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參數(shù)資料
| 型號： | THS7002CPWP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封裝： | GREEN, PLASTIC, HTSSOP-28 |
| 文件頁數(shù)： | 16/41頁 |
| 文件大?。?/td> | 1203K |
| 代理商： | THS7002CPWP |
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THS7001, THS7002
70MHz PROGRAMMABLEGAIN AMPLIFIERS
SLOS214C OCTOBER 1998 REVISED MARCH 2007
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
shutdown control
There are two shutdown pins which control the shutdown for each half of the THS7002 and one shutdown pin
for the THS7001. When the shutdown pins signals are low, the THS7001 and THS7002 is active. But, when a
shutdown pin is high (+5 V), a preamplifier and the respective PGA section is turned off. Just like the Gain
controls, the shutdown logic is not latched and should always have a signal applied to them. A 3.3-k
resistor
to ground is usually applied to ensure a fixed logic state. A simplified circuit can be seen in Figure 60.
+VCC
To Internal
Bias Circuitry
Control
VCC
DGND
53 k
Gain
Figure 60. Simplified THS7001 and THS7002 Shutdown Circuit
One aspect of the shutdown feature, which is often over-looked, is that the PGA section will still have an output
while in shutdown mode. This is due to the internally fixed RF and RG resistors. This effect is true for any amplifier
connected as an inverter. The internal circuitry may be powered down and in a high-impedance state, but the
resistors are always there. This will then allow the input signal current to flow through these resistors and into
the output. The equivalent resistance of RF and RG is approximately 3 k. To minimize this effect, a shunt
resistor to ground may be utilized, This will act as a classic voltage divider and will reduce the feed-through
voltage seen at the PGA output. The drawback to this is the increased load on the PGA while in the active state.
driving a capacitive load
Driving capacitive loads with high-performance amplifiers is not a problem as long as certain precautions are
taken. The first is to realize that the THS7001 and THS7002 has been internally compensated to maximize its
bandwidth and slew rate performance. When an amplifier is compensated in this manner, capacitive loading
directly on the output will decrease the device’s phase margin leading to high frequency ringing or oscillations.
Therefore, for capacitive loads of greater than 10 pF, it is recommended that a resistor be placed in series with
the output of the amplifier, as shown in Figure 61. A minimum value of 20
should work well for most
applications. For example, in 75-
transmission systems, setting the series resistor value to 75 both isolates
any capacitance loading and provides the proper line impedance matching at the source end.
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| THS7002CPWPG4 | 功能描述:特殊用途放大器 70-MHz Hi-Spd Dual Prgrmbl-Gain Amp 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 |
| THS7002CPWPR | 功能描述:特殊用途放大器 70-MHz Programmable- Gain Dual 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 |
| THS7002CPWPRG4 | 功能描述:特殊用途放大器 70-MHz Programmable- Gain Dual 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 |
| THS7002EVM | 功能描述:放大器 IC 開發(fā)工具 THS7002 Hi-Spd Amp 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 |
| THS7002IPWP | 功能描述:特殊用途放大器 70-MHz Programmable- Gain Dual 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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