+
and IN–) of the amplifier. If this difference exceeds
±0.7 V, the output of the amplifier creates an output
voltage equal to approximately [(IN+ – IN–) – 0.7V] ×
Gain. Also, if a voltage is applied to the output while
in shutdown mode, the IN– node voltage is equal to
VO(applied) × RG/(RF + RG) . For low gain configurations
and a large applied voltage at the output, the
amplifier may actually turn on because of the
behavior described here.
The time delays associated with turning the device on
and off are specified as the time it takes for the
amplifier to reach either 10% or 90% of the final
output voltage. The time delays are in the order of
microseconds because the amplifier moves in and out
Figure 49. PowerFET Drive Circuit
of the linear mode of operation in these transitions.
space
14
Copyright 2001–2010, Texas Instruments Incorporated
Product Folder Link(s): THS3112 THS3115
相關(guān)PDF資料
PDF描述
THS3115CD 1 CHANNEL, VIDEO AMPLIFIER, PDSO14
THS3115CPWP 1 CHANNEL, VIDEO AMPLIFIER, PDSO14
THS3115ID 1 CHANNEL, VIDEO AMPLIFIER, PDSO14
THS3115IPWP 1 CHANNEL, VIDEO AMPLIFIER, PDSO14
THS3115CDR 1 CHANNEL, VIDEO AMPLIFIER, PDSO14
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS3115IDR 功能描述:高速運算放大器 Dual Lo-Noise Hi-Out Current 110-MHz 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
THS3115IDRG4 功能描述:高速運算放大器 Dual Lo-Noise Hi-Out Current 110-MHz 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
THS3115IPWP 功能描述:高速運算放大器 Dual Lo-Noise Hi-Out Current 110-MHz 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
THS3115IPWPG4 功能描述:高速運算放大器 Dual Lo-Noise Hi-Out Current 110-MHz 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
THS3115IPWPR 功能描述:高速運算放大器 Dual Lo-Noise Hi-Out Current 110-MHz 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
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