Multibus-International

Model: ST-732

Manufactured by: Datel

ST-732 Analog Input/Output Board - 16 differential or 32 single-ended analog input channels. 4-20 mA current loop input configuration possible.  Two 12-bit non-isolated hybrid D/A converters.  Each configurable for +5V, +10V, ±5V, ±10V or 4-20 mA current loop outputs.

Full mechanical, electrical and pinout compatibility to Intel's SBC-732

Analog Input Boards and Datel's ST-732RLY Board

Operates with all Multibus and SBC Series compatible microcomputers including the 16 bit SBC-86/12 (except SBC80/04).

Works directly from Intel's RMX-80 Analog I/O Driver operating software.

Includes 10-stage, jumper selected, program-gatable Pacer start clock, 1 mS to 1 sec., crystal controlled

Analog inputs accept up to 16 user-installed shunts for 4-20 mA etc. current inputs.

FET-input differential amplifier accepts on-board resistor for high gain up to X1000 (10 mV full scale range)

Includes programmable Gain Amplifier (X1, 2, 4, 8 gains)

Includes selectable memory base address (16 reserved addresses).

Includes End-of-Conversion, End-of-Scan and External Start Trigger interrupts

Includes start and final channel address storage registers and automatic address incrementing.

12 bit binary conversion; 23,000 samples per second.

The A/D section on the ST-732 uses Datel’s hybrid technology ADC-HS12B combined successive approximation A/D converter and sample/hold amplifier.  The ADC-HS leatures 6 uses S/H acquisition time and B uses A/D conversion time and 12 bit binary resolution (1 part in 4096).  System accuracy varies from =0.05% of FSR =1/2 LSB (10 volt range) to =0.3% FSR =1/2 LSB (10 mV range), including noise, quantization, nonlinearity and dynamic errors.  The ST-732 employs Datel's MX-1606 series fast CMOS multiplexers which incorporate =35V over voltage protection.  Input impedance is 100 megohms minimum (power on) with 30 pA typical input bias current.  Balanced inputs require 5 kilohms maximum source impedance to maintain accuracy and throughput rate.

All models include an FET input differential amplifier which is wired as single-ended for the 32 channel models.  This diff. Amp. will accept a fixed resistor to increase the gain to 1000, making 10 millivolts full scale ranges practical.  For differential inputs, the common mode voltage is =12V to analog common. Common mode noise rejection varies from 120dB at dc with a gain of 8 to 60 dB at 60 Hz with a gain of 1000 Sample/Hold aperture delay time is 100 nanoseconds, maximum.

System temperature coefficients are =25 ppm of FSA/oC (gain drift of gain *1) and =20uV/oC (RT1) zero drift.  Amplifier setting time is 6 microseconds (high level) and typically 110 microseconds (low level). Overall system throughout rate for high level signals is 23,000 samples per second.

The standard A/D- D/A digital coding is off-set binary (bipolar) but jumpers may easily be changed to straight binary (unipolar) or 2’s complement (bipolar).  Standard A/D-D/A analog signal ranges are =10V full scale but may be jumper selected to =5V, or +5V or + 10V unipolar.

D/A outputs include op amps for voltage outputs, giving very low output impedance (2/10’s of an ohm) at mA short circuit proof output current.  D/A setting time is 4 uS(ES pk-pk change).   Output temperature drift is a 50 ppm lo FSR/oC 4 to 20 mA current loop outputs accept a 15 to 30 Vdc voltage compliance with =0.075% FSR accuracy and =50 ppm FSR/oC drift.

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