ADA8282 datasheet(24/27 Pages) AD

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AD8283

Data Sheet

Rev. C | Page 24 of 27

Addr.

(Hex)

Bit 7

(MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

(LSB)

Default

Value

Default Notes/

Comments

FLEX_VREF

0 =

internal

reference

1 =

external

reference

00 = 0.625 V

01 = 0.750 V

10 = 0.875 V

11 = 1.024 V

(default)

0x03

Select internal

reference

(recommended

default) or ex-

ternal reference

(global); adjust

internal refer-

ence.

FLEX_USER_PATT1_LSB

0x00

User-defined

pattern, 1 LSB.

FLEX_USER_PATT1_

MSB

B15

B14

B13

B12

B11

B10

0x00

User-defined

pattern, 1 MSB.

FLEX_USER_PATT2_LSB

0x00

User-defined

pattern, 2 LSBs.

FLEX_USER_PATT2_

MSB

B15

B14

B13

B12

B11

B10

0x00

User-defined

pattern, 2

MSBs.

FLEX_FILTER

Enable

automatic

low-pass

tuning

1 = on

(self-

clearing)

0x00

CH_IN_IMP

0 =

200Ω

(default)

1 =

200kΩ

0x00

Input imped-

ance adjust-

ment (global).

Table 10. Flexible Output Test Modes

Output Test Mode

Bit Sequence

Pattern Name

Digital Output Word 1

Digital Output Word 2

Subject to Data

Format Select

0000

Off (default)

N/A

0001

Midscale short

1000 0000 0000

Same

Yes

0010

+Full-scale short

1111 1111 1111

Same

Yes

0011

−Full-scale short

0000 0000 0000

Same

Yes

0100

Checkerboardoutput

1010 1010 1010

0101 0101 0101

0101

PN sequence long

N/A

Yes

0110

PN sequence short

N/A

Yes

0111

One-/zero-word toggle

1111 1111 1111

0000 0000 0000

1000

User input

1001

1-/0-bit toggle

1010 1010 1010

N/A

1010

1× sync

0000 0011 1111

N/A

1011

One bit high

1000 0000 0000

N/A

1100

Mixed bit frequency

1010 0011 0011

N/A

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