8.2.1

About the MMB3

+5VA

-5VA

+5VD

+3.3V

+1.8V

+10V

-10V

PWR&VREF

USB

USB

RESET

DAC1220

TUSB3410

MSP430F449

+1

-1

DAC

IN

OUT

Analog

Daughtercard

Modular

Connectors

Power

Powerfrom

PWR&VREFBlock

Serial

Joystick

RESET

OPER

LCDDISPLAY

BSL

2.5V

Suppliedto

Daughtercard

PowerConnector

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ADS1246EVM-PDK Kit Operation

CAUTION

Do not misalign the pins when plugging the ADS1246EVM into the MMB3.

Check the pin alignment carefully before applying power to the PDK.

Step 4.

Set the jumpers and switches on the ADS1246EVM as shown in Figure 3 (note that these

settings are the factory-configured settings for the EVM).

The MMB3 is a Modular EVM System motherboard. It is designed around the MSP430F449, a low-power

microcontroller from Texas Instruments. Figure 8 shows a block diagram of the MMB3.

Figure 8. MMB3 Block Diagram

The MMB3 was designed to be used as a stand-alone demonstration platform for low-speed data

converters. It features an onboard 20-bit digital-to-analog converter (DAC) that can be used as a signal

source for an ADC under test, and has a joystick for control of functions on the board when it is not

controlled by a PC. These features are experimental and not supported in the ADS1246EVM-PDK at

this time.

The MMB3 derives power from the USB interface, and generates +5VD, 3.3V, and 1.8V, as well as +5VA,

–5VA, and

±10V. The ±10V is supplied to the daughtercard power connector as +VA and –VA.

SBAU149A – June 2009 – Revised July 2009

ADS1146EVM, ADS1246EVM, ADS1146EVM-PDK, ADS1246EVM-PDK

11

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