TLV277xEP, TLV277xAEP

FAMILY OF 2.7V HIGHSLEW RATE RAILTORAIL OUTPUT

OPERATIONAL AMPLIFIERS WITH SHUTDOWN

SGLS317A − OCTOBER 2005 − REVISED SEPTEMBER 2007

32

POST OFFICE BOX 655303

APPLICATION INFORMATION

shutdown function

Three members of the TLV277x family (TLV2770/3/5) have a shutdown terminal for conserving battery life in

portable applications. When the shutdown terminal is tied low, the supply current is reduced to 0.8

µA/channel,

the amplifier is disabled, and the outputs are placed in a high impedance mode. To enable the amplifier, the

shutdown terminal can either be left floating or pulled high. When the shutdown terminal is left floating, care must

be taken to ensure that parasitic leakage current at the shutdown terminal does not inadvertently place the

when operating the device with split supply voltages (e.g.

(not GND) to disable the operational amplifier.

The amplifier output with a shutdown pulse is shown in Figures 48, 49, and 50. 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. The bump on the rising edge of the TLV2770

output waveform is due to the start-up circuit on the bias generator. For the dual and quad (TLV2773/5), this

bump is attributed to the bias generator’s start-up circuit as well as the crosstalk between the other channel(s),

which are in shutdown.

Figures 55 and 56 show the amplifier’s forward and reverse isolation in shutdown. The operational amplifier is

powered by

a worst case scenario.