Maxim-integrated MAXREFDES24EVSYS Uživatelský manuál stáhnout pdf (Strana 15)

MAXREFDES24EVSYS User Manual

Rev 0 15

5 Hardware Description

This section provides more information on the hardware design of the three boards including schematics, bill of

materials, and PCB layout files.

5.1 MAXREFDES24

The MAXREFDES24 reference design is a 4-channel analog output (AO) subsystem that generates controlled

voltages or current loop signals using four (4) output conditioners (MAX15500

) and a 4-channel 16-bit DAC

(MAX5134). For maximum performance, an ultra-high precision 4.096V voltage reference (MAX6126) is

included. A 600V

RMS

digital isolator (MAX14850), power transformer, and flyback controller (MAX17498)

provide the necessary isolated data and power connections to the analog sub-system.

Reference Schematic 5839

provides more information on the MAXREFDES24 design and includes

performance test results of the reference design when used with a Xilinx development system. Refer to this

online document for links to the latest hardware design files, test results, relevant application notes, and project

files for select Xilinx development kits. Below is a summary of the hardware design files available on the USB

flash drive for the MAXREFDES24 design.

USB Flash Drive

Bill of Materials



PCB Source Files 

Schematics (PDF)



Layout (PDF)



Layout (Gerber) 

5.2 MAXADCLITE2

The MAXADCLite2 board utilizes a low-power, 2-channel, 12-bit ADC (MAX11645) with an input circuit that

offers basic input protection, selectable current loop termination (jumpers J4, J9), and a divide-by-5 resistor

ladder for scaling analog signals (up to 10V) to levels compatible with the ADC’s 2.048V internal reference. A

microcontroller (MAXQ622

) provides bridge functionality between a USB HID interface and I

C-compatible

bus. The described limitations are reflected by the suffix “Lite” in the name of the board. For more information

on the MAX11645 and full evaluation kits, go to

www.maximintegrated.com/MAX11645.

5.3 USB2PMB1

The USB2PMB1 board uses the FT2232HL, a USB 2.0 high-speed (480Mbps) to UART/FIFO IC, to process

commands sent by a GUI application running on the PC. The design integrates a 4K MICROWIRE®-

compatible serial EEPROM (93LC66BT) and a low-power, 1.2A, PWM step-down DC-DC converter

(MAX1556

) for generating 3.3V (VCCIO) from the 5V USB supply. VCCIO provides power to the FTDI chip, the

4K MICROWIRE EEPROM, and to the 12-pin connector for 3.3V Pmod Type 2A-compatible boards.

For more information on the USB2PMB1 hardware design or other compatible boards from Maxim Integrated,

go to www.maximintegrated.com/USB2PMB1

. For more information on the Pmod form factor, refer to the

Digilent Pmod

Interface Specification or visit www.DigilentInc.com.

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