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Revision: December 6, 2004 246 East Main | Pullman, WA 99163

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Functional Description

The AIO1 board is a peripheral board designed to work with Digilent’s family of system boards. The

AIO1 contains analog-to-digital and digital-to-analog converters from Analog Devices, two dual op-

amps, a variety of analog signal I/O connectors, and a solderless breadboard. All analog components

use an on-board 5VDC voltage source. All unused I/O signals are passed through the AIO1 board so

that it can be used between a system board and other peripheral boards.

The solderless breadboard and op-

amps on the AIO1 can be used to

construct filters and amplifiers for the

data converters. Gain and frequency-

limiting resistor/capacitor networks can

be constructed on the breadboard,

and connected to the op-amps and

data converters using jumper wires

inserted into the breadboard

connector. The breadboard connector

can also be used to route analog I/O

signals to any one of eight connectors

included on the board (including BNC,

RCA, and 1/8 audio jacks).

The AIO1 uses an 8-bit, 200Ks

analog-to-digital converter (the

AD7823), and an 8-bit, 1Mhz digital-to-

analog converter (the AD7303), both

from Analog Devices. The AD8534 op-

amps (also from Analog Devices) can

drive 250mA outputs rail-to-rail with a

3Mhz bandwidth, so many useful

devices can be driven directly.

The IO1 board uses only twelve signals, all from the J2 connector. Of these, six are provided as

uncommitted digital I/Os (three inputs and three outputs), and six are used by the data converters.

Both data converters use a serial protocol with data signal, clock, and synchronizing signals. Only one

signal is returned to the system board, and it uses a 3.3V buffer so that lower-voltage system boards

can be used.

The J2 connector pin definitions are shown below (all J2 signals not shown pass through to J4).

The AOI1 has two voltage selections available. It can be operated with VCC 3.3V (for the Digilent

Pegasus Board) or 5Vv for all other Digilent System Boards. To use either voltage selection, place a

jumper on JP2 as outlined by the silkscreen on the AIO1.

Connector J2

A2D

Converter

(AD 7823)

D2A

Converter

(AD 7303)

74CH125

buffer

Solderless

Breadboard

Breadboard connector

Various I/O

connectors

OUT

6 5

Serial

data

Op amps

All nodes

Data and control

Digital I/O

J1 signals pass through to J3;

unused J2 signals pass through to J4

Connector J1

Connector J3

Figure 1: AIO1 block Diagram

1 2

Inhaltsverzeichnis

Seite 1 - Figure 1: AIO1 block Diagram

DDiiggiilleenntt AAIIOO11 MMaannuuaall www.digilentinc.com™ Revision: December 6, 2004 246 East Main | Pullman, WA 99163 (509) 334 6306 Voice and

Seite 2

AIO1 Reference Manual Digilent, Inc. ™ www.digilentinc.com Page 2 J2 connector pin definitions J2 pin AIO signal Description 30 DACIN AD7

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Digilent AIO1 Bedienungsanleitung

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