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AZT71QG Datenblatt(PDF) 3 Page - Arizona Microtek, Inc |
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AZT71QG Datenblatt(HTML) 3 Page - Arizona Microtek, Inc |
3 / 14 page 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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Ähnliche Beschreibung - AZT71QG |
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