AD9670EBZ datasheet(47/48 Pages) AD

47 / 48 page

AD9674

Data Sheet

Rev. A | Page 46 of 47

Addr.

(Hex) RegisterName

Bit 7 (MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0 (LSB)

Default

Value Comments

0x198 CLOCK_DOUBLING 0

DCO frequency doubling/divider:

0000 = 1 (default),

0001 = 2,

0010 = 4,

0011 = 8,

0100 = 16,

0101 = 32,

0110 = 64,

0111 = 128,

1000 = 1/256,

1001 = 1/128,

1010 = 1/64,

1011 = 1/32,

1100 = 1/16,

1101 = 1/8,

1110 = 1/4,

1111 = 1/2

0x00

DCO frequency control

(global).

0x199 SAMPLE_CLOCK_

COUNTER

Enables clocks per

sample auto

calculation:

0 = off (default),

1 = on

0x00

Enables FCO function

(global).

0x19A DATA_OUTPUT_

INVERT

Inverts data

output:

0 =

noninverted

(default),

1 = inverted

0x00

Inverts DOUT signal

outputs (global).

0x19B SERIAL_FORMAT

Enables FCO

for start code

sample:

0=disable,

1=enable

(default)

Enables

FCO for

extra

sample at

end of

burst:

0=disable,

1 = enable

(default)

EnablesFCO

continuously:

0 = only

during

burst, 1 =

continuous

(default)

FCO signal rotate:

0000 = FCO signal aligned with DOUT signal,

0001 = FCO 1 bit before DOUT,

0010 = FCO 2 bits before DOUT,

…,

1101 = FCO 3 bits after DOUT,

1110 = FCO 2 bits after DOUT,

1111 = FCO 1 bit after DOUT

0x70

FCO signal controls

(global).

0x19C RESERVED_19C

0x10

Reserved.

0x19D RESERVED_19D

0x00

Reserved.

0x19E RESERVED_19E

0x10

Reserved.

0x19F RESERVED_19F

0x00

Reserved.

0x1A0 RESERVED_1A0

0x00

Reserved.

0x1A1 RESERVED_1A1

0x00

Reserved.

ProfileMemoryRegisters

0xF00

0xFFF

Profile memory

32 × 64 bits

0x00

Vector profile memory

(global).

MEMORY MAP REGISTER DESCRIPTIONS

For more information about the SPI memory map and other

functions, consult the AN-877 Application Note, Interfacing

to High Speed ADCs via SPI.

Transfer (Register 0x0FF)

All registers except Register 0x002 update as soon as they are

written. Writing to Register 0x0FF (the value written is don’t

care) initializes and updates the speed mode (Address 0x002)

and resets all other registers to their default values (analog and

ADC registers only, and not JESD204B registers, Register 0x000

or Register 0x002).

Set the speed mode in Register 0x002 and write to Register 0x0FF

at the beginning of the setup of the SPI writes after the device is

powered up to avoid rewriting other registers after Register 0x0FF

is written.

Profile Index and Manual TX_TRIG (Register 0x10C)

The vector profile is selected using the profile index in

generates a TX_TRIG signal internal to the device. This signal

is asynchronous to the ADC sample clock. Therefore, it cannot

be used to align the data output or initiate advanced power mode

across multiple devices in the system. The external pin driven

TX_TRIG± control is recommended for systems that require

synchronization of these features across multiple AD9674 devices.

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