AZT70 Datasheet, PDF (3/12 Pages) Arizona Microtek, Inc – Programmable Capacitive Tuning IC

Arizona Microtek, Inc.
AZT70
Programmable Capacitive Tuning IC
PROGRAMMING THE AZT70
CONTROL WORD
The capacitance in the AZT70 is controlled by an 11-bit shift register with the data input bit definitions shown in Table 3.
The control word data is inputted serially on the rising edge of the CLK signal with bit0 first and bit10 last.
Table 3 - AZT70 Control Word Definition
bit10
Not Used
bit9
Not Used
11-bit Control Word
bit8 bit7 bit6 bit5 bit4 bit3 bit2 bit1
C_mid
C_lo
MSB --- LSB MSB --- ---
--- LSB
bit0
Not Used
The control word mapping is a binary word for each of C_mid and C_lo where higher number bits are more significant. Figure
2 shows the capacitance value mapping for the AZT70. The detailed Nominal Capacitance Binary Mapping can be located
on the AZM website.
www.azmicrotek.com
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Figure 2 – AZT70 Capacitance Value Mapping
3
May 2012, Rev 1.2