Datasheet

ADC0816, ADC0817
www.ti.com SNAS527C –JUNE 1999–REVISED MARCH 2013
Analog Comparator Inputs
The dynamic comparator input current is caused by the periodic switching of on-chip stray capacitances These
are connected alternately to the output of the resistor ladder/switch tree network and to the comparator input as
part of the operation of the chopper stabilized comparator.
The average value of the comparator input current varies directly with clock frequency and with V
IN
as shown in
Figure 6.
If no filter capacitors are used at the analog or comparator inputs and the signal source impedances are low, the
comparator input current should not introduce converter errors, as the transient created by the capacitance
discharge will die out before the comparator output is strobed.
If input filter capacitors are desired for noise reduction and signal conditioning they will tend to average out the
dynamic comparator input current. It will then take on the characteristics of a DC bias current whose effect can
be predicted conventionally. See AN-258 for further discussion.
Typical Application
*Address latches needed for 8085 and SC/MP interfacing theADC0816, 17 to a microprocessor
Microprocessor Interface Table
PROCESSOR READ WRITE INTERRUPT(COMMENT)
8080 MEMR MEMW INTR (Thru RST Circuit)
8085 RD WR INTR (Thru RST Circuit)
Z-80 RD WR INT (Thru RST Circuit, Mode 0)
SC/MP NRDS NWDS SA (Thru Sense A)
6800 VMA•φ2•R/W VMA•Q
2
•R/W IRQA or IRQB (Thru PIA)
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