TLV9102IDDFR datasheet(25/74 Pages) TI

25 / 74 page

load

out

iso

-V

Cap Load (pF)

120

160

200

240

280

320

360

C008

RISO = 0 :, Positive Overshoot

RISO = 0 :, Negative Overshoot

RISO = 50 :, Positive Overshoot

RISO = 50 :, Negative Overshoot

Cap Load (pF)

120

160

200

240

280

320

360

C007

RISO = 0 :, Positive Overshoot

RISO = 0 :, Negative Overshoot

RISO = 50 :, Positive Overshoot

RISO = 50 :, Negative Overshoot

TLV9101, TLV9102, TLV9104

www.ti.com

SBOS943C – FEBRUARY 2019 – REVISED MAY 2020

Product Folder Links: TLV9101 TLV9102 TLV9104

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7.3.4 Capacitive Load and Stability

The TLV910x features a resistive output stage capable of driving moderate capacitive loads, and by leveraging

an isolation resistor, the device can easily be configured to drive large capacitive loads. Increasing the gain

enhances the ability of the amplifier to drive greater capacitive loads; see Figure 47 and Figure 48. The particular

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

establishing whether an amplifier will be stable in operation.

Figure 47. Small-Signal Overshoot vs Capacitive Load

(100-mV Output Step, G = 1)

Figure 48. Small-Signal Overshoot vs Capacitive Load

(100-mV Output Step, G = –1)

For additional drive capability in unity-gain configurations, improve capacitive load drive by inserting a small (10

Ω to 20 Ω) resistor, RISO, in series with the output, as shown in Figure 49. This resistor significantly reduces

ringing and maintains DC performance for purely capacitive loads. However, if a resistive load is in parallel with

the capacitive load, then a voltage divider is created, thus introducing a gain error at the output and slightly

reducing the output swing. The error introduced is proportional to the ratio RISO / RL, and is generally negligible at

low output levels. A high capacitive load drive makes the TLV910x well suited for applications such as reference

buffers, MOSFET gate drives, and cable-shield drives. The circuit shown in Figure 49 uses an isolation resistor,

RISO, to stabilize the output of an op amp. RISO modifies the open-loop gain of the system for increased phase

margin.

Figure 49. Extending Capacitive Load Drive With the TLV9101

7.3.5 Common-Mode Voltage Range

The TLV910x is a 16-V, true rail-to-rail input operational amplifier with an input common-mode range that

extends 100 mV beyond either supply rail. This wide range is achieved with paralleled complementary N-channel

and P-channel differential input pairs, as shown in Figure 50. The N-channel pair is active for input voltages

close to the positive rail, typically (V+) – 1 V to 100 mV above the positive supply. The P-channel pair is active

for inputs from 100 mV below the negative supply to approximately (V+) – 2 V. There is a small transition region,

typically (V+) –2 V to (V+) – 1 V in which both input pairs are on. This transition region can vary modestly with

process variation, and within this region PSRR, CMRR, offset voltage, offset drift, noise, and THD performance

can be degraded compared to operation outside this region. To achieve best performance with the TLV910x

family, avoid this transition region when possible.

TLV9102IDDFR Datasheet(PDF) 25 Page - Texas Instruments

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