AD777X-FMCZ HDL project

Overview

The EVAL-AD7770 / EVAL-AD7771 / EVAL-AD7779 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-AD7770/1/9

Supported devices

Supported carriers

Evaluation board	Carrier	FMC slot
EVAL-AD7770-ARDZ	ZedBoard	FMC LPC
EVAL-AD7771-ARDZ	ZedBoard	FMC LPC
EVAL-AD7779-ARDZ	ZedBoard	FMC LPC

Block design

Block diagram

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

Clock scheme

CPU/Memory interconnects addresses

Instance	Zynq
axi_ad777x_adc	0x43C0_0000
ad777x_dma	0x7C48_0000

SPI connections

SPI type	SPI manager instance	SPI subordinate	CS
PS	SPI 0	AD777x	0

GPIOs

GPIO signal	Direction	HDL GPIO EMIO	Software GPIO
	(from FPGA view)		Zynq-7000
RESET_N	OUT	39	93
GPIO2	INOUT	38	92
SDP_MCLK	OUT	35	89
SDP_CONVST	OUT	34	88
START_N	OUT	33	87
ALERT	IN	32	86

Interrupts

Instance name	HDL	Linux Zynq	Actual Zynq
ad777x_dma	10	54	86

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

Building the ZedBoard project:

~$

cd hdl/projects/ad777x_fmcz/zed

~/hdl/projects/ad777x_fmcz/zed$

make

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

Resources

HDL related

AD777X-FMCZ HDL project source code

IP name	Source code link	Documentation link
AXI_AD777x	library/axi_ad777x	AXI AD777x
AXI_CLKGEN	library/axi_clkgen	AXI CLK Generator
AXI_DMAC	library/axi_dmac	AXI DMAC
AXI_HDMI_TX	library/axi_hdmi_tx	AXI HDMI TX
AXI_I2S_ADI	library/axi_i2s_adi	—
AXI_SPDIF_TX	library/axi_spdif_tx	—
AXI_SYSID	library/axi_sysid	AXI System ID
SYSID_ROM	library/sysid_rom	AXI System ID
UTIL_I2C_MIXER	library/util_i2c_mixer	—
UTIL_CPACK2	library/util_pack/util_cpack2	Channel CPACK Utility

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.