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TLV2455A Datasheet(PDF) 26 Page - Texas Instruments

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Part # TLV2455A
Description  FAMILY OF 23-UA 220-KHZ RAIL TO RAIL INPUT/ OUTPUT OPERATIONAL AMPLIFIERS WITH SHUTDOWN
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TLV2455A Datasheet(HTML) 26 Page - Texas Instruments

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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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