MAX5161LEZT ,Low-Power Digital PotentiometersMAX5160/MAX516119-1435; Rev 2a; 2/01Low-Power Digital Potentiometers
MAX5161LEZT ,Low-Power Digital Potentiometersapplications requiring digitallycontrolled resistors. Three resistance values are avail-♦ ±1LSB DNL ..
MAX5161LEZ-T ,Low-Power Digital PotentiometersApplications 6-Pin SOT23 (MAX5161)8-Pin µMAX (MAX5160)LCD Screen Adjustment♦ Glitchless Switching B ..
MAX5161LEZT+T ,Low-Power Digital PotentiometersFeaturesThe MAX5160/MAX5161 linear-taper digital potentiome-♦ 32 Tap Positionsters perform the same ..
MAX5161NEUT ,Low-Power Digital Potentiometersapplications requiring a low-temper-ature-coefficient variable resistor, such as low-tempco,' Singl ..
MAX5161NEZT ,Low-Power Digital PotentiometersFeaturesThe MAX5160/MAX5161 linear-taper digital potentiome-♦ 32 Tap Positionsters perform the same ..
MAX9686 ,Single/Dual, Very Fast TTL Latched Output ComparatorsFeatures
. 6ns Propagation Delay
. ms Latch Set-Up Tlme
. oW, -5.2V Power Supplies
. Pl ..
MAX9686BCSA ,Single/Dual, Very Fast TTL Latched Output ComparatorsFeaturesThe MAX9686 (single)/MAX9698 (dual) are very fast♦ 6ns Propagation DelayTTL comparators man ..
MAX9686CJA ,Single/Dual Very Fast TTL Output ComparatorslVI/lXI/I/l
Single/Dual Very Fast TTL Output Comparators
MAX9686CJA ,Single/Dual Very Fast TTL Output ComparatorsApplications LAAXQGQBCSE go to +70 C 16 t cad Small Outiiiie
High-Speed A/D Converters . W9698C/2, ..
MAX9686MJA ,Single/Dual Very Fast TTL Output ComparatorsELECTRICAL CHARACTERISTICS (VS = wc TA = 25 C unless otherwise noted )
( MAX9686C/9698C MAX9686M/9 ..
MAX9686MJA ,Single/Dual Very Fast TTL Output ComparatorsGeneral Description
The MAX9686 (Single) and MAX9698 (Dual) are very fast
F ea tures
. 6ns P ..
MAX5160LEUA+-MAX5160LEUA+T-MAX5160LEUA-T-MAX5160MEUA+-MAX5160MEUA+T-MAX5161LEZT-MAX5161LEZ-T-MAX5161LEZT+T-MAX5161NEZT-MAX5161NEZT+T-MAX5161NEZT-T
Low-Power Digital Potentiometers
General DescriptionThe MAX5160/MAX5161 linear-taper digital potentiome-
ters perform the same function as a mechanical poten-
tiometer or a variable resistor. They consist of a fixed
resistor and a wiper contact with 32 tap points that are
digitally controlled by three lines for the 8-pin MAX5160
or by two lines for the 6-pin MAX5161.
These parts are ideal for applications requiring digitally
controlled resistors. Three resistance values are avail-
able for each part type: 50kΩ, 100kΩ, and 200kΩ. A
nominal resistor temperature coefficient of 50ppm/°C
end-to-end and only 5ppm/°C ratiometric makes the
MAX5160 ideal for applications requiring a low-temper-
ature-coefficient variable resistor, such as low-tempco,
adjustable-gain circuit configurations.
The MAX5160 is available in an 8-pin µMAX package,
and the MAX5161 is available in a 6-pin SOT23 pack-
age. Both devices are guaranteed over the extended-
industrial temperature range (-40°C to +85°C).
ApplicationsLCD Screen Adjustment
Volume Control
Mechanical Potentiometer Replacement
Features32 Tap Positions50kΩ, 100kΩ, and 200kΩResistance Values400ΩWiper Resistance ±25% Resistance Tolerance 3-Wire Serial Data Input±1LSB DNL ±0.5LSB INL 100nA Supply Current+2.7V to +5.5V Single-Supply OperationPower-On Reset: Wiper Goes to Midscale
(position 16)±2kV ESD ProtectionSmall-Footprint Packages
6-Pin SOT23 (MAX5161)
8-Pin µMAX (MAX5160)Glitchless Switching Between the Resistor Taps
MAX5160/MAX5161
Low-Power Digital PotentiometersVDDGND
U/D
INC
MAX5160
μMAX
TOP VIEW
U/DGNDVDDINC
MAX5161
SOT23-6UP/DN
COUNTER
VDD
GNDINC
U/D
POSITION
DECODER
MAX5160
MAX5161
Functional Diagram19-1435; Rev 2a; 2/01
PART
MAX5160NEUAMAX5160MEUA
PIN-
PACKAGE8 µMAX
8 µMAX
Pin Configurations
Selector Guide
Ordering Information-40°C to +85°C
-40°C to +85°C
TEMP. RANGEMAX5160LEUA-40°C to +85°C8 µMAX
MAX5161NEZT-40°C to +85°C6 SOT23
MAX5161MEZT-40°C to +85°C6 SOT23
MAX5161LEZT-40°C to +85°C6 SOT23
(kΩ)PARTTOP
MARK
(kΩ)
MAX5160NEUA—200
MAX5160MEUA—100
MAX5160LEUA—50
MAX5161NEZTAAAC200
MAX5161MEZTAAAB100
MAX5161LEZTAAAA50
MAX5160/MAX5161
Low-Power Digital Potentiometers
Note 1:For the MAX5160, linearity is defined in terms of H to L code-dependent resistance.
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= +2.7V to +5.5V, VH= VDD, VL= 0, TA = TMINto TMAX. Typical values are at VDD= +5V, 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
CS, INC, U/Dto GND...............................................-0.3V to +6V
H, L, W to GND..........................................-0.3V to (VDD+ 0.3V)
Input and Output Latchup Immunity ..............................±200mA
Maximum Continuous Current into H, L, and W
MAX516_ _ E_ _...............................................................±1mA
Continuous Power Dissipation (TA= +70°C)
6-Pin SOT23 (derate 6.25mW/°C above +70°C)...........500mW
8-Pin µMAX (derate 4.1mW/°C above +70°C)..............330mW
Operating Temperature Range..........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s)................................+300°C
MAX516_ME_ _
MAX516_NE_ _
MAX516_LE_ _
CONDITIONS50tDIU/Dto INCSetup0tIDU/Dto INCHold25tIHINCHigh Period25tILINCLow Period0tICCSto INCHold Time25tCICSto INCSetup Time5Input Capacitance±1Input Leakage Current0.3 ✕VDDVILInput Low Voltage0.7 ✕VDDVIHInput High Voltage
37.55062.5End-to-End Resistance
LSB±1/2INLIntegral Nonlinearity (Note 1)3Resolution100125
1502002504001700RWWiper Resistance
LSB+0.1Zero-Scale Error
LSB±1DNLDifferential Nonlinearity (Note 1)
ppm/°C50TCREnd-to-End Resistor Tempco
ppm/°C5Ratiometric Resistor Tempco
LSB-0.1Full-Scale Error
UNITSMINTYPMAXSYMBOLPARAMETERMHz7fIMAXINCFrequency1tIWWiper-Settling Time= INC= U/D=
VDDor GNDnA135IDDSupply CurrentµA0.6102.75.5VDDSupply Voltage
VDD= +5V
VDD= +2.7V10CWWiper Capacitance
DIGITAL INPUTS
TIMING CHARACTERISTICS (Figure 6)
POWER SUPPLIES
DC PERFORMANCE
MAX5160/MAX5161
Low-Power Digital Potentiometers1,0002345
WIPER RESISTANCE
vs. WIPER VOLTAGEMAX5160/61 toc01
WIPER VOLTAGE (V)
WIPER RESISTANCE (
RWMAX = 574.0804
VDD = +2.7V
VDD = +5V
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
MAX5160/61 toc02
TEMPERATURE (°C)
END-TO-END RESISTANCE % CHANGE
200kΩ
200kΩ
100kΩ
50kΩ
50kΩ
100kΩ
END-TO-END RESISTANCE
vs. TAP POSITION
MAX5160/61 toc03
TAP POSITION
RESISTANCE (k
200kΩ
END-TO-END RESISTANCE
vs. TAP POSITION
MAX5160/61 toc04
TAP POSITION
RESISTANCE (k
100kΩ
Typical Operating Characteristics(VDD= +5V, TA= +25°C, unless otherwise noted.)59131721252933
END-TO-END RESISTANCE
vs. TAP POSITIONMAX5160/61 toc05
TAP POSITION
RESISTANCE (k
50kΩ
MAX5160/MAX5161
Low-Power Digital Potentiometers
PINOUTPUT
50mV/div
INC
2V/div
5μs/div
TAP-TO-TAP SWITCHING TRANSIENTMAX5160/61 toc07
ypical Operating Characteristics (continued)(VDD= +5V, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX5160/61 toc06
TEMPERATURE (°C)
SUPPLY CURRENT (
VDD = +5V
VDD = +2.7VINCWiper Increment Control Input. With CSlow, a high-to-low transition increments
(U/Dhigh) or decrements (U/Dlow) the wiper position.U/DUp/Down Control Input. With CSlow, a high-to-low INCtransition increments
(U/Dhigh) or decrements (U/Dlow) the wiper position.HHigh Terminal of ResistorGNDGroundVDDPower SupplyCSChip-Select Input. Drive low to change the wiper position throughINCand U/D.LLow Terminal of ResistorWWiper Terminal of Resistor
Pin Description
NAMEFUNCTION
MAX5160
PIN
MAX5161
MAX5160/MAX5161
Low-Power Digital Potentiometers
Detailed DescriptionThe MAX5160/MAX5161 consist of resistor arrays with
thirty-one resistive elements. Thirty-two tap points are
accessible to the wiper along the resistor string
between H and L. Logic inputs CS, U/D, and INC
determine the position of the wiper. With CSlow and
U/Dhigh, a high-to-low transition on INCincrements the
internal counter, increasing the resistance between W
and L. When both CSand U/Dare low, a high-to-low
INCtransition decrements the internal counter, decreas-
ing the resistance between W and L. At either end
(maximum or minimum positions), additional transitions in
the direction of the end points will not change the counter
value (the counter will not wrap around).
The H and L terminals of the MAX5160 are similar to the
two end terminals of a mechanical potentiometer. The
tap W is equivalent to the variable tap (wiper) of the
potentiometer.
The MAX5161 is similar to the MAX5160 except that CS
internally connects to ground and the wiper terminal (W)
is shorted to the high terminal (H). The MAX5161 acts as
a variable resistor (a potentiometer with the wiper and
one end terminal shorted together).
The MAX5160/MAX5161 feature power-on reset circuit-
ry that sets the wiper position to midscale at power-up.
Applications InformationThe MAX5160/MAX5161 are intended for circuits
requiring digitally controlled adjustable voltage or
adjustable gain, such as LCD contrast control, where
voltage biasing adjusts the display contrast.
Controlling a Switch-Mode
LCD Bias GeneratorFigure 1 shows an application where the MAX5161 is
used with a MAX1771 to make an adjustable positive
LCD-bias circuit. The output of the MAX1771 is a posi-
tive voltage that is digitally controlled through the
MAX5160/MAX5161. Similarly, Figure 2 shows the
application of the MAX5161 in a digitally controlled
negative LCD-bias circuit along with the MAX774/
MAX775/MAX776.
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)
MAX5161
Figure 1. Adjustable Positive 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
MAX5161
Figure 2. Adjustable Negative LCD Bias
MAX5160/MAX5161
Alternative Positive
LCD Bias ControlAlternatively, use an op amp to provide buffering and
gain to the output of the MAX5160/MAX5161. Connect
the MAX5160 to the positive input of a noninverting op
amp (Figure 3) to select a portion of the input signal by
digitally controlling the wiper terminal. Figure 4 shows a
similar circuit for the MAX5161.
Adjustable GainFigure 5 shows how to use the MAX5161 to digitally
adjust the gain of a noninverting op amp configuration.
Connect the MAX5161 in series with a resistor to ground
to form the adjustable gain control of a noninverting
amplifier. The MAX5160/MAX5161 have a low 5ppm/°C
ratiometric tempco that allows for a very stable adjust-
able gain configuration over temperature.
Serial InterfaceFigure 6 is the serial-interface timing diagram.
Low-Power Digital PotentiometersGAIN 6
30V
INC
GND
+5V
+5V
VOUT
VDD
U/D
MAX5160
Figure 3. MAX5160 Positive LCD Bias Control
GAIN 6
30V
GND
+5V+5V
VOUTVDD
INC
U/D
MAX5161
Figure 4. MAX5161 Positive LCD Bias Control
VCC
GND
VIN
+5V
b)VOUT
VDD
INC
U/D
VCCH
VIN
VOUT
MAX5161
MAX5160
Figure 5. Adjustable Gain Circuit: a) MAX5161; b) MAX5160
