AD9981SLASHPCB datasheet(26/44 Pages) AD

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AD9981

Preliminary Technical Data

Rev. 0 | Page 26 of 44

Hexadecimal

Address

Read and

Write or

Read Only

Bits

Default

Value

Description

**1* ****

Programmable Bandwidth.

0 = Low analog input bandwidth.

1 = High analog input bandwidth.

***1 ****

Power-Down Control Select.

0 = Manual power-down control.

1 = Auto power-down control.

**** 0***

Power-Down.

0 = Normal operation.

1 = Power-down.

**** *0**

Power-Down Pin Polarity.

0 = Active low.

1 = Active high.

**** **0*

Power-Down Fast Switching Control.

0 = Normal power-down operation.

1 = The chip stays powered up and the outputs are put in high

impedance mode.

**** ***0

SOGOUT High Impedance Control.

0 = SOGOUT operates as normal during power-down.

1 = SOGOUT is in high impedance during power-down.

0x1F

R/W

7:5

100* ****

Output Select 1

Output Mode.

100 = 4:4:4 output mode.

101 = 4:2:2 output mode.

110 = 4:4:4—DDR output mode.

***1 ****

Primary Output Enable.

0 = Primary output is in high impedance state.

1 = Primary output is enabled.

**** 0***

Secondary Output Enable.

0 = Secondary output is in high impedance state.

1 = Secondary output is enabled.

2:1

**** *10*

Output Drive Strength.

00 = Low output drive strength.

01 = Medium low output drive strength.

10 = Medium high output drive strength.

11 = High output drive strength.

Applies to all outputs except VSOUT.

**** ***0

Output Clock Invert.

0 = Noninverted pixel clock.

1 = Inverted pixel clock.

Applies to all clocks output on DATACK.

0x20

R/W

7:6

0*** ****

Output Select 2

Output Clock Select.

00 = Pixel clock.

01 = 90° phase shifted pixel clock.

10 = 2× pixel clock.

11 = 40 MHz internal clock.

*0** ****

Output High Impedance.

0 = Normal outputs.

1 = All outputs except SOGOUT in high impedance mode.

**0* ****

SOG High Impedance.

0 = Normal SOG output.

1 = SOGOUT pin is in high impedance mode.

***0 ****

Field Output Polarity.

Sets the polarity of the field output signal.

0 = Active low => even field, active high => odd field.

1 = Active low => odd field, active high => even field.

**** 1***

PLL Sync Filter Enable.

0 = PLL uses raw Hsync/SOG.

1 = PLL uses filtered Hsync/SOG.

AD9981/PCB 数据表(PDF) 26 Page - Analog Devices

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