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參數資料
| 型號： | THS3122IDR |
| 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： | GREEN, PLASTIC, SOIC-8 |
| 文件頁數： | 6/34頁 |
| 文件大小： | 1276K |
| 代理商： | THS3122IDR |
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1nF
+V
S
R
G
24.9 W
+V
S
-VS
5.11 W
R
F
R
G
24.9 W
+V
S
-VS
5.11 W
R
F
+V
S
-VS
5.11 W
R
F
2R
G
+V
S
+V
S
-VS
5.11 W
R
F
SLOS382D
– SEPTEMBER 2001 – REVISED FEBRUARY 2011
Figure 46 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
THS3125
features
a
shutdown
pin
discharge the load faster as when driving large FET
(SHUTDOWN) that lowers the quiescent current from
transistors.
8.4 mA/amp down to 370
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 (THS3125 Only) 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 46. 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 47 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 47. PowerFET Drive Circuit
of the linear mode of operation in these transitions.
space
14
2001–2011, Texas Instruments Incorporated
相關PDF資料 |
PDF描述 |
|---|---|
| THS3122CDDAR | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS3122IDDAR | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS3122CDG4 | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS3122CDRG4 | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS3122IDG4 | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| THS3122IDRG4 | 功能描述:高速運算放大器 Dual High Output Current 120-MHz 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 |
| THS3125 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-NOISE, HIGH-SPEED, 450 mA CURRENT FEEDBACK AMPLIFIERS |
| THS3125CD | 功能描述:高速運算放大器 Dual High Output Current 120-MHz 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 |
| THS3125CDG4 | 功能描述:高速運算放大器 Dual High Output Current 120-MHz 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 |
| THS3125CDR | 功能描述:高速運算放大器 Dual High Output Current 120-MHz 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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