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1

t

Converter’s

Full-Scale

InputVoltage

Range

0

0

0

0

ConversionClock

IncorrectResult

CorrectResult

ActualInput

Voltage

InternalDAC

Voltage

WrongBitDecisionMadeHere

ProperSAROperation

SAROperationafter

WrongBitDecision

1

(1

1)

0

1

1

0

ExternalNoise

ConversionStart

(HoldMode)

ADS8513

SLAS486 – JUNE 2007

LAYOUT (continued)

For the ADS8513, error correction is done when the tenth bit is decided. During this bit decision, it is possible to

correct limited errors that may have occurred during previous bit decisions. However, after the tenth bit, no such

correction is possible. Note that for the timing diagrams shown in Figure 3, Figure 6, Figure 7, Figure 8, and

Figure 9 all external digital signals should remain static from 8

μs after the start of a conversion until BUSY rises.

The tenth bit is decided approximately 10

μs to 11 μs into the conversion.

Figure 15. SAR Operation When External Noise Affects the Conversion

18

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Product Folder Link(s): ADS8513