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TLV2455A Datasheet(PDF) 26 Page - Texas Instruments |
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TLV2455A Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 45 page  TLV2450, TLV2451, TLV2452, TLV2453, TLV2454, TLV2455, TLV245xA FAMILY OF 23 µA 220kHz RAILTORAIL INPUT/OUTPUT OPERATIONAL AMPLIFIERS WITH SHUTDOWN SLOS218F − DECEMBER 1998 − REVISED JANUARY 2005 26 WWW.TI.COM POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 APPLICATION INFORMATION shutdown function Three members of the TLV245x family (TLV2450/3/5) have a shutdown terminal for conserving battery life in portable applications. When the shutdown terminal is pulled to the voltage level on the GND terminal of the device, the supply current is reduced to 16 nA/channel, the amplifier is disabled, and the outputs are placed in a high impedance mode. To enable the amplifier, the shutdown terminal must be pulled high. The shutdown terminal should never be left floating. The shutdown terminal threshold is always referenced to the GND terminal of the device. Therefore, when operating the device with split supply voltages (e.g. ±2.5 V), the shutdown terminal needs to be pulled to VDD− (not system ground) to disable the operational amplifier. The amplifier’s output with a shutdown pulse is shown in Figures 42, 43, 44, and 45. The amplifier is powered with a single 5-V supply and configured as a noninverting configuration with a gain of 5. The amplifier turnon and turnoff times are measured from the 50% point of the shutdown pulse to the 50% point of the output waveform. The times for the single, dual, and quad are listed in the data tables. Figures 46 and 47 show the amplifier’s forward and reverse isolation in shutdown. The operational amplifier is powered by ±1.35-V supplies and configured as a voltage follower (AV = 1). The isolation performance is plotted across frequency using 0.1-VPP, 1.5-VPP, and 2.5-VPP input signals. During normal operation, the amplifier would not be able to handle a 2.5-VPP input signal with a supply voltage of ±1.35 V since it exceeds the common-mode input voltage range (VICR). However, this curve illustrates that the amplifier remains in shutdown even under a worst case scenario. driving a capacitive load When the amplifier is configured 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 (RNULL) with the output of the amplifier, as shown in Figure 49. A minimum value of 20 Ω should work well for most applications. CLOAD RF Input Output RG RNULL + − Figure 49. Driving a Capacitive Load |
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