Arizona Microtek, Inc.

AZT71

Programmable Capacitive Tuning IC

www.azmicrotek.com

+1-480-962-5881

4

Request a Sample

Jan 2013, Rev 1.3

In oscillator applications, the AZT71 is designed to be used in 2 phases, Programming and Operational.

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

center frequency of the oscillator. The programming phase gives the manufacturer access to pins DA, CLK, and PV where

the shift registers are used to first determine the required control word. That control word is then stored in the EEPROM

memory. Arizona Microtek can provide the programming board (AZPB70) along with software that works through all the

programming steps/functions described in the next sections (Figure 4).

In the Operational phase, the EEPROM memory 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 5).

AZT71

Programming

Board

DA

CLK

PV

DA

CLK

PV

RESONATOR

OUT

OSCILLATOR

Figure 4 – AZT71 in Programming Mode

AZT71

DA

CLK

PV

RESONATOR

OUT

OSCILLATOR

NC

NC

NC

Figure 5 – AZT71 in Operational Mode