OPA336_17 datasheet(8/27 Pages) TI1

Part #	OPA336

Description	SINGLE-SUPPLY, microPower CMOS OPERATIONAL AMPLIFIERS microAmplifier Series

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OPA336, 2336, 4336

8

SBOS068C

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accuracy. For example, with RL = 25kΩ, OPA336 series op

amps perform well with capacitive loads in excess of 1000pF,

as shown in Figure 4. Without RS, capacitive load drive is

typically 350pF for these conditions, as shown in Figure 5.

Resistive Load (k

Ω)

10

5

100

10k

1k

100

Operation Above Selected Gain

Curve Not Recommended

G = +1

R

L to Ground

G = +2

R

L to Ground

G = +1

R

L to VS/2

V

S = +5V, VO = VS/2

FIGURE 4. Small-Signal Step Response Using Series Re-

sistor to Improve Capacitive Load Drive.

Alternatively, the resistor may be connected in series with

the output outside of the feedback loop. However, if there is

a resistive load parallel to the capacitive load, it and the

series resistor create a voltage divider. This introduces a

Direct Current (DC) error at the output; however, this error

may be insignificant. For instance, with RL = 100kΩ and

RS = 100Ω, there is only about a 0.1% error at the output.

Figure 5 shows the recommended operating regions for the

OPA336. Decreasing the load resistance generally improves

capacitive load drive. Figure 5 also illustrates how stability

differs depending on where the resistive load is connected.

With G = +1 and RL = 10kΩ connected to VS/2, the OPA336

can typically drive 500pF. Connecting the same load to

ground improves capacitive load drive to 1000pF.

R

S = 100Ω, Load = 2kΩ || 1000pF, VS = +5V

50

µs/div

FIGURE 5. Stability—Capacitive Load vs Resistive Load.

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