Arizona Microtek, Inc.

AZT70

Programmable Capacitive Tuning IC

www.azmicrotek.com

+1-480-962-5881

9

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May 2012, Rev 1.2

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.