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MAX5400EKA-T
256-Tap SOT-PoT, Low-Drift Digital Potentiometers in SOT23
General DescriptionThe MAX5400/MAX5401 digital potentiometers offer
256-tap SOT-PoT™ digitally controlled variable resis-
tors in tiny 8-pin SOT23 packages. Each device func-
tions as a mechanical potentiometer, consisting of a
fixed resistor string with a digitally controlled wiper con-
tact. They operate from +2.7V to +5.5V single-supply
voltages and use an ultra-low supply current of 0.1µA.
These devices also provide glitchless switching
between resistor taps, as well as a convenient power-
on reset that sets the wiper to the midscale position at
power-up. A low 5ppm/°C ratiometric temperature coef-
ficient makes it ideal for applications requiring low drift.
The MAX5400/MAX5401 serve well in applications
requiring digitally controlled resistors, including
adjustable voltage references and programmable gain
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.
Two resistance values are available: 50kΩ(MAX5400)
and 100kΩ(MAX5401). Each device is guaranteed over
the extended industrial temperature range (-40°C to
+85°C).
________________________ApplicationsMechanical Potentiometer Replacement
Low-Drift PGAs
Adjustable Voltage References
FeaturesMiniature 8-Pin SOT23 (3mm x 3mm)256 Tap PositionsUltra-Low 0.1µA Supply CurrentSingle-Supply Operation: +2.7V to +5.5VLow Ratiometric Temperature Coefficient:
5ppm/°CPower-On Reset: Wiper Goes to Midscale
(Position 128)Glitchless Switching Between the Resistor Taps3-Wire SPI™-Interface Compatible50kΩ/100kΩResistor Values
MAX5400/MAX5401
256-Tap SOT-PoT,
Low-Drift Digital Potentiometers in SOT2319-1848; Rev 0; 10/00
Ordering InformationSOT-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
MAX5400/MAX5401
256-Tap SOT-PoT,
Low-Drift Digital Potentiometers in SOT23
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= +5V, VH= VDD, VL= 0, TA= TMINto TMAX. Typical values are at TA= +25°C, unless otherwise noted. Parameters are mea-
sured at TA= +25°C. Values over full temperature range are guaranteed by design.)
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.
VDDto 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
MAX5400/MAX5401
256-Tap SOT-PoT,
Low-Drift Digital Potentiometers in SOT23
Note 2:The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = VDDand 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 50kΩconfiguration and 40µA for the 100kΩconfiguration.
Note 4:The wiper resistance is measured assuming the source currents given in Note 2.
Note 5:Digital timing is guaranteed by design.
ELECTRICAL CHARACTERISTICS (continued)(VDD= +5V, VH= VDD, VL= 0, TA= TMINto TMAX. Typical values are at TA= +25°C, unless otherwise noted. Parameters are mea-
MAX5400/MAX5401
256-Tap SOT-PoT,
Low-Drift Digital Potentiometers in SOT23
Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
MAX5400/MAX5401
256-Tap SOT-PoT,
Low-Drift Digital Potentiometers in SOT23MAX5400 Toc10
TAP-to-TAP SWITCHING TRANSIENT
(FROM CODE 127 toc CODE 128)10mV/div
2.5V
5V/div
VW-L
ypical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
MAX5400/MAX5401
256-Tap SOT-PoT,
Low-Drift Digital Potentiometers in SOT23
Detailed DescriptionThe MAX5400/MAX5401 consists of 255 fixed resistors
in series between pins H and L. The potentiometer
wiper (pin W) can be programmed to access any one
of the 256 different tap points on the resistor string. The
MAX5400/MAX5401 uses a 3-wire serial data interface
to control the wiper tap position. This write-only inter-
face contains three inputs: Chip-Select (CS), Data In
(DIN), and Data Clock (SCLK). When CSis taken low,
data from the DIN pin is synchronously loaded into the
8-bit serial shift register on the rising edge of each
SCLK pulse. The MSB is shifted in first as shown in
Figure 4. Note that if CSis not kept low during the entire
data stream, the data will be corrupted and the device
will need to be reloaded. After all 8 data bits have been
loaded into the shift register, they are latched into the
decoder once CSis taken high. The decoder switches
the potentiometer wiper to the tap position that corre-
sponds to the 8-bit input data. Each resistor cell is
50kΩ/255 or 196.1Ωfor the MAX5400 and 100kΩ/255
or 392.2Ωfor the MAX5401.
The MAX5400/MAX5401 feature power-on reset (POR)
circuitry that sets the wiper to the midscale position at
power-up by loading a binary value of 128 into the 8-bit
latch.
The MAX5400/MAX5401 can be used as a variable
resistor by connecting pin W to either pin H or pin L.
Figure 2. Serial Interface Timing Diagram
Figure 3. Detailed Serial Interface Timing Diagram
