Pepper Computer RS232, RS485 user manual Analog Modules, SM-DAD1

Chapter 5 Analog Modules SMART I/O User’s Manual

5. Analog Modules

5.1SM-DAD1

5.1.1Introduction

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

Output

EEPROM

Front Panel

Power Cons.

Temperature Range

Temperature Drift

Module Weight

ID Byte

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

13∝s Conversion Time @ 1MHz SCLK

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 40∝s (-10V to +10V)

256-byte serial EEPROM for Calibration Data Red LEDs (user configurable)

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

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

6 LSB (max.) across temp. range -40°C to +85°C (ADC) 4 LSB (max.) across temp. range -40°C to +85°C (DAC) 70g

$50, read by the SPI Interface

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March 12, 1996 ©1996 PEP Modular Computers GmbH Page 5 - 7