19-5141; Rev 1; 4/10 TION KIT EVALUA BLE IL AVA A Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Features The MAX5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer offers three end-to-end resistance values of 10kI, 50kI, and 100kI. Operating from a single +2.6V to +5.5V power supply, the device provides a low 35ppm/NC end-to-end temperature coefficient. The MAX5389 features an up/down interface. S Dual, 256-Tap Linear Taper Positions The small package size, low supply operating voltage, low supply current, and automotive temperature range of the MAX5389 make the device uniquely suited for the portable consumer market, battery backup industrial applications, and the automotive market. S Power-On Sets Wiper to Midscale The MAX5389 is specified over the automotive -40NC to +125NC temperature range and is available in a 14-pin TSSOP package. Applications Audio Mixing Mechanical Potentiometer Replacement Low-Drift Programmable Filters and Amplifiers S Single +2.6V to +5.5V Supply Operation S Low (< 1µA) Quiescent Supply Current S 10kI, 50kI, 100kI End-to-End Resistance Values S Up/Down Interface S -40°C to +125NC Operating Temperature Range Ordering Information PART PIN-PACKAGE END-TO-END RESISTANCE (kI) MAX5389LAUD+ 14 TSSOP 10 MAX5389MAUD+ 14 TSSOP 50 MAX5389NAUD+ 14 TSSOP 100 Note: All devices are specified over the -40NC to +125NC operating temperature range +Denotes a lead(Pb)-free/RoHS-compliant package. Adjustable Voltage References/Linear Regulators Programmable Delays and Time Constants Functional Diagram Automotive Electronics Low-Voltage Battery Applications HA VDD CSA LATCH INCA UDB INCB LA MAX5389 UDA CSB WA 256 DECODER U/D HB WB POR LB LATCH 256 DECODER GND ________________________________________________________________ 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. MAX5389 General Description MAX5389 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer ABSOLUTE MAXIMUM RATINGS Continuous Power Dissipation (TA = +70NC) 14-Pin TSSOP (derate 10mW/NC above +70NC).......796.8mW Operating Temperature Range......................... -40NC to +125NC Junction Temperature......................................................+150NC Storage Temperature Range............................. -65NC to +150NC Lead Temperature (soldering, 10s).................................+300NC Soldering Temperature (reflow).......................................+260NC VDD to GND ............................................................-0.3V to +6V H_, W_, L_ to GND.......................................-0.3V to the lower of (VDD + 0.3V) and +6V All Other Pins to GND..............................................-0.3V to +6V Continuous Current into H_, W_, and L_ MAX5389L.......................................................................... Q5mA MAX5389M......................................................................... Q2mA MAX5389N......................................................................... Q1mA 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 = +2.6V to +5.5V, VH__ = VDD, VL__ = GND, TA = -40NC to +125NC, unless otherwise noted. Typical values are at VDD = +5V, TA = +25NC.) (Note 1) PARAMETER Resolution SYMBOL CONDITIONS N MIN TYP MAX 256 UNITS Taps DC PERFORMANCE (Voltage-Divider Mode) Integral Nonlinearity INL (Note 2) -0.5 +0.5 LSB Differential Nonlinearity DNL (Note 2) -0.5 +0.5 LSB Dual Code Matching Register A = register B -0.5 +0.5 LSB Ratiometric Resistor Tempco (DVW/VW)/DT, no load Full-Scale Error Code = FFH Zero-Scale Error Code = 00H +5 MAX5389L -3 -2.5 MAX5389M -1 -0.5 MAX5389N -0.5 -0.25 LSB LSB MAX5389L +2.5 +3 MAX5389M +0.5 +1.0 MAX5389N +0.25 +0.5 MAX5389L ±1.0 ±2.5 LSB DC PERFORMANCE (Variable-Resistor Mode) (Note 3) VDD > +2.6V Integral Nonlinearity R-INL VDD > +4.75V MAX5389M ±0.5 ±1.0 MAX5389N ±0.25 ±0.8 MAX5389L ±0.4 ±1.5 MAX5389M ±0.3 ±0.75 ±0.25 ±0.5 MAX5389N Differential Nonlinearity R-DNL VDD ≥ 2.6V -0.5 +0.5 LSB LSB DC PERFORMANCE (Resistor Characteristics) Wiper Resistance (Note 4) Terminal Capacitance Wiper Capacitance RWL VDD > 2.6V 250 600 VDD > 4.75V 150 200 CH_, CL__ Measured to GND Measured to GND CW_ End-to-End Resistor Tempco TCR No load End-to-End Resistor Tolerance DRHL Wiper not connected 10 I pF 50 pF 35 ppm/NC -25 2 _______________________________________________________________________________________ +25 % Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer (VDD = +2.6V to +5.5V, VH__ = VDD, VL__ = GND, TA = -40NC to +125NC, unless otherwise noted. Typical values are at VDD = +5V, TA = +25NC.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS AC PERFORMANCE Crosstalk (Note 5) -90 MAX5389L -3dB Bandwidth BW Total Harmonic Distortion Plus Noise THD+N Wiper Settling Time (Note 6) tS dB 600 Code = 80H, 10pF load, MAX5389M VDD = +2.6V MAX5389N 150 kHz 75 Measured at W, VH_ = 1VRMS at 1kHz 0.015 MAX5389L 300 MAX5389M 1000 MAX5389N 2000 % ns POWER SUPPLIES Supply Voltage Range 2.6 VDD Digital inputs = VDD or GND Standby Current 5.5 1 V FA DIGITAL INPUTS Minimum Input High Voltage VIH Maximum Input Low Voltage VIL Input Leakage Current 70 % x VDD 30 -1 Input Capacitance +1 5 % x VDD FA pF TIMING CHARACTERISTICS (Note 7) Maximum INC_ Frequency 10 fMAX MHz CS to INC_ Setup Time tCI 25 ns CS to INC_ Hold Time tIC 0 ns INC_ Low Period tIL 25 ns INC_ High Period tIH 25 ns UD_ to INC_ Setup Time tDI 50 ns UD_ to INC_ Hold Time tID 0 ns Note 1: All devices are 100% production tested at TA = +25NC. Specifications over temperature limits are guaranteed by design and characterization. Note 2: DNL and INL are measured with the potentiometer configured as a voltage-divider (Figure 1) with H_ = VDD and L_ = 0V. The wiper terminal is unloaded and measured with a high-input-impedance voltmeter. Note 3: R-DNL and R-INL are measured with the potentiometer configured as a variable resistor (Figure 1). DNL and INL are measured with potentiometer configured as a variable resistor. H_ is unconnected and L_ = GND. For VDD = +5V, the wiper terminal is driven with a source current of 400µA for the 10kω configuration, 80µA for the 50kω configuration, and 40µA for the 100kω configuration. For VDD = +2.6V, the wiper terminal is driven with a source current of 200µA for the 10kω configuration, 40µA for the 50kω configuration, and 20µA for the 100kω configuration. Note 4: The wiper resistance is the worst value measured by injecting the currents given in Note 3 into W_ with L_ = GND. RW = (VW – VH)/IW. Note 5: Drive HA with a 1kHz, GND to VDD amplitude, tone. LA = LB = GND. No load. WB is at midscale with a 10pF load. Measure WB. Note 6: The wiper-settling time is the worst case 0 to 50% rise time, measured between tap 0 and tap 127. H_ = VDD, L_ = GND, and the wiper terminal is loaded with 10pF capacitance to ground. Note 7: Digital timing is guaranteed by design and characterization, not production tested. _______________________________________________________________________________________ 3 MAX5389 ELECTRICAL CHARACTERISTICS (continued) MAX5389 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer H N.C. W L W L Figure 1. Voltage-Divider and Variable Resistor Configurations Typical Operating Characteristics (VDD = +5V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE 0.6 0.5 0.4 VDD = 2.6V 0.3 0.2 0.8 0.7 100 VDD = 2.6V 0.6 0.5 0.4 10 0.3 0.2 1 0.1 0.1 0 TEMPERATURE (°C) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 DIGITAL INPUT VOLTAGE (V) RESISTANCE (W-TO-L) vs. TAP POSITION (10kI) RESISTANCE (W-TO-L) vs. TAP POSITION (50kI) -40 -25 -10 5 20 35 50 65 80 95 110 125 W-TO-L RESISTANCE (kΩ) 9 50 8 7 6 5 4 3 45 40 35 30 25 20 15 70 60 50 40 30 20 5 10 0 0 204 255 5.1 80 1 102 153 TAP POSITION 4.6 90 10 51 4.1 VDD (V) 100 2 0 3.6 110 RESISTANCE (W-TO-L) (kI) 10 3.1 RESISTANCE (W-TO-L) vs. TAP POSITION (100kI) MAX5389 toc05 55 MAX5389 toc04 11 2.6 MAX5389 toc06 0.1 0 W-TO-L RESISTANCE (kΩ) MAX5389 toc03 0.9 IDD (µA) 0.7 1000 SUPPLY CURRENT (µA) VDD = 5V VDD = 5V 1.0 MAX5389 toc02 0.9 SUPPLY CURRENT (µA) 10,000 MAX5389 toc01 1.0 0.8 SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY CURRENT vs. DIGITAL INPUT VOLTAGE 0 0 51 102 153 TAP POSITION 204 255 0 51 102 153 TAP POSITION 4 _______________________________________________________________________________________ 204 255 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer END-TO-END RESISTANCE % CHANGE vs. TEMPERATURE 150 VDD = 5V 130 110 90 MAX5389 toc09 0.06 0.04 -0.1 50kI -0.2 100kI -0.3 0.02 0 -0.02 -0.04 -0.06 -0.4 -0.08 -0.10 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (NC) TAP POSITION VARIABLE-RESISTOR DNL vs. TAP POSITION (50kI) VARIABLE-RESISTOR DNL vs. TAP POSITION (100kI) VARIABLE-RESISTOR INL vs. TAP POSITION (10kI) 0.06 IWIPER = 400µA 0.08 1.0 0.06 0.2 INL (LSB) 0.4 0.02 DNL (LSB) 0.04 -0.02 -0.02 -0.04 -0.4 -0.06 -0.6 -0.08 -0.08 -0.8 -0.10 -0.10 153 204 -1.0 0 51 102 153 204 255 0 102 153 204 TAP POSITION TAP POSITION VARIABLE-RESISTOR INL vs. TAP POSITION (50kI) VARIABLE-RESISTOR INL vs. TAP POSITION (100kI) VOLTAGE-DIVIDER DNL vs. TAP POSITION (10kI) IWIPER = 400µA 0.4 0.10 0.3 0.08 0.06 0.04 0.1 0.1 0.02 0 -0.1 DNL (LSB) 0.2 INL (LSB) 0.2 0 -0.1 0 -0.02 -0.2 -0.2 -0.04 -0.3 -0.3 -0.06 -0.4 -0.4 -0.08 -0.5 -0.5 51 102 153 TAP POSITION 204 255 255 MAX5389 toc15 0.5 MAX5389 toc14 0.3 0 51 TAP POSITION IWIPER = 80µA 0.4 255 MAX5389 toc13 0.5 102 255 0 -0.06 51 204 -0.2 -0.04 0 153 0.6 0.02 0 102 IWIPER = 400µA 0.8 0.04 0 51 MAX5389 toc12 0.10 0 MAX5389 toc11 IWIPER = 80µA 0.08 DNL (LSB) 0 IWIPER = 400µA 0.08 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 WIPER VOLTAGE (V) 0.10 INL (LSB) 0.10 -0.5 MAX5389 toc10 70 10kI DNL (LSB) 170 0.1 END-TO-END RESISTANCE % CHANGE VDD = 2.6V 190 WIPER RESISTANCE (Ω) MAX5389 toc07 210 VARIABLE-RESISTOR DNL vs. TAP POSITION (10kI) MAX5389 toc08 WIPER RESISTANCE vs. WIPER VOLTAGE (10kI) -0.10 0 51 102 153 TAP POSITION 204 255 0 51 102 153 204 255 TAP POSITION _______________________________________________________________________________________ 5 MAX5389 Typical Operating Characteristics (continued) (VDD = +5V, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VDD = +5V, TA = +25°C, unless otherwise noted.) 0.06 VOLTAGE-DIVIDER INL vs. TAP POSITION (10kI) 0.5 MAX5389 toc17 0.08 0.08 0.06 0.4 0.3 0.04 0.2 0.02 0.02 0.1 0 -0.02 INL (LSB) 0.04 DNL (LSB) 0 -0.02 0 -0.1 -0.04 -0.04 -0.2 -0.06 -0.06 -0.3 -0.08 -0.08 -0.4 -0.10 -0.10 0 51 102 153 204 255 -0.5 0 51 102 153 204 255 51 102 153 204 255 TAP POSITION TAP POSITION VOLTAGE-DIVIDER INL vs. TAP POSITION (50kI) VOLTAGE-DIVIDER INL vs. TAP POSITION (100kI) TAP-TO-TAP SWITCHING TRANSIENT (CODE 127 TO 128) 10kI 0.5 MAX5389 toc19 0.5 0.4 0.3 0.4 0.3 0.2 0.1 0.1 INL (LSB) 0.2 0 -0.1 -0.2 -0.3 -0.4 -0.4 INC 5V/div -0.5 51 102 153 TAP POSITION 204 255 VW-L 20mV/div 0 -0.3 -0.5 MAX5389 toc21 -0.1 -0.2 0 0 TAP POSITION MAX5389 toc20 DNL (LSB) 0.10 MAX5389 toc16 0.10 VOLTAGE-DIVIDER DNL vs. TAP POSITION (100kI) MAX5389 toc18 VOLTAGE-DIVIDER DNL vs. TAP POSITION (50kI) INL (LSB) MAX5389 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer 0 51 102 153 204 255 400ns/div TAP POSITION 6 _______________________________________________________________________________________ Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer TAP-TO-TAP SWITCHING TRANSIENT (CODE 127 TO 128) 50kI TAP-TO-TAP SWITCHING TRANSIENT (CODE 127 TO 128) 100kI MAX5389 toc22 POWER-ON WIPER TRANSIENT (CODE 0 TO 128) MAX5389 toc23 MAX5389 toc24 VW-L 20mV/div VW-L 20mV/div OUTPUT W 2V/div INC 5V/div 400ns/div 1µs/div 2µs/div MIDSCALE FREQUENCY RESPONSE CROSSTALK vs. FREQUENCY TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY CROSSTALK (dB) GAIN (dB) MAX5389L -10 MAX5389M MAX5389L -40 MAX5389N -80 MAX5389N MAX5389M -120 -30 -140 0.01 0.1 1 10 100 FREQUENCY (kHz) 1,000 10,000 0.01 0.1 1 10 FREQUENCY (kHz) 100 MAX5389M 0.10 -60 -100 -20 0.12 MAX5389 toc27 -20 0 0.14 THD+N (%) VIN = 1VP-P CW = 10pF MAX5389 toc26 0 MAX5389 toc25 10 VDD 2V/div INC 5V/div 1000 0.08 MAX5389N 0.06 0.04 MAX5389L 0.02 0 0.01 0.10 1 10 100 FREQUENCY (kHz) _______________________________________________________________________________________ 7 MAX5389 Typical Operating Characteristics (continued) (VDD = +5V, TA = +25°C, unless otherwise noted.) Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer MAX5389 Pin Configuration TOP VIEW CSA 1 + 14 CSB UDA 2 13 INCA UDB 3 12 INCB VDD 4 MAX5389 11 GND WA 5 10 WB HA 6 9 HB LA 7 8 LB Pin Description PIN NAME 1 CSA Active-Low Register A Chip-Select Input. Drive CSA low to change wiper position WA through INCA and UDA. FUNCTION 2 UDA Register A Up/Down Control Input. With UDA low, a high-to-low transition at INCA decrements the WA position towards LA. With UDA high, a high-to-low transition at INCA increments WA position toward HA. 3 UDB Register B Up/Down Control Input. With UDB low, a high-to-low transition at INCB decrements the WB position towards LB. With UDB high, a high-to-low transition at INCB increments WB position toward HB. 4 VDD Power-Supply Input. Bypass VDD to GND with a 0.1FF capacitor close to the device. 5 WA Resistor A Wiper Terminal 6 HA Resistor A High Terminal. The voltage at HA can be higher or lower than the voltage at LA. Current can flow into or out of HA. 7 LA Resistor A Low Terminal. The voltage at LA can be higher or lower than the voltage at HA. Current can flow into or out of LA. 8 LB Resistor B Low Terminal. The voltage at LB can be higher or lower than the voltage at HB. Current can flow into or out of LB. 9 HB Resistor B High Terminal. The voltage at HB can be higher or lower than the voltage at LB. Current can flow into or out of HB. 10 WB Resistor B Wiper Terminal 11 GND Ground 12 INCB Register B Wiper Increment Control Input. With UDB low, a high-to-low transition at INCB decrements the WB position towards LB. With UDB high, a high-to-low transition at INCB increments WB position toward HB. 13 INCA Register A Wiper Increment Control Input. With UDA low, a high-to-low transition at INCA decrements the WA position towards LA. With UDA high, a high-to-low transition at INCA increments WA position toward HA. 14 CSB Active-Low Register B Chip-Select Input. Drive CSB low to change wiper position WA through INCB and UDB. 8 _______________________________________________________________________________________ Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer The MAX5389 dual, 256-tap, volatile, low-voltage linear taper digital potentiometer offers three end-to-end resistance values of 10kI, 50kI, and 100kI. The potentiometer consists of 255 fixed resistors in series between terminals H_ and L_. The potentiometer wiper, W_, is programmable to access any one of the 256 tap points on the resistor string. On power-up, the wiper position is set to midscale (tap 128). and moves the tap point, W_ closer to L_, (Figure 2). The wiper performs a make-before-break transition ensuring that W_ is never disconnected from the resistor string during a transition from one tap point to another. When the wiper is at either end of the resistor array additional transitions in the direction of the end point do not change the counter value. Table 1. Up/Down Control Table The potentiometers are programmable independent of each other. The MAX5389 features an up/down interface. Up/Down Interface Logic inputs CS_, UD_, and INC_ determine the wiper position of the device (Table 1). With CS_ low and UD_ high, a high-to-low (falling edge) transition on INC_ increments the internal counter which moves the wiper, W_, closer to H_. When both CS_ and UD_ are low, the falling edge of INC_ decrements the internal counter UD_ CS_ H W_ L L INC_ X á L H á No change L L â Decrement L H â Increment X No change No change X = Don’t care. ↑ = Low-to-high transition. ↓ = High-to-low transition. CS_ tCI tIC tIL INC_ tIH tDI UD_ tID tIW W_ Figure 2. Up/Down Interface Timing Diagram _______________________________________________________________________________________ 9 MAX5389 Detailed Description MAX5389 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Applications Information Variable Gain Amplifier Figure 3 shows a potentiometer adjusting the gain of a noninverting amplifier. Figure 4 shows a potentiometer adjusting the gain of an inverting amplifier. Adjustable Dual Linear Regulator Figure 5 shows an adjustable dual linear regulator using a dual potentiometer as two variable resistors. Adjustable Voltage Reference Figure 6 shows an adjustable voltage reference circuit using a potentiometer as a voltage-divider. VOUT1 OUT1 VOUT2 OUT2 VIN H VOUT V+ W L IN W W L SET1 H H MAX8866 L SET2 Figure 3. Variable Gain Noninverting Amplifier Figure 5. Adjustable Dual Linear Regulator +5V H IN L VREF OUT H W MAX6160 VIN W VOUT GND Figure 4. Variable Gain Inverting Amplifier L Figure 6. Adjustable Voltage Reference 10 ������������������������������������������������������������������������������������� Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer LCD Bias Control Figure 8 shows a positive LCD bias control circuit using a potentiometer as a voltage-divider. Programmable Filter Figure 10 shows a programmable filter using a dual potentiometer. Offset Voltage Adjustment Circuit Figure 11 shows an offset voltage adjustment circuit using a dual potentiometer. Figure 9 shows a positive LCD bias control circuit using a potentiometer as a variable resistor +5V R3 H W H R2 R1 W IS L VOUT VOUT L VOUT = IS x ((R3 x (1 + R2/R1)) + R2) Figure 7. Variable Gain I-to-V Converter Figure 9. Positive LCD Bias Control Using a Variable Resistor WB VIN +5V LB HB H VOUT R3 W R1 VOUT HA L R2 WA LA Figure 8. Positive LCD Bias Control Using a Voltage-Divide Figure 10. Programmable Filter ______________________________________________________________________________________ 11 MAX5389 Variable Gain Current to Voltage Converter Figure 7 shows a variable gain current to voltage converter using a potentiometer as a variable resistor. MAX5389 Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer Process Information +5V PROCESS: BiCMOS WA LA HA Package Information VOUT HB WB For the latest package outline information and land patterns, go to www.maxim-ic.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. PACKAGE TYPE PACKAGE CODE Document No. 14 TSSOP U14+1 21-0066 LB Figure 11. Offset Voltage Adjustment Circuit 12 ������������������������������������������������������������������������������������� Dual, 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometer REVISION NUMBER REVISION DATE 0 1/10 Initial release 1 4/10 Added Soldering Temperature in Absolute Maximum Ratings; corrected code in Conditions of -3dB Bandwidth specification in Electrical Characteristics; corrected Table 1 and Figure 5 DESCRIPTION PAGES CHANGED — 2, 3, 9, 10 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 © 2010 Maxim Integrated Products 13 Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX5389 Revision History