EVALUATION KIT AVAILABLE MAX5456/MAX5457 General Description The MAX5456/MAX5457 dual, logarithmic taper digital potentiometers feature a simple pushbutton interface that controls volume and balance in audio applications. Each potentiometer has 32 tap points and replaces mechanical potentiometers. Refer to the MAX548 MAX54 data sheet for SPI versions of the MAX5456/ MAX5457. Use the MAX5456/MAX5457 digital inputs with momentary contact single-pole/single-throw (SPST) pushbutton switches. Each input includes internal debounce circuitry and a 5kΩ pullup resistor. The MAX5456/MAX5457 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 MAX5456/MAX5457 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 MAX5456/MAX5457 is available in a 6-pin QSOP packages and specified over the extended (-4 C to +85 C) temperature range. Stereo Volume Control Fading and Balancing Stereo Signals Stereo Blending and Mixing Applications Features SmartWiper Control Provides Accelerated Wiper Motion Debounced Pushbutton Interface with Internal Pullup Resistors Logarithmic Taper with 2dB Steps Between Taps Single +2.7V to +5.5V or Dual ±2.7V 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 -2dB Wiper Position 32 Tap Positions for Each Wiper Small 6-Pin QSOP Package Ordering Information PART TEMP RANGE PIN-PACKAGE MAX5456EEE+ -4 o C to +85 o C 6 QSOP MAX5457EEE+ -4 o C to +85 o C 6 QSOP +Denotes a lead(pb)-free/rohs-compliant package. Note: For leaded version, contact factory. TOP VIEW DN/BAL UP/BAL MODE MODE_IND 2 3 4 + Pin Configurations MAX5457 6 5 V LOGIC 4 GND 3 V SS H 5 2 H L 6 L W 7 Typical Application Circuits and Selector Guide appear at end of data sheet. SHDN 8 QSOP 9 MUTE SmartWiper is a trademark of Maxim Integrated Products, Inc. Pin Configurations are continued at end of data sheet. For pricing, delivery, and ordering information, please contact Maxim Direct at -888-629-4642, or visit Maxim Integrated s website at www.maximintegrated.com. 9-349; Rev 2; 8/2
ABSOLUTE MAXIMUM RATINGS (MAX5456) SHDN, MUTE, VOLUP, VOLDN, BA to GND...-.3V to (V LOGIC +.3V) (MAX5457) SHDN, MUTE, UP/BAL, DN/BAL, MODE, MODE_IND to GND...-.3V to (V LOGIC +.3V),, 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 Peak Current into,, and W_...±mA Average Current into,, and W_...±5µA Input and Output Latchup Immunity...±2mA Continuous Power Dissipation (T A = +7 C) 6-Pin QSOP (derate 8.3mW/ C above +7 C)...666.7mW 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 Soldering Temperature (reflow)...+26 C 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 ( = V LOGIC = +2.7V to +5.5V, V SS = V, GND = V, V =, V = V SS, T A = T MIN to T MAX. Typical values are at T A = +25 C, unless otherwise specified.) (Note ) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS End-to-End Resistance R Figures, 2 7 3 kω Maximum Bandwidth f CUTOFF From 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 ±.25 db Tap-to-Tap Tolerance ±. db Total Harmonic Distortion Plus Noise THD+N = 5V, V = ( / 2) + V RMS, f = khz, tap = -6dB, V = / 2, R L = = 3V, V SS = V, V =.5V, V =.5V + V RMS, f = khz, R L = kω to ( / 2), C L = 5pF, tap = -6dB Channel-to-Channel Isolation - db Interchannel Matching f = 2Hz to 2kHz, 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..23 % Ratiometric Resistance Temperature Coefficient 5 ppm/ C Output Noise e n 2Hz to 2kHz.95 µv RMS PUSHBUTTON CONTACT INPUTS (UP/BAL, DN/BAL, MUTE, VOLUP, VOLDN, BAL, BAL, MODE) Internal Pullup Resistor R PULLUP 32 5 65 kω Single Pulse-Width Input t lpw Figure 5 22.5 ms Repetitive Input Pulse High Time t HPW Figure 5 4 ms Timeout Period t WS Click/pop suppression inactive 32 ms 2 Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued) MAX5456/MAX5457 ( = V LOGIC = +2.7V to +5.5V, V SS = V, GND = V, V =, V = V SS, T A = T MIN to T MAX. Typical values are at T A = +25 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 2.4 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 2.7 5.5 V Negative Power Supply V SS -2.7 V Supply-Voltage Difference - V SS 5.5 V Active Supply Current I DD (Note 2) µa V D D = + 5.5V, V S S = V, V LOGIC = 2.7V ( N ote 3) 2 Standby Supply Current I STBY V LOGIC = = +2.7V, V SS = -2.7V (Note 3).5 Shutdown Supply Current I SHDN (Note 4) µa Power-Up Time t PU ms Logic Standby Voltage V LOGIC 2.7 V Logic Active Supply Current I LOGIC (Note 2) 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 = 2.7V, I SINK = ma.4 Output Low Voltage V OL V LOGIC = 5.5V, I SINK = ma.2 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 2: 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 Maxim Integrated 3
Typical Operating Characteristics ( = V LOGIC = +2.7V 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 = +25 C, unless otherwise specified.) WIPER RESISTANCE (Ω) WIPER RESISTANCE vs. WIPER VOLTAGE 2 5 5 95 9 85 8 75 7 65 = V LOGIC = 5V 6.5..5 2. 2.5 3. 3.5 4. 4.5 5. WIPER VOLTAGE (V) MAX5456/7 toc ATTENUATION (db) - -2-3 -4-5 -6-7 ATTENUATION vs. TAP POSITION 4 8 2 6 2 24 28 32 TAP POSITION MAX5456/7 toc2 END-TO-END RESISTANCE CHANGE (%).5.4.3.2. -. -.2 -.3 -.4 END-TO-END RESISTANCE % CHANGE vs. TEMPERATURE -.5-4 -5 35 6 85 TEMPERATURE ( C) MAX5456/7 tpc3 ACTIVE SUPPLY CURRENT (µa) ACTIVE SUPPLY CURRENT vs. TEMPERATURE 22 25 2 25 2 95 9 = V LOGIC = 5.5V, I LOGIC + I VDD MAX5456/7 toc4 5V/div V/div WIPER SWITCHING TRANSIENT (TIMING OUT) V = V = MAX5456/7 toc5a VOLUP WIPER TRANSITION FROM -2dB to db 85 8-4 -5 35 6 85 TEMPERATURE ( C) ms/div 5V/div 2V/div WIPER SWITCHING TRANSIENT (SUPPRESSION CIRCUIT ACTIVE) V H _ = SQUARE WAVE FROM TO V SS, V L _ = / 2 MAX5456/7 toc5b VOLUP WIPER TRANSITION FROM -2dB to db LOGIC SUPPLY CURRENT (µa) 2 8 6 4 2 8 6 4 LOGIC SUPPLY CURRENT vs. LOGIC SUPPLY VOLTAGE ACTIVE LOGIC SUPPLY CURRENT MAX5456/7 toc6a 2 4ms/div 2.7 3.2 3.7 4.2 4.7 LOGIC SUPPLY VOLTAGE (V) 5.2 5.5 4 Maxim Integrated
Typical Operating Characteristics (continued) ( = V LOGIC = +2.7V 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 = +25 C, unless otherwise specified.) LOGIC SUPPLY CURRENT (µa).3.25.2.5..5 LOGIC SUPPLY CURRENT vs. LOGIC SUPPLY VOLTAGE STANDBY LOGIC SUPPLY CURRENT MAX5456/7 toc6b NOMINAL END-TO-END RESISTANCE (%RHL) 75 5 25 WIPER-TO-END TERMINAL RESISTANCE vs. TAP POSITION R WH R WL MAX5456/7 toc7 RESPONSE (db) 2-2 -4-6 FREQUENCY RESPONSE V = 2.5V ±V P-P, V = 2.5V, C = pf W_ SET TO db W_ SET TO -6dB MAX5456/7 toc8 2.7 3.2 3.7 4.2 4.7 LOGIC SUPPLY VOLTAGE (V) 5.2 5.5 8 6 24 32 TAP POSITION -8.. FREQUENCY (khz) THD+N (%) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY V = 2.5V ±V P-P, V = 2.5V, W_ SET TO -6dB, 2Hz TO 2kHz BANDPASS... LOAD = kω NO LOAD MAX5456/7 toc9 DIGITAL SUPPLY CURRENT (µa) 9 8 7 6 5 4 3 2 DIGITAL SUPPLY CURRENT vs. DIGITAL INPUT VOLTAGE MAX5456/7 toc PSRR (db) - -2-3 -4-5 -6-7 -8 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY = 5V ±V P-P, V = 5V, V = 2.5V, W_ SET TO -6dB MAX5456/7 toc.,, FREQUENCY (Hz) 2 3 4 5 DIGITAL INPUT VOLTAGE (V) -9 FREQUENCY (khz) LOGIC SUPPLY CURRENT (ma) 5 49 48 47 46 45 44 43 42 4 LOGIC SUPPLY CURRENT vs. TEMPERATURE V LOGIC = 5.5V ACTIVE LOGIC SUPPLY CURRENT 4-4 -5 35 6 85 TEMPERATURE ( C) MAX5456/7 toc2 NOISE (nvrms/ Hz) SPECTRAL NOISE DENSITY 9 8 7 6 5 4 3 2.. FREQUENCY (khz) MAX5456 toc3 Maxim Integrated 5
Pin Description MAX5457 PIN MAX5456 NAME FUNCTION 3 MODE 4 MODE_IND 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 balancecontrol mode. When the LED is off, the MAX5457 is in volume-control mode. See the Mode Indicator, MODE_IND section for more detail. 5 5 H Potentiometer High Terminal. H and L terminals can be reversed. 6 6 L Potentiometer Low Terminal. L and H terminals can be reversed. 7 7 W Potentiometer Wiper Terminal 8 8 SHDN Active-Low Shutdown Input. In shutdown mode, the MAX5456/MAX5457 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. 9 9 MUTE 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. Potentiometer Wiper Terminal L Potentiometer Low Terminal. L and H terminals can be reversed. 2 2 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 5 5 V LOGIC Digital Logic Power Supply. Bypass with.µf to ground. 6 6 Analog Power Supply. Bypass with.µf to ground. DN/BAL 2 UP/BAL 3 BAL 4 BAL VOLDN 2 VOLUP 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. 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 Maxim Integrated
Detailed Description The MAX5456/MAX5457 dual, logarithmic taper digital potentiometers feature a simple pushbutton interface that controls volume and balance in audio applications. Each potentiometer has 32 tap points and replaces mechanical potentiometers (see the Functional Diagrams). MAX5456 MAX5457 C H Up and Down Interface The MAX5456/MAX5457 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 2). 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_ C W R W Figure. Potentiometer Model (Active) MAX5456 MAX5457 R C L Volume Control In volume-control mode, the MAX5456/MAX5457s wipers move simultaneously, maintaining the balance separation between each wiper (Figure 3a). When either wiper reaches the maximum tap position (position closest to ), 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 ), 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 (-62dB 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 Figure 2. Potentiometer Model (Shutdown) Maxim Integrated 7
W PRESS VOLUP W PRESS VOLDN W TWICE ONCE BALANCE SEPARATION MAINTAINED (a) W W W PRESS VOLUP PRESS VOLUP ONCE NO CHANGE (b) (c) W W W PRESS VOLDN PRESS VOLDN ONCE TO 3d FROM 3c W PRESS VOLUP W PRESS VOLUP W ONCE ONCE ORIGINAL BALANCE SEPARATION MAINTAINED (d) Figure 3. Volume-Control Operation Table. Wiper Position and Attenuation POSITION ATTENUATION (db) 2 2 4 6 (POR) 2 3 6 3 62 32 (mute) >9 8 Maxim Integrated
Balance Control In balance-control mode, the MAX5456/MAX5457 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 22.5ms wide and separated by at least 4ms. Table 2. Wiper Action vs. Pushbutton Contact Duration CONTACT DURATION t < 22.5ms 22.5ms < t s s < t 4s t > 4s 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. W VOLUME LEVEL IS SET PRESS BAL W PRESS BAL W ONCE ONCE VOLUME LEVEL MAINTAINED BALANCE SHIFTS TO (a) VOLUME LEVEL MAINTAINED VOLUME LEVEL IS SET BY W BALANCE SHIFTS TO W PRESS BAL W PRESS BAL W ONCE ONCE (b) Figure 4. Balance-Control Operation Maxim Integrated 9
Click/Pop Suppression The click/pop suppression feature reduces the audible noise (clicks and pops) that result from wiper transitions. The MAX5456/MAX5457 minimize this noise by allowing the wiper position changes only when V = V. Thus, the wiper changes position only when the voltage at is the same as the voltage at the corresponding. Each wiper has its own suppression and timeout circuitry (see Figure 5a). The MAX5456/MAX5457 change wiper position after 32ms or when V = V L, whichever occurs first (see Figure 5b). The suppression circuitry monitors left and right channels separately. In volume-control mode, when the first wiper changes position, the second wiper has 32ms 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 -2dB. Power-on reset places the MAX5457 in volumecontrol mode. USER PRESSES PUSHBUTTON SWITCH SWITCH CONTACT CONTACT IS BOUNCING IS STABLE 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 2dB STEPS Figure 5a. Wiper Transition Timing Diagram Maxim Integrated
Shutdown, SHDN Upon entering shutdown mode, the MAX5456/MAX5457 store the last wiper settings. The wipers move to the end of the resistor string, and the end of the resistor string disconnects from the signal input. Terminating shutdown mode restores the wipers to their previous settings (see Figure 2). Shutdown does not affect the state of MODE_IND. Mute Function, MUTE The MAX5456/MAX5457 feature a mute function. Successive pulses on MUTE toggle its setting. Activating the mute 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 (-62dB 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 SWITCH CONTACT CONTACT IS BOUNCING IS STABLE 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 ) 2dB STEPS Figure 5b. Wiper Transition Timing Diagram Maxim Integrated
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 MAX5456/MAX5457 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 MAX5456/MAX5457 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. 2 Maxim Integrated
V LOGIC SHDN V LOGIC MODE_IND LEFT CHANNEL IN H H RIGHT CHANNEL IN L MAX5457 L / 2 / 2 W GND V SS MUTE UP/BAL DN/BAL MODE LEFT AUDIO INPUT RIGHT AUDIO INPUT MAX4494 INL- INL+ SHDN INR+ INR- MAX4494 S PGND MAX9722 OUTL OUTR STEREO HEADPHONE Figure 6. Volume/Balance Control Maxim Integrated 3
Typical Application Circuit (Single Supply) R LOAD = V PEAK / 2 R H R L V PEAK / 2 W_ V PEAK / 2 MAX5456/MAX5457 Typical Application Circuit (Dual Supplies) R LOAD = V PEAK V R H R L W_ V PEAK V V PEAK V MAX5456/MAX5457 V SS V SS = - 4 Maxim Integrated
Functional Diagrams V LOGIC SHDN H SHUTDOWN CLICK/POP SUPPRESSION CIRCUITRY MAX5456 CLICK/POP SUPPRESSION CIRCUITRY SHUTDOWN H 2 2 3 3 4 4 POSITION COUNTER POSITION COUNTER W UP/DN UP/DN 28 TIMING AND CONTROL 28 29 T F-F 29 DEBOUNCE DEBOUNCE DEBOUNCE DEBOUNCE DEBOUNCE V LOGIC 3 3 3 3 32 MUTE 32 MUTE L L V SS GND VOLUP VOLDN BAL BAL MUTE Maxim Integrated 5
Functional Diagrams (continued) V LOGIC SHDN MODE_IND H SHUTDOWN CLICK/POP SUPPRESSION CIRCUITRY MAX5457 CLICK/POP SUPPRESSION CIRCUITRY SHUTDOWN H 2 2 3 3 4 4 POSITION COUNTER POSITION COUNTER W UP/DN UP/DN 28 TIMING AND CONTROL 28 29 T F-F T F-F 29 DEBOUNCE DEBOUNCE DEBOUNCE DEBOUNCE 3 V LOGIC 3 3 3 32 MUTE 32 MUTE L L V SS GND DN/BAL UP/BAL MODE MUTE 6 Maxim Integrated
Pin Configurations (continued) TOP VIEW PROCESS: CMOS Chip Information VOLDN VOLUP BAL BAL H 2 3 4 5 + MAX5456 6 5 4 3 2 V LOGIC GND V SS H Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, #, or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. L W SHDN 6 7 8 9 L MUTE PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 6 QSOP E6+ 2-55 9-67 QSOP Maxim Integrated 7
REVISION NUMBER REVISION DATE DESCRIPTION Revision History PAGES CHANGED /4 Initial release 2 8/2 Update Ordering Information, Absolute Maximum Ratings, Pin Description, Pin Configuration. Removed Selector Guide and added Package Information table and Revision History., 2, 6, 4, 8 2 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 8 Maxim Integrated 6 Rio Robles, San Jose, CA 9534 USA -48-6- 22 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.