Analog Devices EVAL-AD2437B1MZ User manual

EVAL-AD2437B1MZ Manual
Revision 2.1 , August 2023
Part Number
EVAL-AD2437B1MZ
Analog Devices, Inc.
One Technology Way
Norwood, MA 02062-9106

Copyright Information
© 2023 Analog Devices, Inc., ALL RIGHTS RESERVED. This document may not be reproduced in any form
without prior, express written consent from Analog Devices, Inc.
Disclaimer
Analog Devices, Inc. reserves the right to change this product without prior notice. Information furnished by Ana-
log Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its
use; nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under the patent rights of Analog Devices, Inc.
Trademark and Service Mark Notice
The Analog Devices logo, Blackfin, SHARC, A2B, SigmaDSP, SigmaStudio+, and EngineerZone are registered
trademarks of Analog Devices, Inc.
All other brand and product names are trademarks or service marks of their respective owners.
Regulatory Compliance
The EVAL-AD2437B1MZ evaluation board is designed to be used solely in a laboratory environment. The board is
not intended for use as a consumer-end product or as a portion of a consumer-end product. The board is an open
system design, which does not include a shielded enclosure and, therefore, may cause interference to other electrical
devices in close proximity. This board should not be used in or near any medical equipment or RF devices.
The EVAL-AD2437B1MZ evaluation board contains ESD (electrostatic discharge) sensitive devices. Electrostatic
charges readily accumulate on the human body and equipment and can discharge without detection. Permanent
damage may occur on devices subjected to high-energy discharges. Proper ESD precautions are recommended to
avoid performance degradation or loss of functionality. Store unused boards in the protective shipping package.
EVAL-AD2437B1MZ Manual ii

Contents
Preface
Purpose of This Manual.................................................................................................................................1–2
Manual Contents ........................................................................................................................................... 1–2
Technical Support.......................................................................................................................................... 1–3
Supported Integrated Circuit ......................................................................................................................... 1–3
Supported Tools............................................................................................................................................. 1–3
Product Information...................................................................................................................................... 1–3
Analog Devices Website.............................................................................................................................. 1–3
EngineerZone ............................................................................................................................................. 1–4
Using the Board
Product Overview .......................................................................................................................................... 2–1
Package Contents........................................................................................................................................... 2–2
Default Configuration ................................................................................................................................... 2–2
Reference Design Information .......................................................................................................................2–3
AD2437 - Audio Bus A2B Transceiver ........................................................................................................... 2–3
ADA4661 -18 V, Precision, 725 µA, 4 MHz, CMOS RRIO Operational Amplifier ...................................... 2–4
ADAU1701 SigmaDSP 28-/56-Bit Audio Processor with Two ADCs and Four DACs .................................. 2–4
ADP2360 - 50 mA, 60 V, High Efficiency Buck Regulator............................................................................ 2–5
BD28623MUV - Class D Speaker Amplifier ................................................................................................. 2–5
IM69D120 High Performance Digital MEMS Microphone .......................................................................... 2–5
LT3502/LT3502A - 1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm × 2mm DFN and MS10 .... 2–5
M24512-RMN6TP - Automotive 512-Kbit Serial I2C EEPROM with 1MHz clock..................................... 2–6
Hardware Reference
Connectors .................................................................................................................................................... 3–1
Stereo Connectors( TP5-TP8 ).................................................................................................................. 3–2
Audio I2S Connector ( P1) ........................................................................................................................ 3–3
EVAL-AD2437B1MZ Manual iii

SigmaStudio+ ( P2) .................................................................................................................................... 3–3
Multipurpose pins( P5 ) ............................................................................................................................. 3–3
ADC Input Connector( P7 ) ...................................................................................................................... 3–3
DAC Output Connector( P20 ) ................................................................................................................. 3–3
A2B ( P27 and P21) .................................................................................................................................. 3–3
Jumpers ......................................................................................................................................................... 3–4
AD2437 SIO0 Routing ( P4) ..................................................................................................................... 3–4
AD2437 SIO1 Routing ( P23)................................................................................................................... 3–5
AD2437 BCLK Select ( P16)..................................................................................................................... 3–5
ADAU1701 I2C Bus Switch ( P18 and P22)......................................................................................... 3–5
LEDs ............................................................................................................................................................. 3–5
A2B Interrupt ( DS2).................................................................................................................................. 3–6
Power Status Indicator ( DS1, DS3, DS5) ................................................................................................. 3–6
I2C Bus Switch ( DS4) ............................................................................................................................... 3–7
BD28623MUV Error Status ( DS6) ........................................................................................................... 3–7
iv EVAL-AD2437B1MZ Manual

1 Preface
Thank you for purchasing the Analog Devices, Inc. EVAL-AD2437B1MZ evaluation board.
The EVAL-AD2437B1MZ is an evaluation board to evaluate various peripherals of AD2437 A2B (Audio Bus) trans-
ceiver. Refer datasheet/manual to get more details about AD2437.
The EVAL-AD2437B1MZ is configured to be a Bus-Powered Sub (BPS) node. The EVAL-AD2437B1MZ can be
connected to a Main Node, Local-Powered Sub (LPS) or a Bus-Powered Sub (BPS) Node. These evaluation boards
are intended to be used with the SigmaStudio+ graphical development tool.
Block Diagram of Evaluation Board:
Preface
EVAL-AD2437B1MZ Manual 1–1

A PC host controls the AD2437 A2B main transceiver I2C/SPI signals over the USB-to- I2C/SPI bridge, the US-
Bi(EVAL-ADUSB2EB). This allows the PC to directly discover and control an A2B network as well as to read back
registers and monitor performance.
The SigmaStudio+®graphical development tool is the programming, development, and tuning software for the Sig-
maDSP, A2B, and Sharc processors. Familiar audio processing blocks can be wired together as in a schematic, and
the compiler generates DSP-ready code and a control surface for setting and tuning parameters. This tool allows
engineers with no DSP code writing experience to easily implement a DSP into their design and yet is still powerful
enough to satisfy the demands of experienced DSP designers. SigmaStudio+ links with both Analog Devices evalua-
tion boards and production designs to provide full in-circuit real-time IC control.
SigmaStudio+ includes an extensive library of algorithms to perform audio processing such as filtering, mixing, and
dynamics processing, as well as basic low-level DSP functions and control blocks. Advanced record-side processing
algorithms such as Enhanced Stereo Capture and wind noise detection are included in the standard libraries. Plug-in
algorithms from Analog Devices and 3rd party partners can be added to SigmaStudio+'s drag-and-drop library.
Along with its graphical DSP signal flow development, SigmaStudio+ also includes other features to speed up the
design cycle from product concept to release. SigmaStudio+ includes tools for intuitively setting control registers,
calculating tables of filter coefficients, visualizing filter magnitude and phase responses, generating C header files,
and sequencing a series of controls to ease your transition from SigmaStudio+ to system implementation on your
microcontroller.
Purpose of This Manual
This manual provides instructions for installing the product hardware (board). This manual describes the operation
and configuration of board components and provides guidelines for running code on the board.
Manual Contents
The manual consists of:
•Using the board
Provides basic board information.
•Hardware Reference
Provides information about the hardware aspects of the board.
•Bill of Materials
A companion file in PDF format that lists all of the components used on the board is available on the website
at https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/EVAL-
AD2437B1MZ.html.
•Schematic
Purpose of This Manual
1–2 EVAL-AD2437B1MZ Manual

A companion file in PDF format documenting all of the circuits used on the board is available on the website
at https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/EVAL-
AD2437B1MZ.html.
Technical Support
You can reach Analog Devices technical support in one of the following ways:
•Post your questions in the A2B support community at EngineerZone®:
http://ez.analog.com/a2b/
•Submit your questions to technical support directly at:
http://www.analog.com/support
•E-mail your questions about A2B transceiver applications and SigmaStudio+ to:
[email protected]
•Contact your Analog Devices sales office or authorized distributor. Locate one at:
http://www.analog.com/adi-sales
Supported Integrated Circuit
This evaluation system supports the Analog Devices AD2437 IC.
Supported Tools
Information about SigmaStudio+ and the A2B software plug-in for the EVAL-AD2437B1MZ evaluation board is
available at: www.analog.com/SigmaStudio+.
Product Information
Information about the AD2437 product family is available at: www.analog.com/A2B
Analog Devices Website
The Analog Devices website, http://www.analog.com, provides information about a broad range of products - ana-
log integrated circuits, amplifiers, converters, transceivers, and digital signal processors.
Also note, MyAnalog.com is a free feature of the Analog Devices website that allows customization of a web page to
display only the latest information about products you are interested in. You can choose to receive weekly e-mail
notifications containing updates to the web pages that meet your interests, including documentation errata against
all manuals. MyAnalog.com provides access to books, application notes, data sheets, code examples, and more.
Technical Support
EVAL-AD2437B1MZ Manual 1–3

Visit MyAnalog.com to sign up. If you are a registered user, just log on. Your user name is your e-mail address.
EngineerZone
EngineerZone is a technical support forum from Analog Devices, Inc. It allows you direct access to ADI technical
support engineers. You can search FAQs and technical information to get quick answers to your embedded process-
ing and DSP design questions.
Use EngineerZone to connect with other DSP developers who face similar design challenges. You can also use this
open forum to share knowledge and collaborate with the ADI support team and your peers. Visit http://
ez.analog.com to sign up.
Product Information
1–4 EVAL-AD2437B1MZ Manual

2 Using the Board
This chapter provides information on the major components and peripherals on the board, along with instructions
for installing and setting up the emulation software.
Product Overview
The board features:
•Analog Devices AD2437 - Audio Bus Transceiver
•Analog Devices ADA4661 -18 V, Precision, 725 µA, 4 MHz, CMOS RRIO Operational Amplifier
•Analog Devices ADP2360 - 50 mA, 60 V, High Efficiency Buck Regulator
•Analog DevicesLT3502/LT3502A - 1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm × 2mm DFN
and MS10
•Microchip Technology 25AA256 - 256K SPI Bus Serial EEPROM
•Infineon IM69D120 High Performance Digital MEMS Microphone
•Mouser M24512-RMN6TP - Automotive 512-Kbit Serial I2C EEPROM with 1MHz clock
•Audio
•Analog Devices ADAU1701 SigmaDSP 28-/56-Bit Audio Processor with Two ADCs and Four DACs
•BD28623MUV - Class D Speaker Amplifier
•Four Stereo MEMS Microphones
•EEPROM
•Three 3.5mm audio jacks, One input, Two output
•A2B
•Two RJ45 Shielded Terminals
•LEDs
•Six LEDs : 3.3V, 5V, Power, Error, IRQ, Bus Switch
Using the Board
EVAL-AD2437B1MZ Manual 2–1

Package Contents
Your EVAL-AD2437B1MZ package contains the following items.
•EVAL-AD2437B1MZ board
•1m RJ45 Cable
•A2B Software - Online Request Documention
Contact the vendor where you purchased your EVAL-AD2437B1MZ evaluation board or contact Analog Devices,
Inc. if any item is missing.
Default Configuration
The Default Hardware Setup figure shows the default settings for jumpers and switches and the location of the
jumpers, switches, connectors, and LEDs. Confirm that your board is in the default configuration before using the
board.
Default Config of Sub Node
Package Contents
2–2 EVAL-AD2437B1MZ Manual

P46 P47
P45 P48
DS6
P7
P20 P5
P18
P22
P1
DS4
P4
P23
P16
P2
DS3
DS2
DS5
DS1
P27 P21
Figure 2-1: Default Hardware Setup
Reference Design Information
A reference design info package is available for download on the Analog Devices Web site. The package provides
information on the schematic design, layout, fabrication, and assembly of the board.
The information can be found at:
https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/EVAL-
AD2437B1MZ.html
AD2437 - Audio Bus A2B Transceiver
Reference Design Information
EVAL-AD2437B1MZ Manual 2–3

The AD2437 provides a multi-channel, I2S/TDM link over distances of up to 30 m between nodes. It embeds bi-
directional synchronous pulse-code modulation (PCM) data (for example, digital audio), clock, and synchronization
signals onto a single differential wire pair. A2B supports a direct point to point connection and allows multiple, dai-
sy-chained nodes at different locations to contribute and/or consume time division multiplexed channel content.
A2B is a single-main, multiple-sub system where the transceiver at the host controller is the main node and generates
clock, synchronization, and framing for all sub nodes. The main A2B device is programmable over a control bus
(I2C and SPI) for configuration and read back. An extension of this control bus is embedded in the A2B data
stream, which grants direct access of registers and status information on sub transceivers as well as I2C and SPI com-
munication over distance.
The transceiver can connect directly to general-purpose digital signal processors (DSPs), field-programmable gate
arrays (FPGAs), application specific integrated circuits (ASICs), microphones, analog-to-digital converters (ADCs),
digital-to-analog converters (DACs), and codecs through a multi-channel I2S/TDM interface. It also provides a
pulse density modulation (PDM) interface for direct connection of up to four PDM digital microphones.
Finally, the transceiver also supports an A2B bus powering feature, where the main node supplies voltage and current
to the sub nodes over the same daisy-chained, twisted pair cable as used for the communication link. Please refer to
the datasheet for more details.
ADA4661 -18 V, Precision, 725 µA, 4 MHz, CMOS RRIO Opera-
tional Amplifier
The ADA4661-2 is a dual, precision, rail-to-rail input/output amplifier optimized for low power, high bandwidth,
and wide operating supply voltage range applications.
The ADA4661-2 performance is guaranteed at 3.0 V, 10 V, and 18 V power supply voltages. It is an excellent selec-
tion for applications that use single-ended supplies of 3.3 V, 5 V, 10 V, 12 V and 15 V, and dual supplies of ±2.5 V,
±3.3 V, and ±5 V. It uses the Analog Devices, Inc., patented DigiTrim® trimming technique, which achieves low
offset voltage. Additionally, the unique design architecture of the ADA4661-2 allows it to have excellent power sup-
ply rejection, common-mode rejection, and offset voltage when operating in the common-mode voltage range of
−VSY + 1.5 V to +VSY − 1.5 V.
ADAU1701 SigmaDSP 28-/56-Bit Audio Processor with Two
ADCs and Four DACs
The ADAU1701 is a complete single-chip audio system with a 28-/56-bit audio DSP, ADCs, DACs, and microcon-
troller-like control interfaces. Signal processing includes equalization, crossover, bass enhancement, multiband dy-
namics processing, delay compensation, speaker compensation, and stereo image widening. This processing can be
used to compensate for real-world limitations of speakers, amplifiers, and listening environments, providing dramat-
ic improvements in perceived audio quality.
ADA4661 -18 V, Precision, 725 µA, 4 MHz, CMOS RRIO Operational Amplifier
2–4 EVAL-AD2437B1MZ Manual

Its signal processing is comparable to that found in high end studio equipment. Most processing is done in full 56-
bit, double precision mode, resulting in very good low level signal performance. The ADAU1701 is a fully program-
mable DSP. The easy to use SigmaStudio+™ software allows the user to graphically configure a custom signal pro-
cessing flow using blocks such as biquad filters, dynamics processors, level controls, and GPIO interface controls.
ADAU1701 programs can be loaded on power-up either from a serial EEPROM through its own self-boot mecha-
nism or from an external microcontroller. On power-down, the current state of the parameters can be written back
to the EEPROM from the ADAU1701 to be recalled the next time the program is run.
Two Σ-ΔADCs and four Σ-ΔDACs provide a 98.5 dB analog input to analog output dynamic range. Each ADC
has a THD + N of −83 dB, and each DAC has a THD + N of −90 dB. Digital input and output ports allow a
seamless connection to additional ADCs and DACs. The ADAU1701 communicates through an I2C bus or a 4-
wire SPI port.
ADP2360 - 50 mA, 60 V, High Efficiency Buck Regulator
The ADP2360 is a high efficiency, high input voltage, discontinuous conduction mode (DCM) synchronous, step-
down, dc-to-dc switching regulator. The ADP2360 operates with a wide input voltage supply range from 4.5 V to
60 V and can source up to 50 mA continuous output current, making it ideal for regulating power from a variety of
voltage sources in space-constrained applications. The ADP2360 is available with an adjustable output (0.8 V to
VIN) or in 3.3 V and 5.0 V factory-programmable fixed output voltage models.
BD28623MUV - Class D Speaker Amplifier
The BD28623MUV is a Class D Speaker Amplifier designed for Flat-panel TVs in particular for space-saving and
low-power consumption. This IC delivers an output power of 20W+20W.
IM69D120 High Performance Digital MEMS Microphone
IM69D120 is a high performance digital MEMS microphone making use of Infineon's Dual Backplate MEMS
technology to deliver 95dB dynamic range and high output linearity up to 120dBSPL.
LT3502/LT3502A - 1.1MHz/2.2MHz, 500mA Step-Down Regula-
tors in 2mm × 2mm DFN and MS10
The LT3502/LT3502A are current mode PWM step-down DC/DC converters with an internal 500mA power
switch, in tiny 8-lead 2mm × 2mm DFN and 10-lead MS10 packages. The wide input voltage range of 3V to 40V
makes the LT3502/LT3502A suitable for regulating power from a wide variety of sources, including 24V industrial
supplies and automotive batteries. Its high operating frequency allows the use of tiny, low cost inductors and capaci-
tors, resulting in a very small solution. Constant frequency above the AM band avoids interfering with radio recep-
tion, making the LT3502A particularly suitable for automotive applications. Cycle-by-cycle current limit and
ADP2360 - 50 mA, 60 V, High Efficiency Buck Regulator
EVAL-AD2437B1MZ Manual 2–5

frequency foldback provide protection against shorted outputs. Soft-start and frequency foldback eliminates input
current surge during start-up. DA current sense provides further protection in fault conditions. An internal boost
diode reduces component count.
M24512-RMN6TP - Automotive 512-Kbit Serial I2C EEPROM with
1MHz clock
The M24512 is a 512-Kbit I2C-compatible EEPROM (electrically erasable programmable memory) organized as 64
K × 8 bits. The M24512-W can operate with a supply voltage from 2.5 V to 5.5 V, the M24512-R can operate with
a supply voltage from 1.8 V to 5.5 V, and the M24512-DF can operate with a supply voltage from 1.7 V to 5.5 V.
All these devices operate with a clock frequency of 1 MHz (or less), over an ambient temperature range of –40 °C /
+85 °C. The M24512-D offers an additional page, named the identification page (128 byte). The identification
page can be used to store sensitive application parameters which can be (later) permanently locked in read-only
mode.
M24512-RMN6TP - Automotive 512-Kbit Serial I2C EEPROM with 1MHz clock
2–6 EVAL-AD2437B1MZ Manual

3 Hardware Reference
This chapter describes the hardware design of the EVAL-AD2437B1MZ.
Connectors
This section describes connector functionality and provides information about mating connectors. The connector
locations are shown in the Connector Locations figure.
Hardware Reference
EVAL-AD2437B1MZ Manual 3–1

P46 P47
P45 P48
P7
P20 P5
P1
P2
P27 P21
Figure 3-1: Connector Locations
Stereo Connectors( TP5-TP8 )
TP5-TP8are used to connect stereo speakers to the board. It is not recommended that speaker impedance be lower
than 8 Ohms.
Connector Speaker Side
TP5 SPKR L-
TP6 SPKR L+
TP7 SPKR R-
TP8 SPKR R+
Connectors
3–2 EVAL-AD2437B1MZ Manual

Audio I2S Connector ( P1)
This connector has all I2S signals, it can be interfaced with external custom boards if required or used for probing.
The pinout can be found in the schematic.
SigmaStudio+ ( P2)
This connector interfaces with SigmaStudio+ through the EVAL-ADUSB2EBZ board. The connector is a 0.1"
header. The pinout can be found in the schematic.
Multipurpose pins( P5 )
For use of interfacing with the multi-purpose pins of the ADAU1701. Further information can be found in the
schematic.
ADC Input Connector( P7 )
The ADAU1701 has two Σ-ΔADCs. P7 will supply the input signal through a 3.5 mm stereo TRS connector
Part Description Manufacturer Part Number
3.5mm headphone jack CUI Devices SJ-3523-SMT
DAC Output Connector( P20 )
The ADAU1701 includes four Σ-ΔDACs. will supply output signals through a 3.5 mm TRS connector.
Part Description Manufacturer Part Number
3.5mm headphone jack CUI Devices SJ-3523-SMT
A2B ( P27 and P21)
P21 is used to connect towards a Sub Node and P27is used to connect towards the main node. These connectors
allow the AD2437 on the eval board to allow communication with other A2B devices on the bus.
Part Description Manufacturer Part Number
RJ45 - Ethernet Amphenol ICC RJE73-188-00210
Mating Cable
Ethernet cable assembly
Connectors
EVAL-AD2437B1MZ Manual 3–3

Jumpers
This section describes functionality of the configuration jumpers. The Jumper Locations figure shows the jumper
locations.
P4
P23
P16
P22
P18
Figure 3-2: Jumper Configurations
AD2437 SIO0 Routing ( P4)
The AD2437 SIO0 jumper can be configured as ADAU1701_SDATA_OUT or PDM_DATA0. The default setting
for the jumper is pins 1 and 2.
Jumper Routing
1 and 2 (DEFAULT) PDM_DATA0
Jumpers
3–4 EVAL-AD2437B1MZ Manual

Jumper Routing
2 and 3 ADAU1701_SDATA_OUT
AD2437 SIO1 Routing ( P23)
The AD2437 SIO1 jumper can be configured as BD28623_MUTEX (Mute Control for Class D Amplifier) or
PDM_DATA1. The default setting for the jumper is pins 1 and 2.
Jumper Routing
1 and 2 (DEFAULT) PDM_DATA1
2 and 3 BD28623 MUTEX
AD2437 BCLK Select ( P16)
AD2437 BCLK Jumper is used to route AD2437's BCLK to the PDM Microphones as their clock source.
Jumper Clock Routing
P16 (Shunt On) BCLK to PDM CLK (Pins 1-2)
ADAU1701 I2C Bus Switch ( P18 and P22)
These jumpers are used to close the I2C bus of the ADAU1701 and its EEPROM into the USBi and AD2437 I2C
bus.
Jumper P18 Jumper P22 ADAU1701_MP1 I2C Bus Switch
(U12 , U14)
Use Case and Action
CLOSED OPEN X CLOSED Program/Parameter write from AD2437 or USBi to ADAU1701
or Boot EEPROM
OPEN
(DEFAULT)
OPEN
(DEFAULT)
X CLOSED Program/Parameter write from AD2437 or USBi to ADAU1701
X CLOSED 1 - > 0 OPEN - > CLOSED SELFBOOT of ADAU1701 from Boot EEPROM
X X 1 OPEN Parameter write from ADAU1701 to BOOT EEPROM
LEDs
This section describes the on-board LEDs. The LED Locations figure shows the LED locations.
Jumpers
EVAL-AD2437B1MZ Manual 3–5

DS6
DS4
DS3
DS2
DS5
DS1
Figure 3-3: LED Locations
A2B Interrupt ( DS2)
The A2B interrupt LED is driven by the AD2437. The LED is turned on when the IRQ pin drives it high.
Power Status Indicator ( DS1, DS3, DS5)
The Status Indicators indicate Supplies health i.e. They will be on when the respective supply will be available on
board.
DS5 : +5.0V
DS1 : +3.3V
DS3 : Power ON
LEDs
3–6 EVAL-AD2437B1MZ Manual