Arizona Microtek, Inc.

AZT71

Programmable Capacitive Tuning IC

www.azmicrotek.com

+1-480-962-5881

4

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May 2012, Rev 1.2

Figure 4 – AZT71 Capacitance Value Mapping

The AZT71 is designed to be used in 2 functional modes, Programming and Operational.

In the Programming mode, the AZT71 is used by the manufacturer to set the capacitance value to control the desired

center frequency of the oscillator. The programming mode uses either the shift registers or EEPROM (detailed later) and

gives the manufacturer access to pins DA, CLK, and PV which allow the AZT71 to be programmed with an

accompanying programming board (Figure 5). Arizona Microtek can provide this board (AZPB70) along with software

that works through all the programming steps/functions described in the next sections.

In the Operational mode, the EEPROM internal to the AZT71 has already been programmed with the desired factory

settings. Pins DA, CLK, and PV are to be disconnected, thereby allowing the AZT71’s internal pull-downs to place the

pins at ground potential. In the operational mode, only 3 pins are necessary for hookup (Figure 6).