AZT71 Datasheet, PDF (5/14 Pages) Arizona Microtek, Inc – Programmable Capacitive Tuning IC

Arizona Microtek, Inc.
DA
Programming
Board ^CLK
(PRT70)
PV
AZT71
VDD
DA
AZT71
X1
CLK
PV
VSS
Programmable Capacitive Tuning IC
OUT
RESONATOR
Figure 5 – AZT71 in Programming Mode
OSCILLATOR
NC
VDD
DA
AZT71
X1
NC
CLK
NC
PV
VSS
OUT
RESONATOR
OSCILLATOR
Figure 6 – AZT71 in Operational Mode
PROGRAMMING MODES
The AZT71 has two capacitance setting modes from which bits are set and the matching capacitors are selected.
• Reading directly from the shift register
o This is useful for testing the capacitance and subsequent oscillator frequency. This mode is active after
the last bit is shifted in and when the CLK pin is left logic high. For the shift register, capacitors are
selected when bits are active HIGH.
• Reading from the value contained in the EEPROM
o Prevents customer adjustment and retains factory programming and is active when the CLK pin is at logic
low or not connected. For the EEPROM, capacitors are selected when bits are active LOW.
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May 2012, Rev 1.2