CS5571(2007) View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS5571
(Rev.:2007)

±2.5 V / 5 V, 100 kSps, 16-bit, High-throughput ∆Σ ADC

Cirrus Logic 

6/25/07

14:12

CS5571

This excellent DNL performance impacts small-signal performance. For small signals, an error in the size

of a code represents a much greater percentage of the signal than with a full-scale input signal. Figure

10 illustrates the small-signal performance of the CS5571. The signal is at -80 dB from full scale. There-

fore, the input is at 1/10,000th of full scale, having a peak-to-peak magnitude of only a few codes. Excel-

lent DNL and proper dither allows the CS5571 to achieve high spectral purity with very small signals.

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Input Signal = 1 kHz @ -80 dB

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64k Samples @ 100 kSps

DITHER ON

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-120

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Figure 10. CS5571 Small Signal Performance (Dither On)

0

Input Signal = 1 kHz @ -80 dB

-20

64k Samples @ 100 kSps

DITHER OFF

-40

-60

-80

-100

-120

-140

-160

-180

0

5k

10k

15k

20k

25k

30k

35k

40k

45k

50k

Frequency (Hz)

Figure 11. CS5571 Small Signal Performance (Dither Off)

Figure 11 illustrates the performance of the CS5571 under the same signal conditions as figure 10 but

with DITHER set to OFF. For small signals, good DNL alone is not adequate as the quantization itself can

DS768A5

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