OPA836IDBVT datasheet(36/66 Pages) TI2

36 / 66 page

9.1.9 Pulse Application With Single-Supply

For pulsed applications, where the signal is at ground and pulses to a positive or negative voltage, the circuit

bias-voltage considerations differ from those in an application with a signal that swings symmetrical about a

reference point. Figure 9-7 shows a circuit where the signal is at ground (0 V) and pulses to a positive value.

OPA836

Signal and bias

from previous stage

Signal and bias to

next stage

5 V

0 V

VSIG

VOUT

GVSIG

0 V

Figure 9-7. Noninverting Single Supply With Pulse

If the input signal pulses negative from ground, an inverting amplifier is more appropriate as shown in Figure

9-8. A key consideration in noninverting and inverting cases is that the input and output voltages are kept within

the limits of the amplifier. Because the VICR of the OPA836 device includes the negative supply rail, the OPA836

operational amplifier is well-suited to this application.

OPA 836

Signal and bias

from previous stage

Signal and bias to

next stage

5 V

GVSIG

0 V

VSIG

VOUT

Figure 9-8. Inverting Single Supply With Pulse

9.1.10 ADC Driver Performance

The OPA836 device provides excellent performance when driving high-performance delta-sigma (ΔΣ) and

successive-approximation-register (SAR) ADCs in low-power audio and industrial applications.

To show achievable performance, the OPA836 device is tested as the drive amplifier for the ADS8326. The

ADS8326 is a 16-bit, micro power, SAR ADC with pseudodifferential inputs and sample rates up to 250 kSPS.

The device offers excellent noise and distortion performance in a small 8-pin SOIC or VSSOP (MSOP) package.

Low power and small size make the ADS8326 and OPA836 devices an ideal solution for portable and battery-

operated systems, remote data-acquisition modules, simultaneous multichannel systems, and isolated data

acquisition.

With the circuit shown in Figure 9-9 to test the performance, Figure 9-10 shows the FFT plot with a 10-kHz input

signal. The tabulated AC analysis is in Table 9-3.

OPA836, OPA2836

SLOS712J – JANUARY 2011 – REVISED MARCH 2021

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OPA836IDBVT Datasheet(PDF) 36 Page - Texas Instruments

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