 Description
The DMM-16R-AT features top performance and flexibility for a mid-range price. It has 16 single-ended / 8 differential analog voltage inputs with both unipolar and bipolar input ranges, programmable gain, and a maximum sampling rate of 100KHz. The 4 D/A channels and 16 digital I/O lines provide additional real-world control and monitoring capability. The full -40°to +85°C industrial temperature operation ensures reliable and accurate performance in any embedded system application. A fully-featured software library with example programs and a graphical user interface completes the solution to make the DMM-16R-AT a solid choice for PC/104 embedded systems requiring analog I/O.
Features
- 16 analog inputs, 16-bit resolution
- 100KHz max sampling rate
- Programmable gain and range
- FIFO support and interrupt-based A/D data transfer with Full flag and Underflow flag for better monitoring
- 4 12-bit analog outputs
- 16 digital I/O lines with choice of 8 in + 8 out, 16 out, or 16 in
- 5V/3.3V logic level operation
- Rugged -40°C to +85°C operation
- Drop-in upgrade for Diamond MM-16-AT
Block Diagram
Analog Inputs
The 16 16-bit analog input channels feature programmable gains of 1, 2, 4, and 8, as well as programmable unipolar/bipolar range, for a total of 7 different input ranges. Maximum sampling rate is 100KHz (total for all channels). Both single-channel and multi-channel scan sampling modes are supported. A 512-sample FIFO combined with interrupt data transfers enables the board to operate reliably at full speed in any operating system and reduce the overall load on the processor, by reducing the overall interrupt rate and eliminating the need to handle individual read operations for each sample. The A/D can be triggered with a software command, the on-board programmable timer, or an external signal. These features give you maximum flexibility to configure the board to your application.
Analog Outputs
The board also has 4 12-bit analog voltage outputs with multiple unipolar and bipolar output ranges. The DACs support individual and simultaneous update capability. A programmable output range feature lets you set the output range via software anywhere between 0V and 10V with 1mV precision in both unipolar and bipolar modes. For higher volume applications, the D/A chip can be removed for cost reduction.
Autocalibration for Highest Accuracy
Both analog inputs and outputs benefit from our unique multi-range autocalibration process. Multiple on-board precision references with high temperature stability are used to calibrate each analog input range individually, thereby ensuring the highest degree of accuracy over the life of the product. The analog outputs are also fed back to the autocalibration circuit for precise output range calibration.
Digital I/O Features
DMM-16R-AT digital features include a 32-bit counter/timer to provide A/D sampling control and a 16-bit counter/timer for general purpose counting and rate generator functions. The board also provides 16 programmable digital I/O lines grouped into two 8-bit ports, each of which can be programmed for either input or output. The digital I/O lines feature jumper-selectable 3.3V / 5V logic levels and 10K pull-up / pull-down resistors.
Backwards Compatibility
DMM-16R-AT is fully compatible with the original DMM-16-AT analog I/O module and can serve as a drop-in replacement offering reduced cost and enhanced digital I/O features. The mechanical design, connector type and pinout, and software interface are all identical the original board, eliminating any mechanical or software engineering efforts. Our migration guide explains the differences to enable customers to switch to the new model to achieve these benefits and extend product lifetimes.
Software Support
DMM-16R-AT is supported by our Universal Driver software for Windows and Linux. Universal Driver features a library of functions for C-language software development that simplifies all I/O operations, including administrative functions such as calibration. Example programs are provided in both source code and executable format for demonstration and immediate usability. Our unique Control Panel program provides a graphical user interface for both Windows and Linux that can control all the board’s features in real time. It can be used for proof of concept, prototyping, and diagnostics. Universal Driver may be ported to other operations systems by customer request.
Specifications
| Analog Inputs |
| Number of inputs |
8 differential or 16 single-ended (user selectable) |
| A/D resolution |
16 bits (1/65,536 of full scale) |
| Bipolar ranges |
±10V, ±5V, ±2.5V, ±1.25V, ±0.625V |
| Unipolar ranges |
0-10V, 0-5V, 0-2.5V, 0-1.25V |
| Input bias current |
3nA max |
| Overvoltage protection |
±35V on any analog input without damage |
| Input Impedance |
10^13 ohms |
| Nonlinearity |
±3LSB, no missing codes |
| Conversion rate |
100,000 samples/sec. max with interrupts |
| Conversion trigger |
Software trigger, internal pacer clock, or external TTL signal |
| Input FIFO |
512 samples,256-sample interupt threshold |
| A/D interrupt |
End of A/D conversion
End of A/D scan
FIFO half-full |
| Calibration |
A/D and D/A circuits calibrated under software control using on-board precision references and EEPROM storage |
| Analog Outputs |
| Number of outputs |
4 |
| D/A resolution |
12 bits (1/4096 of full scale) |
| Output ranges |
Fixed: ±5, 0-5V
Programmable: Anywhere between 0V and 10V in 1mV increments
Reset: All channels reset to mid-scale (0V for bipolar ranges) |
| Output current |
±5mA max per channel |
| Settling time |
6µS max to 0.01% |
| Relative accuracy |
±1 LSB |
| Nonlinearity |
±1 LSB, monotonic |
| Digital I/O |
| Number of lines |
16, organized as 2 8-bit ports |
| Logic Levels |
3.3V / 5V jumper selectable |
| Termination |
10K ohm pull-up / pull-down resistors, jumper selectable |
| Input voltage |
Vlogic = 5V |
| Logic 0 |
1.65V max |
| Logic 1 |
3.35V min |
| Output voltage |
Vlogic = 5V |
| Logic 0 |
0.44V max, Iout = 24mA |
| Logic 1 |
3.76V min, Iout = -24mA |
| Input voltage |
Vlogic = 3.3V |
| Logic 0 |
0.80V max |
| Logic 1 |
2.00V min |
| Output voltage |
Vlogic = 3.3V |
| Logic 0 |
0.44V max, Iout = 24mA |
| Logic 1 |
2.25V min, Iout = -24mA |
| Counter/Timers |
| A/D Timer clock |
32-bit down counter |
| General purpose |
16-bit down counter |
| Clock source |
10MHz on-board clock or external signal |
| General |
| Bus Interface |
ISA (5V) bus |
| Power supply |
+5V ±5% @ 390mA typical |
| Operating temperature |
-40°C to +85°C tested and guaranteed |
| Weight |
64g / 2.25oz |
| RoHS |
Compliant |
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PC/104 16-Bit Analog I/O Module with Autocalibration
