AD9643 datasheet(34/36 Pages) AD

34 / 36 page

AD9643

Rev. A | Page 34 of 36

Addr

(Hex)

Name

Bit 7

(MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

(LSB)

Default

Value

(Hex)

Default

Notes/

Comments

0x1F

User Test

Pattern 4 LSB

(global)

User Test Pattern 4[7:0]

0x00

0x20

User Test

Pattern 4 MSB

(global)

User Test Pattern 4[15:8]

0x00

0x24

BIST signature

LSB (local)

BIST signature[7:0]

0x00

Read only.

0x25

BIST signature

MSB (local)

BIST signature[15:8]

0x00

Read only.

0x3A

Sync control

(global)

Open

Clock

divider

next sync

only

Clock

divider

sync

enable

Master sync

buffer enable

0x00

0x59

SYNC pin

control

(local)

Open

SYNC pin

sensitivity

0 = sync

on high

level

1 = sync

on edge

SYNC pin

edge

sensitivity

0 = sync on

falling edge

1 = sync on

rising edge

0x00

1 The channel index register at Address 0x05 should be set to 0x03 (default) when writing to Address 0x00.

MEMORY MAP REGISTER DESCRIPTION

For more information on functions controlled in Register 0x00

to Register 0x25, see the AN-877 Application Note, Interfacing

to High Speed ADCs via SPI.

Sync Control (Register 0x3A)

Bits[7:3]—Reserved

Bit 2—Clock Divider Next Sync Only

If the master sync buffer enable bit (Address 0x3A, Bit 0) and

the clock divider sync enable bit (Address 0x3A, Bit 1) are high,

Bit 2 allows the clock divider to sync to the first sync pulse that

it receives and to ignore the rest. The clock divider sync enable

bit (Address 0x3A, Bit 1) resets after it syncs.

Bit 1—Clock Divider Sync Enable

Bit 1 gates the sync pulse to the clock divider. The sync signal is

enabled when Bit 1 is high and Bit 0 is high. This is continuous

sync mode.

Bit 0—Master Sync Buffer Enable

Bit 0 must be set high to enable any of the sync functions. If the

sync capability is not used, this bit should remain low to

conserve power.

SYNC Pin Control (Register 0x59)

Bits [7:2]—Reserved

Bit 1—SYNC Pin Sensitivity

If Bit 1 is set to 0, the SYNC input responds to a level. If this bit

is set low, the SYNC input responds to the edge (rising or

falling) set in Bit 0 of Address 0x59.

Bit 0—SYNC Pin Edge Sensitivity

If Bit 1 is set high, setting Bit 0 to a 0 causes the SYNC input to

respond to a falling edge. If this bit is set, the SYNC input

respond to a rising edge.

AD9643 Datasheet(PDF) 34 Page - Analog Devices

AD9643 Datasheet(HTML) 34 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

Datasheet Download

Link URL