Analog Devices EVAL-ADAU1850 Manual de usuario

User Guide

EVAL-ADAU1850

Evaluating the ADAU1850 Three ADCs, One DAC, Low Power Codec with Audio/

Fast DSP

Rev. A

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EVALUATION KIT CONTENTS

►EVAL-ADAU1850EBZ evaluation board

►USB cable with mini USB plug

DOCUMENTS NEEDED

►ADAU1850 data sheet

►EVAL-ADAU1850EBZ user guide

GENERAL DESCRIPTION

This user guide explains the design and setup of the EVAL-

ADAU1850EBZ evaluation board.

This evaluation board provides access to all analog and digital

inputs/outputs on the ADAU1850. The ADAU1850 core is controlled

by Analog Devices, Inc., Lark Studio™ software, which interfaces

to the EVAL-ADAU1850EBZ via a USB connection. The software

development kit (SDK) is also provided by Analog Devices for code

development.

The EVAL-ADAU1850EBZ can be powered by the USB bus or by

a single 3.8 V to 5 V supply. These supply options are regulated

to the voltages required on the EVAL-ADAU1850EBZ. The printed

circuit board (PCB) is a 4-layer design, with a ground plane and

a power plane on the inner layers. The EVAL-ADAU1850EBZ

contains connectors for external microphones and speakers. The

master clock can be generated through the internal RC oscillator in

the absence of an external clock source. It also can be provided

externally or by the on-board 24.576 MHz oscillator.

EVAL-ADAU1850EBZ BOARD PHOTOGRAPH

Figure 1.

User Guide EVAL-ADAU1850

TABLE OF CONTENTS

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Evaluation Kit Contents......................................... 1

Documents Needed...............................................1

General Description...............................................1

EVAL-ADAU1850EBZ Board Photograph............. 1

Evaluation Board Block Diagram...........................3

Setting Up the Evaluation Board........................... 4

Installing the Lark Studio Software.....................4

Installing the USB Drivers.................................. 4

Default Switch and Jumper Settings.................. 4

Master Clock Options.........................................4

Setting Up Communication in Software.................5

Powering Up the Board...................................... 5

Connecting the Audio Cables.............................5

Creating a Basic Signal Flow............................. 5

Using the Evaluation Board................................... 8

Power Supply..................................................... 8

Control Port........................................................ 8

Codec System....................................................8

Hardware Description............................................ 9

Jumpers..............................................................9

Evaluation Board Schematic............................... 10

Ordering Information............................................11

Bill of Materials................................................. 11

Notes................................................................12

REVISION HISTORY

10/2022—Rev. 0 to Rev. A

Changes to General Description Section ........................................................................................................1

Changes to Master Clock Options Section ..................................................................................................... 4

Changes to Creating a Basic Flown Section ...................................................................................................5

Changes to Clock Option Section ...................................................................................................................8

7/2021—Revision 0: Initial Version

User Guide EVAL-ADAU1850

EVALUATION BOARD BLOCK DIAGRAM

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Figure 2. EVAL-ADAU1850EBZ Board Block Diagram

User Guide EVAL-ADAU1850

SETTING UP THE EVALUATION BOARD

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INSTALLING THE LARK STUDIO SOFTWARE

Download and install the latest version of Lark Studio by completing

the following steps:

1. Download the installer, and run the executable file.

2. Follow the prompts, including accepting the license agreement,

to install the software.

INSTALLING THE USB DRIVERS

If the USB interface is not recognized by the Lark Studio software

and PC, go to the Future Technology Devices International (FTDI)

Chip official web page and download the relevant drivers.

DEFAULT SWITCH AND JUMPER SETTINGS

The JP3, JP1, JP11, and JP17 jumpers are used to set the

HPVDD_L, AVDD, and IOVDD supplies to the ADAU1850. The

external supply must be connected to P3, P7, P8, or P9.

MASTER CLOCK OPTIONS

The EVAL-ADAU1850EBZ has three options for providing a master

clock to the ADAU1850. The first option is to provide an external

master clock (MCLK) signal directly to the CLKIN pin of the codec.

The second option is to use the on-board 24.576 MHz oscillator.

The third option is to use the internal RC oscillator to generate a

master clock without an external clock source.

User Guide EVAL-ADAU1850

SETTING UP COMMUNICATION IN SOFTWARE

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POWERING UP THE BOARD

To power up the evaluation board, connect the ribbon cable to P1 of

the EVAL-ADAU1850EBZ.

CONNECTING THE AUDIO CABLES

Two channels of the microphone inputs are differential, and one

is single-ended. The headphone output is differential and is dc-cou-

pled. Digital audio signal can be I2S or TDM mode through the

serial audio interface.

CREATING A BASIC SIGNAL FLOW

To create a basic signal flow in LARK Studio, follow these steps:

1. Download Lark Studio from www.analog.com/ADAU1850 to the

desktop.

2. Start Lark Studio by double clicking the shortcut on the desktop.

3. Click New Project from the Project menu, or click Create a

New Project in the Welcome section to create a new project,

as shown in Figure 3. The New Project window shows the

Project Type options.

4. Click the Lark-Lite option for the ADAU1850 and then OK.

5. Edit the file name, and save the file to a user specified location.

6. Click Target Connection in the left navigation panel, and con-

figure the Connection settings pane that opens on the right to

set up the connection. If the USB connects, Target Connected

displays (see Figure 4).

Figure 3. Create a New Project

Figure 4. Connect with EVAL-ADAU1850EBZ

User Guide EVAL-ADAU1850

SETTING UP COMMUNICATION IN SOFTWARE

analog.com Rev. A | 6 of 12

Configure the Register Control, FastDSP, and EQ settings on the

left navigation panel. Lark-Lite Register Control has multiple tabs

that control different sections of the ADAU1850. Figure 5 shows

the Power tab, which allows the user to power up or power down

various blocks within the ADAU1850. When a block is powered up,

that block can be configured.

The Clock tab allows the PLL to be used or bypassed. By regis-

ter default, the PLL is enabled but bypassed to save power. To

generate a 24.576 MHz master clock, enable or disable the PLL

according to the provided clock source. On the evaluation board, a

24.576 MHz oscillator is supplied.

To configure an application, follow these steps:

1. Enable POWER_EN, MASTER_BLOCK_EN, and CM_START-

UP_OVER in the CHIP_PWR block in the Power tab by clicking

the OFF button to switch to ON (see Figure 5). When an

on-board 24.576 MHz oscillator is used, ensure MCLKIN_EN is

enabled in the Clock tab.

2. With the default 24.576 MHz oscillator on board, set

PLL_FM_BYPASS to PLL_FM_BP in the Clock tab.

3. Configure the other blocks.

When a register value is changed, click the related Write button in

a block to update a single register, or the Write this Page button

below the tabs to update multiple registers. Click Write All after all

Figure 5. Register Configuration

User Guide EVAL-ADAU1850

SETTING UP COMMUNICATION IN SOFTWARE

analog.com Rev. A | 7 of 12

If FastDSP is needed in the project, a schematic must be created

with the desired path for the ADAU1850.

1. Click FastDSP in the left navigation panel.

2. In the left pane of the Lark-Lite FastDSP Schematic window,

click an arrow to expand a folder.

3. Select and drag an icon into the schematic window, for exam-

ple, the ADC icon within the IO folder (see Figure 6). In

this example, AIN1 and ASRCI are being routed to FastDSP

Output 0 and Output 1.

4. To download the correct parameter generated from the sche-

matic, set fs to be the same as the FastDSP source,

FDSP_RATE_SOURCE, which is set in the FastDSP tab in

the Lark-Lite Register Control window.

5. Click Download to Target to write the parameter and command

to FastDSP memory. After the download finishes, FastDSP is

enabled and runs automatically.

If the equalizer is needed in the project, a configuration of the filters

must be set for the ADAU1850.

1. Click EQ in the navigation panel.

2. Select the filter numbers and relative filter parameters.

3. Set fs to be same as the equalizer source, EQ_ROUTE, which

is set in the EQ tab in the Lark-Lite Register Control window.

4. Click Download to Target to write the parameter and command

to equalizer memory. After the download finishes, the equalizer

is enabled and runs automatically.

For full details on the operation of Lark-Lite, click Getting Start

Guide from the Help menu of the Lark Studio GUI.

Figure 6. FastDSP Schematic Configuration

User Guide EVAL-ADAU1850

USING THE EVALUATION BOARD

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POWER SUPPLY

Power can be supplied to the EVAL-ADAU1850EBZ in one of three

ways:

►Connecting the USB cable to P1 (see Figure 2)

►Connecting a 3.8 V to 5 V dc power to P3

►Connecting an isolated external power supply to P7 for AVDD,

P8 for IOVDD, and P9 for HPVDD_L

If using a 5 V power supply, the on-board regulator generates the

1.8 V, 3.3 V, and 1.3 V dc supplies. The 1.3 V dc supply from

U1 can be adjusted by changing the values of R29 and R30. For

detailed power supply and jumpers, refer to Table 1. When using

the default SPI communication on board, the IOVDD supply can

only be jumped to 3.3 V.

Table 1. Power Supply Jumper Settings

Source Jumpers Internal External

AVDD_1850 JP1 1.8 V P7

HPVDDL_1850 JP3 1.3 V P9

IOVDD JP17 1.8 V or 3.3 V P8

IOVDD_1850 JP11 from IOVDD JP11 from IOVDD JP11 from IOVDD

CONTROL PORT

The EVAL-ADAU1850EBZ is configured to SPI mode by default.

To operate the codec in I2C or universal asynchronous receiv-

er/transmitter (UART) mode, R10 to R14 are recommended to be

uninstalled. By default, these resistors are connected. For detailed

connection and jumpers on P2 and JP16, refer to Table 2.

Table 2. Control Port Settings

P2 Pin Name

Test

Point

JP16

Pull-Up

JP16

Pull- Down

1 SCL/SCLK TP16 Pin 1 and Pin 2 Pin 2 and Pin 3

3 ADDR1/MOSI/RX TP17 Pin 4 and Pin 5 Pin 5 and Pin 6

5 SDA/MISO/TX TP18 Pin 7 and Pin 8 Pin 8 and Pin 9

7 ADDR0/SS TP19 Pin 10 and Pin 11 Pin 11 and Pin 12

CODEC SYSTEM

Clock Option

The EVAL-ADAU1850EBZ has three options for providing a master

clock to the ADAU1850. The first option is to provide an external

MCLK signal directly to the CLKIN pin of the codec from P16 and

disable the on-board oscillator by placing a jumper on Header JP2.

The second option is to use the on-board 24.576 MHz oscillator.

These two options can be chosen through JP7. The third option is

to use the internal RC oscillator to generate a master clock where

JP2 needs to be jumped to disable the on-board oscillator.

Power-Down

The EVAL-ADAU1850EBZ can power down all analog and digital

circuits of the codec in two ways: pressing the S1 button or placing

a jumper on the JP10 header.

Inputs and Outputs

The EVAL-ADAU1850EBZ has multiple audio input and output

options, including digital and analog. Three analog inputs are con-

figurable as microphone or line inputs. Two of these analog inputs

are differential or single-ended, and one is only single-ended. One

differential output can also be used in headphone or line output

mode.

For microphone signals, the two differential (ADC0 and ADC1)

ADAU1850 analog inputs can be configured as single-ended inputs

with an optional programmable gain amplifier (PGA) mode. But

the ADC2 can only be single-ended with an optional PGA mode.

The headphone output can be set as a line output driver or as a

headphone driver. In line output mode, the typical load is 10 kΩ. In

headphone output mode, the typical load is 16 Ω to 32 Ω.

Serial Audio Interface

Serial audio signals in I2S, left justified, right justified, or time divi-

sion multiplexed (TDM) format are available via the P10 serial audio

interface header to connect an external I2S- or TDM-compatible

device. The IOVDD logic level is 1.8 V or 3.3 V.

User Guide EVAL-ADAU1850

HARDWARE DESCRIPTION

analog.com Rev. A | 9 of 12

JUMPERS

Table 3. Connector and Jack Descriptions

Reference

Designator Function Description

P1 USB interface USB 5 V power and communication with Lark Studio

P2 Control port Allow three ways of communication: SPI, I2C, and UART

P3 External 5 V External 5 V source

P4 Analog Input 0 Default differential input 3.5 mm jack

P5 Analog Input 1 Default differential input 3.5 mm jack

P6 Analog Input 2 Single-ended input 3.5 mm jack

P7 External AVDD AVDD power from external source

P8 External IOVDD IOVDD power from external source

P9 External HPVDDL HPVDD_L power from external source

P10 Serial data port Input and output header for serial audio signals

P11 Analog Output Differential output

P12 Analog Input 0 Default differential input pins connection

P13 Analog Input 1 Default differential input pins connection

P14 Analog Input 2 Single ended input pins connection

P15 Analog output Differential output pins connection

P16 External clock Master clock from external source

P17 IRQ/MCLKO pull-up Select IRQ or master clock output pull-up

JP1 Internal/external AVDD select Used to select the external AVDD source or on-board regulator for AVDD

JP2 Disable oscillator Used to disable on-board oscillator

JP3 Internal/external HPVDD_L select Used to select the external HPVDD_L source or on-board regulator for HPVDD_L.

JP7 Internal/external MCLK select Used to select the external source or oscillator

JP10 Power-down Used to enter power-down mode

JP11 IOVDD_1850 Used to provide IOVDD source to the ADAU1850

JP12 IRQ pull-up Used to pull up IRQ pin

JP13 MCLKO pull-up Used to pull up CLKOUT/IRQ pin

JP16 Control port pull-up/down select Used to pull up or pull down control pins (SCL/SCLK, SDA/MISO/TX, ADDR1/

MOSI/RX, and ADDR0/SS)

JP17 Internal/external IOVDD select Used to select the external IOVDD source or on-board regulator for IOVDD

User Guide EVAL-ADAU1850

EVALUATION BOARD SCHEMATIC

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Figure 7. Evaluation Board Schematic

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