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SMART I/O User’s Manual
©1996 PEP Modular Computers GmbHOctober 01, 1996 Page 5 - 89
5
Chapter 5 Analog Modules
5.4 SM-ADC1
5.4.1 Introduction
The SM-ADC1 provides a fast, 12-bit, bipolar (± 10V DC), 6-channel
analog to digital converter. Two configurable red LEDs on the front panel
form the user interface while an on-board EEPROM stores unique calibra-
tion data required by the signal converter.
A version of the SM-ADC1 for current input (0 .. 20mA) is also available.
5.4.2 Specifications
† The conversion time applies per channel
Isolation 1.0 kV Optoisolated from the system
Input
6 Differential Inputs
Input Range ± 10V (0 .. 20mA)
12-bit ADC with 1-bit non-linearity
10-bit Repeating Accuracy
Overvoltage Protection ± 35V
Input Impedance approx. 440kΩ (124Ω )
10kHz Filter
On-Chip Ref. Voltage
13µs Conversion Time @ 1MHz SCLK †
EEPROM 256 Byte serial EEPROM for Calibration Data
Front Panel 2 Red LEDs (User Configurable)
Power Cons. 350mW (min.), 450mW (max.)
Temperature Range Standard (0°C to +70°C), Ext./Storage (-40°C to +85°C)
Module Weight 70g
ID Byte $62, read by the SPI Interface