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AD9531

Data Sheet

Address

Bits

Bit Name

Description

[D2:D1]

Polarity [1:0]

Configure OUT1_2x polarity as follows (applies to CMOS only):

00: OUT1_2P normal, OUT1_2N inverted.

01: OUT1_2P normal, OUT1_2N normal.

10: OUT1_2P inverted, OUT1_2N inverted.

11: OUT1_2P inverted, OUT1_2N normal.

Power-down

0: OUT1_2x driver active.

1: OUT1_2x driver powered down.

0x0114

[D7:D6]

Unused

Unused.

[D5:D3]

Logic mode [2:0]

Configure the OUT1_3x output driver as follows:

000: disabled.

001: HSTL.

010: undefined.

011: undefined.

100: 1.8 V CMOS, OUT1_3P active, OUT1_3N active.

101: 1.8 V CMOS, OUT1_3P active, OUT1_3N disabled.

110: 1.8 V CMOS, OUT1_3P disabled, OUT1_3N active.

111: undefined.

[D2:D1]

Polarity [1:0]

Configure OUT1_3x polarity as follows (applies to CMOS only):

00: OUT1_3P normal, OUT1_3N inverted.

01: OUT1_3P normal, OUT1_3N normal.

10: OUT1_3P inverted, OUT1_3N inverted.

11: OUT1_3P inverted, OUT1_3N normal.

Power-down

0: OUT1_3x driver active.

1: OUT1_3x driver powered down.

Registers for PLL1 Group 1B Outputs, OUT1_4x to OUT1_7x—Register 0x0115 to Register 0x0119

Table 60. PLL1 Group 1B Outputs Register Details

Address

Bits

Bit Name

Description

0x0115

[D7:D0]

D1B [7:0]

D1B divider Bit D7 (MSB) to Bit D0 (LSB). The divide factor is the value of D1B [7:0] + 1. D1B powers

down when all four of the associated output drivers power down, whether via the power-down bit

or via the logic mode bits.

0x0116

[D7:D6]

Unused

Unused.

[D5:D3]

Logic mode [2:0]

Configure the OUT1_4x output driver as follows:

000: disabled.

001: HSTL.

010: undefined.

011: undefined.

100: 1.8 V CMOS, OUT1_4P active, OUT1_4N active.

101: 1.8 V CMOS, OUT1_4P active, OUT1_4N disabled.

110: 1.8 V CMOS, OUT1_4P disabled, OUT1_4N active.

111: undefined.

[D2:D1]

Polarity [1:0]

Configure OUT1_4x polarity as follows (applies to CMOS only):

00: OUT1_4P normal, OUT1_4N inverted.

01: OUT1_4P normal, OUT1_4N normal.

10: OUT1_4P inverted, OUT1_4N inverted.

11: OUT1_4P inverted, OUT1_4N normal.

Power-down

0: OUT1_4x driver active.

1: OUT1_4x driver powered down.

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