AD9642-250EBZ

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The AD9642-250EBZ Evaluation Board is part of a family of Analog to Digital Converters (ADCs). The board allows the user to evaluate and debug the high performance, 14-bit, 500-MS/s (mega samples per second) AD9642 A/D converter. The ultra low-noise, 14-bit, 500 MS/S (mega samples per second) 50-MS/s (max.) throughput rate ADC is available with extended temperature range and enhanced ESD protection.

This Evaluation Board is designed to provide users with a low cost, easy to use, and versatile platform for evaluating the performance of the AD9642 A/D converter. This board helps the user to evaluate the AD9642’s dynamic performance, precision, accuracy, power consumption, noise performance, and other features. The Evaluation Board includes an on-board power supply, an OLED display, an active filter, and an Analog Input Reference Buffer that are powered by the AD9642.

The AD9642-250EBZ Evaluation Board supports single-ended and differential input analog signals for conversions from 0-2.5V to 0-5V and is rated to operate up to ±5V differential input ranges. The accepted input ranges are software selectable and programmable using the on-board SPI (Serial Peripheral Interface) port. The board itself contains two identical, half-size evaluation boards and contains all necessary external components to evaluate the AD9642.

The board features an on-board power supply (consisting of a low-noise Linear Technology® L6130-CM voltage regulator) and an active filter (consisting of an LTC2751-1 precision operational amplifier with a wide common-mode voltage range and unity gain-bandwidth of 1.2MHz) for low noise performance. The active filter also provides precise input gain control, low-drift characteristics, and overload protection. The board also features an on-board OLED display (LEDs with power status) to help evaluate the performance of the AD9642.

The AD9642-250EBZ Evaluation Board also includes an Analog Input Reference Buffer. The Input Reference Buffer provides unity gain buffering of analog signals from 0-2.5V to 0-5V at a maximum slew rate of 7V/μs. It features low 0.1% gain drift, low-value input capacitance, and high-impedance input to reduce load on the external analog signal source.

The AD9642-250EBZ Evaluation Board is designed to ease debugging of the AD9642. The board includes a host of features including two-command power up and down sequence for fast startups, power monitoring of AVDD, full-scale setting up to 4Vp-p, and output power adjustment of 0.5V, 1V, 2V, and 4V. Additionally, the board supports data output port synchronization and count control. Also, the board includes an 8-bit DAC calibration ref voltage at mid-scale, 0-3V rated reference output voltage, 0V-5V adjustable reference voltage, and 10-bit digital I/O and a current source to provide a constant current source for input voltage range selection.

In summary, the AD9642-250EBZ Evaluation Board is designed to help users evaluate and debug the high-performance, 14-bit, 500 MS/S ADC with ultra-low noise and extended temperature range. The board includes an active filter and an Analog Input Reference Buffer as well as an OLED display, on-board power supply, and all the necessary external components. The agreed input ranges are software-selectable and programmable using the on-board SPI port. This board effectively helps the user evaluate the AD9642’s dynamic performance, precision, accuracy, power consumption, noise performance, and other features to ultimately help speed up the development process.

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