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 3.3V outputs of the FMC connector on the ZedBoard, if all shunts are

installed in the 1–2 position. The MAX1659 (U5) and MAX8881 (U6) provide post-regulated 5V and 10V rails. The MAX765 DC-DC

inverter and LM337 negative LDO produce the -10V rail. To use external power supplies, move the shunts on all jumpers to the 2–

3 position. Connect the ground terminal of the external power supplies to the GND connector. Connect the 3.3V, 5V, 10V, and -10V

supplies to the corresponding connectors on the board.

Petaluma connects to FMC-compatible field-programmable gate array (FPGA)/microcontroller development boards. Petaluma

requires supply voltages of 3.3V and 12V from the FMC connector and uses the pin assignments illustrated in Figure 2.

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