AZT70 Datasheet, PDF (9/12 Pages) Arizona Microtek, Inc – Programmable Capacitive Tuning IC

Arizona Microtek, Inc.
AZT70
Programmable Capacitive Tuning IC
PROGRAMMING VOLTAGE LIMIT CIRCUIT
Some existing programming circuits use a current source connected to a 6.5 – 8.0 V supply. That circuit produces an
excessive voltage on the PV pin, which can damage the AZT70. A simple modification eliminates the issue and maintains
full programming compatibility with existing programming methods. A 5.6 V, ½ watt Zener, 1N5232B or equivalent,
placed between the PV pin and ground will limit the voltage while still allowing the programming circuit to generate the
current required for programming fuse link type parts.
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May 2012, Rev 1.2