OPA835IDBVT datasheet(37/53 Pages) NSC

37 / 53 page

-140

-120

-100

-80

-60

-40

-20

100

120

f - Frequency - Hz

2.7V

ADS 8326

+In

-In

100

2.2 nF

2 k

VIN

OPA835

VS-

2 k

4.02 k

2.5 V

5 V

VS+

VDD

REF

2.7 V

0 V

VSIG

1.35 V

VSIG

OPA835

OPA2835

www.ti.com

SLOS713E – JANUARY 2011 – REVISED JULY 2013

OPA835 and ADS8326 Combined Performance

To show achievable performance, the OPA835 is tested as the drive amplifier for the ADS8326. The ADS8326 is

a 16-bit, micro power, SAR ADC with pseudo-differential inputs and sample rates up to 250kSPS. It 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 OPA835 an ideal solution for portable and battery-operated systems, for

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

The circuit shown in Figure 79 is used to test the performance, Figure 80 is the FFT plot with 10kHz input

frequency showing the spectral performance, and the tabulated AC analysis results are in Table 3.

Figure 79. OPA835 and ADS8326 Test Circuit

Figure 80. ADS8326 and OPA835 10kHz FFT

Table 3. AC Analysis

Tone (Hz)

Signal (dBFS)

SNR (dBc)

THD (dBc)

SINAD (dBc)

SFDR (dBc)

10k

–0.85

81.9

–87.5

80.8

89.9

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OPA835IDBVT Datasheet(PDF) 37 Page - National Semiconductor (TI)

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