MAXADCLITE+

19-5610; Rev 1; 8/11 MAXADClite Evaluation Kit The MAXADClite evaluation kit (EV kit) evaluates the MAX11645, Maxim's smallest, very-low-power, 12-bit, 2-channel analog-to-digital converter (ADC). The EV kit allows usage of the ADC’s internal reference or an externally applied reference voltage. The EV kit includes Windows XP®-, Windows Vista®-, and Windows® 7-compatible software for data acquisition through a USB cable. Features S Windows XP-, Windows Vista-, and Windows 7-Compatible Software S USB-PC Connection (Cable Not Included) S USB Powered (No External Power Supply Required) S Real-Time Data Acquisition Through the USB EV Kit Contents The EV kit comes with the following components: • MAXADClite evaluation board • MAXADClite GUI application Ordering Information PART TYPE MAXADClite# EV Kit #Denotes RoHS compliant. Component List DESIGNATION C1, C2 C3, C5–C8 QTY DESCRIPTION DESIGNATION QTY 2 4.7kI Q5% resistors (0603) DESCRIPTION 2 18pF Q5%, 50V ceramic capacitors (0603) R3, R4 R5, R6 2 1kI Q5% resistors (0603) 5 1FF Q10%, 16V ceramic capacitors (0603) R7, R8 2 499kI Q5% resistors (0603) R9, R10 2 0I Q1% resistors (0603) 0 Not installed, resistors (0402) 4 0.1FF Q10%, 50V ceramic capacitors (0603) R11–R15 C9 1 10FF Q10%, 10V ceramic capacitor (0805) U1 1 12-bit ADC with internal reference (12 WLP) Maxim MAX11645EWC+ D1 1 Green LED (0603) D2 1 Yellow LED (0603) U2 1 16-bit microcontroller (64 LQFP) Maxim MAXQ622G-0000+ J1 1 Mini-USB type-B receptacle J2 0 Not installed, 10-pin JTAG connector U3 1 Ultra-low-noise, high-PSRR LDO linear regulator (5 SC70) Maxim MAX8511EXK33+ J3 1 4-pin header, 100 mill centers J5–J8 0 Not installed Y1 1 12MHz crystal R1, R2 2 27I Q5% resistors (0603) — 1 PCB: MAXADClite# C4, C10, C11, C12 *EP = Exposed pad. Windows, Windows XP, and Windows Vista are registered trademarks of Microsoft Corp. ________________________________________________________________ Maxim Integrated Products   1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Evaluates: MAX11645 General Description Evaluates: MAX11645 MAXADClite Evaluation Kit Quick Start The MAXADClite EV kit board is a plug-n-play dataacquisition kit that connects to the PC through a USB cable. The EV kit digitizes two different analog inputs and does not require an external power supply or a USB device driver. The EV kit is preloaded with default firmware that communicates with the MAXADClite evaluation software. Software can be installed and run on any Windows-based system. Note: In the following sections, software-related items are identified by bolding. Text in bold refers to items directly from the EV kit software. Text in bold and underlined refers to items from the Windows operating system. Procedure The EV kit is fully assembled and tested. Follow the steps below to acquire data through the EV kit: 1) Connect the EV kit board to a PC through the USB cable. The EV kit board receives power from the USB. 2) Connect the analog input(s) at AIN0 or AIN1 and AGND at J3. See Table 1 for more details. 3) Install and run the MAXADClite GUI application. 4) Once the status bar displays Hardware connected, select correct board rev of MAXADClite. 5) In Device Configuration options, make selections of the following: • Reference: Internal (default) or External • Channel: AIN0 (default) or AIN1 • Input Type: Single-Ended (default) or Differential • Input Polarity: Unipolar (default) or Bipolar 6) Next, select the Number of Samples from the Data Logging group box drop-down list. Once all options are set, press the Start Conversion button to proceed (Figure 1). Detailed Description of Hardware The MAXADClite EV kit board is loaded with the MAX11645, Maxim’s smallest, lowest power, 12-bit ADC. The ADC communicates through an I2C interface to the 16-bit RISC MAXQ622 microcontroller with integrated USB serial interface engine (SIE). This microcontroller can be configured as an HID device to communicate witht eh PC over USB (Figure 2). The EV kit microcontroller is preloaded with firmware that communicates with the EV kit GUI application. Upon receiving the logging command from the GUI, it acquires data from the ADC over the I2C bus and sends it to the PC for display and further analysis. Table 1. MAXADClite Connector J3 Description J3 PIN NO. LABEL FUNCTION 1 AVDD 3.3V, 100mA supply for external circuit 2 AIN0 ADC input to channel 0 3 AIN1 ADC input to channel 1 4 AGND Analog ground pin 2   _______________________________________________________________________________________ MAXADClite Evaluation Kit Evaluates: MAX11645 Figure 1. MAXADClite GUI Application AIN0 AIN1 MAX11645 ADC I2C MAXQ622 µC USB SIE PC Figure 2. MAXADClite Block Diagram _______________________________________________________________________________________   3 Evaluates: MAX11645 MAXADClite Evaluation Kit • • input. The default input configuration is single-ended unipolar. In differential mode, the input needs to be connected on both the analog inputs (AIN0 and AIN1) on J3. Refer to the MAX11644/MAX11645 IC data sheet for more information. MAXADClite Extended Features The ADC on the EV kit board can be selected for internal or external reference mode. The internal 2.048V reference is the default configuration. The external reference mode can be selected through software. Apply an external voltage between 1V and VDD at J5 (see Table 2). The input range of the EV kit software is selectable between a unipolar 0 to VREF or ±VREF/2 differential range. The input type is also software selectable between two single-ended inputs or one differential Table 2. MAXADClite Connector J5 Description • The EV kit board provides an external 5V supply at J6 to be used with any external circuit (see Table 3). • The microcontroller on the EV kit board can also be programmed with custom firmware through the J2 JTAG connector (see Table 4). Table 4. MAXADClite Connector J2 Description LABEL FUNCTION J2 PIN NO. LABEL 1 VREF External reference voltage input to the ADC 1 TCK Test clock 2 GND Digital ground pin 2 AGND Analog ground pin 3 TDO Test data output 4 +3V3 Supply voltage for reference only 5 TMS Test mode select 6 RST MAXQ610 microcontroller reset pin 7 N.C. No connect 8 VUSB* J5 PIN NO. Table 3. MAXADClite Connector J6 Description J6 PIN NO. LABEL FUNCTION 1 VUSB 5V, 300mA supply for the external circuit 2 GND Digital ground pin 9 TDI 10 GND FUNCTION 5V supply for the JTAG debug adapter Test data input Digital ground pin *Not directly connected to VUSB. Shunt J4 is for VUSB. 4   _______________________________________________________________________________________ MAXADClite Evaluation Kit Evaluates: MAX11645 Figure 3. MAXADClite EV Kit Schematic _______________________________________________________________________________________   5 Evaluates: MAX11645 MAXADClite Evaluation Kit 1.0’’ Figure 4. MAXADClite Component Placement Guide— Component Side 1.0’’ Figure 5. MAXADClite Component Placement Guide—Solder Side 1.0’’ Figure 6. MAXADClite PCB Layout—Component Side 1.0’’ Figure 7. MAXADClite PCB Layout—Solder Side 6   _______________________________________________________________________________________ MAXADClite Evaluation Kit REVISION NUMBER REVISION DATE 0 10/10 Initial release 1 8/11 Updated Ordering Information, Component List, and replaced PCB layout diagrams DESCRIPTION PAGES CHANGED — 1–5 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ©  2011 Maxim Integrated Products 7 Maxim is a registered trademark of Maxim Integrated Products, Inc. Evaluates: MAX11645 Revision History