Rainbow Electronics MAX9892 User Manual

General Description

The MAX9892 is an audio click-and-pop eliminator for
portable multimedia devices. Operating from a 1.7V to

3.6V supply, the MAX9892 connects to the output of the
existing system amplifier and provides a low-imped­ance path to ground during startup and shutdown. The
inputs INL and INR accept voltage swings from V

DD

to

5.5V below V

DD

. See the

Setting the Supply Voltage

section for more information. The power-up and power­down transients are shunted to ground to prevent clicks
and pops from becoming audible.

The MAX9892 features two low-impedance analog
switches controlled by MUTE that opens and closes the
switches. The switches are open during normal opera­tion and have no impact on the output signal. During
startup and shutdown of the amplifier, the MAX9892
can be activated to short the outputs to ground and
prevent clicks and pops from pulling current through
the headphones.

The MAX9892 is available in 6-bump UCSP (1mm x

1.52mm x 0.6mm) and 6-pin µDFN (2mm x 2mm x

0.75mm) packages. The MAX9892 is specified over the

-40°C to +85°C temperature range.

Applications

Mobile Phones

Smart Phones

Mobile Internet Devices

Portable Gaming Consoles

Portable Media Players

Notebook Computers

Features

♦ Distortion-Free, Click-and-Pop Elimination

♦ Less than 1µA Supply Current

♦ 1.7V to 3.6V Single-Supply Operation

♦ Tiny Packages

6-Bump UCSP (1mm x 1.52mm x 0.6mm)
6-Pin µDFN (2mm x 2mm x 0.75mm)

MAX9892

Shunt Mode Audio Click-and-Pop Eliminator

________________________________________________________________

Maxim Integrated Products

1

19-4295; Rev 0; 10/08

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.

+

Denotes a lead-free/RoHS-compliant package.

123

A

B

UCSP

TOP VIEW

(BUMPS ON BOTTOM)

INL

GND

INR

V

DD

SET

MUTE

4

3

INL

MUTE

5

2

GND

V

DD

6

1

INR

SET

μDFN

TOP VIEW

MAX9892

MAX9892

+

Pin Configurations

MAX9892

MUTE

SET

C

SET

V

DD

GND

1.7V TO 3.6V

HEADPHONE

AMPLIFIER

INL INR

R

SERIES

R

SERIES

0.1μF

Typical Operating Circuit

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX9892ERT+ -40°C to +85°C 6 UCSP

MAX9892ELT+ -40°C to +85°C 6 µDFN

MAX9892

Shunt Mode Audio Click-and-Pop Eliminator

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= 3.0V, V

GND

= 0, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

VDD, MUTE, SET to GND..........................................-0.3V to +6V

INL, INR to GND.................................(V

DD

- 6V) to (VDD+ 0.3V)

Continuous Current In/Out of V

DD

......................................30mA

Continuous Current In/Out of MUTE ...................................30mA

Continuous Current In/Out of SET.......................................30mA

Continuous Current In/Out of INL, INR and GND .............390mA

Continuous Power Dissipation (T

A

= +70°C)

6-Bump UCSP (derate 3.9mW/°C above +70°C) .....308.3mW

6-Pin µDFN (derate 4.5mW/°C above +70°C) ..........357.8mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Bump Temperature (soldering)

Reflow ..........................................................................+235°C

Note 1: All devices are 100% production tested at TA= +25°C. All temperature limits are guaranteed by design.
Note 2: Operating within the recommended supply voltage range ensures that negative audio signals are not limited by the device.

Supply voltages above the recommended supply voltage range may limit the headphone amplifier’s maximum output voltage.

Note 3: Supply current is measured when switches are off.

Supply Voltage Range V

Recommended Supply Voltage
Range

Supply Current I

Input Voltage Range V

Turn-On Time (Figure 1) t

Turn-Off Time (Figure 1) t

Turn-On Time Resistor R

Click-and-Pop Reduction R

Input Leakage Current I

MUTE Leakage Current I
MUTE Input-Voltage High V
MUTE Input-Voltage Low V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Guaranteed by RON test 1.7 5.5 V

(Note 2) 1.7 3.6 V

VDD = 5.5V, TA = +25°C (Note 3) 0.6 1 µA

Guaranteed by input leakage current test

IN

Measured from MUTE = GND and input
voltage settled to 90% of its final value

C

= 500pF 4 10 17

SET

C

= 50pF 1

SET

C

= 50nF 1000

SET

C

= 500pF 350 800 1300 kΩ

SET

V

OFF

DD

DD

DD

ON

SET

VDD = 3.0V 0.3

ON

VDD = 1.7V 2Switch On-Resistance R

VDD = 5.5V 1

= 30Ω, R

SERIES

IN

MUTE

TA = +25°C

VDD = 5.5V, V

IH

IL

V

-

DD

5.5V

V

DD

130 ns

= 16Ω 35 dB

LOAD

VIN = VDD - 5.5V, VDD = 1.7V ±1

V

= VDD, VDD = 5.5V ±1

IN

= 0 or 5.5V, TA = +25°C ±1 µA

MUTE

1.5 V

0.4 V

V

ms

Ω

µA

MAX9892

Shunt Mode Audio Click-and-Pop Eliminator

_______________________________________________________________________________________ 3

Typical Operating Characteristics

(VDD= 3.0V, V

GND

= 0, TA = +25°C, unless otherwise noted.)

0

-10

-20

-30

-40

-50

-60

CLICK AND POP (dBV)

-70

-80
INTO SHUTDOWN

-90

02010 4030 6050 8070 10090

1.0

0.8

0.6

(μA)

DD

I

0.4

0.2

CLICK AND POP vs. R

TESTED WITH THE MAX4338

OUT OF SHUTDOWN

R

SERIES

SERIES

MAX9892 toc01

(Ω)

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX9892 toc04

t

vs. C

OFF

1200

1000

800

(ms)

600

OFF

t

400

200

0

020155 10 253035404550

CLICK AND POP vs. V

0

-20

-40

-60

CLICK AND POP (dBV)

-80

SET

C

(nF)

SET

TESTED WITH THE MAX4338

OUT OF SHUTDOWN

INTO SHUTDOWN

RON vs. SUPPLY VOLTAGE

0.8

0.7

MAX9892 toc02

0.6

0.5

(Ω)

0.4

ON

R

0.3

0.2

0.1

0

1.5 2.5 3.5 4.5 5.5
VDD (V)

DD

MAX9892 toc05

SWITCH TURN-OFF/ON TIME

C

= 500pF

SET

MAX9892 toc06

MAX9892 toc03

MUTE
2V/div

IN_
2V/div

0

1.5 3.52.5 4.5 5.5
VDD (V)

-100

1.5 3.52.5 4.5 5.5
VDD (V)

CROSSTALK vs. FREQUENCY

0

-20

-40

-60

CROSSTALK (dB)

-80

-100

-120

0.01 100
FREQUENCY (kHz)

2ms/div

MAX9892 toc07

1010.1

MAX9892

Shunt Mode Audio Click-and-Pop Eliminator

4 _______________________________________________________________________________________

Pin Description

Timing Diagram

Figure 1. Turn-On/Off Time

UCSP µDFN

BUMP PIN

NAME FUNCTION

A1 1 INL

A2 2 GND Ground

A3 3 INR

B1 6 MUTE Active-Low Enable

B2 5 V

B3 4 SET

MUTE

IN_

Left-Channel Input. Connect INL in between the output coupling capacitor and the headphone
jack.

Right-Channel Input. Connect INR in between the output coupling capacitor and the
headphone jack.

Power Supply

DD

Turn-Off Time Set. Connect an external capacitor in between SET and GND to set the switch
open delay; see the Setting the Turn-Off Time section for more information.

GND

V

DD

GND

VDD - 5.5V

t

R

ON

OFF

t

ON

0.5Ω

Detailed Description

The MAX9892 is the second-generation click-and-pop
eliminator designed to be used with conventional head­phone amplifiers. The MAX9892 works by adding a low­impedance current path from the headphone side of
the DC-blocking capacitor to ground. Drive MUTE low
when turning off the amplifier, and high when enabling
the amplifier. A short turn-on time allows the switches in
the MAX9892 to close before the DC-blocking capaci­tors have significantly discharged, eliminating clicks
and pops at amplifier turn-off. An adjustable turn-off
time allows the delay to be set to mask all clicks and
pops during amplifier turn-on.

Setting the Turn-Off Time

The MAX9892 features a SET input that allows the turn­off time to be adjusted from 1ms to 1000ms to match
the click-and-pop profile of the amplifier startup. The
value of an external capacitor sets the switch open
delay, as shown in the following equation:

tON(ms) = 0.02 x C

SET

(pF)

When the headphone amplifier is enabled, the
MAX9892 automatically waits the set delay time before
opening the analog switches. This allows amplifier turn­on click and pop to be eliminated.

Applications Information

Setting the Supply Voltage

The MAX9892 operates from 1.7V to 3.6V supply volt­age. The inputs, INL and INR, accept voltage swings
from VDDto VDD- 5.5V. The audio signal applied to a
headphone is ground biased, meaning that the signal
swings just as much negative as positive. Since the
MAX9892 input voltage is limited to VDD- 5.5V on the
negative side, the voltage on VDDmust be set properly
to pass the audio signal when the switch is open
(Figure 2).

A voltage-divider can be used to scale down an avail­able supply voltage as shown in Figure 3. The voltage­divider allows the creation of a supply voltage for the
MAX9892 that is low enough to allow the negative por­tion of the audio signal to pass. When using large resis­tances for the voltage-divider, the supply current
affects what resistors to use. Select R2between 10kΩ
to 1MΩ for a given supply voltage. Use the following
equation to calculate the R1:

where V

AMP

is the supply voltage of the amplifier, and
I2is the current through R2. For a signal of ±2V in refer­ence to GND, the MAX9892 supply can be set from 2V
to 3.5V.

Selecting Series Resistors

A series resistor (R

SERIES

), as shown in the

Typical

Operating Circuit

, is necessary to achieve optimal click-

and-pop reduction. See the Click and Pop vs. R

SERIES

graph in the

Typical Operating Characteristics

for
details on how much click-and-pop reduction to expect
for a given series resistor.

Layout Considerations

Bypass VDDto GND with a 0.1µF capacitor. The 0.1µF
bypass capacitor should be positioned as close as
possible to VDD. Minimize trace length from GND to
solid system ground plane to ensure optimum perfor­mance.

Refer to the MAX9892 Evaluation Kit for a proven PCB
layout.

MAX9892

Shunt Mode Audio Click-and-Pop Eliminator

_______________________________________________________________________________________ 5

Figure 2. Proper Supply Selected for a Given Input Signal.
A: Supply Voltage with a Large Signal;
B: Supply Voltage with a Small Signal

VV

−

()

AMP DD

R

=

1

II

+

DD

2

A

V

DD

IN_

- 5.5V

V

DD

B

V

DD

IN_

V

- 5.5V

DD

GND

GND

MAX9892

UCSP Applications Information

For the latest application details on UCSP construction,
dimensions, tape-carrier information, printed circuit
board techniques, bump-pad layout, and recommend­ed reflow temperature profile, as well as the latest infor­mation on reliability testing results, refer to Application
Note 1891:

Understanding the Basics of the Wafer-

Level Chip-Scale Package (WL-CSP)

at www.maxim-

ic.com/ucsp. See Figure 4 for the recommended

MAX9892 PCB footprint.

Shunt Mode Audio Click-and-Pop Eliminator

6 _______________________________________________________________________________________

Figure 3. Scaling Down the Supply Voltage with a Voltage
Divider

Figure 4. PCB Footprint Recommendation Diagram

Chip Information

PROCESS: BiCMOS

HEADPHONE

AMP V

DD

R

1

V

DD

0.1μF

R

2

MAX9892

GND

45±5μm

250μm

MAX9892

Shunt Mode Audio Click-and-Pop Eliminator

_______________________________________________________________________________________ 7

Package Information

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.

PACKAGE TYPE PACKAGE CODE DOCUMENT NO.

6 UCSP R6-1A1+1

21-0228

6 µDFN L622-1

21-0164

UCSP.EPS

MAX9892

Shunt Mode Audio Click-and-Pop Eliminator

8 _______________________________________________________________________________________

Package Information (continued)

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.

D

AAA
AAA

PIN 1
INDEX AREA

SAMPLE
MARKING

7

A1

A

e

b

N

SOLDER
MASK
COVERAGE

6, 8, 10L UDFN.EPS

E

PIN 1

0.10x45∞

L

A A

1

L1

(N/2 -1) x e)

C

L

b

A

A2

L

e

EVEN TERMINAL

C

L

e

ODD TERMINAL

L

PACKAGE OUTLINE,
6, 8, 10L uDFN, 2x2x0.80 mm

21-0164

1

2

B

MAX9892

Shunt Mode Audio Click-and-Pop Eliminator

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.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________

9

© 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

Package Information (continued)

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.

COMMON DIMENSIONS

-

e b

0.65 BSC

0.40 BSC

MAX.

0.80

2.05

2.05

0.50

0.30±0.05

0.25±0.050.50 BSC8L822-1

0.20±0.03

(N/2 -1) x e

1.30 REF.

1.50 REF.

1.60 REF.

SYMBOL

A

A1

A2

D 1.95 2.00

E

L

L1

PACKAGE VARIATIONS

PKG. CODE

MIN.

0.70 0.75

0.15 0.20 0.25

0.020 0.025 0.035

1.95 2.00

0.30 0.40

0.10 REF.

N

6L622-1

10L1022-1

NOM.

PACKAGE OUTLINE,
6, 8, 10L uDFN, 2x2x0.80 mm

21-0164

2

2

B