ZHCSOD5L April 2000 – August 2023 THS4130 , THS4131
PRODUCTION DATA
- 1
- 1 特性
- 2 應(yīng)用
- 3 說(shuō)明
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Detailed Description
- 9 Application and Implementation
- 10Device and Documentation Support
- 11Mechanical, Packaging, and Orderable Information
封裝選項(xiàng)
機(jī)械數(shù)據(jù) (封裝 | 引腳)
散熱焊盤(pán)機(jī)械數(shù)據(jù) (封裝 | 引腳)
- DGN|8
訂購(gòu)信息
8.4.1 Power-Down Mode
Power-down mode is used when power saving is required. The THS4130 power-down (PD) pin is an active low input. If left unconnected, an internal 250?kΩ resistor to VCC+ keeps the device turned on. The threshold voltage for the power-down function is approximately 1.4 V greater than VCC–. Therefore, if the PD pin is 1.4 V greater than VCC–, then the device is active. If the PD pin is less than 1.4 V greater than VCC–, then the device is off. Pull the pin to VCC– to turn the device off. Figure 8-3 shows the simplified version of the power-down circuit. While in power-down mode, the amplifier goes into a high-impedance state. The amplifier output impedance is typically greater than 1 M? in power-down mode.
Figure 8-3 Simplified Power-Down CircuitSimilar to an op amp in an inverting configuration, the output impedance of an FDA is determined by the feedback network configuration. In addition, the THS4130 has an internal 10?kΩ resistor at each output that is tied to the VCM error amplifier (see Section 8.2). The differential output impedance is equal to [(2 × RF + 2 × RG) || 20 kΩ]. Figure 8-4 shows the closed=loop output impedance of the THS4130 when in power-down.
| VCC = ±5 V, gain = 1 V/V, RF = 1 kΩ, PD = VCC– |