AZT71_1301 Datasheet, PDF (4/14 Pages) Arizona Microtek, Inc – Programmable Capacitive Tuning IC

Arizona Microtek, Inc.
AZT71
Programmable Capacitive Tuning IC
OSCILLATOR APPLICATION
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).
DA
Programming
Board CLK
(AZPB70)
PV
VDD
DA
AZT71
X1
CLK
PV
VSS
OUT
RESONATOR
OSCILLATOR
Figure 4 – AZT71 in Programming Mode
NC
VDD
DA
AZT71
X1
NC
CLK
NC
PV
VSS
OUT
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RESONATOR
OSCILLATOR
Figure 5 – AZT71 in Operational Mode
4
Jan 2013, Rev 1.3