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Maxim > Design Support > Technical Documents > Subsystem Boards > APP 5827

Keywords: Petaluma MAXREFDES30, 16-bit 8-channel simultaneous-sampling analog front end

SUBSYSTEM BOARD 5827

Petaluma (MAXREFDES30#): 8-Channel Simultaneous-

Sampling Analog Front End

Apr 28, 2014

Abstract: The Petaluma (MAXREFDES30#) subsystem reference design is a cost optimized, high-speed and high-accuracy analog

measurement solution for three-phase power monitoring applications. Hardware, firmware, design files, and lab measurements

provide complete system information for rapid prototyping and development.

Introduction

Three-phase power measurement applications require

multiple analog inputs for voltage and current

measurements on each line of the three-phase system. A

power monitoring system must sample all of the analog

inputs simultaneously to accurately calculate the

instantaneous power consumption.

The Petaluma (MAXREFDES30#) subsystem reference

design provides eight high-speed, 250ksps, 16-bit

simultaneous-sampling analog input channels that accept

±10V input signals.

The Petaluma design utilizes two quadruple ultra-precision,

ultra-low-noise input buffers (MAX44252); an 8-channel,

16-bit simultaneous-sampling ADC (MAX11046B); an ultra-

high precision 4.096V voltage reference (MAX6126); and

regulated +10V, -10V, and +5V power rails (MAX1659,

MAX765

/LM337, MAX8881). In addition to three-phase

power measurement applications, this subsystem also

performs well in any application that requires multiple

simultaneous sampling of analog inputs, such as

multiphase motor control and industrial vibration sensing.

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Summary of content (10 pages)

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Maxim > Design Support > Technical Documents > Subsystem Boards > APP 5827 Keywords: Petaluma MAXREFDES30, 16-bit 8-channel simultaneous-sampling analog front end SUBSYSTEM BOARD 5827 Petaluma (MAXREFDES30#): 8-Channel SimultaneousSampling Analog Front End Apr 28, 2014 Abstract: The Petaluma (MAXREFDES30#) subsystem reference design is a cost optimized, high-speed and high-accuracy analog measurement solution for three-phase power monitoring applications.
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Figure 1. The Petaluma subsystem design block diagram.
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The MAX11046 (U3) is a low-cost, 8-channel, 250ksps, 16-bit, single-supply, bipolar, simultaneous-sampling ADC. Although the MAX11046 ADC has an internal 4.096V voltage reference, Petaluma uses an external MAX6126 (U4) voltage reference to provide the highest possible accuracy. The MAX6126 has an initial accuracy of 0.02% and a 3ppm/°C maximum temperature coefficient (tempco). By default, the Petaluma is powered from the 12V and 3.
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Figure 2. FMC connector pin connections. Table 1 shows the power requirements. Table 2 shows currently supported platforms and ports.
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Table 1. Power Requirement for the Petaluma Subsystem Reference Design Power Type Jumper Shunt On-board power JU1–JU4: 1–2 External power JU1–JU4: 2–3 Input Voltage (V) Input Current (mA, typ) 3.3 6.2 12 70 3.3 6.2 5 41.4 10 9.4 -10 9.4 Table 2. Supported Platforms and Ports Supported Platforms Ports ZedBoard platform (Zynq®-7020) J1 Detailed Description of ZedBoard Firmware Table 2 shows the currently supported platforms and ports.
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Figure 3. The Petaluma firmware flowchart. The firmware accepts commands, configures the ADC, and is capable of downloading blocks of sampled data to a standard terminal program through a virtual COM port. The complete source code is provided to speed up customer development. The corresponding firmware platform files contain code documentation. Quick Start Required equipment: Windows® PC with two USB ports Petaluma (MAXREFDES30#) board Petaluma-supported platform (i.e.
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Download, read, and carefully follow each step in the appropriate Petaluma (MAXREFDES30#) ZedBoard Quick Start Guide. Lab Measurements Equipment used: Audio Precision® SYS-2722 signal source or equivalent Voltage calibrator DVC-8500 Windows PC with two USB ports Petaluma (MAXREFDES30#) board ZedBoard kit Take special care and use proper equipment when testing the Petaluma design. Duplication of the presented test data requires a signal source with higher accuracy than the design being tested.
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Figure 5. AC FFT for channel 7 (AIN7) using on-board power, a -2.5V to +2.5V, 10kHz sine wave input signal, a 250ksps sample rate, and a Blackman-Harris window at room temperature.
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Figure 6. DC histogram for channel 7 (AIN7) using on-board pwer; a 0V DC input signal; a 250ksps sample rate; 65536 samples; a code spread of 21 LSBs with 97.7% of the codes falling within the three center LSBs; and a standard deviation of 0.711 at room temperature. All Design Files Download All Design Files Hardware Files Schematic Bill of materials (BOM) PCB layout PCB Gerber PCB CAD (PADS 9.
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ARM is a registered trademark and registered service mark of ARM Limited. Audio Precision is a registered trademark of Audio Precision, Inc. Cortex is a registered trademark of ARM Limited. Eclipse is a trademark of Eclipse Foundation, Inc. Windows is a registered trademark and registered service mark of Microsoft Corporation. Xilinx is a registered trademark and registered service mark of Xilinx, Inc. ZedBoard is a trademark of ZedBoard.org. Zynq is a registered trademark of Xilinx, Inc.