TLV313IDBVR.A datasheet(17/44 Pages) TI2

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TLV313, TLV2313, TLV4313

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SBOS753B – JUNE 2016 – REVISED FEBRUARY 2017

Product Folder Links: TLV313 TLV2313 TLV4313

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8.3 Feature Description

8.3.1 Operating Voltage

The TLV313 series is fully specified and tested from 1.8 V to 5.5 V (±0.9 V to ±2.75 V). Parameters that vary with

supply voltage are illustrated in the Typical Characteristics section.

8.3.2 Rail-to-Rail Input

The input common-mode voltage range of the TLV313 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, as shown in 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, while 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 may vary up to 300 mV with process variation. Thus, the transition region (both stages on) may 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 may 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 TLV313 device 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 100 kΩ, the output swings typically 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, as shown in Figure 12.

8.3.4 Common-Mode Rejection Ratio (CMRR)

CMRR for the TLV313 device is specified in several ways so the best match for a given application may be used;

see the Electrical Characteristics. 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 use of 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 seen through the

transition region, as shown in Figure 4.

8.3.5 Capacitive Load and Stability

The TLV313 device is designed to be used in applications where driving a capacitive load is required. As with all

op amps, there may be specific instances where the TLV313 device may become unstable. The particular op

amp circuit configuration, layout, gain, and output loading are some of the factors to consider when establishing

whether or not an amplifier is stable in operation. An op amp in the unity-gain (+1-V/V) buffer configuration that

drives a capacitive load exhibits a greater tendency to be unstable than an amplifier operated at a higher noise

gain. The capacitive load, in conjunction with the op amp output resistance, creates a pole within the feedback

loop that degrades the phase margin. The degradation of the phase margin increases as the capacitive loading

increases. When operating in the unity-gain configuration, the TLV313 device remains stable with a pure

capacitive load up to approximately 1 nF. The equivalent series resistance (ESR) of some capacitors (CL greater

than 1 μF) is sufficient to alter the phase characteristics in the feedback loop such that the amplifier remains

stable. Increasing the amplifier closed-loop gain allows the amplifier to drive increasingly larger capacitance. This

increased capability is evident when observing the overshoot response of the amplifier at higher voltage gains.

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