Pepper Computer RS232 User Manual

SMART I/O User’s Manual

©1996 PEP Modular Computers GmbH

March 12, 1996

Page 5 - 7

Chapter 5  Analog Modules

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.

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