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SMART I/O User’s Manual

Chapter 5 Analog Modules

5. Analog Modules

5.1 SM-DAD1

5.1.1 Introduction

The SM-DAD1 provides a fast, 12-bit, bipolar (± 10V DC), 4-channel

analog to digital converter and, apart from its ADC role, may also be used as

a fast 12-bit, 2-channel unipolar/bipolar digital to analog converter. Two

configurable red LEDs on the front panel form the user interface while an

on-board EEPROM stores unique calibration data (obtained in steady-state

conditions at 25°C STP) required by the signal converters.

5.1.2 Specifications

Input

4 Differential Voltage Inputs

Input Range ± 10V

12-bit ADC with 1-bit non-linearity

10-bit repeating accuracy

Overvoltage Protection (± 35V)

Input Impedance approx. 450 kΩ

Filter set to 10kHz

On-chip Reference Voltage

13µs Conversion Time @ 1MHz SCLK

Output

2 Unipolar / Bipolar Outputs

Short-Circuit Protected

12-bit DAC with 1-bit non-linearity

Output Range ± 10V or 0..10V

5mA max. Output Current

Power-up Reset without glitch (Unipolar)

4mV Zero Code Offset Error (Unipolar)

Settling Time 40µs (-10V to +10V)

EEPROM 256-byte serial EEPROM for Calibration Data

Front Panel Red LEDs (user configurable)

Power Cons. 350mW (min.), 450mW (max.)

Temperature Range Standard (0°C to 70°C), Extended (-40°C to +85°C)

Temperature Drift

6 LSB (max.) across temp. range -40°C to +85°C (ADC)

4 LSB (max.) across temp. range -40°C to +85°C (DAC)

Module Weight 70g

ID Byte $50, read by the SPI Interface

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Pepper-computer Modular Computers RS485 Bedienungsanleitung Seite 163