Pepper Computer Modular Computers RS485 - Manual (Page 163)

SMART I/O User’s Manual
©1996 PEP Modular Computers GmbH March 12, 1996 Page 5 - 7
5
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 k
Ω
Filter set to 10kHz
On-chip Reference Voltage
13
µ
s 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 40
µ
s (-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