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_______________________________________________________________ Maxim Integrated Products 1

MAX9880A Evaluation Kit

Evaluates: MAX9880A

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

General Description

The MAX9880A evaluation kit (EV kit) is a fully assem-

bled and tested surface-mount PCB that evaluates the

MAX9880A IC, which is a low-power, high-performance,

stereo audio codec with audio processing. To facilitate

evaluation, the EV kit includes input and output RCA

connections, capless and single-ended headphone con-

nectors (J3, J4), and two on-board digital microphones

(U15, U16).

Integrated into the EV kit design is a digital audio trans-

ceiver (U11) and a USB stereo audio DAC (U12). The

digital audio transceiver provides audio input and output

through the on-board TOSLINK connectors (J5, J6)

and the USB stereo audio DAC provides audio input

through the mini-USB connector (J10).

The device’s I

C/2-wire and SPIK control bus are inter-

faced to the on-board MAXQ2000 microcontroller, allow-

ing for evaluation with the EV kit software.

Features

S USB Powered

S Configurable I

C/2-Wire or SPI Interface

S USB, TOSLINK, and RCA Audio Input

Connections

S 3.5mm, TOSLINK, and RCA Audio Output

Connections

S Windows

2000-, Windows XP

and Windows

Vista

(32-Bit)-Compatible Software

S Surface-Mount Components

S Proven PCB Layout

S Fully Assembled and Tested

Ordering Information

Component List

19-5325; Rev 1; 5/11

#Denotes RoHS compliant.

SPI is a trademark of Motorola, Inc.

Windows, Windows XP, and Windows Vista are registered

trademarks of Microsoft Corp.

PART TYPE

MAX9880AEVKIT# EV Kit

DESIGNATION QTY DESCRIPTION

CLK, DATA 0

Not installed, miniature test

points

C1–C9, C12–

C17, C23–C26,

C33, C43, C50,

C53, C54, C67,

C68, C71,

C77–C86, C92,

C93

1FF Q10%, 10V X5R ceramic

capacitors (0402)

Murata GRM155R61A105K

C10 1

2.2FF Q20%, 6.3V X5R ceramic

capacitor (0402)

Murata GRM155R60J225M

Taiyo Yuden JMK105BJ225MV-F

C11, C18 2

220FF Q20%, 4V tantalum

capacitors (S case)

Nichicon F950G227MSAAM1Q2

C19, C20, C31,

C32, C57

0.01FF Q10%, 25V X7R ceramic

capacitors (0402)

Murata GRM155R71E103K

DESIGNATION QTY DESCRIPTION

C21, C22, C27,

C29, C35, C40,

C42, C44–C47,

C51, C55, C56,

C69, C75, C76

0.1FF Q10%, 6.3V X5R ceramic

capacitors (0402)

Murata GRM155R60J104K

C28 1

4700pF Q10%, 25V X7R ceramic

capacitor (0603)

Murata GRM188R71E473K

TDK C1608X7R1E473K

C30 1

0.47FF Q10%, 6.3V X5R

ceramic capacitor (0603)

Murata GRM188R60J474K

TDK C1608X5R0J474K

C34, C36, C37,

C41, C73, C74

8pF Q0.5pF, 50V C0G ceramic

capacitors (0402)

Murata GRM1555C1H8R0D

Taiyo Yuden UMK105CH080DV

C38, C58–C65,

C87–C90

Not installed, ceramic

capacitors (0402)

Summary of content (37 pages)

PAGE 1
9-5325; Rev 1; 5/11 MAX9880A Evaluation Kit The MAX9880A evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that evaluates the MAX9880A IC, which is a low-power, high-performance, stereo audio codec with audio processing. To facilitate evaluation, the EV kit includes input and output RCA connections, capless and single-ended headphone connectors (J3, J4), and two on-board digital microphones (U15, U16).
PAGE 2
Evaluates: MAX9880A MAX9880A Evaluation Kit Component List (continued) DESIGNATION C39 C48, C49 C52, C70, C91 C66, C72 QTY 1 DESCRIPTION 33000pF Q10%, 16V X7R ceramic capacitor (0603) Murata GRM188R71C333K 2 18pF Q5%, 50V C0G ceramic capacitors (0603) Murata GRM1885C1H180J TDK C1608C0G1H180J 3 10FF Q10%, 6.3V X5R ceramic capacitors (0805) Murata GRM219R60J106K 2 47FF Q20%, 6.
PAGE 3
MAX9880A Evaluation Kit DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION U10 1 2.5V low-noise linear regulator (5 SC70) Maxim MAX8511EXK25+ (Top Mark: ADV) Y1 1 12.288MHz crystal (3.2mm x 2.5mm) Kyocera CX3225SB12288D0FLJZ1 U11 1 Digital audio transceiver (28 SO) Cirrus CS8427-CSZ Y2 1 13MHz crystal oscillator (2.5mm x 2mm) ECS Inc. ECS-2033-130-BN U12 1 USB audio codec (32 QFP) Texas Instruments PCM2707PJT Y3 1 16MHz crystal oscillator (3.2mm x 2.
PAGE 4
Evaluates: MAX9880A MAX9880A Evaluation Kit Quick Start Required Equipment • MAX9880A EV kit (USB cable included) • Audio source with mini-USB connection • Headphones and/or a speaker • Windows 2000, Windows XP, or Windows Vista PC with a spare USB port Note: In the following sections, software-related items are identified by bolding. Text in bold refers to items directly from the EV kit software. Text in bold and underlined refers to items from the Windows operating system.
PAGE 5
MAX9880A Evaluation Kit Evaluates: MAX9880A Figure 1.
PAGE 6
Evaluates: MAX9880A MAX9880A Evaluation Kit Detailed Description of Software The MAX9880A EV kit software is divided into three tabs: Analog Audio, Digital Audio, and Control Registers. The analog and digital tabs are image-based tabs, providing a visualization of the MAX9880A’s (U1) configuration and an interpretation of the register organization. The control tab provides a map of the device registers, as well as configuration control of each register bit.
PAGE 7
MAX9880A Evaluation Kit some of the different GUI images, aside from the various rectangular blocks, that are used to access device registers. In most cases, selecting an image brings up a secondary window that provides controls for configuring the device. When making register changes, the block’s color changes from gray to blue when that signal path has been properly configured and activated.
PAGE 8
Evaluates: MAX9880A MAX9880A Evaluation Kit Figure 4.
PAGE 9
MAX9880A Evaluation Kit The edit boxes are used to display a register’s current state and are updated after a read all, bit click, or con- figuration change has been made on the Analog Audio and Digital Audio tabs. The edit boxes can also be used to configure the device registers. This is accomplished by entering the desired 8-bit hex value (0x??) into the edit box and then pressing the Enter key. Note: the register addresses provided on the Control Registers tab are for I2C.
PAGE 10
Evaluates: MAX9880A MAX9880A Evaluation Kit Table 4. S/PDIF Transceiver Window Controls CONTROL DESCRIPTION Enable SPDIF checkbox Enables autoconfiguration of the CS8427 digital audio transceiver (U11). Autoconfigure CODEC checkbox When checked, it enables auto configuration of the U1 device. When not checked, the U1 device must be manually configured.
PAGE 11
MAX9880A Evaluation Kit Interrupt Enables Hardware interrupts are enabled/disabled by setting/ clearing the interrupt item listed under the Options | Interrupt Enables menu item. In order for a status register flag to be reported on the device’s open-drain IRQ pin, the corresponding interrupt enable bit must be set. Otherwise, the flag is only reported as a software interrupt in the Status group box.
PAGE 12
Evaluates: MAX9880A MAX9880A Evaluation Kit Digital Audio Interface 1 - Basic This window provides basic controls for configuring the digital audio interfaces. In this window, when making configuration changes, the Configure button must be pressed for the settings to be applied to the device. See Table 8 for a description of the controls on the interface’s basic window shown in Figure 8.
PAGE 13
MAX9880A Evaluation Kit Evaluates: MAX9880A Figure 9. Digital Audio Interface 1 - Advanced Window Figure 10.
PAGE 14
Evaluates: MAX9880A MAX9880A Evaluation Kit paths is accessed by selecting either of its Filtering blocks and filtering for the DAI2 signal path is enabled/ disabled by clicking its associated Filtering block. The DAI1 Filtering blocks open the DAI1 Filtering window. The Filtering Mode radio buttons configure the filtering mode for DAI1’s DAC and ADC signals.
PAGE 15
MAX9880A Evaluation Kit used to configure the Left Volume Control and Right Volume Control registers (see Figure 13). These registers control the mute and playback volume settings for both the DAC and line input audio signals. As such, this window is also accessible from the Digital Audio tab by selecting the gain blocks going into the DAI_ DAC Filtering blocks.
PAGE 16
Evaluates: MAX9880A MAX9880A Evaluation Kit Line Output Registers The mute and gain settings for the line outputs (LOUTL, LOUTR) are accessed by selecting the outputs’ gain block. The gain blocks open the Left Line Output Gain and Right Line Output Gain windows, each of which provides controls to mute and configure the gain of that line output. See Figure 14 for the Left Line Output Gain window.
PAGE 17
MAX9880A Evaluation Kit Audio Input Mixers The left and right input mixers can be configured to mix audio signals from the analog microphones, singleended line inputs, or a combination of both inputs. If an input mixer is configured to mix the right line input and the right line input is disabled, then the left line input is routed to both mixers. This logic is reflected by the input labels displayed on the ADC MIX blocks.
PAGE 18
Evaluates: MAX9880A MAX9880A Evaluation Kit The two top group boxes (Setup and Calibration) represent the procedures for properly configuring the ADC for performing DC voltage measurements. The first time this window is opened, the Calibration and Voltage Measurement group boxes are disabled. This is intentional and ensures that the ADC gets properly configured before the first DC measurement is taken. Refer to the ADC section in the MAX9880A IC data sheet for detailed steps for configuring the device.
PAGE 19
MAX9880A Evaluation Kit The left and right DAC and ADC enables are accessed by selecting the DAC and ADC blocks available on both the Analog Audio and Digital Audio tabs. Note that when enabling the right DAC/ADC, the left DAC/ADC should also be enabled. System Shutdown Register The register’s SHDN bit is used to place the device in a lower-power shutdown mode. This feature is controlled by the MAX9880A Power button at the top of the main software window.
PAGE 20
Evaluates: MAX9880A MAX9880A Evaluation Kit Save/Load Settings Register configurations can be saved/loaded by selecting the Save Settings CTRL+S or Load Settings CTRL+O menu item from the File menu bar. The save operation saves the state of the U1 device registers, S/PDIF transceiver (U11) registers, and a few generalpurpose input-output (GPIO) settings to a configuration file.
PAGE 21
MAX9880A Evaluation Kit MAXQ2000 GPIO NET NAME I/O K1 9880A_IRQ Input K2 Output K3 CS2 CONNECT Used to monitor the U1 device’s IRQ pin. Chip select for U1 device’s SPI interface. FUNCTIONALITY Output Enables/disables PC detection of the USB audio DAC (U12). K4 CS8427_RST Output Controls the RST pin of the digital audio interface transceiver (U11). K5 9880A_SELECT Input Used to poll the U1 device’s SELECT pin. Figure 18.
PAGE 22
Evaluates: MAX9880A MAX9880A Evaluation Kit SPI Interface The SPI interface is configured and used by selecting the 3-wire Interface tab. The Connection and Configuration group boxes are used to configure the SPI interface. The EV kit’s SPI connections and default interface configuration are shown in Table 13 and Figure 20, respectively. The SPI interface can be used to read and write to the U1 and U11 devices.
PAGE 23
MAX9880A Evaluation Kit The MAX9880A EV kit evaluates the MAX9880A lowpower, high-performance, stereo audio codec with audio processing (U1). The EV kit includes input and output RCA connections, capless and single-ended headphone connectors (J3, J4), and two on-board digital microphones (U15, U16). The EV kit also includes USBpowered low-dropout (LDO) linear regulators that allow the EV kit to be evaluated without any external supplies. These LDOs provide the 1.8V and 3.
PAGE 24
Evaluates: MAX9880A MAX9880A Evaluation Kit Master Clock (MCLK) Microphone Inputs The EV kit provides jumper JU12 to select the source of the device’s master clock input (see Table 14). The MCLK input can be connected to GND, RMCK, FUNC2, or the on-board 13MHz crystal oscillator (Y2). When connected to RMCK or FUNC2, the clock signal is provided by the digital audio transceiver or the USB stereo audio DAC, respectively. The U1 device can be evaluated with digital microphones and/or analog microphones.
PAGE 25
MAX9880A Evaluation Kit To access the SPDM output signals, shunts must be installed on jumpers JU18 and JU24. This configuration connects the SPDM output (SPDMDATA, SPDMCLK) to the DSD_DATA and DSD_CLK pads. JACKSNS/AUX The U1 device’s JACKSNS/AUX pin has dual functionality, allowing it to be used as an input for jack detection, or as an input for measuring DC voltages.
PAGE 26
Evaluates: MAX9880A MAX9880A Evaluation Kit Measuring DC Voltages (AUX) To utilize this feature, configure jumper JU7 according to Table 19, remove the shunt from jumper JU29, ensure that a headphone plug is not plugged in to jumper JU3, and enable the AUX block on the Analog Audio tab, and refer to the ADC section in the MAX9880A IC data sheet for setup and configuration details. The applied DC voltage (VAUX) is divided down before measured by the device’s ADC.
PAGE 27
MAX9880A Evaluation Kit Digital Audio Transceiver (U11) The digital audio transceiver connects to TOSLINK connectors J5 and J6 for audio input and output. The device is operated in software mode (HS pin tied low) and is connected to the U1 device’s S1 digital audio interface. The audio transceiver is also interfaced to the EV kit’s SPI control bus and is selected by the CS1 chip select line. See the S/PDIF Audio section.
PAGE 28
Evaluates: MAX9880A MAX9880A Evaluation Kit Figure 21a.
PAGE 29
MAX9880A Evaluation Kit Evaluates: MAX9880A Figure 21b.
PAGE 30
Evaluates: MAX9880A MAX9880A Evaluation Kit Figure 21c.
PAGE 31
MAX9880A Evaluation Kit Evaluates: MAX9880A Figure 21d.
PAGE 32
Evaluates: MAX9880A MAX9880A Evaluation Kit Figure 21e.
PAGE 33
MAX9880A Evaluation Kit Evaluates: MAX9880A Figure 21f.
PAGE 34
Evaluates: MAX9880A MAX9880A Evaluation Kit Figure 21g.
PAGE 35
MAX9880A Evaluation Kit Evaluates: MAX9880A 1.0’’ 1.0” Figure 22. MAX9880A EV Kit Component Placement Guide— Component Side Figure 24. MAX9880A EV Kit PCB Layout—Layer 2 1.0’’ Figure 23. MAX9880A EV Kit PCB Layout—Component Side 1.0’’ Figure 25.
PAGE 36
Evaluates: MAX9880A MAX9880A Evaluation Kit 1.0’’ Figure 26. MAX9880A EV Kit PCB Layout—Layer 4 1.0’’ Figure 27. MAX9880A EV Kit PCB Layout—Layer 5 1.0’’ Figure 28.
PAGE 37
MAX9880A Evaluation Kit REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 1 9/10 Initial release 5/11 Replaced obsolete components U15 and U16 3, 5, 28, 35 — Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.