AZT70 Datasheet, PDF (4/12 Pages) Arizona Microtek, Inc – Programmable Capacitive Tuning IC

Arizona Microtek, Inc.
AZT70
Programmable Capacitive Tuning IC
AZT70 FUNCTIONAL MODES
The AZT70 is designed to be used in 2 functional modes, Programming and Operational.
In the Programming mode, the AZT70 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 AZT70 to be programmed with an
accompanying programming board (Figure 3). 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 AZT70 has already been programmed with the desired factory
settings. Pins DA, CLK, and PV are to be disconnected, thereby allowing the AZT70’s internal pull-downs to place the
pins at ground potential. In the operational mode, only 3 pins are necessary for hookup (Figure 4).
DA
Programming
Board ^CLK
(PRT70)
PV
VDD
DA
AZT70
X1
CLK
PV
VSS
OUT
RESONATOR
Figure 3 – AZT70 in Programming Mode
OSCILLATOR
NC
VDD
DA
AZT70
X1
NC
CLK
NC
PV
VSS
OUT
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RESONATOR
OSCILLATOR
Figure 4 – AZT70 in Operational Mode
4
May 2012, Rev 1.2