ADS7039-Q1 Datasheet, PDF (20/32 Pages) Texas Instruments – Small-Size, Low-Power, 10-Bit, 2-MSPS, SAR ADC

ADS7039-Q1
SBAS788 – JANUARY 2017
9 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The two primary circuits required to maximize the performance of a SAR ADC are the input driver and the
reference driver circuits. This section details some general principles for designing the input driver circuit,
reference driver circuit, and provides some application circuits designed for the ADS7039-Q1.
9.2 Typical Application
+
VSOURCE ^±
OPA_VDD
±
33
+
OPA365-Q1
GND
1 nF
AVDD
VDD
VIN
TI Device
GND
Input Driver
Device: 12-Bit , 2-MSPS,
Single-Ended Input
Copyright © 2016, Texas Instruments Incorporated
Figure 38. Single-Supply DAQ with the ADS7039-Q1
9.2.1 Design Requirements
The goal of this application is to design a single-supply digital acquisition (DAQ) circuit based on the ADS7039-
Q1 with SNR greater than 61 dB and THD less than –75 dB for input frequencies of 2 kHz at a throughput of
2 MSPS.
9.2.2 Detailed Design Procedure
The input driver circuit for a high-precision ADC mainly consists of two parts: a driving amplifier and a charge
kickback filter. Careful design of the front-end circuit is critical to meet the linearity and noise performance of a
high-precision ADC.
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