THS3095D datasheet(18/46 Pages) TI2

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8 Detailed Description

8.1 Overview

The THS3091 and THS3095 (THS309x) are high-voltage, low-distortion, high-speed, current feedback

amplifiers. The THS309x are designed to operate over a wide supply range of ±5 V to ±16 V for applications

requiring large, linear output swings, such as arbitrary waveform generators.

The THS3095 also features a power-down pin that puts the amplifier into a low-power standby mode, and lowers

the quiescent current from 9.5 mA to 500 µA.

8.2 Functional Block Diagram

ZIN–

(s)

ZOL(s) × Ierr

VIN+

VIN–

VSIG

VREF

–

(1 + RF / RG) × VSIG

VREF

Ierr

VOUT

AV = VO / VIN+ = 1 + (RF / RG)

THS3091

8.3 Feature Description

8.3.1 Power-Down and Reference Pins Functionality

The THS3095 features a power-down pin (PD) designed to reduce system power that lowers the quiescent

current from 9.5 mA down to 500 μA. The THS3095 also features a reference pin (REF) that allows the user to

control the enable or disable power-down voltage levels applied to the PD pin.

The power-down pin of the amplifier defaults to the positive supply voltage in the absence of an applied voltage,

putting the amplifier in the power-on mode of operation. Driving the power-down pin towards the negative rail will

turn off the amplifier and conserve power The following equations show the relationship between the reference

voltage and the power-down thresholds:

≤ REF + 0.8 V for disable

(1)

≤ REF + 2.0 V for enable

(2)

where the usable range at the REF pin is:

VS− ≤ VREF ≤ VS+− 4 V

(3)

The recommended mode of operation is to tie the REF pin to midrail, thus setting the disable or enable

thresholds to the following equations:

Vmidrail + 0.8 V

(4)

Vmidrail + 2 V

(5)

Power-Down mode is not intended to provide a high-impedance output. In other words, the power-down

functionality is not intended to allow use as a tri-state bus driver. When in Power-Down mode, the impedance at

the output of the amplifier is dominated by the feedback and gain-setting resistors, but the output impedance of

the device varies depending on the voltage applied to the outputs.

THS3091, THS3095

SLOS423K – SEPTEMBER 2003 – REVISED APRIL 2023

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