adc0820ccwmx National Semiconductor Corporation, adc0820ccwmx Datasheet - Page 13

• Manufacturer Part Number: adc0820ccwmx
• Description: 8-bit High Speed ?p Compatible A/d Converter With Track/hold Function
• Manufacturer: National Semiconductor Corporation

1.0 Functional Description
Note: MS means most significant
LS means least significant
OTHER INTERFACE CONSIDERATIONS
In order to maintain conversion accuracy, WR has a maxi-
mum width spec of 50 µs. When the MS flash ADC’s
sampled-data comparators (Section 1.2) are in comparison
mode (WR is low), the input capacitors (C, Figure 8 ) must
hold their charge. Switch leakage and inverter bias current
can cause errors if the comparator is left in this phase for too
long.
FIGURE 11. Operating Sequence (WR-RD Mode)
(Continued)
00550120
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Since the MS flash ADC enters its zeroing phase at the end
of a conversion (Section 1.3), a new conversion cannot be
started until this phase is complete. The minimum spec for
this time (t
P
, Figures 2, 3, 4, 5 ) is 500 ns.
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