MAX5464EXT+T ,32-Tap FleaPoT™, 2-Wire Digital PotentiometersFeaturesThe MAX5460–MAX5468 linear-taper digital potentiome-♦ Miniature SC70 and SOT23 Packagesters ..
MAX5465EXT+T ,32-Tap FleaPoT™, 2-Wire Digital PotentiometersApplications Ordering InformationLCD Screen Adjustment PIN- TOP R PKGPARTPACKAGE MARK (kΩ) CODEVolu ..
MAX5467EUT ,32-Tap FleaPoT / 2-Wire Digital PotentiometersELECTRICAL CHARACTERISTICS(V = +2.7V to +5.5V, V = V , V = 0, T = -40°C to +85°C. Typical values ar ..
MAX5467EUT+T ,32-Tap FleaPoT™, 2-Wire Digital PotentiometersELECTRICAL CHARACTERISTICS(V = +2.7V to +5.5V, V = V , V = 0, T = -40°C to +85°C. Typical values ar ..
MAX5467EUT+T ,32-Tap FleaPoT™, 2-Wire Digital PotentiometersMAX5460–MAX546819-1956; Rev 3; 11/05™32-Tap FleaPoT , 2-Wire DigitalPotentiometers
MAX5468EUT+T ,32-Tap FleaPoT™, 2-Wire Digital PotentiometersMAX5460–MAX546819-1956; Rev 3; 11/05™32-Tap FleaPoT , 2-Wire DigitalPotentiometers
MAXQ2000-RAX ,Low-Power LCD MicrocontrollerApplications100/132 Segment LCD DriverMedical InstrumentationUp to 4 COM and 36 SegmentsStatic, 1/2 ..
MAXQ2000-RAX+ ,Low-Power LCD MicrocontrollerFeaturesMedical InstrumentationUp to 50 General-Purpose I/O PinsBattery-Powered and Portable Device ..
MAXQ2000RFX ,Low-Power LCD MicrocontrollerELECTRICAL CHARACTERISTICS(V = V to V , V = 2.7V to 3.6V, T = -40°C to +85°C.) (Note 1)DD DD(MIN) D ..
MAXQ3100-EMN+ , Mixed-Signal Microcontroller with Analog Comparators, LCD, and RTC
MAXQ3120+ ,High-Precision ADC Mixed-Signal MicrocontrollerFeaturesThe MAXQ3120 microcontroller is a high-performance, ♦ High-Performance, Low-Power, 16-Bit R ..
MAXQ3120-FFN ,High-Precision ADC Mixed-Signal MicrocontrollerFeaturesGas and ChemicalUp to 32 General-Purpose I/O PinsIndustrial ControlSensors112-Segment LCD D ..
MAX5460EXK+T-MAX5460EXK-T-MAX5464EXT+T-MAX5465EXT+T-MAX5467EUT+T-MAX5468EUT+T
32-Tap FleaPoT™, 2-Wire Digital Potentiometers
General DescriptionThe MAX5460–MAX5468 linear-taper digital potentiome-
ters perform the same function as a mechanical poten-
tiometer or a variable resistor. These devices consist of a
fixed resistor and a wiper contact with 32-tap points that
are digitally controlled through a 2-wire serial interface.
The MAX5462/MAX5465/MAX5468 are configured as
potentiometers. The rest of the devices in this family are
configured as variable resistors. See Pin Configurations
for part functionality.
Three resistance values are available: 10kΩ(MAX5466/
MAX5467/MAX5468), 50kΩ(MAX5463/MAX5464/
MAX5465), and 100kΩ(MAX5460/MAX5461/MAX5462).
The MAX5460–MAX5465 (100kΩand 50kΩ) are avail-
able in space-saving 5-pin and 6-pin SC70 packages.
The MAX5466/MAX5467/MAX5468 (10kΩ) are available
in 5-pin and 6-pin SOT23 packages.
ApplicationsLCD Screen Adjustment
Volume Control
Mechanical Potentiometer Replacement
Gain Adjustment
Line Impedance Matching
FeaturesMiniature SC70 and SOT23 Packages0.3µA Ultra-Low Supply Current+2.7V to +5.5V Single-Supply OperationGlitchless Switching Between Resistor TapsPower-On Reset to Midscale2-Wire Up/Down Serial Interface10kΩ, 50kΩ, and 100kΩResistance Values
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers TOP VIEW
GNDU/DHVDD
MAX5460
MAX5463
MAX5466
SOT23, SC70GNDU/DHVDD
MAX5461
MAX5464
MAX5467
SOT23, SC705GNDU/DHVDD
MAX5462
MAX5465
MAX5468
SOT23, SC705
Pin Configurations
Ordering Information19-1956; Rev 3; 11/05
Functional Diagram appears at end of data sheet.
PARTPIN-
PACKAGE
TOP
MARK
(kΩ)
PKG
CODE
MAX5460EXK5 SC70ACA100X5-1
MAX5461EXT6 SC70AAP100X6S-1
MAX5462EXT6 SC70AAQ100X6S-1
MAX5463EXK5 SC70ACB50X5-1
MAX5464EXT6 SC70AAR50X6S-1
MAX5465EXT6 SC70AAS50X6S-1
MAX5466EUK5 SOT23ADQQ10U5-1
MAX5467EUT6 SOT23AARH10U6-1
MAX5468EUT6 SOT23AARI10U6-1
FleaPoT is a trademark of Maxim Integrated Products Inc.
Note:All devices operate over the -40°C to +85°C temperature
range.
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= +2.7V to +5.5V, VH= VDD, VL= 0, TA= -40°C to +85°C. Typical values are at VDD= +2.7V, TA= +25°C, unless
otherwise noted.)
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
All Other Pins to GND.................................-0.3V to (VDD+ 0.3)V
Input and Output Latch-Up Immunity.............................±200mA
Maximum Continuous Current into H, L, and W
MAX5460/MAX5461/MAX5462 (100kΩ).......................±0.6mA
MAX5463/MAX5464/MAX5465 (50kΩ).........................±1.3mA
MAX5466/MAX5467/MAX5468 (10kΩ).........................±1.3mA
Continuous Power Dissipation (TA= +70°C)
5-pin SC70 (derate 3.1mW/°C above TA= +70°C)..........247mW
5-pin SOT23 (derate 7.1mW/°C above TA= +70°C)........571mW
6-pin SC70 (derate 3.1mW/°C above TA= +70°C)..........245mW
6-pin SOT23 (derate 8.7mW/°C above TA= +70°C).....695.7mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Soldering Temperature (soldering, 10s)..........................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
DC PERFORMANCEResolution32Taps
MAX5460/MAX5461/MAX546275100125
MAX5463/MAX5464/MAX546537.55062.5End-to-End Resistance
MAX5466/MAX5467/MAX54687.51012.5
End-to-End Resistance TempcoTCR35ppm/°C
Ratiometric Resistance Tempco5ppm/°C
Integral NonlinearityINL±0.5±1LSB
Differential NonlinearityDNL±1LSB
Full-Scale Error±0.1LSB
Zero-Scale Error1LSB
MAX5462/MAX54656001200Wiper ResistanceRWMAX5468160240Ω
DIGITAL INPUTSInput High VoltageVIH0.7 x VDDV
Input Low VoltageVIL0.3 x VDDV
TIMING CHARACTERISTICS (Figures 1, 2)U/D Mode to CS SetuptCU25ns
CS to U/D Step SetuptCI50ns
CS to U/D Step HoldtIC25ns
U/D Step Low PeriodtIL25ns
U/D Step High PeriodtIH25ns
Up/Down Toggle Rate (Note 1)fTOGGLE1MHz
100kΩ var i ab l e r esi stor confi g ur ati on, C L = 10p F1Output Settling Time (Note 2)tSETTLE100kΩ p otenti om eter confi g ur ati on, C L = 10p F0.25µs
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers WIPER RESISTANCE vs. WIPER VOLTAGE
(MAX5460–MAX5465)
MAX5460 toc01
WIPER VOLTAGE (V)
WIPER RESISTANCE (
VDD = +2.7V
VDD = +5V
WIPER RESISTANCE vs. WIPER VOLTAGE
(MAX5466/MAX5467/MAX5468)
MAX5460 toc02
WIPER VOLTAGE (V)
WIPER RESISTANCE (
VDD = +2.7V
VDD = +5V
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
MAX5460 toc03
TEMPERATURE (°C)
END-TO-END RESISTANCE % CHNAGE
10kΩ
50kΩ, 100kΩ
W-TO-L RESISTANCE
vs. TAP POSITION
MAX5460 toc04
RESISTANCE (k100kΩ
50kΩ
10kΩ
SUPPLY CURRENT vs. TEMPERATURE
MAX5460 toc05
CURRENT (VDD = +5V
VDD = +2.7V
U/D
2V/div
OUTPUT
100mV/div
200ns/div
TAP-TO-TAP SWITCHING TRANSIENT
(MAX5460)MAX5460 toc06
Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)
Note 1:Up/Down Toggle Rate:
Note 2:Typical settling times are dependent on end-to-end resistance.
Note 3:Supply current taken while changing wiper tap, fTOGGLE= 1MHz.
Note 4:Supply current taken while wiper position is fixed.tTOGGLESETTLE=1
ELECTRICAL CHARACTERISTICS (continued)(VDD= +2.7V to +5.5V, VH= VDD, VL= 0, TA= -40°C to +85°C. Typical values are at VDD= +2.7V, TA= +25°C, unless
otherwise noted.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
POWER SUPPLIESSupply VoltageVDD2.75.5V
Active Supply Current (Note 3)IDD25µA
Standby Supply Current (Note 4)ISDVDD = +5V0.31µA
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
Typical Operating Characteristics (continued)(TA = +25°C, unless otherwise noted.)
Pin Description
PIN
MAX5460
MAX5463
MAX5466
MAX5461
MAX5464
MAX5467
MAX5462
MAX5465
MAX5468
NAMEFUNCTION1VDDPower Supply22GNDGround3U/DUp/Down Control Input. With CS low, a low-to-high
transition increments or decrements the wiper position.4CS
Chip Select Input. A high-to-low CS transition
determines the mode: increment if U/D is high, or
decrement if U/D is low.66HHigh Terminal of Resistor5—LLow Terminal of Resistor—5WWiper Terminal of Resistor
R-INL ERROR vs. INPUT CODE (50kΩ)
MAX5460 toc10
INPUT CODE (DECIMAL)
R-INL LSB
R-DNL ERROR vs. INPUT CODE (10kΩ)MAX5460 toc11
R-DNL LSB
INPUT CODE (DECIMAL)
R-INL ERROR vs. INPUT CODE (10kΩ)
MAX5460 toc12
INPUT CODE (DECIMAL)
R-INL (LSB)
R-DNL ERROR vs. INPUT CODE (100kΩ)
MAX5460 toc07
INPUT CODE (DECIMAL)
R-DNL (LSB)
R-INL ERROR vs. INPUT CODE (100kΩ)
MAX5460 toc08
INPUT CODE (DECIMAL)
R-INL (LSB)
R-DNL ERROR vs. INPUT CODE (50kΩ)
MAX5460 toc09
INPUT CODE (DECIMAL)
R-DNL (LSB)
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
Detailed DescriptionThe MAX5460–MAX5468 consist of a fixed resistor and a
wiper contact with 32-tap points that are digitally con-
trolled through a 2-wire serial interface. Three resistance
values are available: 10kΩ(MAX5466/MAX5467/
MAX5468), 50kΩ(MAX5463/MAX5464/MAX5465), and
100kΩ(MAX5460/MAX5461/MAX5462).
The MAX5462/MAX5465/MAX5468are designed to oper-
ate as potentiometers. In this configuration, the low termi-
nal of the resistor array is connected to ground (pin 2).
The MAX5461/MAX5464/MAX5467perform as variable
resistors. In these devices, the wiper terminal and high
terminal of the resistor array are connected at pin 5.
The MAX5460/MAX5463/MAX5466 are similar variable
resistors, except the low terminal is connected to
ground (pin 2).
Digital Interface OperationThe MAX5460–MAX5468 have two modes of operation
when the serial interface is active: increment and
decrement mode. The serial interface is only active
when CSis low.
The CSand U/Dinputs control the position of the wiper
along the resistor array. When CStransitions from high to
low, the part will go into increment mode if U/Dis high,
and into decrement mode if U/Dis low. Once the mode is
set, the device will remain in that mode until CSgoes high
again. A low-to-high transition at the U/Dpin will incre-
ment or decrement the wiper position depending on the
current mode (Figures 1 and 2).
When the CSinput transitions to high (serial interface
inactive), the value of the counter is stored and the
wiper position is maintained.
Note that when the wiper reaches the maximum (or mini-
mum) tap position, the wiper will not wrap around to the
minimum (or maximum) position.
U/D
NOTE: "W" IS NOT A DIGITAL SIGNAL. IT REPRESENTS WIPER TRANSITIONS.
tCU
tIL
tIH
tSETTLE
tIC
tCI
tSETTLE
Figure 1. Serial Interface Timing Diagram, Increment Mode
U/D
tCU
tIL
tIH
tIC
tSETTLE
tCI
tSETTLE
NOTE: "W" IS NOT A DIGITAL SIGNAL. IT REPRESENTS WIPER TRANSITIONS.
MAX5460–MAX5468
32-Tap FleaPoT™, 2-Wire Digital
Potentiometers
Power-On ResetAll parts in this family feature power-on reset (POR) cir-
cuitry that sets the wiper position to midscale at power-
up. By default, the chip is in the increment mode.
Applications InformationThe MAX5460–MAX5468 are intended for circuits
requiring digitally controlled adjustable resistance,
such as LCD contrast control, where voltage biasing
adjusts the display contrast.
Controlling a Switch-Mode
LCD Bias GeneratorFigure 3 shows an application where the variable resis-
tor is used with a MAX1771 to make an adjustable posi-
tive LCD-bias circuit. The output of the MAX1771 is a
positive voltage that is digitally controlled through the
MAX5461/MAX5464/MAX5467. Similarly, Figure 4
shows the application of the variable resistor in a digi-
tally controlled negative LCD-bias circuit along with the
MAX774/MAX775/MAX776.
Alternative Positive
LCD Bias ControlAlternatively, use an op amp to provide buffering and
gain to the output of the MAX5462/MAX5465/MAX5468.
Connect the mechanical potentiometer to the positive
input of a noninverting op amp (Figure 5) to select a
portion of the input signal by digitally controlling the
wiper terminal. Figure 6 shows a similar circuit for the
MAX5461/MAX5464/MAX5467.
Adjustable GainFigure 7 shows how to use the variable resistor to digi-
tally adjust the gain of a noninverting op amp configura-
tion. Connect the MAX5461/MAX5464/MAX5467in
series with a resistor to ground to form the adjustable
gain control of a noninverting amplifier. The MAX5460–
MAX5468have a low 5ppm/°C ratiometric tempco that
allows for a very stable adjustable gain configuration
over temperature.
Figure 3. Adjustable Positive LCD BiasFigure 4. Adjustable Negative LCD Bias
MAX774
MAX775
MAX776
OUTV+
SHDNEXT
GND7
0.1µF
0.07Ω
RVAR
150µF
REF4
Si9435
1N5822/
MBR340
22µHC4*
VIN
0.1µF
VOUT
* MAX774 = 330µF, 10V
MAX775/MAX776 = 120µF, 20V
VOUT(MAX) = R2 , VOUT(MIN) = R2
VREF R1 VREF R1 + RVAR
VREF - VFB ≥ 5µA (FOR 2% GAIN-SETTING ACCURACY)R1 + RVAR
MAX5461
MAX5464
MAX5467
MAX1771
VIN = 5V
REF
SHDN
AGND
GND
MTD20N03HDL
EXT
22µHD1
1N5817-22
300µF
0.1µF
68µF
VOUT = 12V
AT 0.5A
RSENSE
40mΩ
0.1µF
VREF = 1.5V
RVAR
VOUT(MAX) = R2 + 1 VREF R1
VOUT(MIN) = ( R2 )+ 1 VREF R1 + RVAR(MAX)
MAX5461
MAX5464
MAX5467
