AD4080

• Dual-path, low noise design for broad coverage from DC to 5GHz
  • High-speed path with AD9213, a low noise 12-bit ADC running at 10GSPS
  • ADL5580, a fully differential 10GHz ADC driver
  • Precision path with AD4080, a 20-bit, 40MSPS, differential SAR ADC reduces 1/f noise
• ADC driver input, biased with DAC output voltage, adjusts DC offset of unipolar signal
  • Single-ended unipolar signal with DC offset to differential signal conversion by ADL5580
  • ADL5580 biased by DAC LTC2664 output for maximizing AD9213 input dynamic range
• FMC+ HSPC connector for interface with Xilinx VCU118 FPGA board

The ADMX6001-EBZ is a reference design of a DC-coupled single channel 10GSPS digitizer featuring the AD9213, a low noise, 12-bit high-speed analog-to-digital converter (ADC) and the AD4080, a 20-bit precision ADC. The dual-path design achieves true low noise digitization in the broadband from DC to 5GHz. By biasing the ADC driver ADL5580 with the precision digital-to-analog converter (DAC) LTC2664, the ADMX6001-EBZ is capable of handling unipolar and bipolar signals at various DC levels, maximizing utility of the input dynamic range of AD9213. This design is ideal for high performance time-domain instruments such as time-of-flight mass spectrometry (TOF MS), distributed fiber optic sensing (DFOS), and digital oscilloscope.

This document guides the setup and evaluation of the ADMX6001- EBZ board in conjunction with the Xilinx VCU118 field programmable gate array (FPGA) board.

The EVAL-AD4080ARDZ evaluation board enables quick and easy evaluation of the performance and features of the AD4080/AD4081/AD4084. The EVAL-AD4080ARDZ is designed to demonstrate the performance of the AD4080/AD4081/AD4084 features in the ACE software environment. The EVAL-AD4080ARDZ evaluation kit supports the following AD4080/AD4081/AD4084 features:

• Serial peripheral interface (SPI) complementary metal-oxide semiconductor (CMOS) data output interface (read from first-in first out (FIFO))
• Analog-to-digital converter (ADC) configuration via SPI
• Internal or external generation of 1.1V regulated supply rails (external by default)
• Sampling rate capability 40/20/10MSPS (software selectable in ACE)

The EVAL-AD4080ARDZ evaluation board is designed for use with the system demonstration platform (SDP-K1) board to facilitate communication with the AD4080/AD4081/AD4084, enabling ADC configuration and data capture. The SDP-K1 controller board also provides the communication link to the host PC and the ACE software plugin. The primary controller board for the EVAL-AD4080ARDZ evaluation board is the SDP-K1. The EVAL-AD4080ARDZ evaluation board conforms to the Arduino Uno Shield mechanical and electrical standards to interface with the SDP-K1.

The EVAL-AD4080ARDZ evaluation solution includes the AD4080/AD4081/AD4084 industrial input and output (IIO) firmware application drivers for device configuration and ADC data capture. It also includes the AD4080/AD4081/AD4084 ACE plugin graphical interfaces (GUIs) for performance evaluations.

For full details, see the AD4080/AD4081/AD4084 data sheets, which must be used in conjunction with this user guide when using the EVAL-AD4080ARDZ.

• Companion module for Active Learning labs and workshops on ADCs, mixed-mode signal chain, and DSP related topics
• IIO-based software stack for broad, cross-platform compatibility with industry-standard tools, MATLAB, Python, and other languages
• Configurable 2nd-order analog filter for exploring the interaction between analog and digital filters
• Onboard clock divider provides sample rates from 5 MSPS to 40 MSPS
• Single USB connection provides all power and connectivity

The Analog Devices Active Learning Module - Mixed-Mode Signal Chain (ADALM-MMSC) is an educational board that facilitates hands-on exploration of fundamental signal chain concepts. The core of the circuit is the AD4080, 40 MSPS oversampling SAR analog-to-digital converter (ADC) with configurable digital filter and internal data capture memory (single-port FIFO). The board includes a highly configurable 2nd order analog filter with adjustable cutoff frequencies, input attenuation, and filter gain. An onboard selectable clock source provides sample rates from 5 MSPS to 40 MSPS. A MAX32666FTHR microcontroller runs an IIO server over a serial backend, allowing the use of standard tools such as Scopy, IIO Oscilloscope, Pyadi-iio, and ADI's MATLAB precision toolbox. The Libiio library provides language bindings for C, C#, MATLAB, Python, and other languages.

Concepts demonstrated include:

• Digital filtering
• Analog vs. digital anti alias filtering
• Properties of different digital filters
• Noise analysis
• Reference noise

APPLICATIONS

• Mixed Signal and Digital Signal Processing experiments, workshops, and lab exercises
• Precision data acquisition

• Full featured evaluation board for the AD4080/AD4081/AD4084
• Analysis | Control | Evaluation (ACE) Software plug-in available for device configuration, data capture, and performance evaluation
• Flexible analog front end
• On-board power solution and precision reference
• On-board clock generation circuitry with sampling frequency control via the ACE Software
• FMC compatible

The EVAL-AD4080-FMCZ is designed to demonstrate the performance of the AD4080, AD4081, AD4082 analog‐to‐digital converter (ADC) and provide access to a limited set of device configuration features through the ACE Software environment. The EVAL-AD4080-FMCZ evaluation kit supports the following AD4080/ AD4081/AD4082 features

• Low voltage digital signaling (LVDS) data output interface.
• ADC configuration via serial peripheral interface (SPI).
• Internal or external generation of 1.1 V regulated supply rails.
• Sampling rate capability between 1.25 MSPS and up to 40 MSPS, depending on the specific ADC

The EVAL-AD4080-FMCZ evaluation board was designed for use with the Digilent ZedBoard via the field programmable gate array (FPGA) mezzanine card (FMC) connector. The ZedBoard uses a Xilinx Zynq7000 system on chip (SoC) running Analog Devices, Inc., Kuiper Linux and LIBIIO included on the SD card supplied in the evaluation board kit to facilitate communication with the EVALAD4080-FMCZ, enabling ADC configuration and data capture and to additionally provide the communication link to the host PC and the ACE Software plug-in.

The AD4080 that is physically mounted on the board can be evaluated with any sampling frequency range from 1.25MHz to 40MHz. However, performance of either the AD4081 or AD4082 can also be estimated using this board by setting the sampling frequency to 20MHz or 10MHZ respectively. Note, the captured results for AD4080 running at the reduced sample rate must be used as an estimate of the SNR achievable with the lower speed generics, rather than the actual measurement. Nevertheless, measured SNR for the AD4081 or AD4082 is not lower than that of the AD4080 running in the reduced throughput configuration.