MAX11410BOB

MAX11410 Breakout Board - 24-bit 1.9ksps Delta-Sigma ADC

Pinout

Datasheet

http://www.maximintegrated.com/products/MAX11410BOB

Notes

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PRELIMINARY

Analog-to-digital converters (ADCs) provide accurate measurement and conversion of signals to digital format for sensing in many electronic applications such as industrial, medical and sensor systems. The MAX11410 is a high speed, 24-bit Delta-Sigma ADC. Development with Delta-Sigma ADCs involves expertise in analog systems, power supplies, digital interfaces and firmware. Now, enter the MAX11410BOB to accelerate the development process.

The MAX11410BOB Breakout Board provides for rapid prototyping and development with the MAX11410 (a 24-bit, 1.9ksps, Delta-Sigma ADC). MAX11410BOB interfaces to any Arduino™-compatible or mbed.org™ compatible platform system with expansion ports configurable for SPI communication. Additionally, the MAX11410BOB works with systems that have a Pmod™ connection, a 2x6 right-angle header at board edge (compatible with Digilentinc.com Pmod™ interface spec) Interface type 2A (expanded SPI) on 2x6 header at board edge. MAX11410 also comes with schematics, design files, and firmware for immediate use and forking to future projects.

The board interfaces to SPI with logic levels in the range 1.71V to 5.5V.

The board comes installed with MAX11410ATI+ installed.

Detailed Description of Hardware

The MAX11410 is a 24-bit, 1.9ksps, Delta-Sigma ADC. Connect analog inputs to the AIN0..AIN9 header pins. (The first 6 analog inputs are also connected to the standard Arduino analog pins on the external connector.) The MAX6126 provides the 2.5V analog reference voltage. The MAX8511 provides a low-dropout 3.3V supply. The MAX14931 digital isolator translates the external logic signals in the range of 1.71V to 5.5V for use with the MAX11410’s 3.3V supply. For more information on these products, please visit:

Measuring Temperature Using Thermocouple

Configure the MAX11410BOB board to measure temperature using a thermocouple as follows: 1. Install optional series resistors at Rxxx and Rxxx 2. Install optional shunt resistor or capacitor at Rxxx 3. Connect the thermocouple wires to the board at the TC header site. The square marks the positive lead which connects to AIN5 through optional resistor Rxxx. 4 For cold junction measurement, follow the instructions in Measuring Temperature Using RTD, and ensure the RTD is located close to the board. External voltage reference U4 MAX6126 provides a highly accurate +2.5V reference voltage at REF2P. The software library provides functions Configure_Thermocouple and Measure_Thermocouple. External reference provided to REF2P is compared with the voltage across the thermocouple, AIN5 - AIN6. The thermocouple voltage indicates the temperature difference between the "cold junction" (where the thermocouple wires connect to the board) and the "hot junction" (where the thermocouple wires are welded together). For best accuracy, an RTD is used to measure the temperature of the cold junction, which is then added to the thermocouple temperature difference to give the temperature at the hot junction. (Note that "cold junction" and "hot junction" are just terms of art, the hot junction does not need to be hotter than the cold junction.) << insert formula: temperature from thermocouple voltage measurement >> << insert example code using Configure_Thermocouple and Measure_Thermocouple >>

Measuring Temperature Using RTD

Configure the MAX11410BOB board to measure temperature using a resistive temperature device (RTD) as follows: 1. Connect the RTD wires to the board at the RTD header site. 2. Connect wire across J1 (AIN9 to REF1P) The software library provides functions Configure_RTD and Measure_RTD. The MAX11410 is configured to drive its internal current source from AIN8, through both the RTD and the high-accuracy reference resistor RREF between REF1P and REF1N. The ratio of (AIN8-AIN9)/(REF1P-REF1N) indicates the resistance ratio RRTD/RREF. The value of RREF must be known to good accuracy. From the measured resistance of the RTD, the temperature is calculated. << insert formula: temperature from RTD resistance measurement >> << insert example code using Configure_RTD and Measure_RTD >>

Table 1. Jumper Functions

JumperStateFunction
J21-2*Analog input AIN0 connects to Arduino pin A0
J31-2*Analog input AIN1 connects to Arduino pin A1
J41-2*Analog input AIN2 connects to Arduino pin A2
J51-2*Analog input AIN3 connects to Arduino pin A3
J61-2*Analog input AIN4 connects to Arduino pin A4
J71-2*Analog input AIN5 connects to Arduino pin A5
JREF2P1-2*Analog reference input REF2P is driven by on-board +2.5V reference (MAX6126)
J81-2*VDDREG supply is provided by on-board +3.3V regulator (MAX8511)
J131-2*AVDD supply is provided by on-board +3.3V regulator (MAX8511)
J151-2*VDDIO supply is provided by on-board +3.3V regulator (MAX8511)
J141-2*2.5V reference force/sense connection point
J171-2*MAX14931 GNDA-GNDB connection point
JREF1N1-2*Analog reference input REF1N ground reference
JREF2N1-2*Analog reference input REF2N ground reference
J1OpenAIN9 voltage measurement independent of REF1P reference resistor
1-2RTD sensor current flows from AIN9 into REF1P, for ratiometric measurement
TCOpenConnection point for optional Thermocouple temperature sensor
RTDOpenConnection point for optional Resistive Temperature Device sensor

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