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Electrical Characteristics (Continued)

Note 7: A diode exists between AV

and DV

as shown below.

TL/H/11025–5

To guarantee accuracy, it is required that the AV

and DV

be connected together to a power supply with separate bypass filters at each V

pin.

Note 8: Accuracy is guaranteed at f

CLK

3.5 MHz. At higher or lower clock frequencies accuracy may degrade, see the typical performance characteristic curves.

Note 9: Typicals are at T

C and represent most likely parametric norm.

Note 10: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 11: Positive linearity error is defined as the deviation of the analog value, expressed in LSBs, from the straight line that passes through positive full scale and

zero. For negative linearity error the straight line passes through negative full scale and zero. (See

Figures 1b

and

Note 12: The ADC12451’s self-calibration technique ensures linearity, full scale, and offset errors as specified, but noise inherent in the self-calibration process will

result in a repeatability uncertainty of

0.20 LSB.

Note 13: If T

changes then an Auto-Zero or Auto-Cal cycle will have to be re-started, see the typical performance characteristic curves.

Note 14: After an Auto-Zero or Auto-Cal cycle at the specified power supply extremes.

Note 15: When using the WR

control to start a conversion if the clock is asynchronous to the rising edge of WR an uncertainty of one clock period will exist in the

end of the interval of t

, therefore making t

end a minimum 6 clock periods or a maximum 7 clock periods after the rising edge of WR. If the falling edge of the

clock is synchronous to the rising edge of WR

then t

will end exactly 6.5 clock periods after the rising edge of WR. This does not occur when S/H control is used.

Note 16: The CAL

line must be high before a conversion is started.

Note 17: The specifications for these parameters are valid after an Auto-Cal cycle has been completed.

Note 18: The ADC12451 reference ladder is composed solely of capacitors.

Note 19: A military RETS electrical test specification is available on request. At time of printing, the ADC12451CMJ/883 RETS specification complies fully with the

boldface limits in this column.

TL/H/11025–6

FIGURE 1a. Transfer Characteristic

1 2 3 4 5 6 7 8 9 10 11 ... 17 18

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