AD9974BBCZ datasheet(44/52 Pages) AD

44 / 52 page

AD9974

Rev. A | Page 44 of 52

Table 25. I/O Control Registers

Address

Data Bit

Content

Default

Value

Update

Name

Description

0x23

[0]

SCK

TESTMODE

Test Operation Only. Set to 0.

[1]

TESTMODE

Test Operation Only. Set to 0.

[2]

IO_NVR

IOVDD Voltage Range for VD, HD, SCK, SDATA, and SL.

0 = 1.8 V.

1 = 3.3 V.

The I/Os are 3 V tolerant, so there is no problem having higher

than 1.8 V inputs at start-up, but this register should be set to 1

at initialization if using higher than 1.8 V supplies.

[3]

DATA_NVR

DRVDD Voltage Range.

[4]

TESTMODE

Test Operation Only. Set to 0.

[7:5]

HCLKMODE

Selects HCLK output configuration (see Table 9).

[27:8]

Unused

Set unused bits to 0.

0x24

[27:0]

TESTMODE

Test Operation Only. Set to 0 if this register is accessed.

0x25

[27:0]

TESTMODE

Test Operation Only. Set to 0 if this register is accessed.

0x26

[27:0]

TESTMODE

Test Operation Only. Set to 0 if this register is accessed.

0x27

[27:0]

TESTMODE

Test Operation Only. Set to 0 if this register is accessed.

Table 26. Mode Registers

Address

Data Bit

Content

Default

Value

Update

Name

Description

0x28

[4:0]

HPATNUM

Total Number of H-Pattern Groups.

[27:5]

Unused

Set unused bits to 0.

0x29

[27:0]

Unused

Set unused register to 0 if accessed.

0x2A

[2:0]

FIELDNUM

Total Number of Fields. Set to 1 for single-field operation.

[27:3]

Unused

Set unused bits to 0.

0x2B

[4:0]

FIELD_SEL1

Selected First Field.

[9:5]

FIELD_SEL2

Selected Second Field.

[14:10]

FIELD_SEL3

Selected Third Field.

[19:15]

FIELD_SEL4

Selected Fourth Field.

[24:20]

FIELD_SEL5

Selected Fifth Field.

[27:25]

Unused

Set unused bits to 0.

0x2C

[4:0]

FIELD_SEL6

Selected Sixth Field.

[9:5]

FIELD_SEL7

Selected Seventh Field.

[27:10]

Unused

Set unused bits to 0.

0x2D

[27:0]

SCK

Unused

Set unused register to 0 if this register is accessed.

0x2E

[27:0]

SCK

Unused

Set unused register to 0 if this register is accessed.

0x2F

[27:0]

SCK

Unused

Set unused register to 0 if this register is accessed.

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