AD9557SLASHPCBZ datasheet(76/92 Pages) AD

76 / 92 page

AD9557

Data Sheet

Rev. A | Page 76 of 92

REFERENCE INPUTS (REGISTER 0x0600 TO REGISTER 0x0602)

Table 72. Reference Power-Down1

Address

Bits

Bit Name

Description

[7:2]

Reserved

Reserved.

REFB power-down

Powers down REFB input receiver.

0 (default) = not powered down.

1 = powered down.

0x0600

REFA power-down

Powers down REFA input receiver.

0 (default) = not powered down.

1 = powered down.

1When all bits are set, the reference receiver section enters a deep sleep mode.

Table 73. Reference Logic Family

Address

Bits

Bit Name

Description

[7:4]

Reserved

Reserved.

[3:2]

REFB logic type

Selects logic family for REFB input receiver; only REFB_P is used in CMOS mode.

00 (default) = differential.

01 = 1.2 V to 1.5 V CMOS.

10 = 1.8 V to 2.5 V CMOS.

11 = 3.0 V to 3.3 V CMOS.

0x0601

[1:0]

REFA logic type

The REFA logic type settings are the same as Register 0x0601[3:2] for REFB.

Table 74. Reference Priority Setting

Address

Bits

Bit Name

Description

[7:4]

Reserved

Reserved.

[3:2]

REFB priority

User assigned priority level (0 to 3) of the reference associated with REFB, which ranks

that reference relative to the others.

00 (default) = 0.

01 = 1.

10 = 2.

11 = 3.

0x0602

[1:0]

REFA priority

The REFA priority settings are the same as in Register 0x0602[3:2] for REFB.

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