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TLV314, TLV2314, TLV4314

SBOS754A – MARCH 2016 – REVISED MARCH 2016

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Copyright © 2016, Texas Instruments Incorporated

8.3 Feature Description

8.3.1 Operating Voltage

The TLV314 series of operational amplifiers is fully specified and ensured for operation from 1.8 V to 5.5 V. In

addition, many specifications apply from –40°C to +125°C. Parameters that vary significantly with operating

voltages or temperature are provided in the Typical Characteristics section. Bypass power-supply pins with

0.01-

μF ceramic capacitors.

8.3.2 Rail-to-Rail Input

The input common-mode voltage range of the TLV314 series extends 200 mV beyond the supply rails. This

performance is achieved with a complementary input stage: an N-channel input differential pair in parallel with a

P-channel differential pair; see the Functional Block Diagram section. The N-channel pair is active for input

voltages close to the positive rail, typically (V+) – 1.3 V to 200 mV above the positive supply, and the P-channel

pair is on for inputs from 200 mV below the negative supply to approximately (V+) – 1.3 V. There is a small

transition region, typically (V+) – 1.4 V to (V+) – 1.2 V, in which both pairs are on. This 200-mV transition region

can vary up to 300 mV with process variation. Thus, the transition region (both stages on) can range from (V+) –

1.7 V to (V+) – 1.5 V on the low end, up to (V+) – 1.1 V to (V+) – 0.9 V on the high end. Within this transition

region, PSRR, CMRR, offset voltage, offset drift, and THD can be degraded compared to device operation

outside this region.

8.3.3 Rail-to-Rail Output

Designed as a micro-power, low-noise operational amplifier, the TLV314 delivers a robust output drive capability.

A class AB output stage with common-source transistors is used to achieve full rail-to-rail output swing capability.

For resistive loads up to 10 k

Ω, the output typically swings to within 5 mV of either supply rail regardless of the

power-supply voltage applied. Different load conditions change the ability of the amplifier to swing close to the

rails; see Figure 7.

8.3.4 Common-Mode Rejection Ratio (CMRR)

The CMRR for the TLV314 is specified in several ways so the best match for a given application can be used;

see the Electrical Characteristics table. First, the CMRR of the device in the common-mode range below the

transition region [VCM < (V+) – 1.3 V] is given. This specification is the best indicator of the capability of the

device when the application requires using one of the differential input pairs. Second, the CMRR over the entire

common-mode range is specified at (VCM = –0.2 V to 5.7 V). This last value includes the variations measured

through the transition region (see Figure 4).