19-1943; Rev 0; 1/01 Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP Features ♦ 14-Pin TSSOP Small-Footprint Package ♦ 256 Tap Positions ♦ Ultra-Low 0.1µA Supply Current ♦ +2.7V to +5.5V Single-Supply Operation ♦ Two Independent Potentiometers in a Package ♦ Low End-to-End Temperature Coefficient 35ppm/°C ♦ Low Ratiometric Temperature Coefficient 5ppm/°C ♦ Power-On Reset: Wiper Goes to Midscale (Position 128) ♦ Glitchless Switching Between Resistor Taps ♦ 3-Wire SPI™-Interface Compatible ♦ 10kΩ/50kΩ/100kΩ Resistor Values Ordering Information Applications Mechanical Potentiometer Replacement PART TEMP. RANGE PIN-PACKAGE R (kΩ) Low-Drift Programmable Gain Amplifier (PGA) MAX5413EUD -40°C to +85°C 14 TSSOP 10 Volume Control MAX5414EUD -40°C to +85°C 14 TSSOP 50 LCD Screen Adjustment MAX5415EUD -40°C to +85°C 14 TSSOP 100 Adjustable Voltage Reference Programmable Filters, Delays, Time Constant Pin Configuration Impedance Matching TOP VIEW GND 1 14 LA LB 2 13 HA HB 3 12 WA WB 4 N.C. 5 SPI is a trademark of Motorola, Inc. MAX5413 MAX5414 MAX5415 11 VDD 10 N.C. N.C. 6 9 SCLK CS 7 8 DIN TSSOP ________________________________________________________________ Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. MAX5413/MAX5414/MAX5415 General Description The MAX5413/MAX5414/MAX5415 is a family of dual linear taper digital potentiometers. Each device has two 3-terminal potentiometers. The MAX5413/MAX5414/ MAX5415 operate from +2.7V to +5.5V single-supply voltages and use an ultra-low 0.1µA supply current. These devices also provide glitchless switching between resistor taps, as well as a convenient poweron reset (POR) that sets the wiper to the midscale position at power-up. Each potentiometer consists of a fixed resistor with a wiper contact that is digitally controlled through a 3-wire serial interface and has 256 tap points. It performs the same function as a discrete potentiometer or variable resistor. These parts are ideal for applications requiring digitally controlled resistors. Three resistance values are available: 10kΩ (MAX5413), 50kΩ (MAX5414), and 100kΩ (MAX5415). A nominal resistor temperature coefficient of 35ppm/°C end-to-end and 5ppm/°C ratiometric make the MAX5413/MAX5414/MAX5415 ideal for applications requiring low temperature-coefficient variable resistors, such as adjustable-gain circuit configurations. The MAX5413/MAX5414/MAX5415 are available in a 14pin TSSOP package. Each device is guaranteed over the extended industrial temperature range (-40°C to +85°C). MAX5413/MAX5414/MAX5415 Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V DIN, SCLK, CS .........................................................-0.3V to +6V HX, LX, WX to GND ........................................-0.3V to (VDD +0.3) Maximum Continuous Current into HX, LX, and WX............±1mA Continuous Power Dissipation (TA = +70°C) 14-Pin TSSOP (derate 9.1mW/°C above +70°C) .........727mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°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 (VDD = +5V, unless otherwise noted. VH = VDD, VL = 0, TA = TMIN to TMAX. Typical values are at VDD = +5V, TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC PERFORMANCE (Voltage-Divider Mode) Resolution N 8 Bits Integral Nonlinearity (Notes 1, 2) INL ±1/2 Differential Nonlinearity (Notes 1, 2) DNL ±1/2 End-to-End Resistor Tempco TCR Ratiometric Resistor Tempco Full-Scale Error Zero-Scale Error LSB LSB 35 ppm/°C 5 ppm/°C MAX5413 -8 MAX5414 -1.6 MAX5415 0.8 MAX5413 +8 MAX5414 +1.6 MAX5415 +0.8 LSB LSB DC PERFORMANCE (Variable-Resistor Mode) Resolution N 8 Bits ±1 VDD = +5V Integral Nonlinearity (Notes 1, 3) Differential Nonlinearity (Notes 1, 3) INL VDD = +3V DNL MAX5413 ±3 MAX5414 ±1.5 MAX5415 ±1.5 VDD = +5V ±1/2 VDD = +3V LSB LSB LSB DC PERFORMANCE (Resistor Characteristics) Wiper Resistance (Note 4) RW Wiper Capacitance CW End-to-End Resistance RHL 2 VDD = +5V 275 VDD = +3V 550 MAX5413 50 MAX5414/MAX5415 30 pF MAX5413 7.5 10 12.5 MAX5414 37.5 50 62.5 MAX5415 75 100 125 _______________________________________________________________________________________ Ω kΩ Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP (VDD = +5V, unless otherwise noted. VH = VDD, VL = 0, TA = TMIN to TMAX. Typical values are at VDD = +5V, TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL INPUTS Input High Voltage VIH Input Low Voltage VIL 0.7 x VDD V Input Leakage Current Input Capacitance 0.3 x VDD V ±1.0 µA 5 pF TIMING CHARACTERISTICS (ANALOG) Wiper-Settling Time tS MAX5413 100 MAX5414 325 MAX5415 650 ns TIMING CHARACTERISTICS (DIGITAL) (Note 5) Maximum SCLK Frequency 10 MHz SCLK Clock Period tCP 100 ns SCLK Pulse Width High tCH 40 ns SCLK Pulse Width Low tCL 40 ns CS Fall to SCLK Rise Setup Time tCSS 40 ns SCLK Rise to CS Rise Hold Time tCSH 0 ns DIN Setup Time tDS 40 ns DIN Hold Time tDH 0 ns SCLK Rise to CS Fall Delay tCS0 10 ns CS Rise to SCLK Rise Hold tCS1 40 ns CS Pulse Width High tCSW 100 ns POWER SUPPLIES Supply Voltage Supply Current VDD IDD 2.7 CS = SCLK = DIN = VDD VDD = +5V 0.8 VDD = +2.7V 0.1 5.5 V 5 µA µA Note 1: Linearity is defined in terms of the HX to LX code-dependent resistance. Note 2: The DNL and INL are measured with the potentiometer configured as a voltage-divider with HX = VDD and LX = 0. The wiper terminal is unloaded and measured with an ideal voltmeter. Note 3: The DNL and INL are measured with the potentiometer configured as a variable resistor. HX is unconnected and LX = 0. At 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. At VDD = +3V, 200µA/40µA/20µA for 10kΩ/50kΩ/100kΩ configurations, respectively. Note 4: The wiper resistance is the worst value measured by injecting into WX, a current IW = VDD / RHL. Note 5: Digital timing is guaranteed by design. _______________________________________________________________________________________ 3 MAX5413/MAX5414/MAX5415 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (VDD = +5.0V, TA = +25°C, unless otherwise noted.) 240 220 VDD = +5V 200 VDD = +3V 320 300 280 VDD = +5V 260 240 220 180 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 320 300 280 260 240 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 WIPER VOLTAGE (V) WIPER RESISTANCE vs. INPUT CODE (10kΩ) WIPER RESISTANCE vs. INPUT CODE (50kΩ) WIPER RESISTANCE vs. INPUT CODE (100kΩ) 6 5 4 3 90 W-TO-L RESISTANCE (kΩ) 40 35 30 25 20 15 80 70 60 50 40 30 2 10 20 1 5 10 0 0 64 96 128 160 192 224 256 0 0 32 64 96 128 160 192 224 256 0 32 64 96 128 160 192 224 256 INPUT CODE (DECIMAL) INPUT CODE (DECIMAL) INPUT CODE (DECIMAL) VARIABLE RESISTOR DNL vs. INPUT CODE (10kΩ) VARIABLE RESISTOR INL vs. INPUT CODE (10kΩ) VARIABLE RESISTOR DNL vs. INPUT CODE (50kΩ) 0.40 0.05 0.04 0.05 0.20 DNL (LSB) INL (LSB) 0.30 0.10 0.10 0.00 -0.20 128 160 192 224 256 INPUT CODE (DECIMAL) 0.01 VDD = +5V -0.02 -0.03 -0.30 96 0.02 -0.01 0.00 64 0.03 0.00 -0.10 -0.05 MAX5413 toc09 0.15 0.06 MAX5413 toc08 0.50 MAX5413 toc07 0.20 32 MAX5413 toc06 45 W-TO-L RESISTANCE (kΩ) 7 100 MAX5413 toc05 50 MAX5413 toc04 8 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 WIPER VOLTAGE (V) 9 32 VDD = +5V WIPER VOLTAGE (V) 10 0 VDD = +3V 180 160 160 0 360 340 220 200 200 160 4 400 380 MAX5413 toc02 340 180 W-TO-L RESISTANCE (kΩ) WIPER RESISTANCE vs. WIPER VOLTAGE (100kΩ) WIPER RESISTANCE (Ω) VDD = +3V 260 360 WIPER RESISTANCE (Ω) 280 WIPER RESISTANCE (Ω) 380 MAX5413 toc01 300 WIPER RESISTANCE vs. WIPER VOLTAGE (50kΩ) MAX5413 toc03 WIPER RESISTANCE vs. WIPER VOLTAGE (10kΩ) DNL (LSB) MAX5413/MAX5414/MAX5415 Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP 0 32 64 96 128 160 192 224 256 INPUT CODE (DECIMAL) 0 32 64 96 128 160 192 224 256 INPUT CODE (DECIMAL) _______________________________________________________________________________________ Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP VARIABLE RESISTOR INL vs. INPUT CODE (50kΩ) DNL (LSB) -0.04 -0.06 -0.08 -0.10 -0.12 -0.14 -0.16 0 32 64 96 -0.20 0 32 96 128 160 192 224 256 0 0.10 0.02 160 192 224 0.07 0.06 256 0.05 0.00 -0.05 0.04 0.03 0.02 0.01 -0.10 0.00 128 0.08 DNL (LSB) INL (LSB) 0.03 96 VOLTAGE-DIVIDER DNL vs. INPUT CODE (50kΩ) 0.05 0.04 64 INPUT CODE (DECIMAL) MAX5413 toc14 0.15 0.01 0.00 -0.15 -0.01 -0.01 -0.20 -0.02 0 32 64 96 128 160 192 224 256 -0.02 0 32 INPUT CODE (DECIMAL) 128 160 192 224 256 0 32 0.08 0.07 0.06 0.05 0.03 0.02 256 0.10 0.00 -0.05 -0.10 0.00 -0.15 160 192 224 0.05 0.04 0.01 -0.10 128 0.15 INL (LSB) DNL (LSB) -0.05 96 VOLTAGE-DIVIDER INL vs. INPUT CODE (100kΩ) 0.05 0.00 64 INPUT CODE (DECIMAL) MAX5413 toc17 0.10 96 VOLTAGE-DIVIDER DNL vs. INPUT CODE (100kΩ) MAX5413 toc16 0.15 64 INPUT CODE (DECIMAL) VOLTAGE-DIVIDER INL vs. INPUT CODE (50kΩ) INL (LSB) 32 VOLTAGE-DIVIDER INL vs. INPUT CODE (10kΩ) 0.05 DNL (LSB) 64 INPUT CODE (DECIMAL) MAX5413 toc13 0.06 -0.05 -0.15 VOLTAGE-DIVIDER DNL vs. INPUT CODE (10kΩ) 0.07 0.00 -0.10 INPUT CODE (DECIMAL) 0.08 MAX5413 toc12 0.05 0.05 0.04 0.03 0.02 0.01 0.00 -0.01 -0.02 128 160 192 224 256 0.10 MAX5413 toc18 INL (LSB) -0.02 0.15 MAX5413 toc15 0.00 0.11 0.10 0.09 0.08 0.07 0.06 INL (LSB) 0.02 VARIABLE RESISTOR INL vs. INPUT CODE (100kΩ) MAX5413 toc11 0.12 MAX5413 toc10 0.04 VARIABLE RESISTOR DNL vs. INPUT CODE (100kΩ) -0.15 -0.01 -0.20 -0.20 -0.02 0 32 64 96 128 160 192 224 INPUT CODE (DECIMAL) 256 0 32 64 96 128 160 192 224 INPUT CODE (DECIMAL) 256 0 32 64 96 128 160 192 224 256 INPUT CODE (DECIMAL) _______________________________________________________________________________________ 5 MAX5413/MAX5414/MAX5415 Typical Operating Characteristics (continued) (VDD = +5.0V, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VDD = +5.0V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. LOGIC INPUT VOLTAGE MAX5413 toc19 VDD = +5V 0.1 0.01 VDD = +3V VDD = +5V 0.8 SUPPLY CURRENT (µA) 1 SUPPLY CURRENT (mA) 1.0 MAX5413 toc20 SUPPLY CURRENT vs. TEMPERATURE 10 0.6 0.4 VDD = +3V 0.2 0.001 0.0001 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0.0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 INPUT LOGIC VOLTAGE (V) TEMPERATURE (°C) TAP-TO-TAP SWITCHING TRANSIENT (CODE 127 TO 128) END-TO-END RESISTANCE % CHANGE vs. TEMPERATURE 10kΩ 0.15 50kΩ 0.10 0.05 100kΩ 0 50kΩ -0.05 VW-L 10mV/div 100kΩ -0.10 -0.15 -0.20 10kΩ CS 5V/div -0.25 -40 -20 0 20 40 TEMPERATURE (°C) 6 MAX5413 toc22 MAX5413 toc21 0.20 END-TO-END RESISTANCE % CHANGE MAX5413/MAX5414/MAX5415 Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP 60 80 200ns/div _______________________________________________________________________________________ Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP PIN NAME FUNCTION 1 GND 2 LB Low Terminal of Resistor B 3 HB High Terminal of Resistor B Wiper Terminal of Resistor B Ground 4 WB 5, 6, 10 N.C. 7 CS SPI Chip Select 8 DIN SPI Serial Data Input 9 SCLK 11 VDD Power Supply, +2.7V to +5.5V. Connect a 0.1µF capacitor to GND. 12 WA Wiper Terminal of Resistor A 13 HA High Terminal of Resistor A 14 LA Low Terminal of Resistor A No Connection to this Terminal SPI Clock Input POR MAX5413 MAX5414 MAX5415 VDD GND HA R DIN 9-BIT SHIFT REGISTER 8 R 8-BIT LATCH 8 256 DECODE WA LA HB R 8-BIT LATCH SCLK CS 8 256 DECODE WB LB SR DECODE Figure 1. MAX5413/MAX5414/MAX5415 Functional Diagram: Dual 3-Terminal Potentiometers in 14-Pin TSSOP Configuration Detailed Description Each potentiometer consists of 255 fixed resistors in series between pins HX and LX (Figure 1). The potentiometer wiper (pin WX) can be programmed to access any one of the 256 different tap points on the resistor string. The MAX5413/MAX5414/MAX5415 require nine bits to program the wiper position. The first bit is an address code, allowing one or the other potentiometer to be selected for programming. The potentiometers are programmed independently of each other. The MAX5413/MAX5414/MAX5415 use a 3-wire serial data interface to control the wiper tap position. This write-only interface contains three inputs: Chip Select (CS), Data In (DIN), and Data Clock (SCLK). When CS is taken low, data from the DIN pin is synchronously loaded into the serial shift register on each rising edge of each SCLK pulse (Figure 2). After all the data bits _______________________________________________________________________________________ 7 MAX5413/MAX5414/MAX5415 Pin Description MAX5413/MAX5414/MAX5415 Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP POT REGISTER LOADED CS SCLK 1ST CLOCK PULSE DIN A0 D7 9TH CLOCK PULSE D6 D5 D4 D3 D2 D1 MSB D0 LSB TIME Figure 2. Potentiometer Serial Data Timing Circuit CS ••• tCSO tCSS tCL SCLK tCSW tCS1 tCH tCP tCSH ••• tDS tDH ••• DIN Figure 3. Detailed Serial Interface Timing Diagram have been shifted in, they are latched into the appropriate potentiometer control register when CS transitions from low to high. Note that if CS is not kept low during the entire data stream, the data will be corrupted and the device will need to be reloaded. The first bit A0 (address bit) is used to address one or the other of the potentiometers for programming. Potentiometer control register A is selected for writing when A0 is ‘zero,’ and potentiometer control register B is selected when A0 is ‘one.’ The MAX5413/MAX5414/MAX5415 feature POR circuitry that sets the wiper to the midscale position at powerup. Applications Information The MAX5413/MAX5414/MAX5415 are intended for a variety of circuits where accurate, fine-tuning adjustable resistance is required, such as in adjustable voltage or adjustable gain circuit configurations. It is primarily used in either a potentiometer divider or a variable-resistor configuration. 8 Adjustable Current-to-Voltage Converter Figure 5 shows the MAX5413/MAX5414/MAX5415 being used with a MAX4250 low-noise op amp to fine tune a current-to-voltage converter. Pins HX and WX of the MAX5413/MAX5414/MAX5415 are connected to the node between R3 and R2, and pin LX is connected to ground. Circuit space is minimized due to both devices’ packaging. Adjustable Gain Amplifier Figure 6 shows how to use the MAX5413/MAX5414/ MAX5415 to digitally adjust the gain of a noninverting op amp configuration. In Figure 6a, connect the MAX5413/ MAX5414/MAX5415 as a variable resistor in series with a resistor to ground to form the adjustable gain control of a noninverting amplifier. Similarly, Figure 6b shows how to use the MAX5413/ MAX5414/MAX5415 as a 3-terminal potentiometer. In this application, the MAX5413/MAX5414/MAX5415 low 5ppm/°C ratiometric tempco allows for a very stable adjustable gain configuration over temperature. _______________________________________________________________________________________ Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP B0 (A0) DATA WORD B1 (D7) B2 (D6) B3 (D5) B4 (D4) B5 (D3) B6 (D2) B7 (D1) B8 (D0) (MSB) (LSB) First Bit In Last Bit In Figure 4. Serial Data Format VCC R3 VIN HX VOUT WX +5V LX MAX5413 MAX5414 MAX5415 R2 HX V0 MAX4250 WX MAX5413 MAX5414 MAX5415 V0 / IS = R3 (1 + R2/R1) + R2 LX Figure 5. I to V Converter Adjustable Voltage Reference In Figure 7, the MAX5413/MAX5414/MAX5415 are shown with the MAX6160 to make an adjustable voltage reference. In this circuit, the H X pin of the MAX5413/MAX5414/MAX5415 is connected to the OUT pin of the MAX6160, the LX pin of the MAX5413/ MAX5414/MAX5415 is connected to GND, and the WX pin of the MAX5413/MAX5414/MAX5415 is connected to the ADJ pin of the MAX6160. The MAX5413/ MAX5414/MAX5415 allow precise setting of the voltage reference output. A low 5ppm/°C ratiometric tempco allows a very stable adjustable voltage overtemperature. Figure 6a. Adjustable Gain Circuit VCC VIN VOUT WX LX HX MAX5413 MAX5414 MAX5415 Figure 6b. Adjustable Gain Circuit Using 3-Terminal Potentiometer _______________________________________________________________________________________ 9 MAX5413/MAX5414/MAX5415 ADDRESS MAX5413/MAX5414/MAX5415 Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP Chip Information +5V VIN OUT VOREF TRANSISTOR COUNT: 8689 PROCESS: BiCMOS HX ADJ MAX5413 MAX5414 MAX5415 WX GND LX VOREF = 12.3kV ✕ Ω / (100kΩ ✕ C / 255) FOR MAX5413 VOREF = 61.5kV ✕ Ω / (50kΩ ✕ C / 255) FOR MAX5414 VOREF = 123kV ✕ Ω / (100kΩ ✕ C / 255) FOR MAX5415 WHERE C IS ANY CODE BEING WRITTEN TO A DEVICE. Figure 7. Adjustable Voltage Reference 10 ______________________________________________________________________________________ Dual, 256-Tap, Low-Drift, Digital Potentiometers in 14-Pin TSSOP TSSOP,NO PADS.EPS 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 ____________________ 11 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX5413–MAX5415 Package Information