MB201A2V/MB201A20V Single Board Precision DVM with direct PC Interface The ALD MB201 is a precision +/-5½-digit Digital Voltmeter (DVM) printed circuit board that contains the ALD500R/ALD521D A/D Converter chipset that directly plugs into the parallel printer port of a PC computer. It features calibrated analog input (w/scalable input ranges), and digital circuitry to communicate with PC or other microprocessors. It is designed to be used as a stand-alone, embedded system component in a variety of applications including digital panel meters, customized instrumentation displays, temperature monitoring, high resolution DVM’s, weigh scales and others. Direct Full-scale analog input range is +/-2.00000V DC with a linearity of 0.005%. ALD's 18-bit plus sign integrating dual-slope analog processor (ALD500) functions as the input device and the ALD521D microprocessor IC implements the digital conversion, control mode and I/O functions. The MB201 supports two optional versions, each populated with different components and configurations: Mode A – calibrated reference used primarily for measurements against a calibrated reference voltage typically required in precision voltmeter applications. Mode A is the default version of MB201A. Mode B – ratio-metric intended for measurements against a ratio-metric reference voltage, such as those required in weigh scale applications. Mode B is a simple application specific adaptation of the standard MB201A. The MB201 board has a provision for PC interface (DB25), BASIC interface modules, and input resistor divider network for input scaling. Optional MS-DOS Software (P/N - MBCDROM) is also available for user setup and calibration. Only one copy of the software is necessary, regardless of the number of boards in use. DC Inputs are single ended or optionally fully differential, and features automatic zero and automatic input polarity detection. A DB25 connector is provided on-board, to conveniently interconnect the MB201 to a personal computer (PC) via the parallel printer port for operation, initial setup, and calibration. Hardware and Software Features Directly plug into a PC parallel printer port and displays readings on the monitor. Measurement Range: +/-2.00000V DC direct input. (Other ranges are user configurable and scalable, using both hardware and software scaling) All solid-state construction. User selectable +/-3½ to +/-6½ digits. Differential analog inputs with auto-polarity and auto-zero. Calibration for positive and/or negative inputs. Smart Input Filtering (Sample Averaging) selection for noise reduction and accurate displays. Optional MS-DOS software for user operation, setup, and calibration is sold separately. Rev 2.0 © 2012 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286 MB201 www.aldinc.com 1 of 3 Key Specifications MB201A2V Direct Full Scale Analog Input Range: +/- 2.00000V DC Input Impedance: 1GΩ min, 100GΩ typical. Optional on-board input resistor divider/preamplifier network for wide input voltage ranges Resolution: +/-1 digit, (+/-10µV) @ Vin = 1.00000V (16x input averaging) Overvoltage Protection: Not available Conversion Sample Rate: 3-samples/sec (from 1 sample/min. to 10 samples/sec.) No external power source necessary, draws power directly from the PC printer port Optional external Power Supply: +4.5 to +5.5V max @ 6mA max. Accuracy +/-0.02% (After 2 hour warm-up) Linearity +/-0.01% full-scale (23º C, +/-1º C). Logic Compatibility: CMOS inputs and outputs. MB201A20V Direct Full Scale Analog Input Range: +/-20.000V DC Input Impedance: 10MEGΩ nominal Optional on-board input resistor divider for wide input voltage ranges Resolution: +/-1 digit, (+/-100µV) @ Vin = 10.0000V (16x input averaging) Overvoltage Protection: 200V DC Conversion Sample Rate: 3-samples/sec (from 1 sample/min. to 10 samples/sec) No external power source necessary, draws power directly from the PC printer port Optional external Power Supply: +4.5 to +5.5V max @ 6mA max. Accuracy +/-0.02% (After 2 hour warm-up) Linearity +/-0.01% full-scale (23º C, +/-1º C). Logic Compatibility: CMOS inputs and outputs. Applications Applications for the M201 Board include embedded digital panel meters, customized instrumentation displays, temperature monitoring, high resolution DVM’s, weigh scales, signal conditioners, laboratory data-logging, process monitors, portable/field troubleshooting and calibration. Configuration & Outline Drawing All MB201 boards include a DB25 pin connector that plugs directly into the parallel printer port of a desktop or laptop PC computer for operation, initial setup & calibration. The board outputs 24 bit serial data to the PC or other digital processors for further data processing. Rev 2.0 © 2012 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286 MB201 www.aldinc.com 2 of 3 ALD500/ALD521D Chipset For complete technical information and operating specifications for the ALD chipset as well as other ALD products, you can download complete datasheets on-line. Environmental Operating Temperature range: 0 to 50º C. Storage Temperature range: -40 to +85 ºC. Humidity: to 90% (no condensation). Protection: no shielding - open board construction. Mechanical Outline Dimensions: 3.20 in. x 2.45 in. x 0.5 in. Mounting Holes: 0.125 in. diameter @ 0.125 in from 4 corners Weight: 1 ounce (28 grams) Nominal Ordering Information MB201 or MB201A2V (MODE A, DVM Mode) MB201Tyyyy where Tyyyy is a Custom Part Number designator MB201AxxV (Custom Option) where xx specifies the input voltage range, e.g. xx=20 for +/- 20V input voltage range MBCDROM (optional MS-DOS software for user operation, setup, and calibration, and user design documentation.) Rev 2.0 © 2012 Advanced Linear Devices, Inc. 415 Tasman Drive, Sunnyvale, CA 94089-1706 Tel: (408) 747-1155 Fax: (408) 747-1286 MB201 www.aldinc.com 3 of 3