MAX9789AEVKIT+ [MAXIM]

Integrated 120mA Low-Dropout Linear Regulator;


型号：	MAX9789AEVKIT+
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Integrated 120mA Low-Dropout Linear Regulator
文件：	总8页 (文件大小：289K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-0591; Rev 1; 11/06

MAX9789A Evaluation Kit

General Description

Features

The MAX9789A evaluation kit (EV kit) is a fully assem-

bled and tested circuit board that evaluates the

MAX9789A IC. The MAX9789A combines a stereo 2W

Class AB speaker power amplifier, a stereo 85mW

DirectDrive™ headphone amplifier, and a 120mA low-

dropout (LDO) linear regulator in a single device. The

MAX9789A is designed for use with the Windows

Vista™ operating system and is fully compliant with

Microsoft’s premium mobile Vista specifications.

♦ Windows Premium Mobile Vista Compliant

♦ 2W Stereo Class AB BTL Speaker Amplifier

♦ Stereo 100mW DirectDrive Headphone Amplifier

♦ Integrated 120mA Low-Dropout Linear Regulator

♦ Fully Assembled and Tested

♦ Evaluates the MAX9790A (Replacement IC

The speaker amplifier operates from a 4.5V to 5.5V DC

power supply and delivers 2 x 2W output power into a

pair of 4Ω speakers. The headphone amplifier operates

from a 3.0V to 5.5V DC power supply and delivers

100mW output power into a 16Ω stereo headphone.

Required)

Ordering Information

The MAX9789A provides separate stereo speaker and

headphone amplifier inputs. Control pins provide inde-

pendent shutdown of the speaker and headphone

amplifiers, allowing speaker and headphone amplifiers

to reproduce separate audio streams simultaneously.

PART

TEMP RANGE

IC PACKAGE

MAX9789AEVKIT+

0°C to +70°C*

32 TQFN-EP**

*This limited temperature range is for the EV kit PC board only.

The MAX9789A IC temperature range is -40°C to +85°C.

The MAX9789A features an internal 120mA LDO. The

LDO output voltage is internally set at 4.75V, or can be

externally adjusted between 1.21V and 4.75V using a

simple resistor-divider. The LDO can be enabled inde-

pendently of the audio amplifiers.

**EP = Exposed paddle.

+Denotes a lead-free and RoHS-compliant EV kit.

The MAX9789A EV kit can be used to evaluate the

MAX9790A. See the Evaluating the MAX9790A section

for more details.

Windows Vista is a trademark of Microsoft Corp.

Component List

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

REQUIRED COMPONENTS

MAX9789AETJ+

(32-pin TQFN, 5mm x 5mm x 0.8mm)

MAX9789A EV kit PCB

—

1.0µF 10ꢀ, 6.3V X5R ceramic

capacitors (0402)

C1, C2, C3, C9,

C11–C14

TDK C1005X5R0J105K

OPTIONAL COMPONENTS

10µF 20ꢀ, 6.3V X5R ceramic

capacitor (0805)

TDK C2012X5R0J106M

Not installed, ceramic capacitor

(0402)

C19

C5, C6

J1–J4, J6, J7,

1.0µF 10ꢀ, 10V X7R ceramic

capacitors (0603)

3-pin headers

—

2-pin header

TDK C1608X7R1A105K

3.5mm stereo jack

47kΩ 1ꢀ resistor (0402)

27kΩ 1ꢀ resistor (0402)

Shunts

1.0µF 10ꢀ, 25V X7R ceramic

capacitors (1206)

C7, C8

TDK C3216X7R1E105K

0.1µF 10ꢀ, 10V X5R ceramic

capacitors (0402)

TDK C1005X5R1A104K

C10, C15, C17

C16*, C18*

*System-level requirement.

+Denotes lead-free package.

33µF 20ꢀ, 6.3V X5R ceramic

capacitors (1206)

TDK C3216X5R0J336M

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX9789A Evaluation Kit

13) Connect the second audio source to the HP_INL

and the HP_INR pads. Connect the audio source

ground to the SGND pad.

Quick Start

Recommended Equipment

• One 5V, 2A power supply

14) Turn on the power supply and both audio sources.

• Two audio sources

• Stereo speakers

Detailed Description

The MAX9789A EV kit is designed to evaluate the

MAX9789A IC. The MAX9789A combines a stereo 2W

Class AB speaker power amplifier, a stereo 100mW

DirectDrive headphone amplifier, and a 120mA low-

dropout linear regulator in a single device. The

MAX9789A is designed for use with the Windows Vista

operating system and is fully compliant with Microsoft’s

premium mobile Vista specifications.

• One stereo headphone

The MAX9789A EV kit is fully assembled and tested.

Follow the steps listed below to verify board operation.

Do not turn on the power supply until all connec-

tions are completed.

1) Verify that a shunt is installed across pins 1 and 2 of

jumper J1 (LDO_EN = VDD, LDO enabled).

The speaker amplifier operates from a 4.5V to 5.5V DC

power supply and delivers 2 x 2W output power into a

pair of 4Ω speakers from an independent input port.

The headphone amplifier operates from a 3.0V to 5.5V

DC power supply and delivers 100mW power into 16Ω

stereo headphones from an independent input port.

The EV kit can be powered by a single 4.5V to 5.5V DC

power supply if desired.

2) Verify that a shunt is installed across pins 2 and 3 of

jumper J2 (LDO_SET = GND, LDO_OUT = 4.75V).

3) Verify that shunts are installed across pins 1 and 2

of jumper J3 and pins 2 and 3 of jumper J4 (GAIN2

= VDD, GAIN1 = GND, SPKR gain = 10dB).

4) Verify that a shunt is installed across jumper J5

(HPVDD = VDD).

5) Verify that a shunt is installed across pins 1 and 2 of

The MAX9789A provides separate stereo speaker and

headphone amplifier inputs. Control pins provide inde-

pendent shutdown of the speaker and headphone

amplifiers, allowing speaker and headphone amplifiers

to reproduce separate audio streams simultaneously.

jumper J6 (MUTE = VDD, MUTE disabled).

6) Verify that a shunt is installed across pins 2 and 3 of

jumper J7 (SPKR_EN = GND, SPKR enabled).

7) Verify that a shunt is installed across pins 1 and 2 of

jumper J8 (HP_EN = VDD, enabled).

The speaker amplifier gain of the MAX9789A is selec-

table by jumpers J3 and J4. The MAX9789A also fea-

tures a 120mA, fixed 4.75V or adjustable 1.21V to

4.75V, low-dropout linear regulator.

8) Connect the first speaker to the OUTL+ and the

OUTL- pads.

9) Connect the second speaker to the OUTR+ and the

OUTR- pads.

The EV kit is shipped with the MAX9789AETJ+ installed.

The EV kit can also evaluate the MAX9790A. To evaluate

the MAX9790A, see the Evaluating the MAX9790A sec-

tion for additional information.

10) Insert a pair of headphones to jack J9.

11) Connect the ground terminal of the power supply to

the GND pad. Connect the +5V power supply to the

VDD pad.

12) Connect the first audio source to the SPKR_INL and

the SPKR_INR pads. Connect the audio source

ground to the SGND pad.

Component Supplier

SUPPLIER

PHONE

FAX

WEBSITE

TDK

847-803-6100

847-390-4405

www.component.tdk.com

Note: Indicate that you are using the MAX9789A/MAX9790A when contacting this component supplier.

_______________________________________________________________________________________

MAX9789A Evaluation Kit

Gain Control (J3 and J4)

Jumpers J3 and J4 set the speaker amplifier gain on

the EV kit. See Table 4 for shunt positions.

Jumper Selection

Shutdown Control (J1, J7, and J8)

Jumpers J7 and J8 control the independent shutdown

pins (SPKR_EN and HP_EN, respectively) of the speak-

er and headphone amplifiers. See Table 1 for shunt

positions.

Table 4. J3 and J4 Jumper Selection

SPEAKER

AMPLIFIER AMPLIFIER GAIN**

GAIN (dB)

HEADPHONE

J3 SHUNT J4 SHUNT

POSITION POSITION

(dB)

Table 1. J7 and J8 Jumper Selection

2-3

2-3*

1-2

2-3

1-2*

2-3

1-2

3.5

EV KIT FUNCTION

J7 SHUNT

POSITION

J8 SHUNT

POSITION

SPKR

Disabled

Enabled

Disabled

Enabled

Disabled

Enabled

15.6

21.6

1-2

2-3

1-2

2-3

*Default setting.

**Headphone amplifier gain is fixed at 3.5dB.

2-3

2-3*

1-2*

*Default setting.

Power-Supply Control (J5)

Jumper J5 connects VDD to HPVDD. See Table 5 for

shunt positions.

Jumper J1 enables/disables the linear regulator. See

Table 2 for shunt positions.

Table 5. J5 Jumper Selection

Table 2. J1 Jumper Selection

J5 SHUNT POSITION

EV KIT FUNCTION

VDD = HPVDD

Installed*

J1 SHUNT POSITION

EV KIT FUNCTION

LDO enabled

LDO disabled

Provide a separate, external 3.0V to

5.5V potential between HPVDD and

GND

1-2*

2-3

Not installed

*Default setting.

Mute Control (J6)

Low-Dropout Linear Regulator (J1 and J2)

Jumper J1 enables/disables the linear regulator. See

Table 6 for shunt positions.

Jumper J6 controls the mute pin (MUTE) of the speaker

and headphone amplifiers. See Table 3 for shunt positions.

Jumper J2 connects the regulator’s feedback input

(LDO_SET) to either GND or the resistor-divider R1/R2.

Table 3. J6 Jumper Selection

J6 SHUNT POSITION

EV KIT FUNCTION

SPKR and HP unmuted

SPKR and HP muted

Table 6. J1 Jumper Selection

1-2*

2-3

J1 SHUNT POSITION

EV KIT FUNCTION

LDO enabled

LDO disabled

*Default setting.

1-2*

2-3

*Default setting.

_______________________________________________________________________________________

MAX9789A Evaluation Kit

capacitance, and the wiring capacitance. This capacitor

creates a zero in the feedback loop to reduce over-

shoot. Select C19 in the 10pF range when R1 is greater

than 100kΩ. Overcompensation can cause poor stability

in the high output current range.

Table 7. J2 Jumper Selection

J2 SHUNT POSITION

EV KIT FUNCTION

The regulator’s feedback input

(LDO_SET) is connected to

resistor-divider R1/R2.

Note: The resistors installed on the

EV kit set the output voltage to

3.3V.

1-2

Evaluating the MAX9790A

The regulator’s feedback input

(LDO_SET) is connected to GND.

The output voltage is 4.75V.

2-3*

LDO_OUT

TO CODEC

47kΩ

C19

OPEN

C11

1µF

C12

1µF

*Default setting.

MAX9789A

See Table 7 for shunt positions.

LDO_SET

The resistors installed on the MAX9789A EV kit set the

output voltage to 3.3V. To change this voltage, replace

R1 and R2. Use the following equation to select resistor

values:

27kΩ

GND

⎛

⎞

= V

⎜

⎝

⎟

⎠

LDO_OUT

LDO_SET

Figure 1. Adjustable Output Using External Feedback Resistors

where V

= 1.21V.

LDO_SET

To simplify resistor selection:

The MAX9790A combines a stereo 2W Class AB

speaker power amplifier with a stereo 100mW

DirectDrive headphone amplifier only. To evaluate the

MAX9790A, replace the MAX9789A with the

MAX9790A. Ensure a shunt is installed across pins 2

and 3 of jumper J1 before operating the device. Do not

install a shunt at jumper J2. Follow the MAX9789A

quick start instructions with the exception of steps 1

and 2.

⎛

⎞

LDO_OUT

R1=R2

−1

⎟

⎜

1.21

⎝

⎠

To minimize the current consumption, select resistor

values between 10kΩ and 1MΩ.

Capacitor C19 (see Figure 1) can be used to compen-

sate the input capacitance at LDO_SET, the stray

_______________________________________________________________________________________

MAX9789A Evaluation Kit

VDD

GND

C18

33µF

C17

0.1µF

C15

C16

33µF

CPGND

PGND

0.1µF

PGND

1.0µF

SPKR_INL

SPKR_INR

SPKR_INL

OUTL+

OUTL-

1.0µF

SPKR_INR

BIAS

1.0µF

OUTR+

OUTR-

HP_INL

1.0µF

HP_INR

MUTE

MAX9789A

HP_INR

MUTE

VDD

HPL

HPR

VDD

SPKR_EN

VDD

HP_EN

GAIN2

VDD

HPVDD

VDD

HPV

CPV

GAIN1

10µF

VDD

LDO_EN

1µF

CPGND

C1P

VDD

C12

1.0µF

C11

1.0µF

C10

0.1µF

1.0µF

CPGND

C1N

LDO_OUT

CPGND

LDO_OUT

LDO_SET

C13

1.0µF

C14

1.0µF

47kΩ

C19

OPEN

CPV

GND

PGND

5, 21

27kΩ

1.0µF

PGND

SGND

CPGND

Figure 2. MAX9789A EV Kit Schematic

_______________________________________________________________________________________

MAX9789A Evaluation Kit

VDD

GND

C18

33µF

C17

0.1µF

C15

C16

33µF

CPGND

PGND

0.1µF

PGND

1.0µF

SPKR_INL

SPKR_INR

SPKR_INL

OUTL+

OUTL-

1.0µF

SPKR_INR

BIAS

1.0µF

HP_INL

OUTR+

OUTR-

HP_INL

1.0µF

HP_INR

MUTE

MAX9790A

HP_INR

MUTE

VDD

HPL

HPR

VDD

SPKR_EN

VDD

HP_EN

GAIN2

VDD

HPVDD

VDD

GAIN1

GND

HPV

CPV

VDD

10µF

1µF

CPGND

VDD

C1P

C12

1.0µF

C11

1.0µF

C10

0.1µF

1.0µF

CPGND

C1N

LDO_OUT

N.C.

CPGND

C13

1.0µF

C14

1.0µF

47kΩ

C19

OPEN

CPV

GND

PGND

5, 21

27kΩ

1.0µF

PGND

SGND

CPGND

Figure 3. MAX9790A Evaluation Schematic

Note: When evaluating the MAX9790A, ensure a shunt is installed across pins 2 and 3 of jumper J1 before operating

the device. Do not install a shunt at jumper J2.

_______________________________________________________________________________________

MAX9789A Evaluation Kit

Figure 4. MAX9789A EV Kit Component Placement Guide—

Silkscreen

Figure 5. MAX9789A EV Kit PCB Layout—Component Side

Figure 6. MAX9789A EV Kit PCB Layout—Layer 2

Figure 7. MAX9789A EV Kit PCB Layout—Layer 3

_______________________________________________________________________________________

MAX9789A Evaluation Kit

Figure 8. MAX9789A EV Kit PCB Layout—Solder Side

Revision History

Pages changed at Rev 1: 1, 7, 8

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.

8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

is a registered trademark of Maxim Integrated Products, Inc.

Boblet

MAX9789AEVKIT+ [MAXIM]

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