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AZT71HG bảng dữ liệu(PDF) 7 Page - Arizona Microtek, Inc

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Giải thích chi tiết về linh kiện  Programmable Capacitive Tuning IC
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Arizona Microtek, Inc.
AZT71
Programmable Capacitive Tuning IC
www.azmicrotek.com
+1-480-962-5881
7
Request a Sample
Jan 2013, Rev 1.3
For an example of writing bits into the EEPROM, suppose the desired capacitance is 7.23pF. The control word becomes
‘00000010100’ (Figure 8). Also suppose the EEPROM bits have been erased and therefore logic high (The AZT71 is
initially shipped in this condition). Since bit0 is the first bit to be loaded, the bit sequence becomes 0-0-1-0-1-0-0-0-0-0-0.
However, as described before, selecting bits for the EEPROM are active LOW, which will invert the logical values in the
sequence to 1-1-0-1-0-1-1-1-1-1-1 (Figure 9). Note the differences between the EEPROM bits and the converted control
word. Since there are 2 differences, two write cycles are required as only 1 bit should be written at a time. Figure 10
shows the timing for bit2 while Figure 11 shows the timing for bit4.
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
bit 8
bit 9
bit 10
Figure 8 – Desired control word
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
bit 8
bit 9
bit 10
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
bit 8
bit 9
bit 10
DA
EEPROM
difference
difference
Figure 9 – Converted control word and differences from known EEPROM states
t
DA
CLK
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
bit 8
bit 9
bit 10
bit 0
loaded 1st
bit 10
loaded last
PV
4µs
min
10ms
min
≥5.6V,
≤6.1V
Figure 10 – First programming cycle to program bit2 into the EEPROM


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