General Description

DMM-32X-AT is a PC/104-format data acquisition board with a full set of analog and digital I/O features. It offers 32 analog inputs with 16-bit resolution and programmable input range; 250,000 samples per second maximum sampling rate with FIFO operation; 4 analog outputs with 12-bit resolution; user-adjustable analog output ranges; 31 lines of digital I/O; one 32-bit counter/timer for A/D conversion and interrupt timing; and one 16-bit counter/timer for general purpose use. The DMM-32X-AT is designed to be a fully backwards-compatible upgrade for the DMM-32-AT board. In addition to all DMM-32-AT features, the DMM-32X-AT includes the following upgrades:

• 1024-sample FIFO for A/D samples vs. 512 samples on DMM-32-AT                                                                                                      
• 1024-sample data buffer for D/A waveform generation                                                                                                                         
• Software reprogrammable FPGA and dsPIC microcontroller for future feature enhancements                                                                  
• Ability to issue commands to DMM-32X-AT through a serial port                                                                                                            
• Patented auto-autocalibration feature that provides fully autonomous calibration in hardware                                                                   
  
  
  

Links

Datasheet

User's Manual

Diamond Systems Home Page

Linux Driver Version 5.9.2

Features

Analog Inputs

• 32 input channels, 16-bit resolution  
• May be configured as 32 single-ended, 16 differential, or 16 SE + 8 DI  
• Programmable gain, range, and polarity on inputs  
• 250,000 samples per second maximum sampling rate  
• 1024-sample FIFO for reduced interrupt overhead  
• Autocalibration of all input ranges under software control  
• Patented hardware-implemented auto-autocalibration

Analog Outputs

• 4 analog output channels with 12-bit resolution, 5mA max output current  
• Multiple fixed full-scale output ranges, including unipolar and bipolar ranges  
• Programmable full-scale range  
• Patented hardware-implemented auto-autocalibration  
• 1024-sample FIFO for D/A wave form generation

Digital I/O

• 24 bi-directional lines using integrated 8255-type circuit  
• Buffered I/O for enhanced current drive  
• Handshaking controls enable external latching of data as well as interrupt operation  
• User-configurable pull-up / pull-down resistors  
• 7 additional I/O lines are fixed direction with programmable functions

Counter/Timers and A/D Triggering

• 1 32-bit counter/timer for A/D pacer clock and interrupt operation timing  
• 1 16-bit general purpose counter/timer  
• Programmable input sources for each counter/timer  
• External A/D triggering and gating inputs  
• Multiple-board synchronization capability using A/D convert pulse out and external trigger in  
• Interrupts may be generated by counter/timer

Miscellaneous

• Extended temperature -40 to +85oC operation  
• No trimpots or user adjustments required for calibration.
• Auto autocalibration will automatically adjust The A/D without user input.
• Calibration time for all modes is approximately 2 seconds.  
• Auto autocalibration of one A/D mode using the onboard dsPIC requires approx 0.5 seconds.
  
  
  

Specifications

Analog Inputs

• No. of inputs 32 single-ended, 16 differential, or 16 SE and 8 DI
• A/D resolution 16 bits (1/65536 of full scale)
• Input ranges
  • Bipolar: ±10V, ±5V, ±2.5V, ±1.25V, ±0.625V
  • Unipolar: 0 - 10V, 0 - 5V, 0 - 2.5V, 0 - 1.25V
• Input bias current 100pA max
• Maximum input voltage ±10V for linear operation
• Overvoltage protection ±35V on any analog input without damage
• Nonlinearity ±3LSB, no missing codes
• Conversion rate 250,000 samples per second max, single channel
• Conversion trigger software command, internal pacer clock, or external TTL signal

Analog Outputs

• No. of outputs 4
• D/A resolution 12 bits (1/4096 of full scale)
• Full-scale output ranges
  • Fixed Unipolar: 0 - 5V or 0 - 10V
  • Fixed Bipolar: ±5V or ±10V
  • Programmable: 0 - 10V or ±10V in .01V steps
• Output current ±5mA max per channel
• Settling time 6uS max to ±1/2 LSB
• Relative accuracy ±1 LSB
• No linearity ±1 LSB, monotonic
• Output reference +5V ±.005V

Autocalibration

• Circuits calibrated A/D (all 9 input ranges) and D/A
• A/D error after calibration ±2LSB
• D/A error after calibration ±1LSB

Digital I/O

• No. of lines 24 using 8255-type circuit
• Handshaking Latch input, acknowledge output available in 8255 mode 1 configuration
• Input voltage Logic 0: 0.0V min, 0.8V max; Logic 1: 2.0V min, 5.0V max
• Input current ±1µA max
• Output voltage Logic 0: 0.0V min, 0.33V max; Logic 1: 2.4V min (at 15mA load), 5.0V max
• Output current +64/-15mA max per line
• Auxiliary DIO 4 inputs, 3 outputs, TTL compatible

Counter/Timers and Interrupts

• A/D Pacer clock 32-bit down counter (2 82C54 counters cascaded)
• Clock sources
  • 10MHz on-board clock oscillator
  • 100KHz derived frequency
  • External signal
• General purpose 16-bit down counter (1 82C54 counter)
• Clock sources
  • 10MHz on-board clock oscillator
  • 10KHz derived frequency
  • External signal
• Interrupt triggers
  • End of A/D conversion
  • Latch input on digital I/O header
  • Timer 0 output

General

• Power supply +5VDC ±10%
• Current consumption 410mA typical
• Operating temperature -40 to +85C
• Operating humidity 5% to 95% noncondensing
• PC/104 bus 16 bits; compatible with 8-bit bus systems
• Weight 3.4oz / 96g 
  
  
  
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Connector Locations

• J1    PC/104 8-bit bus header
• J2    PC/104 16-bit bus header (only used for interrupt level)
• J3    Analog I/O header (includes trigger and ctr/timer signals)
• J4    Digital I/O header
• J5    Analog input single-ended / differential configuration
• J6    D/A unipolar / bipolar / full-scale range configuration
• J7    Base address / DMA level / interrupt level / bus width
• J8    Digital I/O pull-up / pull-down configuration
• J9    Test connector; not used in normal operation
• J10   JTAG programming cable; not used in normal operation
• J11   Auxiliary power / serial connector
• LED  User-programmable LED

FOCE Signal Assignments

Analog Inputs (8 Differential & 16 Single Ended at 16 Bit Resolution)

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