ISL22313 Datasheet, PDF (14/15 Pages) Intersil Corporation – Single Digitally Controlled Potentiometer XDCP

ISL22313
increments by one during transmission of each Data Byte.
After reaching the memory location 0Fh, the pointer “rolls
over” to 00h, and the device continues to output data for
each ACK received.The master terminates the read
operation issuing a NACK (ACK ) and a STOP condition
following the last bit of the last Data Byte (see Figure 19).
Applications Information
When stepping up through each tap in voltage divider mode,
some tap transition points can result in noticeable voltage
transients (or overshoot/undershoot) resulting from the
sudden transition from a very low impedance “make” to a
much higher impedance “break within an extremely short
period of time (<50ns). Two such code transitions are EFh to
F0h, and 0Fh to 10h. Note that all switching transients will
settle well within the settling time as stated in the datasheet.
A small capacitor can be added externally to reduce the
amplitude of these voltage transients, but that will also
reduce the useful bandwidth of the circuit, thus this may not
be a good solution for some applications. It may be a good
idea, in that case, to use fast amplifiers in a signal chain for
fast recovery.
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FN6421.0
July 17, 2007