SLOS712I – JANUARY 2011 – REVISED OCTOBER 2016
If the input signal pulses negative from ground, an inverting amplifier is more appropriate as shown in Figure 71.
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.
Signal and bias
from previous stage
Signal and bias to
Figure 71. 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
With the circuit shown in Figure 72 to test the performance, Figure 73 shows the FFT plot with a 10-kHz input
signal . The tabulated AC analysis is in Table 5.
5 V 2.5 V
+In VDD REF
Figure 72. OPA836 and ADS8326 Test Circuit
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