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19-4295; Rev 0; 10/08
Shunt Mode Audio Click-and-Pop Eliminator
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 VDD to 5.5V below VDD. 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 DFN (2mm x 2mm x 0.75mm) packages. The MAX9892 is specified over the -40C to +85C temperature range. Less than 1A Supply Current 1.7V to 3.6V Single-Supply Operation Tiny Packages 6-Bump UCSP (1mm x 1.52mm x 0.6mm) 6-Pin DFN (2mm x 2mm x 0.75mm)
Features
Distortion-Free, Click-and-Pop Elimination
MAX9892
Ordering Information
PART MAX9892ERT+ MAX9892ELT+ TEMP RANGE -40C to +85C -40C to +85C PIN-PACKAGE 6 UCSP 6 DFN
+Denotes a lead-free/RoHS-compliant package.
Pin Configurations
TOP VIEW (BUMPS ON BOTTOM) 1 2 3
Applications
Mobile Phones Smart Phones Mobile Internet Devices Portable Gaming Consoles Portable Media Players Notebook Computers
A
INL
GND
INR
MAX9892
VDD
B
MUTE
SET
Typical Operating Circuit
RSERIES HEADPHONE AMPLIFIER UCSP
TOP VIEW
RSERIES MUTE 6 VDD 5 SET 4
INL 1.7V TO 3.6V
INR
MAX9892 MAX9892
VDD MUTE
0.1F + SET GND C SET 1 INL 2 GND 3 INR
DFN
________________________________________________________________ Maxim Integrated Products
1
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.
Shunt Mode Audio Click-and-Pop Eliminator MAX9892
ABSOLUTE MAXIMUM RATINGS
VDD, MUTE, SET to GND..........................................-0.3V to +6V INL, INR to GND .................................(VDD - 6V) to (VDD + 0.3V) Continuous Current In/Out of VDD ......................................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 (TA = +70C) 6-Bump UCSP (derate 3.9mW/C above +70C) .....308.3mW 6-Pin DFN (derate 4.5mW/C above +70C) ..........357.8mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Bump Temperature (soldering) Reflow ..........................................................................+235C
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.
ELECTRICAL CHARACTERISTICS
(VDD = 3.0V, VGND = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range Recommended Supply Voltage Range Supply Current Input Voltage Range Turn-On Time (Figure 1) SYMBOL VDD VDD IDD VIN tON CONDITIONS Guaranteed by RON test (Note 2) VDD = 5.5V, TA = +25C (Note 3) Guaranteed by input leakage current test Measured from MUTE = GND and input voltage settled to 90% of its final value CSET = 500pF Turn-Off Time (Figure 1) Turn-On Time Resistor Switch On-Resistance Click-and-Pop Reduction Input Leakage Current MUTE Leakage Current MUTE Input-Voltage High MUTE Input-Voltage Low IIN IMUTE VIH VIL tOFF RSET RON CSET = 50pF CSET = 50nF CSET = 500pF VDD = 3.0V VDD = 1.7V VDD = 5.5V RSERIES = 30, RLOAD = 16 TA = +25C VIN = VDD - 5.5V, VDD = 1.7V VIN = VDD, VDD = 5.5V 1.5 0.4 35 1 1 1 350 4 VDD 5.5V 130 10 1 1000 800 0.3 2 1 dB A A V V 1300 k 17 ms MIN 1.7 1.7 0.6 TYP MAX 5.5 3.6 1 VDD UNITS V V A V ns
VDD = 5.5V, VMUTE = 0 or 5.5V, TA = +25C
Note 1: All devices are 100% production tested at TA = +25C. 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.
2
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Shunt Mode Audio Click-and-Pop Eliminator
Typical Operating Characteristics
(VDD = 3.0V, VGND = 0, TA = +25C, unless otherwise noted.)
MAX9892
CLICK AND POP vs. RSERIES
MAX9892 toc01
tOFF vs. CSET
MAX9892 toc02
RON vs. SUPPLY VOLTAGE
0.7 0.6
MAX9892 toc03
0 -10 -20 CLICK AND POP (dBV) -30 TESTED WITH THE MAX4338
1200 1000 800 tOFF (ms)
0.8
-40 -50 -60 -70 -80 -90 0 10 20 30 40 50 60 70 80 90 100 RSERIES () OUT OF SHUTDOWN
RON ()
0.5 0.4 0.3 0.2
600 400 200
INTO SHUTDOWN 0 0 5 10 15 20 25 30 35 40 45 50 CSET (nF)
0.1 0 1.5 2.5 3.5 VDD (V) 4.5 5.5
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9892 toc04
CLICK AND POP vs. VDD
MAX9892 toc05
SWITCH TURN-OFF/ON TIME
MAX9892 toc06
1.0
0 TESTED WITH THE MAX4338 -20 CLICK AND POP (dBV)
CSET = 500pF MUTE 2V/div
0.8
IDD (A)
0.6
-40
0.4
-60 OUT OF SHUTDOWN -80 INTO SHUTDOWN IN_ 2V/div
0.2
0 1.5 2.5 3.5 VDD (V) 4.5 5.5
-100 1.5 2.5 3.5 VDD (V) 4.5 5.5 2ms/div
CROSSTALK vs. FREQUENCY
MAX9892 toc07
0 -20 CROSSTALK (dB) -40 -60 -80 -100 -120 0.01 0.1 1 FREQUENCY (kHz) 10
100
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Shunt Mode Audio Click-and-Pop Eliminator MAX9892
Pin Description
UCSP BUMP A1 A2 A3 B1 B2 B3 DFN PIN 1 2 3 6 5 4 NAME FUNCTION Left-Channel Input. Connect INL in between the output coupling capacitor and the headphone jack. Ground Right-Channel Input. Connect INR in between the output coupling capacitor and the headphone jack. Active-Low Enable Power Supply 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.
INL GND INR MUTE VDD SET
Timing Diagram
MUTE GND VDD IN_ VDD - 5.5V GND
tOFF RON
tON 0.5
Figure 1. Turn-On/Off Time
4
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Shunt Mode Audio Click-and-Pop Eliminator
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. where VAMP is the supply voltage of the amplifier, and I2 is the current through R2. For a signal of 2V in reference to GND, the MAX9892 supply can be set from 2V to 3.5V.
MAX9892
Selecting Series Resistors
A series resistor (RSERIES), as shown in the Typical Operating Circuit, is necessary to achieve optimal clickand-pop reduction. See the Click and Pop vs. RSERIES 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 VDD to GND with a 0.1F capacitor. The 0.1F 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.
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 CSET (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.
A VDD
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 VDD to 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 VDD must 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 R2 between 10k to 1M for a given supply voltage. Use the following equation to calculate the R1: R1 = (VAMP - VDD ) I2 + IDD
IN_
GND
VDD - 5.5V
B VDD
IN_ VDD - 5.5V
GND
Figure 2. Proper Supply Selected for a Given Input Signal. A: Supply Voltage with a Large Signal; B: Supply Voltage with a Small Signal
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Shunt Mode Audio Click-and-Pop Eliminator 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 WaferLevel Chip-Scale Package (WL-CSP) at www.maximic.com/ucsp. See Figure 4 for the recommended MAX9892 PCB footprint.
HEADPHONE AMP VDD R1 VDD
MAX9892
R2 0.1F GND 455m 250m
Figure 3. Scaling Down the Supply Voltage with a Voltage Divider
Figure 4. PCB Footprint Recommendation Diagram
Chip Information
PROCESS: BiCMOS
6
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Shunt Mode Audio Click-and-Pop Eliminator
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 6 UCSP 6 DFN PACKAGE CODE R6-1A1+1 L622-1 DOCUMENT NO. 21-0228 21-0164
MAX9892
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UCSP.EPS
7
Shunt Mode Audio Click-and-Pop Eliminator MAX9892
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. 6, 8, 10L UDFN.EPS
1 2
D
A
e
b
N
AAA AAA
E
SOLDER MASK COVERAGE
PIN 1 0.10x45
L
PIN 1 INDEX AREA SAMPLE MARKING 1 A A
L1
7
(N/2 -1) x e)
C L
C L
b A A2 A1
L e
EVEN TERMINAL
L e
ODD TERMINAL
PACKAGE OUTLINE, 6, 8, 10L uDFN, 2x2x0.80 mm
21-0164
B
8
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Shunt Mode Audio Click-and-Pop Eliminator
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
MAX9892
COMMON DIMENSIONS SYMBOL A A1 A2 D E L L1 MIN. 0.70 0.15 0.020 1.95 1.95 0.30 NOM. 0.75 0.20 0.025 2.00 2.00 0.40 0.10 REF. MAX. 0.80 0.25 0.035 2.05 2.05 0.50
PACKAGE VARIATIONS PKG. CODE L622-1 L822-1 L1022-1 N 6 8 10 e 0.65 BSC 0.50 BSC 0.40 BSC b 0.300.05 0.250.05 0.200.03 (N/2 -1) x e 1.30 REF. 1.50 REF. 1.60 REF.
PACKAGE OUTLINE, 6, 8, 10L uDFN, 2x2x0.80 mm
21-0164
B
2
2
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
(c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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