MAX5400/MAX5401 19-1848 Rev 0 10/00 256-Tap SOT-PoT, Low-Drift Digital Potentiometers in SOT23 General Description Features The MAX5400/MAX5401 digital potentiometers offer Miniature 8-Pin SOT23 (3mm x 3mm) 256-tap SOT-PoT digitally controlled variable resis- 256 Tap Positions tors in tiny 8-pin SOT23 packages. Each device func- tions as a mechanical potentiometer, consisting of a Ultra-Low 0.1A Supply Current fixed resistor string with a digitally controlled wiper con- Single-Supply Operation: +2.7V to +5.5V tact. They operate from +2.7V to +5.5V single-supply voltages and use an ultra-low supply current of 0.1A. Low Ratiometric Temperature Coefficient: These devices also provide glitchless switching 5ppm/C between resistor taps, as well as a convenient power- Power-On Reset: Wiper Goes to Midscale on reset that sets the wiper to the midscale position at power-up. A low 5ppm/C ratiometric temperature coef- (Position 128) ficient makes it ideal for applications requiring low drift. Glitchless Switching Between the Resistor Taps The MAX5400/MAX5401 serve well in applications 3-Wire SPI-Interface Compatible requiring digitally controlled resistors, including adjustable voltage references and programmable gain 50k /100k Resistor Values amplifiers (PGAs). A nominal end-to-end resistor tem- perature coefficient of 50ppm/C allows these parts to be used as variable resistors in applications such as low-tempco adjustable gain and other circuit configura- tions. Ordering Information Two resistance values are available: 50k (MAX5400) TEMP. PIN- PART R (k ) and 100k (MAX5401). Each device is guaranteed over RANGE PACKAGE the extended industrial temperature range (-40C to MAX5400EKA-T -40C to +85C 8-SOT23 50 +85C). MAX5401EKA-T -40C to +85C 8-SOT23 100 Applications SOT-PoT is a trademark of Maxim Integrated Products. Mechanical Potentiometer Replacement SPI is a trademark of Motorola, Inc. Low-Drift PGAs Pin Configuration appears at end of data sheet. Adjustable Voltage References Functional Diagram V DD H 8 8 8-BIT DECODER W 8-BIT LATCH SHIFT REGISTER DIN L MAX5400/MAX5401 SCLK CLOCK LOGIC POR CS GND Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.256-Tap SOT-PoT, Low-Drift Digital Potentiometers in SOT23 ABSOLUTE MAXIMUM RATINGS V to GND............................................................. -0.3V to +6V Continuous Power Dissipation (T = +70C) DD A DIN, SCLK, CS to GND ............................................-0.3V to +6V 8-Pin SOT23 (derate 8.7mW/C above +70C)...........697mW H, L, W to GND...........................................-0.3V to (V + 0.3V) Operating Temperature Range ...........................-40C to +85C DD Maximum Continuous Current into Junction Temperature ..................................................+150C Pins H, L, and W ...........................................................1mA Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C 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 = +5V, V = V , V = 0, T = T to T . Typical values are at T = +25C, unless otherwise noted. Parameters are mea- DD H DD L A MIN MAX A sured at T = +25C. Values over full temperature range are guaranteed by design.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC PERFORMANCE (Voltage Divider Mode) Resolution N 8 Bits Integral Nonlinearity INL 1/2 LSB (Notes 1, 2) Differential Nonlinearity DNL 1/2 LSB (Notes 1, 2) End-to-End Resistor Tempco TC 50 ppm/C R Ratiometric Resistor Tempco 5 ppm/C MAX5400 -0.8 Full-Scale Ratio Error LSB MAX5401 -0.4 MAX5400 +0.8 Zero-Scale Ratio Error LSB MAX5401 +0.4 POWER SUPPLIES Supply Voltage V 2.7 5.5 V DD V = 5V 0.7 5 A DD Supply Current I CS = SCLK = DIN = V DD DD V = 2.7V 0.1 A DD DC PERFORMANCE (Variable Resistor Mode) Resolution N 8 Bits V = 5V 1 CC Integral Nonlinearity INL MAX5400 1.5 LSB (Notes 1, 3) V = 3V CC MAX5401 1 V = 5V 1/2 Differential Nonlinearity CC DNL LSB (Notes 1, 3) V = 3V 1/2 CC DC PERFORMANCE (Resistor Characteristics) Wiper Resistance (Note 4) R 250 800 W Wiper Capacitance C 25 pF W MAX5401 75 100 125 End-to-End Resistance R k HL MAX5400 37.5 50 62.5 2 MAX5400/MAX5401