Pepper Computer Modular Computers RS485 - Manual (Page 245)

SMART I/O User’s Manual
©1996 PEP Modular Computers GmbH October 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. 440k
Ω
(124
Ω
)
10kHz Filter
On-Chip Ref. Voltage
13
µ
s 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