參數(shù)資料
型號(hào)： THS4130EVM
廠商： Texas Instruments, Inc.
英文描述： HIGH SPEED LOW NOISE, FULLY DIFFERENTIAL I/O AMPLIFIERS
中文描述： 高速低噪音，完全不同的I / O功放
文件頁(yè)數(shù)： 22/27頁(yè)
文件大小： 569K
代理商： THS4130EVM
SLOS318E MAY 2000 REVISED JANUARY 2004
22
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
THS413x 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 41. 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 42.
OUTPUT IMPEDANCE (IN POWER DOWN)
vs
FREQUENCY
Figure 42
200
1200
2200
100 k
1 M
10 M
100 M
1 G
O
f Frequency Hz
VCC =
±
5 V
G = 1
Rf = 1 k
PD =
VCC
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS4130ID 功能描述:差分放大器 Ln Diff. In/Out RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
THS4130ID 制造商:Texas Instruments 功能描述:IC AMP DIFF SMD 4130 SOIC8
THS4130IDG4 功能描述:差分放大器 Fully Differential I/O Low Noise RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
THS4130IDGK 功能描述:差分放大器 Fully Differential I/O Low Noise RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
THS4130IDGKG4 功能描述:差分放大器 Fully Differential I/O Low Noise RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調(diào)整:6 dB to 26 dB 輸入補(bǔ)償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel
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