ADC0803 datasheet(17/43 Pages) TI1

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Typical Applications (Continued)

Functional Description

1.0 UNDERSTANDING A/D ERROR SPECS

A perfect A/D transfer characteristic (staircase waveform) is

shown in

Figure 1. The horizontal scale is analog input

voltage and the particular points labeled are in steps of 1

LSB (19.53 mV with 2.5V tied to the V

REF/2 pin). The digital

output codes that correspond to these inputs are shown as

D−1, D, and D+1. For the perfect A/D, not only will

center-value (A−1, A, A+1, .... ) analog inputs produce

the correct output digital codes, but also each riser (the

transitions between adjacent output codes) will be located

±1⁄2 LSB away from each center-value. As shown, the risers

are ideal and have no width. Correct digital output codes will

be provided for a range of analog input voltages that extend

Sampling an AC Input Signal

DS005671-78

Note 11: Oversample whenever possible [keep fs > 2f(−60)] to eliminate input frequency folding (aliasing) and to allow for the skirt response of the filter.

Note 12: Consider the amplitude errors which are introduced within the passband of the filter.

70% Power Savings by Clock Gating

DS005671-79

(Complete shutdown takes

≈ 30 seconds.)

Power Savings by A/D and V

REF Shutdown

DS005671-80

*Use ADC0801, 02, 03 or 05 for lowest power consumption.

Note: Logic inputs can be driven to VCC with A/D supply at zero volts.

Buffer prevents data bus from overdriving output of A/D when in shutdown mode.

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