ADS9217 datasheet(51/68 Pages) TI2

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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

The ADS911x features an integrated ADC driver, low latency, high speed, low AC and DC errors, and low

temperature drift. These features make the ADS911x a high-performance signal-chain for applications requiring

precision measurements with low latency. The following section provides example circuits and recommendations

for using the ADS911x device family in a data acquisition (DAQ) system.

9.2 Typical Applications

9.2.1 Data Acquisition (DAQ) Circuit for a ≤20kHz Input Signal Bandwidth

Figure 9-1 shows a signal-chain with minimum external components. This signal-chain significantly reduces

solution size by driving the ADS911x with the fully differential amplifier (FDA) THS4551.

–

270pF

VOCM

THS4551

1nF

2.2

10nF

270pF

ADC

–

VCMOUT

AINM

AINP

ADS91XX

Differential Source

Single-ended Source

Figure 9-1. Data Acquisition (DAQ) Circuit for a ≤20kHz Input Signal Bandwidth

9.2.1.1 Design Requirements

Table 9-1 lists the parameters for this typical application.

Table 9-1. Design Parameters

PARAMETER

VALUE

SNR

≥ 92dB

THD

≤ –110dB

Input signal frequency

≤ 20kHz

9.2.1.2 Detailed Design Procedure

Use the procedure discussed in this section for any ADS911x application circuit.

• All ADS911x applications require supply decoupling, as provided in the Power Supply Recommendations

section.

• Make sure the values provided in the Typical Applications section meet the maximum throughput and input

signal frequency design requirements. Use a lower bandwidth signal chain when lower noise performance is

required.

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