ADC

Rsource

1 nF

Rsource

Rsource

1 nF

1 nF

REF3240

OPA320

10 µF

±

+

REF+

/CS

I/O CLOCK

DATA IN

EOC

DATA OUT

2.5

1 k

1 µF

TLV2553

www.ti.com

SLAS354C – SEPTEMBER 2001 – REVISED SEPTEMBER 2015

Application Information (continued)

•

The stability of the ADC reference input voltage, which is a DC signal, is critical for ADC accuracy. The

reference source experiences large instantaneous changes in load current during the ADC conversion phase,

and therefore, low source impedance is required for excellent load regulation and stability.

9.2 Typical Application

Figure 41 shows a typical application where the TLV2553 is used to acquire multiple AC signals while operating

at its maximum sampling rate of 200 KSPS.

Figure 41. Typical Application Block Diagram

9.2.1 Design Requirements

The design is optimized for superior dynamic performance (low harmonic distortion, high ENOB) while the ADC

is multiplexing input channels at maximum sampling rate. Of course, the underlying assumption, based on , is

that the bandwidths of the input signals are much less than 100 kHz. For example, according to , the TLV2553

provides better than 11.5 ENOB for AC inputs less than 10 kHz.

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