TLV2341IPWLE datasheet(2/51 Pages) TI

2 / 51 page

TLV2341, TLV2341Y

LinCMOS

™ PROGRAMMABLE LOW-VOLTAGE

OPERATIONAL AMPLIFIERS

SLOS110A – MAY 1992 – REVISED AUGUST 1994

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

bias-select feature

The TLV2342 offers a bias-select feature that allows the user to select any one of three bias levels, depending

on the level of performance desired. The tradeoffs between bias levels involve ac performance and power

dissipation (see Table 1).

Table 1. Effect of Bias Selection on Performance

TYPICAL PARAMETER VALUES

MODE

TYPICAL PARAMETER VALUES

TA = 25°C, VDD = 3 V

HIGH BIAS

RL = 10 kΩ

MEDIUM BIAS

RL = 100 kΩ

LOW BIAS

RL = 1 MΩ

UNIT

Power dissipation

975

195

µW

Slew rate

2.1

0.38

0.02

µs

Equivalent input noise voltage at f = 1 kHz

nV/

√Hz

Unity-gain bandwidth

790

300

kHz

φm

Phase margin

AVD

Large-signal differential voltage amplification

400

V/mV

bias selection

Bias selection is achieved by connecting BIAS SELECT to one of three voltage levels (see Figure 1). For

medium-bias applications, it is recommended that the bias-select pin be connected to the midpoint between the

supply rails. This procedure is simple in split-supply applications since this point is ground. In single-supply

applications, the medium-bias mode necessitates using a voltage divider as indicated in Figure 1. The use of

large-value resistors in the voltage divider reduces the current drain of the divider from the supply line. However,

large-value resistors used in conjunction with a large-value capacitor require significant time to charge up to

the supply midpoint after the supply is switched on. A voltage other than the midpoint may be used if it is within

the voltages specified in the following table.

To the Bias-Select Pin

1 M

Ω

High

Medium

Low

VDD

1 M

Ω

0.01

µF

BIAS MODE

BIAS-SELECT VOLTAGE

(single supply)

Low

Medium

High

VDD

1 V to VDD –1 V

GND

Figure 1. Bias Selection for Single-Supply Applications

TLV2341IPWLE Datasheet(PDF) 2 Page - Texas Instruments

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