Datasheet

-140
-120
-100
-80
-60
-40
-20
0
0 20 40 60 80 100 120
f - Frequency - Hz
A - dBc
IN
2.7V
ADS 8326
+In
-In
100
2.2 nF
1k
1k
V
IN
OPA836
V
S-
1k
2 k
2 k
2.5 V5 V
V
S+
V
DD
REF
2.7 V
0
V
V
SIG
1.35
V
V
SIG
OPA836
OPA2836
www.ti.com SLOS712E –JANUARY 2011–REVISED SEPTEMBER 2013
OPA836 and ADS8326 Combined Performance
To show achievable performance, the OPA836 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 250 kSPS. 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 OPA836 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 10 kHz input
frequency showing the spectral performance, and the tabulated AC analysis results are in Table 3.
Figure 79. OPA836 and ADS8326 Test Circuit
Figure 80. ADS8326 and OPA836 10kHz FFT
Table 3. AC Analysis
Tone (Hz) Signal (dBFS) SNR (dBc) THD (dBc) SINAD (dBc) SFDR (dBc)
10k –0.85 83.3 –86.6 81.65 88.9
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