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| 型號： | THS4140CDGK |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | HIGH SPEED FULLY DIFFERENTIAL I/O AMPLIFIERS |
| 中文描述： | 高速全差分的I / O功放 |
| 文件頁數(shù)： | 19/24頁 |
| 文件大?。?/td> | 523K |
| 代理商： | THS4140CDGK |
SLOS320E MAY 2000 REVISED JANUARY 2004
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
power-down mode
The power-down mode is used when power saving is required. The power-down terminal (PD) found on the
THS414x is an active low terminal. If it is left as a no-connect terminal, the device will always stay on due to an
internal 50 k
resistor to V
CC
. The threshold voltage for this terminal is approximately 1.4 V above V
CC
. This
means that if the PD terminal is 1.4 V above V
CC
, the device is active. If the PD terminal is less than 1.4 V above
V
CC
, the device is off. For example, if V
CC
= 5 V, then the device is on when PD reaches 3.6 V, (-5 V + 1.4
V = 3.6 V). By the same calculation, the device is off below 3.6 V. It is recommended to pull the terminal to
V
CC
in order to turn the device off. The following graph shows the simplified version of the power-down circuit.
While in the power-down state, the amplifier goes into a high-impedance state. The amplifier output impedance
is typically greater than 1 M
in the power-down state.
VCC
PD
VCC
To Internal Bias
Circuitry Control
50 k
Figure 33. Simplified Power-Down Circuit
Due to the similarity of the standard inverting amplifier configuration, the output impedance appears to be very
low while in the power-down state. This is because the feedback resistor (R
f
) and the gain resistor (R
(g)
) are
still connected to the circuit. Therefore, a current path is allowed between the input of the amplifier and the output
of the amplifier. An example of the closed-loop output impedance is shown in Figure 34.
Figure 34
200
10 k
1200
2200
100 k
1 M
10 M
100 M
f Frequency Hz
O
OUTPUT IMPEDANCE (IN SHUTDOWN)
vs
FREQUENCY
VCC =
±
5 V,
VI = 0.8 VPP RMS
PD =
VCC
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| THS4140CDGKG4 | 功能描述:特殊用途放大器 Fully Diff I/O High Slew Rate RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS4140CDGKR | 功能描述:特殊用途放大器 Fully Diff I/O High Slew Rate RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS4140CDGKRG4 | 功能描述:特殊用途放大器 Fully Diff I/O High Slew Rate RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS4140CDGN | 功能描述:特殊用途放大器 Fully Diff I/O High Slew Rate RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| THS4140CDGNG4 | 功能描述:特殊用途放大器 Fully Diff I/O High Slew Rate RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補(bǔ)償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
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