AD9981SLASHPCB datasheet(28/44 Pages) AD

28 / 44 page

AD9981

Preliminary Technical Data

Rev. 0 | Page 28 of 44

Hexadecimal

Address

Read and

Write or

Read Only

Bits

Default

Value

Description

0x26

7:0

Hsyncs Per Vsync

MSBs

MSBs of Hsyncs per Vsync count.

0x27

7:4

Hsyncs Per

Vsync LSBs

LSBs of Hsyncs per Vsync count.

0x28

R/W

7:0

1011 1111

TestReg1

Must be written to 0xBF for proper operation.

0x29

R/W

7:0

0000 0010

TestReg2

Must be written to 0x02 for proper operation.

0x2A

7:0

TestReg3

Read only bits for future use.

0x2B

7:0

TestReg4

Read only bits for future use.

0x2C

R/W

7:5

000* ****

Offset Hold

Must be written to default for proper operation.

***0 ****

Auto-Offset Hold.

Disables the auto-offset and holds the feedback result.

0 = One time update.

1 = Continuous update.

3:0

**** 0000

Must be written to default for proper operation.

0x2D

R/W

7:0

1111 0000

TestReg5

Must be written to 0xE8 for proper operation.

0x2E

R/W

7:0

1111 0000

TestReg6

Must be written to 0xE0 for proper operation.

1 Functions with more than eight control bits, such as PLL divide ratio, gain, and offset, are only updated when the LSBs are written to (for example, Register 0x02 for

PLL divide ratio).

AD9981/PCB 데이터시트(PDF) 28 Page - Analog Devices

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