AD8284WCSVZ datasheet(23/28 Pages) AD

23 / 28 page

Data Sheet

AD8284

Rev. D | Page 23 of 28

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

0x1B

FLEX_USER_PATT2_LSB B7

0x00

User defined

Pattern 2, LSB.

0x1C

FLEX_USER_PATT2_

MSB

B15

B14

B13

B12

B11

B10

0x00

User defined

Pattern 2, MSB.

0x2B

FLEX_FILTER

Enable

automatic

low-pass

tuning

1 = on

(self

clearing)

0x00

Enables low-

pass filter

tuning

0x2C

CH_IN_IMP

Saturation detector limit adjust

000 = 1.90 V p-p at PGA output

011 = 2.00 V p-p at PGA output

(default)

111 = 2.15 V p-p at PGA output

Other values reserved (001, 010,

100, 101, 110)

Satura-

tion

detect

hysteresis

0 = low

hysteresis

(25 mV

nominal at

PGA

output)

(default)

1 = high

hysteresis

(nominally

60 mV at

PGA

output)

Input

imped-

ance

0 = 200 Ω

1 =

200 kΩ

(default)

0x61

Saturation

detector

adjustment

and input

impedance

adjustment

(global).

X = undefined feature.

Table 11. Flexible Output Test Modes1

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

Checkerboard output

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-bit/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

N/A means not applicable.

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