FMCADC2 HDL Project (OBSOLETE)

Warning

The support for FMCADC2 HDL project has been discontinued, the latest release branch where it can be found is hdl_2021_r2. This page is left for legacy purposes only.

Overview

The AD-FMCADC2-EBZ is a high-speed data acquisition (1 ADC channel at 2500 MSPS), in an FMC form factor, which has one high-speed JESD204B Analog to Digital converter (AD9625) on it.

The AD9625 is a 12-bit monolithic sampling ADC that operates at conversion rates of up to 2.5 GSPS. This product is designed for sampling wide bandwidth analog signals up to the second Nyquist zone. The combination of wide input bandwidth, high sampling rate, and excellent linearity of the AD9625 is ideally suited for spectrum analyzers, data acquisition systems, and a wide assortment of military electronics applications, such as radar and jamming/antijamming measures.

The card is mechanically (width/depth, but not height) and electrically compliant to the FMC standard (ANSI/VITA 57.1).

The reference design includes the device data capture via the JESD204B serial interface and the SPI interface. The samples are written to the external DDR-DRAM. It allows programming the device and monitoring it’s internal registers via SPI.

Supported boards

Note

Note for rev. C:

If you have a revision C board as indicated in etch next to the white scratch pad area of the PCB, we recommend writing to the Serial Output Adjust Register. If you are using the reference design this is done for you. Otherwise, when you configure the AD9625 it is suggested that you increase the serial output emphasis by writing to register 0x015 bits 5:4 either 10 or 11.

Supported devices

Supported carriers

Block design

Clock configuration

The AD-FMCADC2-EBZ provides multiple options for clocking the AD9625. The default configuration of the board clocks the ADC using an on-board 2.5 GHz, low noise, crystal oscillator. This oscillator is then routed through a wide band transformer producing the differential clock for the ADC.

Alternatively, the oscillator can be disconnected and an external clock source connected by only changing two components on the board. A single ended clock connected to the CLK+ input would then be routed through the transformer in the same way.

Finally, the option exists to connect a differential clock to the board using both the CLK+ and CLK- inputs. Then referencing the schematic make the component changes to directly route the differential input bypassing the transformer.

The AD-FMCADC2-EBZ uses a passive front end designed for very wide bandwidth. A single ended input needs to be provided to “Ain”. A 500 kHz to 6 GHz broadband balun then converts the input signal to differential.

CPU/Memory interconnects addresses

The addresses are dependent on the architecture of the FPGA, having an offset added to the base address from HDL (see more at CPU/Memory interconnects addresses).

Instance

Zynq/Microblaze

axi_ad9625_core

0x44A1_0000

axi_ad9625_xcvr

0x44A6_0000

axi_ad9625_jesd

0x44AA_0000

axi_ad9625_dma

0x7C42_0000

SPI connections

SPI type

SPI manager instance

SPI subordinate

CS

PS

SPI 0

AD9625

0

PS

SPI 1

ADF4355

0

GPIOs

GPIO signal

Direction

HDL GPIO EMIO

Software GPIO

Software GPIO

(from FPGA view)

Zynq-7000

Zynq MP

adc_irq

INOUT

33

87

111

adc_fd

INOUT

32

86

110

Interrupts

Below are the Programmable Logic interrupts used in this project.

Instance name

HDL

Linux Zynq

Actual Zynq

Linux ZynqMP

Actual ZynqMP

S10SoC

Linux Cyclone V

Actual Cyclone V

axi_ad9625_dma

13

57

89

109

141

30

53

85

axi_ad9625_jesd

12

56

88

108

140

29

52

84

Building the HDL project

The design is built upon ADI’s generic HDL reference design framework. ADI distributed the bit/elf files of this project as part of the ADI Kuiper Linux until the 2021_R2 release. The prebuilt files can be found in the previous link. Afterwards, it was discontinued.

But, if you want to build the sources, ADI makes them available on the HDL repository. To get the source you must clone the HDL repository and checkout the last release branch where this project still exists, hdl_2021_r2.

Then go to the hdl/projects/fmcadc5/$carrier location and run the make command.

Linux/Cygwin/WSL

/hdl$
git checkout hdl_2021_r2
/hdl$
cd projects/fmcadc2/zc706
/hdl/projects/fmcadc2/zc706$
make

Resources

More information

Support

Analog Devices, Inc. will provide limited online support for anyone using the reference design with ADI components via the EngineerZone FPGA reference designs forum.

For questions regarding the ADI Linux device drivers, device trees, etc. from our Linux GitHub repository, the team will offer support on the EngineerZone Linux software drivers forum.

For questions concerning the ADI No-OS drivers, from our No-OS GitHub repository, the team will offer support on the EngineerZone microcontroller No-OS drivers forum.

It should be noted, that the older the tools’ versions and release branches are, the lower the chances to receive support from ADI engineers.