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Part: MAX5401EKA-T
Category:
Analog & Mixed-Signal Processing
-> Potentiometers
-> Digital Potentiometers
Description: MAX5400, MAX5401 256-Tap Sotpot, Low-drift Digital Potentiometers in SOT23
Company: Maxim Integrated Products
Datasheet: Download MAX5401EKA-T datasheet File size : 667 kB
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Datasheet text preview:
19-1848; Rev 0; 10/00
256-Tap SOT-PoT, Low-Drift Digital Potentiometers in SOT23
General Description
T h e MAX5400/MAX5401 digital potentiometers offer 256-tap SOT-PoTTM digitally controlled variable resistors in tiny 8-pin SOT23 packages. Each device functions as a mechanical potentiometer, consisting of a fixed resistor string with a digitally controlled wiper contact. They operate from +2.7V to +5.5V single-supply voltages and use an ultra-low supply current of 0.1µA. T h e s e devices also provide glitchless switching between resistor taps, as well as a convenient poweron reset that sets the wiper to the midscale position at power-up. A low 5ppm/°C ratiometric temperature coefficient makes it ideal for applications requiring low drift. T h e MAX5400/MAX5401 serve well in applications r e q u i r i n g digitally controlled resistors, including adjustable voltage references and programmable gain amplifiers (PGAs). A nominal end-to-end resistor temperature coefficient of 50ppm/°C allows these parts to be used as variable resistors in applications such as low-tempco adjustable gain and other circuit configurations. Two resistance values are available: 50k (MAX5400) and 100k (MAX5401). Each device is guaranteed over the extended industrial temperature range (-40°C to +85°C). o Miniature 8-Pin SOT23 (3mm x 3mm) o 256 Tap Positions o Ultra-Low 0.1µA Supply Current o Single-Supply Operation: +2.7V to +5.5V o Low Ratiometric Temperature Coefficient: 5ppm/°C o Power-On Reset: Wiper Goes to Midscale (Position 128) o Glitchless Switching Between the Resistor Taps o 3-Wire SPITM-Interface Compatible o 50k/100k Resistor Values
Features
MAX5400/MAX5401
Ordering Information
PART MAX5400EKA-T MAX5401EKA-T TEMP. RANGE -40°C to +85°C -40°C to +85°C PINPACKAGE 8-SOT23 8-SOT23 R (k) 50 100
________________________Applications
Mechanical Potentiometer Replacement Low-Drift PGAs Adjustable Voltage References
SOT-PoT is a trademark of Maxim Integrated Products. SPI is a trademark of Motorola, Inc. Pin Configuration appears at end of data sheet.
Functional Diagram
VDD H 8 8-BIT SHIFT REGISTER 8-BIT LATCH 8
DECODER
W
DIN
L
MAX5400/MAX5401
SCLK CS CLOCK LOGIC POR
GND
________________________________________________________________ Maxim Integrated Products
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256-Tap SOT-PoT, Low-Drift Digital Potentiometers in SOT23 MAX5400/MAX5401
ABSOLUTE MAXIMUM RATINGS
VDD to GND .... -0.3V to +6V DIN, SCLK, CS to GND ...........-0.3V to +6V H, L, W to GND..........-0.3V to (VDD + 0.3V) Maximum Continuous Current into Pins H, L, and W ..±1mA Continuous Power Dissipation (TA = +70°C) 8-Pin SOT23 (derate 8.7mW/°C above +70°C)..697mW 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, VH = VDD, VL = 0, TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise noted. Parameters are measured at TA = +25°C. Values over full temperature range are guaranteed by design.)
PARAMETER Resolution Integral Nonlinearity (Notes 1, 2) Differential Nonlinearity (Notes 1, 2) End-to-End Resistor Tempco Ratiometric Resistor Tempco Full-Scale Ratio Error Zero-Scale Ratio Error POWER SUPPLIES Supply Voltage Supply Current VDD IDD CS = SCLK = DIN = VDD VDD = 5V VDD = 2.7V 8 VCC = 5V INL VCC = 3V VCC = 5V VCC = 3V 250 25 MAX5401 MAX5400 75 37.5 100 50 125 62.5 MAX5400 MAX5401 ±1 ±1.5 ±1 ±1/2 ±1/2 800 LSB LSB 2.7 0.7 0.1 5.5 5 V µA µA Bits MAX5400 MAX5401 MAX5400 MAX5401 SYMBOL N INL DNL TCR 50 5 -0.8 -0.4 +0.8 +0.4 CONDITIONS MIN 8 ±1/2 ±1/2 TYP MAX UNITS Bits LSB LSB ppm/°C ppm/°C LSB LSB
DC PERFORMANCE (Voltage Divider Mode)
DC PERFORMANCE (Variable Resistor Mode) Resolution Integral Nonlinearity (Notes 1, 3) Differential Nonlinearity (Notes 1, 3) Wiper Resistance (Note 4) Wiper Capacitance End-to-End Resistance N
DNL
DC PERFORMANCE (Resistor Characteristics) RW CW RHL pF k
2
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256-Tap SOT-PoT, Low-Drift Digital Potentiometers in SOT23
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +5V, VH = VDD, VL = 0, TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise noted. Parameters are measured at TA = +25°C. Values over full temperature range are guaranteed by design.)
PARAMETER DIGITAL INPUTS Input High Voltage Input Low Voltage Input High Voltage Input Low Voltage Input Leakage Current Input Capacitance TIMING CHARACTERISTICS (Voltage Divider Mode) MAX5400 (to 50% of final value, from code 0 to code 128) MAX5401 (to 50% of final value, from code 0 to code 128) 100 40 40 40 0 40 0 10 40 100 300 ns 600 5.0 VIH VIL VIH VIL VCC = 5V VCC = 5V VCC = 3V VCC = 3V 0.7 VDD 0.3 VDD ±1.0 0.7 VDD 0.3 VDD V V V V µA pF SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5400/MAX5401
Wiper Settling Time
tIL
TIMING CHARACTERISTICS (Digital) (Note 5) SCLK Clock Period SCLK Pulse Width High SCLK Pulse Width Low CS Fall to SCLK Rise Setup Time SCLK Rise to CS Rise Hold Time DIN Setup Time DIN Hold Time SCLK Rise to CS Fall Delay CS Rise to SCLK Rise Hold CS Pulse Width High tCP tCH tCL tCSS tCSH tDS tDH tCS0 tCS1 tC S W ns ns ns ns ns ns ns ns ns ns
Note 1: Linearity is defined in terms of the H to L code-dependent resistance. Note 2: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = VDD and L = 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. H is unconnected and L = 0. The wiper terminal is driven with a source current of 80µA for the 50k configuration and 40µA for the 100k configuration. Note 4: The wiper resistance is measured assuming the source currents given in Note 2. Note 5: Digital timing is guaranteed by design.
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