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AD9927BBCZ 데이터시트(PDF) 79 Page - Analog Devices

부품명 AD9927BBCZ
상세설명  14-Bit CCD Signal Processor with V-Driver and Precision TimingTM Generator
PDF  100 Pages
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제조업체  AD [Analog Devices]
홈페이지  http://www.analog.com
Logo AD - Analog Devices

AD9927BBCZ 데이터시트(HTML) 79 Page - Analog Devices

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AD9927
Rev. 0 | Page 79 of 100
V-Driver Power Supply Sequencing
When powering up the V-driver of the AD9927, it is important
to pay attention to the order that the various V-driver power
supplies are turned on. Particularly, a bias voltage of 2.3 V or
greater must be applied to the V5V pin prior to powering up the
VH and VL supplies. V5V is an internal voltage that eventually
rises to ~5.4 V after VH and VL are powered up; therefore, it
needs to be driven through a diode. A Schottky diode is
recommended to maximize the bias voltage on V5V. To ensure
proper operation, adhere to the following steps:
1.
Connect VDD1 and VDD2 to a 3 V supply and keep V5V low.
2.
Perform any necessary writes to Registers 0x25 and 0x26
(VT_STBY12 and VT_STBY3, respectively) to define the
polarities of the V-driver outputs prior to powering up the
VH and VL supplies.
3.
Bring the signal driving the diode to V5V high. (Note that
a GPO output can be used for this operation.)
4.
After V5V reaches a minimum of 2.3 V, VH and VL can be
powered on. There are no restrictions to the order in which
VH and VL can be powered on at this time.
0V
VDD
VL
V5V
VH
Figure 93. Suggested Power-Up Sequence for AD9927 V-Driver Supplies



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