LMP7717 datasheet(24/56 Pages) TI

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7.4 Device Functional Modes

7.4.1 Split-Supply Operation (±1.35 V to ±2.7 V)

To facilitate testing with common lab equipment, the OPA838 EVM (see EVM board link) is built to allow split-

supply operation. This configuration eases lab testing because the midpoint between the power rails is ground,

and most signal generators, network analyzers, oscilloscopes, spectrum analyzers, and other lab equipment

have inputs and outputs with a ground reference. This simplifies characterization by removing the requirement

for blocking capacitors.

Figure 7-8 shows a simple noninverting configuration analogous to Figure 7-1 with a ±2.5

‑V supply and VREF

equal to ground. The input and output swing symmetrically around ground. For ease of use, split-supplies are

preferred in systems where signals swing around ground. Using bipolar (or split) supplies shifts the thresholds

for the shutdown control. The disable control is referenced from the negative supply, typically ground, in a

single-supply application. However, to disable using a negative supply requires that the pin is set to within 0.55 V

greater than the negative supply. If disable is not required, connect that pin to the positive supply to maintain

correct operation, even for split-supply applications. Do not float the disable pin; assert the pin to a voltage.

RF 1 NŸ

±2.1 VOUT

Ground

Centered

RG 200 Ÿ

R2 165 Ÿ

U1 OPA838

VM1

Input

Signal

VEE

VCC

VEE

VCC

V1 2.5 V

V2 ±2.5 V

±0.35 VIN

20 nsec edge

2 MHz input

Figure 7-8. Split-Supply Operation

Time (nsec)

200

300

400

500

600

700

800

-2.5

-2

-1.5

-1

-0.5

0.5

1.5

2.5

D068

Input

Output

Figure 7-9. Bipolar-Supply Step Response

OPA838

SBOS867D – AUGUST 2017 – REVISED SEPTEMBER 2024

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