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TLV4110CDGN Datasheet(PDF) 11 Page - Texas Instruments |
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TLV4110CDGN Datasheet(HTML) 11 Page - Texas Instruments |
11 / 21 page TLV4110, TLV4111, TLV4112, TLV4113 FAMILY OF HIGH OUTPUT DRIVE OPERATIONAL AMPLIFIERS WITH SHUTDOWN SLOS289A – DECEMBER 1999 – REVISED APRIL 2000 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION shutdown function Two members of the TLV411x family (TLV4110/3) have a shutdown terminal for conserving battery life in portable applications. When the shutdown terminal is tied low, the supply current is reduced to just nano amps per channel, the amplifier is disabled, and the outputs are placed in a high impedance mode. In order to save power in shutdown mode, an external pullup resistor is required, thererfore, to enable the amplifier the shutdown terminal must be pulled high. When the shutdown terminal is left floating, care should be taken to ensure that parasitic leakage current at the shutdown terminal does not inadvertently place the operational amplifier into shutdown. 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 1 nF, it is recommended that a resistor be placed in series (RNULL) with the output of the amplifier, as shown in Figure 24. A maximum value of 20 Ω should work well for most applications. CLOAD RF Input Output RG RNULL + – RL CL RF Input Output RG RNULL + – RL Snubber C (a) (b) Figure 24. Driving a Capacitive Load offset voltage The output offset voltage, (VOO) is the sum of the input offset voltage (VIO) and both input bias currents (IIB) times the corresponding gains. The following schematic and formula can be used to calculate the output offset voltage: V OO + V IO 1 ) R F R G " I IB ) R S 1 ) R F R G " I IB– R F + – VI + RG RS RF IIB– VO IIB+ Figure 25. Output Offset Voltage Model |
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