MAX5456

The MAX5457 features a 3-button interface with a MODE input that toggles between volumeand 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 provide temperature coefficients of 50ppm/°C end-to-end and 5ppm/°C ratiometric and a nominal resistance of 10kper 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 0.01%. 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 MAX5408-MAX5411 data sheet for SPITM versions of the MAX5456/ MAX5457. The MAX5456/MAX5457 advance the wiper setting once per button push. Maxim's proprietary SmartWipercontrol eliminates the need for a microcomputer to increase the wiper transition rate. Holding the control input low for more than 1s advances the wiper at a rate of 4Hz for 4s and 16Hz per second thereafter. The MAX5456/MAX5457 are available in 16-pin QSOP and 16-pin TQFN packages and are specified over the extended (-40°C to +85°C)temperature range. Use the MAX5456/MAX5457 digital inputs with momentary contact single-pole/single-throw (SPST)pushbutton switches. Each input includes internal debounce circuitry and a 50k pullup resistor.

The features of MAX5456 can be summarized as (1)smartwiper control provides accelerated wiper motion; (2)debounced pushbutton interface with internal pullup resistors; (3)logarithmic taper with 2dB steps between taps; (4)single +2.7V to +5.5V or dual ±2.7V supply operation; (5)low 0.5A standby supply current; (6)clickless switching; (7)10k end-to-end fixed resistance value; (8)mute function to -90dB (typ); (9)power-on reset to -12dB wiper position; (10)32 tap positions for each wiper; (11)small 16-pin QSOP/TQFN packages.

The absolute maximum ratings of MAX5456 are (1)(MAX5456)SHDN, MUTE, VOLUP, VOLDN, BAL_ to GND: -0.3V to (VLOGIC + 0.3V); (2)(MAX5457)SHDN, MUTE, UP/BAL1, DN/BAL0, MODE, MODE_IND to GND: -0.3V to (VLOGIC + 0.3V); (3)H_, L_, and W_ to VS: -0.3V to (VDD + 0.3 V); (4)VDD to GND: -0.3V to +6V; (5)VDD to VSS: -0.3V to +6V; (6)VLOGIC to GND: -0.3V to +6V; (7)VLOGIC to VSS: -0.3V to +6V; (8)VSto GND: -3.0V to +0.3V; (9)peak current into H_, L_, and W_: ±1mA; (10)average current into H_, L_, and W_: ±500A; (11)input and output latchup immunity: ±200mA; (12)continuous power dissipation (TA = +70°C)16-Pin QSOP (derate 8.3mW/°C above +70°C): 666.7mW / 16-pin TQFN (derate 16.9mW/°C above +70°C): 1349.1mW; (13)operating temperature range: -40°C to +85°C; (14)junction temperature: +150°C; (15)storage temperature range: -60°C to +150°C; (16)lead temperature (soldering, 10s): +300°C.