Multifunction analog/digital I/O | Model 526

Model 526 Multifunction analog/digital I/O
  • Four 24-bit quadrature encoder inputs
  • Four 16-bit analog outputs
  • Eight 16-bit analog inputs
  • Eight digital I/O
  • Single supply (5 V) input power
  • Programmable interrupt timer
  • Versatile watchdog timer
  • xPC Target Real-time rapid prototyping software available through MathWorks


Model 526 is a versatile analog and digital I/O system on a PC/104 board. It has eight digital I/Os with edge detection, eight 16-bit analog inputs, four 16-bit analog outputs, four counter/timers that can directly interface to incremental encoders, an interrupt timer, and a watchdog timer. The board's high performance, compact size, and diverse resources make it ideally suited for a wide range of measurement and control applications.

Model 526 block diagram


Encoder Counters

The index and quadrature clock inputs accept both differential RS-422 or single-ended TTL/CMOS signals. When connected to an incremental encoder, the count resolution can be increased by selecting a x2 or x4 clock multiplier. Each counter can be programmed to cause an interrupt upon overflow. Counters can be configured as timers by selecting the board's internal clock (27 or 13.5 MHz). Timers can generate and output a "one-shot" pulse or a pulse-width-modulated waveform on one of the digital outputs.

Watchdog Timer

When the watchdog timer is enabled, it will time-out after a selected interval if it is not tagged. Upon time-out, the watchdog timer will activate two external solid state relays, one normally closed and one normally open.

Interrupt Timer

This timer provides a way of generating precise interrupts. Two operating modes are available: manual and auto-restart. In the manual mode, counting starts in response to a software command and stops when zero counts are reached. In Auto-restart mode the counter automatically reloads after zero counts are reached.

Analog Outputs

Each of the four 16-bit digital-to-analog converters (DACs) has independent preload buffers. A single command will update all DACs in about 32 uS. An interrupt can optionally be generated when the upload is complete. The board employs fully electronic calibration, and all boards are factory calibrated by storing calibration data in on-board, non-volatile memory.

Analog Inputs

The eight differential inputs are multiplexed to a 16-bit A/D. Multiple channels can be measured in response to a single command. Two reference channels (0 V and 10 V) can also be measured. The A/D converter is factory calibrated by storing the actual value of the on-board 10 V reference in the EEPROM.

Digital I/O

Eight I/O lines are available for use as general purpose inputs or outputs in groups of four. Interrupts can be generated on the rising or falling edge of every signal in both groups.

DC/DC Converter

A single 5 VDC power source is required. An on-board DC/DC converter generates all internal operating voltages.




Channels 4, 24-bit synchronous up/down with preload, interrupts
Input signals clockA, clockB, index
Differential RS-422 or single-ended 5 V TTL/CMOS
Encoder count rate 10 MHz at 1x
5 MHz at 2x
2.5 MHz at 4x
Interrupt Timer
Interrupt timer interval 100 µs to 25.5 ms
Watchdog Timer
Watchdog timer 0.125 to 16 seconds
Digital I/O
Channels 8 lines with outputs connected to inputs
Output drive current 25 mA
Output sink current 25 mA
Input pullup resistor 10 kΩ
Edge detection State change 0 to 1, 1 to 0
Analog Inputs
Channels 8 fully differential
A/D range ±10 V
A/D resolution 305 µV
A/D throughput 10 kHz one channel
A/D noise 2 sigma = 4 counts
A/D format 2’s complement
Analog Outputs
Channels 4
D/A range ±10 V
D/A resolution 305 µV
D/A throughput 10 kHz
D/A driver noise 2 sigma = 4 counts
D/A driver current ±5 mA
Power input 5 V, 280 mA

Model 526 dimensions



File Version Type Size
526 Hardware Manual1.0.0PDF424 KB
526 Software Manual1.0.0PDF34 KB


File Version Type Size
526 Software Development Kit1.0.0ZIP709 KB
Updated Windows DriverZIP9 KB
Other Operating Systems
Need a software development kit for another operating system? We can port our SDK to
your OS or provide the information you need to do it yourself. Contact Sales for details.

Pricing & Ordering

Model Description Qty 1 Qty 2-9 Order Qty.
526Multifunction analog/digital I/O$618$562
Breakout boards
7506TDINBreakout board, 40-pin, DIN rail mountable$85$78
7505TDINBreakout board, 50-pin, DIN rail mountable$87$79
Power supplies
207-01Isolated power supply, 5V$216$200
7409CCable, flat, 40 conductor, 18 inches$21$20
7409C1Cable, flat, 40 conductor, 1 meter$31$28
7501CCable, flat, 50 conductor, 18 inches$19$17
7501C1Cable, flat, 50 conductor, 1 meter$33$30

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