MAX1385EVKIT+ Maxim Integrated Products, MAX1385EVKIT+ Datasheet

MAX1385EVKIT+

Manufacturer Part Number

MAX1385EVKIT+

Description

EVAL KIT FOR MAX1385

Manufacturer

Maxim Integrated Products

Datasheets

1.MAX1385EVKIT.pdf (6 pages)

2.MAX1385EVKIT.pdf (15 pages)

Specifications of MAX1385EVKIT+

Main Purpose

Interface, Analog Front End (AFE)

Utilized Ic / Part

MAX1385

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Secondary Attributes

Embedded

Primary Attributes

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Current page: 1 of 6
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APPLICATION NOTE 4065

Implementing a MAX1385-Based Control Loop in C/C++

When used with the MAX1385EVKIT+ demo board, the control loop achieves a regulation accuracy of ±2%. This

accuracy is limited by the gate driver output step size and the FET transconductance. Drain-current regulation

step size is determined by the MAX1385's gate-voltage increment multiplied by the FET's effective

transconductance. Because the MAX1385EVKIT uses an IRFZ44N MOSFET to close the loop for demonstration

purposes, the regulation may not be the same as it would be when used with an LDMOS FET.

Required Hardware

Setup

Download and unzip the necessary

Assemble the hardware according to Figure 1.

Maxim

Keywords:

Abstract: Maxim's MAX1385 evaluation kit (EV kit) software includes a Windows® graphical user interface

(GUI) program; however, the time cost of updating this display interferes with the control loop. This application

note shows a more optimal control-loop program, using a console menu system instead of a GUI.

Maxim MAX1385EVKIT+

Maxim CMAXQUSB+ (includes USB A-B cable)

Windows 2000/XP PC with USB port

5VDC at 100mA power supply

10VDC at 1000mA power supply

DMM for measuring drain current

DMM for measuring drain voltage

DMM for measuring PGAOUT amplified current-sense voltage

Optional: oscilloscope for monitoring GATE1 voltage and PGAOUT1 drain current

Plug the CMAXQUSB header P3 into the MAX1385EVKIT connector J1.

Connect the MAX1385EVKIT's DRAIN1 and DRAIN2 pins to the current meter (-).

Connect the current meter (+) to the power supply (+).

Connect the MAX1385EVKIT's SOURCE1 and SOURCE2 pins to the power supply (-).

Connect the voltage meter (+) to the MAX1385EVKIT's DRAIN1 pin.

Connect the voltage meter (-) to the MAX1385EVKIT's SOURCE1 pin.

Connect the MAX1385EVKIT's AVDD pin to the DVDD pin (or, optionally, connect to an external 5V DC

supply).

App Notes

control loop, LDMOS, FET, bias, base station, power amplifier, RF

COMMUNICATIONS CIRCUITS

executable and source code files

TEMPERATURE SENSORS and THERMAL MANAGEMENT

(ZIP, 736kB).

Jun 10, 2007

Page 1 of 6

Related parts for MAX1385EVKIT+

MAX1385EVKIT+ Summary of contents

Page 1

... GUI. When used with the MAX1385EVKIT+ demo board, the control loop achieves a regulation accuracy of ±2%. This accuracy is limited by the gate driver output step size and the FET transconductance. Drain-current regulation step size is determined by the MAX1385's gate-voltage increment multiplied by the FET's effective transconductance ...

Page 2

More Detailed Image (PDF, 387kB) Figure 1. MAX1385EVKIT hardware configuration. Procedure Set the CMAXQUSB's VDD Select jumper to the 5V position. Connect the CMAXQUSB to the PC's USB port. If this is the first time a CMAXQUSB has been attached ...

Page 3

Source Code Walk-Through The source code was developed with the free dev-cpp IDE, which uses the GNU gcc-3.4.2 C++ compiler. Listing 1 shows a simplified version of the C++ code performed inside the regulation loop. Output statements and error handling ...

Page 4

D) Debug Messages X) exit --------------------------------------------- C Board connected. Got board banner: Maxim CMAXQUSB V01.04.32 > Searching for MAX1385... Found MAX1385 at 0x4e Note: when using MAX1385EVKIT with CMAXQUSB, connect 5V DVDD supply to AVDD. ============================================================ CmodComm test program main ...

Page 5

T W IH2 Write IH2 T W IL1 Write IL1 T W IL2 Write IL2 Write LDAC T W LT1 Write THRULO1 T W LT2 Write THRULO2 T W LW1 Write LOWIPE1 T W LW2 Write LOWIPE2 ...

Page 6

... Preview new application notes in your areas of interest as soon as they are published. Subscribe to Application Notes for weekly updates. Related Parts QuickView MAX11008: QuickView -- Full (PDF) Data Sheet MAX11014: QuickView MAX1385: QuickView MAX1386: AN4065, AN 4065, APP4065, Appnote4065, Appnote 4065 Copyright © by Maxim Integrated Products Additional legal notices: www.maxim-ic.com/legal www.maxim-ic.com/support www.maxim-ic.com/contact -- Free Samples EE-Mail - Page ...

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