Converters.TV 535 Manuel d'utilisateur télécharger pdf

Engineer-to-Engineer Note EE-245

Technical notes on using Analog Devices DSPs, processors and development tools

Contact our technical support at dsp.suppor[email protected] and at dspt[email protected]

Or visit our on-line resources http://www.analog.com/ee-notes and http://www.analog.com/processors

Interfacing AD7276 High-Speed Data Converters to ADSP-BF535

Blackfin® Processors

Contributed by Aseem Vasudev Prabhugaonkar Rev 1 – October 4, 2004

customers’ products or for any infringements of patents or rights of others which may result from Analog Devices assistance. All trademarks and logos are property

of their respective holders. Information furnished by Analog Devices applications and development tools engineers is believed to be accurate and reliable, however

no responsibility is assumed by Analog Devices regarding technical accuracy and topicality of the content provided in Analog Devices’ Engineer-to-Engineer Notes.

Introduction

This application note explains how to interface

AD7276 high-speed data converters to

Blackfin® processors. This application note also

provides example code to demonstrate how the

Blackfin processor's serial ports (SPI and

SPORTs) can be programmed to receive data

from AD7276 devices in core and DMA modes.

The power-down scheme for AD7276 ADCs

between conversions in DMA mode is also

described. The interface is achieved using an

ADSP-BF535 EZ-KIT Lite™ board.

About AD7276/7277/7278 ADCs

The AD7276/AD7277/AD7278 devices are 12-,

10-, and 8-bit, high-speed, low-power,

successive-approximation ADCs, respectively.

The parts operate from a single 2.35 V to 3.6 V

power supply and feature throughput rates up to

3 million samples per second (MSPS).

The conversion process and data acquisition are

controlled using the

/CS signal and the serial

clock, allowing the devices to interface with

variety of microprocessors or DSPs. The input

signal is sampled on the falling edge of /CS, and

the conversion is also initiated at this point.

There are no pipeline delays associated with the

part.

The AD7276/AD7277/AD7278 ADCs use

advanced design techniques to achieve very low

power dissipation at high throughput rates.

The reference for the part is taken internally from

VDD. This allows the widest dynamic input

range to the ADC. Thus, the analog input range

for the part is from 0 V to VDD. The conversion

rate is determined by the serial clock SCLK.

AD7276/7277/7278 Product Highlights

 3 MSPS ADCs in a 6-lead TSOT package

 Pin compatible to AD7476/7477/7478 and

AD7476A/7477A/7478A parts

 High throughput with low power

consumption

 Flexible power / serial clock speed

management

The conversion rate is determined by the

serial clock. Increasing the serial clock speed

reduces the conversion time. This reduces

average power consumption while in power-

down mode (i.e., while not converting). The

part also features a power-down mode to

maximize power efficiency at lower

throughput rates. Current consumption is 1

µA max in power-down mode.

 Reference derived from the power supply

 No pipeline delay

The parts feature a standard successive

approximation ADC with accurate control of

the sampling instant via a /CS input and once-

off conversion control.

1 2 3 4 5 6

Résumé du contenu

Page 1 - Blackfin® Processors

Engineer-to-Engineer Note EE-245 a Technical notes on using Analog Devices DSPs, processors and development toolsContact our technical support at d

Page 2 - About ADSP-BF535 Processors

a Interfacing AD7276 High-Speed Data Converters to ADSP-BF535 Blackfin® Processors (EE-245) Page 2 of 6 AD7276/7277/7278 A/D Applications AD7276/7

Page 3 - SPI Interface Details

a Interfacing AD7276 High-Speed Data Converters to ADSP-BF535 Blackfin® Processors (EE-245) Page 3 of 6 Figure 1. AD7276 Serial Interface Timing

Page 4 - AD7276 Power-Down Mode

a Interfacing AD7276 High-Speed Data Converters to ADSP-BF535 Blackfin® Processors (EE-245) Page 4 of 6 Figure 3. CPHASE=0, CPOL=1 in Core Mode.

Page 5 - SPORT Interface Details

a Interfacing AD7276 High-Speed Data Converters to ADSP-BF535 Blackfin® Processors (EE-245) Page 5 of 6 SPORT Interface Details The ADSP-BF535 pro

Page 6 - Document History

a Interfacing AD7276 High-Speed Data Converters to ADSP-BF535 Blackfin® Processors (EE-245) Page 6 of 6 Summary As seen in this application note,

Plus de documents pour Enregistreurs vidéo numériques (DVR) Converters.TV 535

Voir le document Converters.TV 535 Manuel d'instructions

Converters.TV 535 Manuel d'instructions (22 pages)

Voir le document Converters.TV 535 Guide de l'utilisateur

Converters.TV 535 Guide de l'utilisateur (44 pages)

Voir le document Converters.TV 535 Manuel d'utilisateur

Converters.TV 535 Manuel d'utilisateur (4 pages)

Commentaires sur ces manuels

Pas de commentaire

Converters.TV 535 Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Enregistreurs vidéo numériques (DVR) Converters.TV 535. Interfacing AD7276 High-Speed Data Converters to ADSP Manuel d'utilisatio

Résumé du contenu

Plus de documents pour Enregistreurs vidéo numériques (DVR) Converters.TV 535

Commentaires sur ces manuels

Produits connexes et manuels pour Enregistreurs vidéo numériques (DVR) Converters.TV 535