AZT71 Datasheet, PDF (4/14 Pages) Arizona Microtek, Inc – Programmable Capacitive Tuning IC

Arizona Microtek, Inc.
AZT71
Programmable Capacitive Tuning IC
Figure 4 – AZT71 Capacitance Value Mapping
AZT71 FUNCTIONAL MODES
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).
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May 2012, Rev 1.2