AD9927BBCZ datasheet(79/100 Pages) AD

tên linh kiện	AD9927BBCZ

Giải thích chi tiết về linh kiện	14-Bit CCD Signal Processor with V-Driver and Precision TimingTM Generator

PDF	100 Pages

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nhà sản xuất	AD [Analog Devices]

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79 / 100 page

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:

Connect VDD1 and VDD2 to a 3 V supply and keep V5V low.

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.

Bring the signal driving the diode to V5V high. (Note that

a GPO output can be used for this operation.)

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.

VDD

V5V

Figure 93. Suggested Power-Up Sequence for AD9927 V-Driver Supplies

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