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參數(shù)資料
| 型號： | THS3121CDGNRG4 |
| 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, MSOP-8 |
| 文件頁數(shù)： | 10/35頁 |
| 文件大小： | 975K |
| 代理商： | THS3121CDGNRG4 |
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_
+
VS
-VS
49.9
5.11
1
F
124
VS
27 pF
499
RF
RG
FB
100
LOAD
FIN
_
+
VS
-VS
_
+
VS
-VS
VS
301
301
66.5
5.11
5.11
_
+
VS
-VS
499
5.11
124
VS
_
+
VS
-VS
499
5.11
124
24.9
24.9
1 nF
SLOS420E – SEPTEMBER 2003 – REVISED OCTOBER 2009........................................................................................................................................ www.ti.com
Figure 57 shows a push-pull FET driver circuit typical
of ultrasound applications with isolation resistors to
isolate the gate capacitance from the amplifier.
Figure 55. Feedback Technique with Input Ferrite
Bead for Capacitive Load
Figure 56 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
Figure 57. PowerFET Drive Circuit
faster as when driving large FET transistors.
SAVING POWER WITH POWER-DOWN
FUNCTIONALITY AND SETTING
THRESHOLD LEVELS WITH THE
REFERENCE PIN
The THS3120 features a power-down pin (PD) which
lowers the quiescent current from 7 mA down to
300
μA, ideal for reducing system power.
The power-down 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 power-down pin can be driven
towards the positive rail. The threshold voltages for
power-on and power-down are relative to the supply
Figure 56. Parallel Amplifiers for Higher Output
rails and are given in the specification tables. Below
Drive
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.
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.
18
Copyright 2003–2009, Texas Instruments Incorporated
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| THS3121IDGNRG4 | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS3121IDRG4 | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS3120CDG4 | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS3120CDRG4 | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| THS3120IDGNRG4 | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| THS3121CDR | 功能描述:高速運算放大器 Sngl Lo-Noise Hi-Out Current-Feedback 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 |
| THS3121CDRG4 | 功能描述:高速運算放大器 Sngl Lo-Noise Hi-Out Current-Feedback 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 |
| THS3121DGN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-NOISE, HIGH-OUTPUT DRIVE, CURRENT-FEEDBACK, OPERATIONAL AMPLIFIERS |
| THS3121DGNR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW-NOISE, HIGH-OUTPUT DRIVE, CURRENT-FEEDBACK, OPERATIONAL AMPLIFIERS |
| THS3121EVM | 功能描述:放大器 IC 開發(fā)工具 THS3121 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)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 |
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