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PIoandan merged 2 commits into from
Nov 20, 2025
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Add ADA4356 part in ADA4355 HDL project #1957

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projects/ada4355: Add reference to ADA4356 part.
PIoandan Nov 18, 2025
263de0c
docs/ada4355: Add ADA4356 part.
PIoandan Nov 18, 2025
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48 changes: 25 additions & 23 deletions docs/projects/ada4355_fmc/index.rst
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Expand Up @@ -6,19 +6,19 @@ ADA4355-FMC HDL project
Overview
-------------------------------------------------------------------------------

The :adi:`ADA4355` is a complete, high performance, current input µModule.
For space savings, the :adi:`ADA4355` includes all the required active and
passive components to realize a complete current to bits data acquisition
solution, supporting a small form factor, optical modules as well as
multichannel systems.

The high speed transimpedance amplifier (TIA) of the device supports 10 ns pulse
widths, allowing high spatial resolution for Time of Flight (ToF) measurements.
Additionally, the :adi:`ADA4355` includes three TIA gain (TZ) settings to
maximize dynamic range. An internal, selectable, analog low-pass filter (LPF)
can limit the device bandwidth with a corner frequency of 100 MHz to minimize
broadband noise while also serving as an antialiasing filter for the 125 MSPS
ADC.
The :adi:`ADA4355`/ :adi:`ADA4356` is a complete, high performance, current
input µModule. For space savings, the :adi:`ADA4355`/ :adi:`ADA4356` includes
all the required active and passive components to realize a complete current to
bits data acquisition solution, supporting a small form factor, optical modules
as well as multichannel systems.

The high speed transimpedance amplifier (TIA) supports short optical pulses:
10 ns for the ADA4355 and 20 ns for the ADA4356, enabling high spatial
resolution in Time of Flight (ToF) measurements. Both devices provide three TIA
gain (TZ) settings to maximize dynamic range. An internal, selectable,
analog low-pass filter (LPF) can limit the devices bandwidth with a corner
frequency of 100 MHz to minimize broadband noise while also serving as an
antialiasing filter for the 125 MSPS ADC.

The 14-bit ADC converts the amplified voltage signal at a rate of up to 125 MSPS
and outputs the digitized signals through two serial, low voltage differential
Expand All @@ -35,6 +35,7 @@ Supported devices
-------------------------------------------------------------------------------

- :adi:`ADA4355`
- :adi:`ADA4356`

Supported carriers
-------------------------------------------------------------------------------
Expand Down Expand Up @@ -69,23 +70,23 @@ The data path and clock domains are depicted in the below diagram:
Configuration modes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The BUFMRCE_EN configuration parameter defines the pinout used which is
differentiated by how the frame clock signals are distributed.
For one pinout version, the XDC constraints are not optimized for ISERDES,
as the frame clock signals are located in a different I/O bank from the other
related signals. To address this, a BUFMRCE buffer is used to distribute the
The BUFMRCE_EN configuration parameter defines the supported board used which
is differentiated by how the frame clock signals are distributed.
For ADA4355 the XDC constraints are not optimized for ISERDES, as the frame
clock signals are located in a different I/O bank from the other related
signals. To address this, a BUFMRCE buffer is used to distribute the
frame clock to all ISERDES instances.

By default it is set to 0. Depending on the pinout, some hardware modifications
By default it is set to 0. Depending on the part, some hardware modifications
need to be done on the board and/or ``make`` command:

In case of the pinout with optimized constraints:
In case of the ADA4356:

.. shell:: bash

$make BUFMRCE_EN=0

In case of the pinout with non-optimized constraints:
In case of the ADA4355:

.. shell:: bash

Expand Down Expand Up @@ -210,8 +211,8 @@ The Software GPIO number is calculated as follows:
.. admonition:: Legend
:class: note

- ``*`` instantiated only for BUFMRCE_EN=1
- ``**`` instantiated only for BUFMRCE_EN=0
- ``*`` instantiated only for BUFMRCE_EN=1 (ADA4355)
- ``**`` instantiated only for BUFMRCE_EN=0 (ADA4356)

Interrupts
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Expand Down Expand Up @@ -291,6 +292,7 @@ Hardware related
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

- Product datasheet: :adi:`ADA4355`
- Product datasheet: :adi:`ADA4356`

HDL related
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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1 change: 1 addition & 0 deletions projects/ada4355_fmc/README.md
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Expand Up @@ -10,6 +10,7 @@
| Part name | Description |
|------------------------------------------------|--------------------------------------------------------------|
| [ADA4355](https://www.analog.com/ada4355) | 14-Bit, 125MSPS, High performance, current input, data acquisition μModule |
| [ADA4356](https://www.analog.com/ada4356) | 14-Bit, 125MSPS, High performance, current input, data acquisition μModule |

## Building the project

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10 changes: 5 additions & 5 deletions projects/ada4355_fmc/zed/README.md
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Expand Up @@ -14,25 +14,25 @@ make

This project supports two pinout variants, which are differentiated by how the frame clock signals are distributed.

For one pinout version, the XDC constraints are not optimized for ISERDES, as the frame clock signals are located in a different I/O bank from the other related signals. To address this, a BUFMRCE buffer is used to distribute the frame clock to all ISERDES instances.
For ADA4355 the XDC constraints are not optimized for ISERDES, as the frame clock signals are located in a different I/O bank from the other related signals. To address this, a BUFMRCE buffer is used to distribute the frame clock to all ISERDES instances.

The overwritable parameters from the environment:

- BUFMRCE_EN - Specifies the evaluation board type
- 0 - pinout with optimized constraints (default)
- 1 - pinout with non-optimized constraints
- 0 - ADA4356 - pinout with optimized constraints (default)
- 1 - ADA4355 - pinout with non-optimized constraints

### Example configurations

#### BUFMRCE_EN disabled (default)
#### ADA4356 - BUFMRCE_EN disabled (default)

This specific command is equivalent to running `make` only:

```
make BUFMRCE_EN=0
```

#### BUFMRCE_EN enabled
#### ADA4355 - BUFMRCE_EN enabled

```
make BUFMRCE_EN=1
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