TLV914X datasheet(20/48 Pages) TI1

20 / 48 page

6.3.2 Common-Mode Voltage Range

The TLV914x is an 18V, true rail-to-rail input operational amplifier with an input common-mode range that

extends to both supply rails. This wide range is achieved with paralleled complementary PMOS and NMOS

differential input pairs, as shown in Figure 6-3. The NMOS pair is active for input voltages close to the positive

rail, typically from (V+) – 1V to the positive supply. The PMOS pair is active for inputs from the negative supply

to approximately (V+) – 2V. There is a small transition region, multichannel typically (V+) – 2V to (V+) – 1V, in

which both input pairs are on. This transition region can vary modestly with process variation. Within this region

PSRR, CMRR, offset voltage, offset drift, noise, and THD performance can be degraded compared to operation

outside this region.

Figure 5-17 shows this transition region for a typical device in terms of input voltage offset in more detail.

For more information on common-mode voltage range and complementary pair interaction, see the Op amps

with complementary-pair input stages: What are the design trade-offs? Analog Design Journal.

NMOS

PMOS

NMOS

V-

V+

IN+

IN-

Figure 6-3. Rail-to-Rail Input Stage

6.3.3 EMI Rejection

The TLV914x uses integrated electromagnetic interference (EMI) filtering to reduce the effects of EMI from

sources such as wireless communications and densely-populated boards with a mix of analog signal chain and

digital components. EMI immunity can be improved with circuit design techniques; the TLV914x benefits from

these design improvements. Texas Instruments has developed the ability to accurately measure and quantify the

immunity of an operational amplifier over a broad frequency spectrum extending from 10MHz to 6GHz. Table 6-1

provides the EMIRR IN+ values for the TLV914x at particular frequencies commonly encountered in real-world

applications. The EMI Rejection Ratio of Operational Amplifiers application report contains detailed information

on the topic of EMIRR performance and how EMIRR relates to op amps and is available for download from

www.ti.com.

TLV9141, TLV9142, TLV9144

SBOSAM4 – DECEMBER 2024

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TLV914X Datasheet(PDF) 20 Page - Texas Instruments