ZiLOG Z80-AIO Hardware User Manual page 18

FIGURE 3.5.5.1.
For a gain of l (set at factory), multiplexer settling time
external factor which affects the multiplexer settling time
A circuit roodel of an "Cn" channel is shown in
at the Output of the multiplexer must be allowed to settle to
accuracy of the System.
calculated with the formula: Ts = (Rs + Ron) Co.
source resistance of 1k, Ts = (l + 1.8k) x 50pF = 14 Ons.
Thus, 1.20us is needed to settle to +0.01%.
accuracy of the System, is therefore, preserved.
sources may be accurately handled by placing a large
such a capacitance, the multiplexer time constant becomes
90ns. If this method cannot be used, the time allowed for
settling can be increased äs described in the section on low
On Channel Multiplexer Circuit for
The input capacitance (Cl) of 50pF for
The multiplexer time constant can be
10
The only
The Signal
For a
The
An analysis of such
For