TOP VIEW. Maxim Integrated Products 1

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1 9-349; Rev ; /5 Stereo Audio Taper Potentiometers General Description The dual, logarithmic taper digital potentiometers feature a simple pushbutton interface that controls volume and balance in audio applications. Each potentiometer has 3 tap points and replaces mechanical potentiometers. Refer to the MAX548 MAX54 data sheet for SPI versions of the MAX5456/ MAX5457. Use the digital inputs with momentary contact single-pole/single-throw (SPST) pushbutton switches. Each input includes internal debounce circuitry and a 5kΩ pullup resistor. The advance the wiper setting once per button push. Maxim s proprietary SmartWiper control eliminates the need for a microcomputer to increase the wiper transition rate. Holding the control input low for more than s advances the wiper at a rate of 4Hz for 4s and 6Hz per second thereafter. The provide temperature coefficients of 5ppm/ C end-to-end and 5ppm/ C ratiometric and a nominal resistance of kω per potentiometer. An integrated click/pop suppression feature minimizes the audible noise generated by wiper transitions. The typical total harmonic distortion plus noise (THD+N) for these devices is.%. The MAX5457 features a 3-button interface with a MODE input that toggles between volume- and balancecontrol modes. An LED output indicates volume or balance mode. The MAX5456 features a 4-button interface with separate inputs for up and down volume controls and left and right balance controls. The are available in 6-pin QSOP and 6-pin TQFN packages and are specified over the extended (-4 C to +85 C) temperature range. Features SmartWiper Control Provides Accelerated Wiper Motion Debounced Pushbutton Interface with Internal Pullup Resistors Logarithmic Taper with db Steps Between Taps Single +.7V to +5.5V or Dual ±.7V Supply Operation Low.5µA Standby Supply Current Clickless Switching kω End-to-End Fixed Resistance Value Mute Function to -9dB (typ) Power-On Reset to -db Wiper Position 3 Tap Positions for Each Wiper Small 6-Pin QSOP/TQFN Packages Ordering Information PART TEMP RANGE PIN- PACKAGE PKG CODE MAX5456EEE -4 o C to +85 o C 6 QSOP E6- MAX5456ETE* -4 o C to +85 o C 6 TQFN T644-4 MAX5457EEE -4 o C to +85 o C 6 QSOP E6- MAX5457ETE* -4 o C to +85 o C 6 TQFN T644-4 *Future product contact factory for availability. TOP VIEW Pin Configurations Stereo Volume Control Fading and Balancing Stereo Signals Stereo Blending and Mixing Applications DN/BAL UP/BAL MODE MODE_IND H MAX V LOGIC GND V SS H Typical Application Circuits and Selector Guide appear at end of data sheet. L 6 7 L SPI is a trademark of Motorola, Inc. SmartWiper is a trademark of Maxim Integrated Products, Inc. SHDN 8 9 MUTE QSOP Pin Configurations are continued at end of data sheet. Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at , or visit Maxim s website at

2 ABSOLUTE MAXIMUM RATINGS (MAX5456) SHDN, MUTE, VOLUP, VOLDN, BAL_ to GND...-.3V to (V LOGIC +.3V) (MAX5457) SHDN, MUTE, UP/BAL, DN/BAL, MODE, MODE_IND to GND...-.3V to (V LOGIC +.3V) H_, L_, and W_ to V SS...-.3V to ( +.3 V) to GND...-.3V to +6V to V SS...-.3V to +6V V LOGIC to GND...-.3V to +6V V LOGIC to V SS...-.3V to +6V V SS to GND...-3.V to +.3V 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 Peak Current into H_, L_, and W_...±mA Average Current into H_, L_, and W_...±5µA Input and Output Latchup Immunity...±mA Continuous Power Dissipation (T A = +7 C) 6-Pin QSOP (derate 8.3mW/ C above +7 C) mW 6-Pin TQFN (derate 6.9mW/ C above +7 C) mW Operating Temperature Range...-4 C to +85 C Junction Temperature...+5 C Storage Temperature Range...-6 C to +5 C Lead Temperature (soldering, s)...+3 C ( = V LOGIC = +.7V to +5.5V, V SS = V, GND = V, V H_ =, V L_ = V SS, T A = T MIN to T MAX. Typical values are at T A = +5 C, unless otherwise specified.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS End-to-End Resistance R Figures, 7 3 kω Maximum Bandwidth f CUTOFF From H_ to W_, C LOAD = pf khz Absolute Ratio Tolerance N o l oad at the outp ut of the w i p er, W _ = - 6d B ±.5 db Tap-to-Tap Tolerance ±. db Total Harmonic Distortion Plus Noise THD+N = 5V, V H_ = ( / ) + V RMS, f = khz, tap = -6dB, V L_ = /, R L = = 3V, V SS = V, V L_ =.5V, V H_ =.5V + V RMS, f = khz, R L = kω to ( / ), C L = 5pF, tap = -6dB..3 % Channel-to-Channel Isolation - db Interchannel Matching f = Hz to khz, tap = -6dB ±.5 db Mute Attenuation -9 db Power-Supply Rejection Ratio PSRR -8 db Wiper Resistance R W 7 Ω Wiper Capacitance C W pf H Terminal Capacitance C H 5 pf L Terminal Capacitance C L 7 pf End-to-End Resistance Temperature Coefficient 5 ppm/ C Ratiometric Resistance Temperature Coefficient 5 ppm/ C Output Noise e n Hz to khz.95 µv RMS PUSHBUTTON CONTACT INPUTS (UP/BAL, DN/BAL, MUTE, VOLUP, VOLDN, BAL, BAL, MODE) Internal Pullup Resistor R PULLUP kω Single Pulse-Width Input t lpw Figure 5.5 ms Repetitive Input Pulse High Time t HPW Figure 5 4 ms Timeout Period t WS Click/pop suppression inactive 3 ms

3 ELECTRICAL CHARACTERISTICS (continued) ( = V LOGIC = +.7V to +5.5V, V SS = V, GND = V, V H_ =, V L_ = V SS, T A = T MIN to T MAX. Typical values are at T A = +5 C, unless otherwise specified.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS First Autoincrement Point s First Autoincrement Rate 4 Hz Second Autoincrement Point 4 s Second Autoincrement Rate 6 Hz DIGITAL INPUTS (V LOGIC > 4.5V) Input High Voltage V IH.4 V Input Low Voltage V IL.8 V Input Leakage Current Inputs floating ± µa Input Capacitance 5 pf DIGITAL INPUTS (V LOGIC < 4.5V) Input High Voltage V IH.7 x V L OGIC V Input Low Voltage V IL.3 x V L OGIC V Input Leakage Current Inputs floating ± µa Input Capacitance 5 pf POWER SUPPLIES Supply Voltage V Negative Power Supply V SS -.7 V Supply-Voltage Difference - V SS 5.5 V Active Supply Current I DD (Note ) µa V D D = + 5.5V, V S S = V, V LOGIC =.7V ( N ote 3) Standby Supply Current I STBY V LOGIC = = +.7V, V SS = -.7V (Note 3).5 Shutdown Supply Current I SHDN (Note 4) µa Power-Up Time t PU ms Logic Standby Voltage V LOGIC.7 V Logic Active Supply Current I LOGIC (Note ) 6 µa Logic Standby Supply Current I LOGICSTBY (Note 3).5 µa Logic Shutdown Current I LOGICSHDN (Note 4) µa DIGITAL OUTPUT, MODE_IND V LOGIC =.7V, I SINK = ma.4 Output Low Voltage V OL V LOGIC = 5.5V, I SINK = ma. Output Leakage Current. µa Output Capacitance 3 pf Maximum Sink Current 5 ma Note : Parameters are % production tested at +85 C and limits through temperature are guaranteed by design. Note : Supply current measured with the supply on and a button pushed. Note 3: Supply current measured with the power on, no button pushed, and the wiper position fixed. Note 4: This is the measured current with SHDN low and MODE_IND unconnected. µa V 3

4 Typical Operating Characteristics ( = V LOGIC = +.7V to +5.5V, V SS = V, GND = V, V H _ =, V L _ = V SS, T A = T MIN to T MAX. Typical values are at T A = +5 C, unless otherwise specified.) WIPER RESISTANCE (Ω) WIPER RESISTANCE vs. WIPER VOLTAGE 5 = V LOGIC = 5V WIPER VOLTAGE (V) MAX5456/7 toc ATTENUATION (db) ATTENUATION vs. TAP POSITION TAP POSITION MAX5456/7 toc END-TO-END RESISTANCE CHANGE (%) END-TO-END RESISTANCE % CHANGE vs. TEMPERATURE TEMPERATURE ( C) MAX5456/7 tpc3 ACTIVE SUPPLY CURRENT (µa) ACTIVE SUPPLY CURRENT vs. TEMPERATURE = V LOGIC = 5.5V, I LOGIC + I VDD MAX5456/7 toc4 5V/div V/div WIPER SWITCHING TRANSIENT (TIMING OUT) V H_ = V L_ = MAX5456/7 toc5a VOLUP WIPER TRANSITION FROM -db to db TEMPERATURE ( C) ms/div 5V/div V/div WIPER SWITCHING TRANSIENT (SUPPRESSION CIRCUIT ACTIVE) V H _ = SQUARE WAVE FROM TO V SS, V L _ = / MAX5456/7 toc5b VOLUP WIPER TRANSITION FROM -db to db LOGIC SUPPLY CURRENT (µa) LOGIC SUPPLY CURRENT vs. LOGIC SUPPLY VOLTAGE ACTIVE LOGIC SUPPLY CURRENT MAX5456/7 toc6a 4ms/div LOGIC SUPPLY VOLTAGE (V)

5 Typical Operating Characteristics (continued) ( = V LOGIC = +.7V to +5.5V, V SS = V, GND = V, V H _ =, V L _ = V SS, T A = T MIN to T MAX. Typical values are at T A = +5 C, unless otherwise specified.) LOGIC SUPPLY CURRENT (µa) LOGIC SUPPLY CURRENT vs. LOGIC SUPPLY VOLTAGE STANDBY LOGIC SUPPLY CURRENT LOGIC SUPPLY VOLTAGE (V) MAX5456/7 toc6b NOMINAL END-TO-END RESISTANCE (%RHL) WIPER-TO-END TERMINAL RESISTANCE vs. TAP POSITION R WH R WL TAP POSITION MAX5456/7 toc7 RESPONSE (db) FREQUENCY RESPONSE V H_ =.5V ±V P-P, V L_ =.5V, C L_ = pf W_ SET TO db W_ SET TO -6dB -8.. FREQUENCY (khz) MAX5456/7 toc8 THD+N (%) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY V H_ =.5V ±V P-P, V L_ =.5V, W_ SET TO -6dB, Hz TO khz BANDPASS... LOAD = kω NO LOAD MAX5456/7 toc9 DIGITAL SUPPLY CURRENT (µa) DIGITAL SUPPLY CURRENT vs. DIGITAL INPUT VOLTAGE MAX5456/7 toc PSRR (db) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY = 5V ±V P-P, V H_ = 5V, V L_ =.5V, W_ SET TO -6dB MAX5456/7 toc.,, FREQUENCY (Hz) DIGITAL INPUT VOLTAGE (V) -9 FREQUENCY (khz) LOGIC SUPPLY CURRENT (ma) LOGIC SUPPLY CURRENT vs. TEMPERATURE 5 49 V LOGIC = 5.5V ACTIVE LOGIC SUPPLY CURRENT TEMPERATURE ( C) MAX5456/7 toc NOISE (nvrms/ Hz) SPECTRAL NOISE DENSITY FREQUENCY (khz) MAX5456 toc3 5

6 MAX5457 PIN MAX5456 TQFN QSOP TQFN QSOP NAME 3 MODE 4 MODE_IND FUNCTION Pin Description Volume/Balance Control. Each transition from high to low toggles between volume and balance modes. MODE is pulled high internally with a 5kΩ resistor to V LOGIC. On power-up, the MAX5457 is in volume-control mode. Volume-Control/Balance-Control Mode Indicator Open-Drain Output. Connect to an LED through a resistor to V LOGIC. When the LED is on, the MAX5457 is in balance-control mode. When the LED is off, the MAX5457 is in volume-control mode. See the Mode Indicator, MODE_IND section for more detail H Potentiometer High Terminal. H and L terminals can be reversed L Potentiometer Low Terminal. L and H terminals can be reversed Potentiometer Wiper Terminal SHDN Active-Low Shutdown Input. In shutdown mode, the store the last wiper settings. The wipers move to the L end of the resistor string, and the H end of the resistor string disconnects from the signal input. Terminating shutdown mode restores the wipers to their previous settings MUTE 8 8 Potentiometer Wiper Terminal Mute Input. When MUTE is low, the wiper goes to the highest attenuation setting (see Table ). MUTE is internally pulled up with 5kΩ to V LOGIC. 9 9 L Potentiometer Low Terminal. L and H terminals can be reversed. H Potentiometer High Terminal. H and L terminals can be reversed. 3 3 V SS Negative Power Supply. Bypass with.µf to ground. 4 4 GND Ground V LOGIC Digital Logic Power Supply. Bypass with.µf to ground Analog Power Supply. Bypass with.µf to ground. 5 DN/BAL Downward Volume/Channel Balance-Control Input. In volume mode, pressing DN/BAL moves both wipers towards the L terminals. In balance mode, pressing DN/BAL moves the balance towards channel. DN/BAL is internally pulled up with 5kΩ to V LOGIC. 6 UP/BAL 3 BAL 4 BAL 5 VOLDN 6 VOLUP Upward Volume/Channel Balance-Control Input. In volume mode, pressing UP/BAL moves both wipers towards the H terminals. In balance mode, pressing UP/BAL moves the balance towards channel. UP/BAL is internally pulled up with 5kΩ to V LOGIC. Channel Balance-Control Input. Pressing BAL moves the balance towards channel. BAL is internally pulled up with 5kΩ to V LOGIC. Channel Balance-Control Input. Pressing BAL moves the balance towards channel. BAL is internally pulled up with 5kΩ to V LOGIC. Downward Volume-Control Input. Pressing VOLDN moves both wipers towards the L terminals. VOLDN is internally pulled up with 5kΩ to V LOGIC. Upward Volume-Control Input. Pressing VOLUP moves both wipers towards the H terminals. VOLUP is internally pulled up with 5kΩ to V LOGIC. 6

7 Detailed Description The dual, logarithmic taper digital potentiometers feature a simple pushbutton interface that controls volume and balance in audio applications. Each potentiometer has 3 tap points and replaces mechanical potentiometers (see the Functional Diagrams). Up and Down Interface The interface with momentary contact SPST switches. All switch inputs are internally debounced and pulled up to V LOGIC through 5kΩ resistors. The wiper setting advances once per button press up to s. Maxim s SmartWiper control circuitry allows the wiper to advance at a rate of 4Hz when an input is held low from s up to 4s, and at a rate of 6Hz if the contact is maintained for greater than 4s (see Table ). The SmartWiper control eliminates the need for a microcomputer to increase the wiper transition rate. The MAX5456 features independent control inputs for volume and balance control while the MAX5457 MODE input toggles between volume and balance control. Each transition of MODE from high to low toggles the MAX5457 between volume-control and balance-control modes. MODE is internally pulled high with a 5kΩ resistor to V LOGIC. W_ MAX5456 MAX5457 C W R W Figure. Potentiometer Model (Active) MAX5456 MAX5457 R C H C L H_ L_ H_ Volume Control In volume-control mode, the s wipers move simultaneously, maintaining the balance separation between each wiper (Figure 3a). When either wiper reaches the maximum tap position (position closest to H_), further commands to increase the volume are ignored. Balance separation is maintained in the maximum volume configuration (Figure 3b). When either wiper reaches the minimum tap position (position closest to L_), further commands to decrease the volume adjust the other wiper until it also reaches the minimum tap position (Figure 3c). Increasing the volume from this minimum position restores the original balance separation of the wipers (Figure 3d). When both wipers are in the 3st tap position (-6dB attenuation), further commands to VOLDN place the wipers in the mute position (see Table ). VOLUP or MUTE pulses return wipers to position 3. W_ C W R W R C H C L L_ Figure. Potentiometer Model (Shutdown) 7

8 H_ L_ H_ L_ (a) (b) PRESS VOLUP PRESS VOLDN TWICE ONCE PRESS VOLUP PRESS VOLUP ONCE BALANCE SEPARATION MAINTAINED NO CHANGE H_ (c) PRESS VOLDN PRESS VOLDN ONCE TO 3d L_ FROM 3c H_ PRESS VOLUP PRESS VOLUP ONCE ONCE ORIGINAL BALANCE SEPARATION MAINTAINED (d) L_ Figure 3. Volume-Control Operation Table. Wiper Position and Attenuation POSITION ATTENUATION (db) 4 6 (POR) (mute) >9 8

9 Balance Control In balance-control mode, the adjust the balance between channel and channel while maintaining the set volume. For example, if the volume of channel equals the volume of channel, forcing the balance towards channel increases the attenuation of channel (Figure 4a). If channel is at a higher attenuation than channel, adjusting the balance to channel moves channel s wiper up to the same wiper position as channel before attenuating channel (Figure 4b). To control the wiper quickly with a logic signal, maintain pulses at least.5ms wide and separated by at least 4ms. H_ VOLUME LEVEL IS SET Table. Wiper Action vs. Pushbutton Contact Duration CONTACT DURATION t <.5ms.5ms < t s s < t 4s t > 4s PRESS BAL PRESS BAL ONCE ONCE WIPER ACTION No motion (debouncing). Wiper changes position once. Wiper changes position at a rate of 4Hz. Wiper changes position at a rate of 6Hz. VOLUME LEVEL MAINTAINED BALANCE SHIFTS TO (a) L_ H_ VOLUME LEVEL MAINTAINED VOLUME LEVEL IS SET BY BALANCE SHIFTS TO PRESS BAL PRESS BAL ONCE ONCE (b) L_ Figure 4. Balance-Control Operation 9

10 Click/Pop Suppression The click/pop suppression feature reduces the audible noise (clicks and pops) that result from wiper transitions. The minimize this noise by allowing the wiper position changes only when V H_ = V L_. Thus, the wiper changes position only when the voltage at L_ is the same as the voltage at the corresponding H_. Each wiper has its own suppression and timeout circuitry (see Figure 5a). The change wiper position after 3ms or when V H_ = V L, whichever occurs first (see Figure 5b). USER PRESSES PUSHBUTTON SWITCH SWITCH CONTACT CONTACT IS BOUNCING IS STABLE The suppression circuitry monitors left and right channels separately. In volume-control mode, when the first wiper changes position, the second wiper has 3ms to change or it will be forced to change. Power-On Reset The power-on comparators monitor - V SS and V LOGIC - GND. A power-on reset is initiated when either of the supplies is brought back to normal operating voltage. The power-on-reset feature sets both wipers to -db. Power-on reset places the MAX5457 in volumecontrol mode. SWITCH CONTACT IS BOUNCING READY TO ACCEPT ANOTHER KEYPRESS DN OR UP INPUT ACCEPTED t HPW t IPW t WS WAIT FOR DEBOUNCE BY FIRST ZERO WAITING FOR CROSSING, t WS STABLE LOW, t IPW DEBOUNCE BY WAITING FOR STABLE HIGH, t HPW V H V L WIPER MOVES HERE WIPER MOTION db STEPS Figure 5a. Wiper Transition Timing Diagram

11 Shutdown, SHDN Upon entering shutdown mode, the store the last wiper settings. The wipers move to the L_ end of the resistor string, and the H_ end of the resistor string disconnects from the signal input. Terminating shutdown mode restores the wipers to their previous settings (see Figure ). Shutdown does not affect the state of MODE_IND. Mute Function, MUTE The feature a mute function. Successive pulses on MUTE toggle its setting. Activating the mute SWITCH SWITCH CONTACT CONTACT IS BOUNCING IS STABLE function forces both wipers to maximum attenuation (- 9dB typ). Deactivating the mute function returns the wipers to their previous settings. Pressing VOLUP also deactivates mute, setting the wipers to their previous positions. MUTE is internally pulled high with a 5kΩ resistor to VLOGIC. When both wipers are in the 3st tap position (-6dB attenuation), further commands to VOLDN place the wipers in the mute position (see Table ). VOLUP or MUTE pulses return the wipers to position 3. SWITCH CONTACT IS BOUNCING READY TO ACCEPT ANOTHER KEYPRESS INPUT ACCEPTED t HPW t IPW DEBOUNCE BY WAITING FOR STABLE LOW, t IPW t WS WAIT FOR FIRST ZERO CROSSING OR TIMEOUT, t WS DEBOUNCE BY WAITING FOR STABLE HIGH, t HPW V H V L WIPER MOVES HERE (t IPW + t WS ) db STEPS Figure 5b. Wiper Transition Timing Diagram

12 Mode Control, MODE The MAX5457 MODE input toggles between volumeand balance-control modes. Force MODE low to toggle between volume-control and balance-control modes. For example, driving MODE low once while in volumecontrol mode, switches the MAX5457 to balance-control mode. Driving mode low once again, switches the MAX5457 back to volume-control mode. MODE is internally pulled high with a 5kΩ resistor to V LOGIC. The MAX5457 powers up in volume-control mode. Mode Indicator, MODE_IND MODE_IND is the volume-control and balance-control mode indicator with an open-drain output. Connect MODE_IND to an LED through a pullup resistor to V LOGIC. When the LED is on, the MAX5457 is in balancecontrol mode. When the LED is off, the MAX5457 is in volume-control mode. See the Mode Control, MODE section for more detail on switching between modes. Shutdown does not affect the state of MODE_IND. Multiple Button Pushes The do not respond to simultaneous button pushes. Pushing more than one button at the same time stops the wipers in their present states. Only a single button push configures the device. Additionally, a 4ms blocking period affects all other inputs when releasing any input forced low. The do not respond to any logic input until the blocking period ends. If multiple wiper-control buttons are pressed, all wiper-control connections must be released before the part will respond to further commands. Applications Information Stereo Volume/Balance Control Figure 6 shows a volume/balance application using the MAX5457. The op amp is connected in a follower (noninverting gain) configuration to isolate the potentiometer s wiper impedance from the load and provide drive capability. Connect the W_ of the MAX5457 to the positive input of a noninverting gain amp. The pushbutton potentiometers attenuate the input signals. Use the MODE input to switch between volume-control and balance-control modes.

13 LEFT CHANNEL IN H V LOGIC L L MAX5457 / / SHDN V LOGIC MODE_IND H RIGHT CHANNEL IN GND V SS MUTE UP/BAL DN/BAL MODE LEFT AUDIO INPUT RIGHT AUDIO INPUT INL- INL+ SHDN INR+ INR- MAX4494 MAX4494 S PGND MAX97 OUTL OUTR STEREO HEADPHONE Figure 6. Volume/Balance Control 3

14 Selector Guide PART INTERFACE PKG. CODE MAX5456EEE 4-Button E6- MAX5456ETE* 4-Button T644-4 MAX5457EEE 3-Button E6- MAX5457ETE* 3-Button T644-4 *Future product contact factory for availability. TOP VIEW VOLDN 6 Chip Information TRANSISTOR COUNT: 5,395 PROCESS: CMOS Pin Configurations (continued) VOLUP 6 VOLDN VDD VLOGIC VOLUP BAL BAL H MAX V LOGIC GND V SS H BAL BAL H 3 L 6 7 L 4 9 SHDN 8 9 MUTE QSOP UP/BAL DN/BAL VDD VLOGIC MODE GND MODE_IND H 3 MAX5457 V SS H L 4 9 L SHDN MUTE MAX5456 GND V SS H L L SHDN MUTE TQFN TQFN 4

15 V PEAK / H_ R H R L L_ Typical Application Circuit (Single Supply) V PEAK / W_ R LOAD = V PEAK / Typical Application Circuit (Dual Supplies) R LOAD = V PEAK V H_ R H R L W_ V PEAK V V PEAK V L_ V SS V SS = - 5

16 H SHUTDOWN 3 V LOGIC SHDN CLICK/POP SUPPRESSION CIRCUITRY MAX5456 CLICK/POP SUPPRESSION CIRCUITRY Functional Diagrams SHUTDOWN H POSITION COUNTER POSITION COUNTER UP/DN UP/DN 8 TIMING AND CONTROL 8 9 T F-F 9 DEBOUNCE DEBOUNCE DEBOUNCE DEBOUNCE DEBOUNCE V LOGIC MUTE 3 MUTE L L V SS GND VOLUP VOLDN BAL BAL MUTE 6

17 H SHUTDOWN 3 V LOGIC SHDN MODE_IND CLICK/POP SUPPRESSION CIRCUITRY MAX5457 Functional Diagrams (continued) CLICK/POP SUPPRESSION CIRCUITRY SHUTDOWN 3 H 4 4 POSITION COUNTER POSITION COUNTER UP/DN UP/DN 8 TIMING AND CONTROL 8 9 T F-F T F-F 9 DEBOUNCE DEBOUNCE DEBOUNCE DEBOUNCE 3 V LOGIC MUTE 3 MUTE L L V SS GND DN/BAL UP/BAL MODE MUTE 7

18 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to QSOP.EPS PACKAGE OUTLINE, QSOP.5",.5" LEAD PITCH -55 E 8

19 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to 4L QFN THIN.EPS PACKAGE OUTLINE,, 6,, 4, 8L THIN QFN, 4x4x.8mm -39 E 9

20 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to PACKAGE OUTLINE,, 6,, 4, 8L THIN QFN, 4x4x.8mm -39 E 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, San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.