9 Application and Implementation

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, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

Many applications, such as event-triggered and multiplexed data-acquisition systems, require the very first

conversion of the ADC to have 18-bit or greater precision. These types of data acquisition systems capture

data in bursts, and are also called burst-mode, data-acquisition systems. Achieving 18-bit precision for the first

sample is very difficult using a conventional voltage reference because the voltage reference droop limits the

accuracy of the first few conversions. Furthermore, variable-sampling-rate systems require that the gain error of

the system does not vary with sampling rate. The primary objective of this design example is to demonstrate the

lowest distortion and noise, burst-mode data-acquisition block with low power consumption, using an 18-bit SAR

ADC operating at a throughput of 1MSPS, for a 1kHz, full-scale, pure sine-wave input.

9.2 Typical Application

Bandgap

Voltage

Reference

CFILT = 1 µF

CL = 47 µF

RESR = 5 PŸ

RFILT

Buffer

+

VIN

OUT_S

OUT_F

FILT

VIN

GND_S

GND_F

Power Supply

SS

REF60xx

RLIM = 120 NŸ

EN

GND

REF

+

VIN

R = 1 NŸ

RF = 5 Ÿ

CF = 10 nF

THS4521

AINP

AINN

ADS8881

Copyright © 2016, Texas Instruments Incorporated

R = 1 NŸ

R = 1 NŸ

R = 1 NŸ

RF = 5 Ÿ

Power Supply

Figure 9-1. 18-bit, 1MSPS, Burst-Mode Data Acquisition system

9.2.1 Design Requirements

1. Burst-mode support (see Section 7.3 for more details)

2. ENOB > 16 bits

3. THD < –120dB

4. Power consumption < 50mW

5. Throughput = 1MSPS

REF60

SBOS708C – MAY 2016 – REVISED APRIL 2026

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