ADS9217 datasheet(53/68 Pages) TI2

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9.2.2 Data Acquisition (DAQ) Circuit for a ≤100kHz Input Signal Bandwidth

Figure 9-4 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.

–

47pF

VOCM

THS4551

270pF

RFB

270pF

RFB

470pF

47pF

ADC

–

VCMOUT

AINM

AINP

ADS91XX

Differential Source

Single-ended Source

RFB = 1k

for Gain = 1 or

RFB = 4.02k

for Gain = 4

Figure 9-4. Data Acquisition (DAQ) Circuit for a ≤100kHz Input Signal Bandwidth

9.2.2.1 Design Requirements

Table 9-2 lists the parameters for this typical application.

Table 9-2. Design Parameters

PARAMETER

VALUE

SNR

≥ 91dB

THD

≤ –110dB

Input signal frequency

≤ 100kHz

9.2.2.2 Application Curves

Figure 9-5 and Figure 9-6 show the FFT plots for the circuit in Figure 9-4.

Frequency (kHz)

0.5

2 3 4 5 7 10 2030 50 100 200

500 1000

5000

-180

-150

-120

-90

-60

-30

fIN = 100kHz, SNR = 95.5dBFS, THD = –118.2dB

Figure 9-5. Typical FFT at 10MSPS/Channel:

ADS9118

Frequency (kHz)

0.5

2 3 4 5 7 10

20 30 50 100 200

500 1000

3000

-180

-150

-120

-90

-60

-30

fIN = 100kHz, SNR = 95.4dBFS, THD = –120dB

Figure 9-6. Typical FFT at 5MSPS/Channel:

ADS9117

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ADS9117, ADS9118, ADS9119

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ADS9217 Datasheet(PDF) 53 Page - Texas Instruments

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