MAX5128 19-3929 Rev 2 6/07 128-Tap, Nonvolatile, Linear-Taper Digital Potentiometer in 2mm x 2mm DFN Package General Description Features The MAX5128 nonvolatile, single, linear-taper, digital Ultra-Small, 2mm x 2mm, 8-Pin DFN Package potentiometer performs the function of a mechanical Power-On Recall of Wiper Position from potentiometer, but replaces the mechanics with a sim- Nonvolatile Memory ple 2-wire digital interface. The MAX5128 performs the same function as a discrete potentiometer or variable 22k End-to-End Resistance resistor and features 128 taps and 22k end-to-end 128 Tap Positions resistance. The MAX5128 also features an ultra-small, 2mm x 2mm DFN package and low 0.5A (typ) stand- 5ppm/C Ratiometric Temperature Coefficient by supply current, making this device ideal for portable 1.5A (max) Standby Supply Current applications. The MAX5128 operates from a +2.7V to +5.25V power supply. An integrated nonvolatile memo- +2.7V to +5.25V Single Supply Operation ry recalls the programmed wiper position of the digital potentiometer. A simple 2-wire up/down interface pro- 80,000 Wiper Store Cycles grams the wiper position. The digital potentiometer pro- 50-Year Wiper Data Retention vides a low 5ppm/C ratiometric temperature coefficient and is specified over the extended -40C to +85C tem- perature range. Applications Ordering Information V Adjustment for LCD Panels COM TEMP PIN - TOP PKG PART Backlight Adjustment RANGE PAC K A G E MARK CODE LED Bias Adjustment M AX 5128ELA + -40C to +85C 8 DFN AAF L822-1 +Denotes a lead-free package. Power-Supply Modules Fiber-Module Bias Setting Bias Setting for Radios Portable Consumer Electronics Functional Diagram H V CC POR 7-BIT NV MEMORY 128-POSITION W 7 128 GND DECODER TAPS L 7 UP SERIAL INTERFACE DN MAX5128 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE128-Tap, Nonvolatile, Linear-Taper Digital Potentiometer in 2mm x 2mm DFN Package ABSOLUTE MAXIMUM RATINGS V to GND...........................................................-0.3V to +6.0V Operating Temperature Range ...........................-40C to +85C CC UP and DN to GND ....................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C CC H, L, and W to GND....................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C CC Maximum Continuous Current into H, L, and W ..............0.5mA Lead Temperature (soldering, 10s) .................................+300C Maximum Continuous Current into All Other Pins ............50mA Continuous Power Dissipation (T = +70C) A 8-Pin DFN (derate 4.7mW/C above +70C) ........376.5mW 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 = +2.7V to +5.25V, H = V , L = GND, T = -40C to +85C. Typical values are at V = +5.0V, T = +25C, unless otherwise noted.) CC CC A CC A (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC PERFORMANCE (voltage-divider mode) Resolution N 7 Bits Integral Nonlinearity INL (Note 2) 1.0 LSB Differential Nonlinearity DNL (Note 2) 1.0 LSB End-to-End Resistance TC 50 ppm/C R Temperature Coefficient Ratiometric Resistance 5 ppm/C Temperature Coefficient Full-Scale Error FSE -3 0 LSB Zero-Scale Error ZSE 0 +2 LSB DC PERFORMANCE (variable-resistor mode) Integral Nonlinearity INL (Note 3) 1.75 LSB Differential Nonlinearity DNL (Note 3) 1 LSB DC PERFORMANCE (resistor characteristics) Wiper Resistance R (Note 4) 0.6 0.8 k W Wiper Capacitance C 20 pF W End-to-End Resistance R 16 22 27 k HL DIGITAL INPUTS (UP, DN) 3.4V V 5.25V 2.4 CC Input-High Voltage (Note 5) V V IH 0.7 x 2.7V V < 3.4V CC V CC Input-Low Voltage V (Note 5) V IL 0.8 Input Leakage Current I 1 A IN Input Capacitance C 5pF IN DYNAMIC CHARACTERISTICS Wiper -3dB Bandwidth f (Note 6) 400 kHz 3dB V = 0.3V , f = 1kHz, wiper set to H RMS THD Plus Noise THD+N 0.02 % midscale 2 MAX5128