TLV2370IDBVT datasheet(22/66 Pages) TI2

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BIAS1

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V -

Class AB

Control

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Reference

Current

TLV2370, TLV2371, TLV2372

TLV2373, TLV2374, TLV2375

SLOS270F – MARCH 2001 – REVISED AUGUST 2016

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8 Detailed Description

8.1 Overview

The TLV237x single-supply CMOS operational amplifiers provide rail-to-rail input and output capability with

3-MHz bandwidth. Consuming only 550 μA the TLV237x is the perfect choice for portable and battery-operated

applications. The maximum recommended supply voltage is 16 V, which allows the devices to be operated from

(±8-V supplies down to ±1.35 V) a variety of rechargeable cells. The rail-to-rail inputs with high input impedance

make the TLV237x ideal for sensor signal-conditioning applications.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Rail-to-Rail Input Operation

The TLV237x input stage consists of two differential transistor pairs, NMOS and PMOS, that operate together to

achieve rail-to-rail input operation. The transition point between these two pairs can be seen in Figure 2,

Figure 3, and Figure 4 for a 2.7-V, 5-V, and 15-V supply. As the common-mode input voltage approaches the

positive supply rail, the input pair switches from the PMOS differential pair to the NMOS differential pair. This

transition occurs approximately 1.35 V from the positive rail and results in a change in offset voltage due to

different device characteristics between the NMOS and PMOS pairs. If the input signal to the device is large

enough to swing between both rails, this transition results in a reduction in common-mode rejection ratio

(CMRR). If the input signal does not swing between both rails, it is best to bias the signal in the region where

only one input pair is active. This is the region inFigure 2 through Figure 4 where the offset voltage varies slightly

across the input range and optimal CMRR can be achieved. This has the greatest impact when operating from a

2.7-V supply voltage.

8.3.2 Driving a Capacitive Load

When the amplifier is configured in this manner, capacitive loading directly on the output decreases the device

phase margin leading to high frequency ringing or oscillations. Therefore, for capacitive loads of greater than

10 pF, TI recommends that a resistor be placed in series (RNULL) with the output of the amplifier, as shown in

Figure 34. A minimum value of 20 Ω should work well for most applications.

TLV2370IDBVT Datasheet(PDF) 22 Page - Texas Instruments

TLV2370IDBVT Datasheet(HTML) 22 Page - Texas Instruments

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