AD9993BBCZ datasheet(26/57 Pages) AD

26 / 57 page

Data Sheet

AD9993

Rev. A | Page 25 of 56

START-UP REGISTER SEQUENCES

POWER-UP ROUTINE WHEN USING THE ON-CHIP

CLOCK SYNTHESIZER

To power up the device, set the register settings as described in

the following sections.

Chip Power-Up

SPI.Write(0x008, 0x00); power up all

blocks

DAC Setup

SPI.Write(0x03A, 0x02); DAC data format

offset binary

SPI.Write(0x03A, 0x00); DAC data format

twos complement

ADC Setup

SPI.Write(0x013, 0x00); enable ADC LVDS

output and offset binary

SPI.Write(0x013, 0x01); enable ADC LVDS

output and twos complement

SPI.Write(0x014, 0x01); set LVDS to 2 mA

(optional: 1 mA is default)

SPI.Write(0x0FF, 0x01); transfer

Synthesizer Setup (62.5 MHz Reference Clock Input)

SPI.Write(0x032, 0x01); SYNTH_CP_CAL_EN

SPI.Write(0x0FF, 0x01); transfer

SPI.Write(0x032, 0x11); start synthesizer

calibration

SPI.Write(0x0FF, 0x01); transfer

SPI.Read(0x02D); synthesizer status

0x01; calibration in progress

0x04; calibration done, synthesizer no

lock

0x06;calibration done, synthesizer locked

Sythesizer Setup (31.25 MHz Reference Clock Input)

SPI.Write(0x033, 0x20); CLKGEN_REFCLK_DIV1

SPI.Write(0x032, 0x01); synthesizer

CP_CAL_EN

SPI.Write(0x0FF, 0x01); transfer

SPI.Write(0x032, 0x11); start synth

calibration

SPI.Write(0x0FF, 0x01); transfer

SPI.Read(0x02D); synthesizer status

0x01; calibration in progress

0x04; calibration done, synthesizer no

lock

0x06; calibration done, synthesizer

locked

Synchronize LVDS Interface

SPI.Write(0x00A, 0x82); synchronize ADC

data with DCO clock, self cleared but

needs following SPI clock

SPI.Write(0x00A, 0x81); realign Tx FIFO

read and write pointers, self cleared but

need following SPI clock

SPI.Write(0x00A, 0x90); realign Rx FIFO

read and write pointers, DCI clock must be

present, self cleared but need following

SPI clock

Miscellaneous

Clear Interrupt

SPI.Write(0x0F0, 0xFF)

Enable Interrupt

SPI.Write(0x0F1, 0xFF)

SPI.Write(0x055, 0x01); ALERT_PULLUP_EN

(optional)

SPI.Write(0x0FF, 0x01); transfer

SPI.Write(0x039, 0x12); set DAC CML based

on compliance range of 0.7 V and on-chip

RFSADJ_x resistors

Set this bit if using DAC compliance range > 0.7 V.

SPI.Write(0x0ff, 0x001); data transfer

POWER-UP ROUTINE WHEN USING EXTERNAL

CLOCK

Chip Power-Up

SPI.Write(0x008, 0x00); power up all

blocks

DAC Setup

SPI.Write(0x03A, 0x02); DAC data format

offset binary

SPI.Write(0x03A, 0x00); DAC data format

twos complement

ADC Setup

SPI.Write(0x013, 0x00); enable ADC LVDS

output and offset binary

SPI.Write(0x013, 0x01); enable ADC LVDS

output and twos complement

SPI.Write(0x014, 0x01); set LVDS to 2 mA

(optional: 1 mA is default)

SPI.Write(0x0FF, 0x01); transfer

External Clock Setup

SPI.Write(0x034, 0x07); set external clock

mode

SPI.Write(0x0FF, 0x01); transfer

AD9993BBCZ датащи(PDF) 26 Page - Analog Devices

AD9993BBCZ датащи(HTML) 26 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 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57

датащи скачать

ссылки URL