ADS9120 Datasheet, PDF (50/64 Pages) Texas Instruments – 16-Bit, 2.5-MSPS, 15.5-mW, SAR ADC

ADS9120
SBAS710 – SEPTEMBER 2016
8.2 Typical Application
30 k
10 pF
499
1k
4.7
220 nF
-
OPA625
++
OPA+
0.1 µF
2.49 k
4.99 k
www.ti.com
0.1 µF
Reference Drive Circuit
-
OPA378
++
OPA+
1k
1 µF
OPA+
REF5045
(See Reference Datasheet
for Detailed Pin Configuration)
-VDIFF/2
VINCM = 0 V
1k
1.18 VDC
1 µF
+VDIFF/2
1k
1 nF
1k
-
OPA625
+
+
OPA625
-
1k
1 nF
10 nF
2.2
2.2
10 nF
Input Driver
10 µF
10 µF
10 µF
REFM REFP REFP REFM
AINP
V+
AINM
TI Device
CONVST
CONVST
GND AVDD DVDD
GND
AVDD DVDD
SAR ADC
Copyright © 2016, Texas Instruments Incorporated
Figure 93. Differential Input DAQ Circuit for Lowest Distortion and Noise at 2.5 MSPS
8.2.1 Design Requirements
Design an application circuit optimized for using the ADS9120 to achieve:
• > 95-dB SNR, < –118-dB THD
• ±0.5-LSB linearity and
• Maximum-specified throughput of 2.5 MSPS
50
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Copyright © 2016, Texas Instruments Incorporated