PULSAR-ADC HDL project#

Overview#

Depending on the type of connector it uses, the Pulsar family is divided into the products which have PMOD connectors and FMC connectors.

PulSAR converters which have PMOD boards associated with them are low power ADCs which offer very high performance from 14-bits up to 18-bits with throughputs ranging from 100ksps to 1.3MSPS. The boards are designed to demonstrate the ADC’s performance and to provide an easy digital interface for a variety of system applications. The PulSAR family share the same interface and the same PCB, the differences being found in their performance. A full description of these products are available in their respective data sheets and should be consulted when utilizing the boards.

ADAQ40xx families is also part of the family of pulsar converters with PMOD connector. This type of boards come with the EVAL-PMD-IB1Z PMOD to field programmable gate array (FPGA) mezzanine card (FMC) interposer board that interfaces with the system demonstration controller board. The ADAQ4003 is an 18-bit precision data acquisition sub-system SiP design on a laminate that includes the AD4003 ADC with a fully differential driver the ADA4945-1, a reference buffer (the ADA4807-1), a precision resistor iPassive network on a separate die along with discrete capacitors and resistors. The device solves many design challenges for a wide range of applications similar to AD400x, yet it still provides the flexibility. It offers over 75% area savings compared to discrete design and reduces TTM.

PulSAR converters which have FMC boards associated with them are AD40xx family. The AD4003 / AD4007 / AD4011 / AD4020 are low noise, low power, high speed, 18-bit, precision successive approximation register (SAR) analog-to-digital converters (ADCs). The AD4003, AD4007, and AD4011 offer 2 MSPS, 1 MSPS, and 500 kSPS throughputs, respectively. They incorporate ease of use features that reduce signal chain power consumption, reduce signal chain complexity, and enable higher channel density. The high-Z mode, coupled with a long acquisition phase, eliminates the need for a dedicated high power, high speed ADC driver, thus broadening the range of low power precision amplifiers that can drive these ADCs directly while still achieving optimum performance. The input span compression feature enables the ADC driver amplifier and the ADC to operate off common supply rails without the need for a negative supply while preserving the full ADC code range. The low serial peripheral interface (SPI) clock rate requirement reduces the digital input/output power consumption, broadens processor options, and simplifies the task of sending data across digital isolation.

Applications:
  • Battery-powered equipment

  • Data acquisition

  • Instrumentation

  • Medical instruments

  • Process controls

  • Machine automation

Supported boards#

PulSAR with PMOD connector:

PulSAR with FMC connector:

Supported devices#

PulSAR with PMOD connector:

PulSAR with FMC connector:

Supported carriers#

Other required hardware#

Note

Only for ADAQ40xx

Block design#

Block diagram#

The data path and clock domains are depicted in the below diagrams:

PulSAR_ADC_PMDZ#

PulSAR_ADC_PMOD block diagram

PulSAR_ADC_FMC#

PulSAR_ADC_FMC block diagram

Configuration modes#

For AD40xx/ADAQ40xx projects the AD40XX_ADAQ400X_N parameter defines the type of ADC (AD40xx or ADAQ40xx). By default is set to 1. Depending on the project, some hardware modifications need to be done on the board and/or make command:

In case of the ADAQ40xx project:

make AD40XX_ADAQ400X_N=0

In case of the AD40xx project:

make AD40XX_ADAQ400X_N=1

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 HDL Architecture).

Instance

Address

spi_pulsar_adc_axi_regmap

0x44A0_0000

axi_pulsar_adc_dma

0x44A3_0000

spi_clkgen

0x44A7_0000

pulsar_adc_trigger_gen

0x44B0_0000

I2C connections#

I2C type

I2C manager instance

Alias

Address

I2C subordinate

PL

iic_fmc

axi_iic_fmc

0x4162_0000

PL

iic_main

axi_iic_main

0x4160_0000

Note

Only for AD40xx/ADAQ40xx

SPI connections#

SPI type

SPI manager instance

SPI subordinate

CS

PL

axi_spi_engine

PulSAR_ADC

0

GPIOs#

The Software GPIO number is calculated as follows:

  • Zynq-7000: if PS7 is used, then offset is 54

GPIO signal

Direction

HDL GPIO EMIO

Software GPIO

(from FPGA view)

Zynq-7000

pulsar_adc_spi_pd *

OUT

32

86

ad40xx_amp_pd **

INOUT

32

86

Legend

  • * instantiated only for PulSAR_ADC_PMDZ projects

  • ** instantiated only for AD40XX_ADAQ400X_N=1 (AD40xx)

Interrupts#

Below are the Programmable Logic interrupts used in this project.

Instance name

HDL

Linux Zynq

Actual Zynq

axi_pulsar_adc_dma

13

57

89

spi_pulsar_adc

12

56

88

Building the HDL project#

The design is built upon ADI’s generic HDL reference design framework. ADI does not distribute the bit/elf files of these projects so they must be built from the sources available here. To get the source you must clone the HDL repository, and then build the project as follows:.

Linux/Cygwin/WSL

1user@analog:~$ cd hdl/projects/pulsar_adc/zed
2user@analog:~/hdl/projects/pulsar_adc/zed$ make AD40XX_ADAQ400X_N=1

The result of the build, if parameters were used, will be in a folder named by the configuration used:

if the following command was run

make AD40XX_ADAQ400X_N=0

then the folder name will be:

AD40XX_ADAQ400X_N0

For projects that have coraz7s as a carrier, the build is done without parameters.

A more comprehensive build guide can be found in the Build a HDL project user guide.

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.