AD777X-ARDZ HDL project

Overview

The EVAL-AD7770-ARDZ / EVAL-AD7771-ARDZ / EVAL-AD7779-ARDZ evaluation kit features the AD7770, AD7771, and AD7779 24-bit, analog-to-digital converters (ADCs).

The AD777x is an 8-channel, simultaneous sampling analog-to-digital converter (ADC). Eight full Σ-Δ ADCs are on-chip. The AD777x provides an ultralow input current to allow direct sensor connection. Each input channel has a programmable gain stage allowing gains of 1, 2, 4, and 8 to map lower amplitude sensor outputs into the full-scale ADC input range, maximizing the dynamic range of the signal chain.

Supported boards

• EVAL-AD7770-ARDZ

• EVAL-AD7771-ARDZ

• EVAL-AD7779-ARDZ

Supported devices

• AD7770

• AD7771

• AD7779

Supported carriers

Evaluation board	Carrier	FMC slot
EVAL-AD7770-ARDZ	ZedBoard	PMOD-JA, PMOD-JB, PMOD-JC
EVAL-AD7771-ARDZ	ZedBoard	PMOD-JA, PMOD-JB, PMOD-JC
EVAL-AD7779-ARDZ	ZedBoard	PMOD-JA, PMOD-JB, PMOD-JC
EVAL-AD7770-ARDZ	De10-Nano	Arduino shield connector
EVAL-AD7771-ARDZ	De10-Nano	Arduino shield connector
EVAL-AD7779-ARDZ	De10-Nano	Arduino shield connector

Block design

Block diagram

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

Clock scheme

SPI connections

SPI type	SPI manager instance	SPI subordinate	CS
PS*	SPI 0	AD777x	0
PL**	sys_spi	AD777x	0

Legend

• * only for ZedBoard

• ** only for De10-Nano

GPIOs

GPIO signal	Direction	HDL GPIO EMIO	Software GPIO	Software GPIO
	(from FPGA view)		Zynq-7000	Cyclone V
RESET_N	OUT	39	93	7
GPIO2	INOUT	38	92	6
GPIO1	INOUT	37	91	5
GPIO0	INOUT	36	90	4
SDP_MCLK	OUT	35	89	3
SDP_CONVST	OUT	34	88	2
START_N	OUT	33	87	1
ALERT	IN	32	86	0

Interrupts

Instance name	HDL	Linux Zynq	Actual Zynq	Linux Cyclone V	Actual Cyclone V
ad777x_dma*	10	54	86
ad777x_dma**	5			45	77

Legend

• * only for ZedBoard

• ** only for De10-Nano

Building the HDL project

The design is built upon ADI’s generic HDL reference design framework. ADI distributes the bit/elf files of these projects as part of the ADI Kuiper Linux. 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.

Linux/Cygwin/WSL

Make for ZedBoard project:

user@analog:~$ cd hdl/projects/ad777x_ardz/zed
user@analog:~/hdl/projects/ad777x_ardz/zed$ make

Make for De10Nano project:

user@analog:~$ cd hdl/projects/ad777x_ardz/de10nano
user@analog:~/hdl/projects/ad777x_ardz/de10nano$ make

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

Resources

Hardware related

• Product datasheets:

  • AD7770

  • AD7771

  • AD7779

HDL related

• AD777X-ARDZ HDL project source code

IP name	Source code link	Documentation link
AXI_AD777x	library/axi_ad777x	here
AXI_CLKGEN*	library/axi_clkgen	here
AXI_DMAC	library/axi_dmac	here
AXI_HDMI_TX	library/axi_hdmi_tx	here
AXI_I2S_ADI*	library/axi_i2s_adi	—
AXI_SPDIF_TX*	library/axi_spdif_tx	—
AXI_SYSID	library/axi_sysid	here
SYSID_ROM	library/sysid_rom	here
UTIL_I2C_MIXER*	library/util_i2c_mixer	—
UTIL_CPACK2	library/util_pack/util_cpack2	here

Legend

• * only for ZedBoard

More information

• ADI HDL User guide

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.