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AZT71QG Datenblatt(PDF) 3 Page - Arizona Microtek, Inc

Teilenummer AZT71QG
Bauteilbeschribung  Programmable Capacitive Tuning IC
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Hersteller  AZM [Arizona Microtek, Inc]
Direct Link  http://azmicrotek.com
Logo AZM - Arizona Microtek, Inc

AZT71QG Datenblatt(HTML) 3 Page - Arizona Microtek, Inc

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Arizona Microtek, Inc.
AZT71
Programmable Capacitive Tuning IC
www.azmicrotek.com
+1-480-962-5881
3
Request a Sample
May 2012, Rev 1.2
ENGINEERING NOTES
CAPACITOR STRUCTURE
The AZT71 capacitance value is composed of four parallel capacitors banks, CF is a fixed capacitor value of 6.6pF and
Chi, Cmid & Clo are variable capacitors of differing ranges and resolutions as seen in Table 4. Capacitors composing Chi,
Cmid and Clo are set with a binary control word through an 11-bit shift register described in PROGRAMMING THE AZT71.
The values of each Chi, Cmid and Clo stepping are detailed in the complete Nominal Capacitance Binary Mapping
spreadsheet.
CTotal = CF + Chi + Cmid + Clo
Table 4 - AZT71 Capacitor Structure
Internal
Capacitor
Min Value
(pF)
Max Value
(pF)
Step Size
(pF)
CF
6.6
6.6
n/a
Chi
0
19.2
6.4
Cmid
0
9.8
1.4
Clo
0
1.953
0.063
Total
6.6
37.553
PROGRAMMING THE AZT71
CONTROL WORD
The capacitance in the AZT71 is controlled by an 11-bit shift register with the data input bit definitions shown in Table 5.
The control word data is inputted serially on the rising edge of the CLK signal with bit0 first and bit10 last.
Table 5 - AZT71 Control Word Definition
11-bit Control Word
bit10
bit9
bit8
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Chi
Cmid
Clo
Not Used
MSB
LSB
MSB
---
LSB
MSB
---
---
---
LSB
The control word mapping is a binary word for each of Chi, Cmid and Clo where higher number bits are more significant.
Figure 4 shows the capacitance value mapping for the AZT71. The detailed Nominal Capacitance Binary Mapping can be
located on the AZM website.


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