7.2.2 DAC Output Gain and Buffer

Many applications require precise control of a high voltage signal, but existing digital-to-analog converters

(DACs) have a limited output range of 0V to 5V. The OPAx591 is designed for use as an output driver stage

with gain to provide a high voltage, bipolar output voltage. The OPAx591 offers excellent dc precision at high

voltage, small form factor packages, and low power consumption, making these amplifiers a great choice for

high-channel, high density systems common in many test and measurement applications.

+

–

DAC

255k

34k

VREF = 5V

42.5V

62pF

42.5V

29.8k

OPA591

VOUT

Figure 7-6. DAC Output Gain and Buffer

7.2.3 Single-Supply Piezoelectric Driver

Some piezoelectric transducers can be referenced to ground as shown in Figure 7-7. The piezoelectric load

presents a large capacitance at the output of the amplifier and proper compensation is required to avoid

instability. Figure 7-7 uses a dual-feedback compensation scheme to improve phase margin and enable accurate

voltage setting to the load. Also consider the output current drive requirement. The current drive demand is

determined by the frequency of operation and the effective capacitance of the load. High frequency and large

capacitance reduce the effective impedance of the load and thereby increase the current drive requirement. The

OPAx591 are an excellent choice to drive piezoelectric loads at dc and low frequency.

+

–

5k

75k

OPA591

DAC

5V

85V

80V

+

1nF

10

1µF

Figure 7-7. 80V Single-Supply Piezoelectric Driver

OPA591, OPA2591

SBOSA47A – FEBRUARY 2026 – REVISED SEPTEMBER 2026

www.ti.com

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