_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5386/MAX5388
General Description
The MAX5386/MAX5388 dual, 256-tap, volatile, low-voltage
linear taper digital potentiometers offer three end-to-end
resistance values of 10kI, 50kI, and 100kI. Operating
from a single +2.6V to +5.5V power supply these devices
provide a low 35ppm/NC end-to-end temperature
coefficient. The devices feature an SPIK interface.
The small package size, low supply voltage, low sup-
ply current, and automotive temperature range of the
MAX5386/MAX5388 make the devices uniquely suitable
for the portable consumer market, battery backup indus-
trial applications, and the automotive market.
The MAX5386 includes two digital potentiometers in a
voltage-divider configuration. The MAX5388 includes
one digital potentiometer in a voltage-divider configura-
tion and one digital potentiometer in a variable-resistor
configuration. The MAX5386/MAX5388 are specified
over an extended -40NC to +125NC temperature range
and are available in 16-pin, 3mm x 3mm TQFN or 10-pin,
3mm x 5mm FMAXM packages, respectively.
Applications
Low-Voltage Battery Applications
Portable Electronics
Mechanical Potentiometer Replacement
Offset and Gain Control
Adjustable Voltage References/Linear Regulators
Automotive Electronics
Features
S Dual, 256-Tap, Linear Taper Positions
S Single +2.6V to +5.5V Supply Operation
S Low (< 1µA) Quiescent Supply Current
S 10kI, 50kI, 100kI End-to-End Resistance Values
S SPI-Compatible Interface
S Power-On Sets Wiper to Midscale
S -40NC to +125NC Operating Temperature Range
19-4599; Rev 2; 1/10
Pin Configurations
Ordering Information
Note: All devices are specified over the -40°C to +125°C
operating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Functional Diagrams appear at end of data sheet.
SPI is a trademark of Motorola, Inc.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
EVALUATION KIT
AVAILABLE
PART PIN-
PACKAGE
END-TO-END
RESISTANCE (kI)
MAX5386LATE+ 16 TQFN-EP* 10
MAX5386MATE+ 16 TQFN-EP* 50
MAX5386NATE+ 16 TQFN-EP* 100
MAX5388LAUB+ 10 FMAX 10
MAX5388MAUB+ 10 FMAX 50
MAX5388NAUB+ 10 FMAX 100
15
16
14
13
5
6
7
LB
I.C.
8
HB
SCLK
DIN
VDD
1 3
HA
4
12 10 9
WA
LA
CS
N.C.
N.C.
GND
*EP
*EP = EXPOSED PAD.
MAX5386
WB N.C.
2
11
N.C.
TQFN
+
TOP VIEW
1
2
3
4
5
10
9
8
7
6
LA
WA
VDD
SCLKWB
HB
LB
GND
MAX5388
µMAX
+
TOP VIEW
DINCS
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5386/MAX5388
2 ______________________________________________________________________________________
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.
VDD to GND .............................................................-0.3V to +6V
H_, W_, L_ to GND ....-0.3V to the lower of (VDD + 0.3V) and +6V
All Other Pins to GND .............................................-0.3V to +6V
Continuous Current in to H_, W_, and L_
MAX5386L/MAX5388L ................................................... ±5mA
MAX5386M/MAX5388M ................................................. Q2mA
MAX5386N/MAX5388N ................................................. Q1mA
Continuous Power Dissipation (TA = +70NC)
16 TQFN (derate 14.7mW/NC above +70NC) .........1176.5mW
10 FMAX (derate 8.8mW/NC above +70NC) .............707.3mW
Operating Temperature Range ........................ -40NC to +125NC
Junction Temperature .....................................................+150NC
Storage Temperature Range ............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
ELECTRICAL CHARACTERISTICS
(VDD = +2.6V to +5.5V, VH_ = VDD, VL_ = GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = +5V, TA
= +25˚C. ) (Note 1)
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Resolution N 256 Tap
DC PERFORMANCE (VOLTAGE-DIVIDER MODE)
Integral Nonlinearity INL (Note 2) -0.5 +0.5 LSB
Differential Nonlinearity DNL (Note 2) -0.5 +0.5 LSB
Dual Code Matching Register A = register B -0.5 +0.5 LSB
Ratiometric Resistor Tempco (DVW/VW)/DT no load Q5 ppm/NC
Full-Scale Error Code = FFH
MAX5386L/MAX5388L -3.0 -2.5
LSB
MAX5386M/MAX5388M -1.0 -0.5
MAX5386N/MAX5388N -0.5 -0.25
Zero-Scale Error Code = 00H
MAX5386L/MAX5388L 2.5 3.0
LSBMAX5386M/MAX5388M +0.5 +1.0
MAX5386N/MAX5388N +0.25 +0.5
DC PERFORMANCE (VARIABLE-RESISTOR MODE) (Note 3)
Integral Nonlinearity R-INL
VDD > +2.6V
MAX5386L/MAX5388L Q1.0 Q2.5
LSB
MAX5386M/MAX5388M Q0.5 Q1.0
MAX5386N/MAX5388N Q0.25 Q0.8
VDD > +4.75V
MAX5386L/MAX5388L Q0.4 Q1.5
MAX5386M/MAX5388M Q0.3 Q0.75
MAX5386N/MAX5388N Q0.25 Q0.5
Differential Nonlinearity R-DNL VDD R 2.6V -0.5 +0.5 LSB
DC PERFORMANCE (RESISTOR CHARACTERISTICS)
Wiper Resistance (Note 4) RWVDD R 2.6V 250 600 I
VDD > 4.75V 150 200
Terminal Capacitance CH_, CL_ Measured to GND 10 pF
Wiper Capacitance CW_ Measured to GND 50 pF
End-to-End Resistor Tempco TCRNo load 35 ppm/NC
End-to-End Resistor Tolerance DRHL Wiper not connected -25 +25 %
AC PERFORMANCE
Crosstalk (Note 5) -90 dB
-3dB Bandwidth BW
Code = 80H,
10pF load,
VDD = +2.6V
MAX5386L/MAX5388L 600
kHzMAX5386M/MAX5388M 150
MAX5386N/MAX5388N 75
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5386/MAX5388
_______________________________________________________________________________________ 3
Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design
and characterization.
Note 2: DNL and INL are measured with the potentiometer configured as a voltage-divider (Figure 1) with H = VDD and L = GND.
The wiper terminal is unloaded and measured with an ideal voltmeter.
Note 3: R-DNL and R-INL are measured with the potentiometer configured as a variable resistor (Figure 1). DNL and INL are mea-
sured with the potentiometer configured as a variable resistor. H_ is unconnected and L_ = GND. For VDD = +5V, the wiper
terminal is driven with a source current of 400µA for the 10kI configuration, 80µA for the 50kI configuration, and 40µA for
the 100kI configuration. For VDD = +2.6V, the wiper terminal is driven with a source current of 200µA for the 10kI configu-
ration, 40µA for the 50kI configuration, and 20µA for the 100kI configuration.
Note 4: The wiper resistance is the worst value measured by injecting the currents given in Note 3 in to W with L = GND. RW = (VW
- VH)/IW.
Note 5: Drive HA with a 1kHz GND to VDD amplitude tone. LA = LB = GND. No load. WB is at midscale with a 10pF load. Measure
WB.
Note 6: The wiper-settling time is the worst case 0 to 50% rise time, measured between tap 0 and tap 127. H = VDD, L = GND, and
the wiper terminal is loaded with 10pF capacitance to ground.
Note 7: Digital timing is guaranteed by design and characterization, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.6V to +5.5V, VH_ = VDD, VL_ = GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = +5V, TA
= +25˚C. ) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Total Harmonic Distortion
Plus Noise THD+N Measured at W, VH_ = 1VRMS at 1kHz 0.015 %
Wiper Settling Time (Note 6) tS
MAX5386L/MAX5388L 300
nsMAX5386M/MAX5388M 1000
MAX5386N/MAX5388N 2000
POWER SUPPLIES
Supply Voltage Range VDD 2.6 5.5 V
Standby Current Digital inputs = VDD or GND 1 FA
DIGITAL INPUTS
Minimum Input High Voltage VIH 70 %VDD
Maximum Input Low Voltage VIL 30 %VDD
Input Leakage Current -1 +1 FA
Input Capacitance 5 pF
TIMING CHARACTERISTICS (Note 7)
Maximum SCLK Frequency fMAX 10 MHz
SCLK Clock Period tCP 100 ns
SCLK Pulse-Width High tCH 40 ns
SCLK Pulse-Width Low tCL 40 ns
CS Fall to SCLK Rise Setup Time tCSS 40 ns
SCLK Rise to CS Rise Hold Time tCSH 0 ns
DIN Setup Time tDS 40 ns
DIN Hold Time tDH 0 ns
SCLK Rise to CS Fall Delay tCS0 10 ns
SCLK Rise to SCLK Rise Hold
Time tCS1 40 ns
CS Pulse-Width High tCSW 100 ns
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5386/MAX5388
4 ______________________________________________________________________________________
Typical Operating Characteristics
(VDD = 5V, TA = +25°C, unless otherwise noted.)
RESISTANCE (W-TO-L)
vs. TAP POSITION (100kI)
MAX5386 toc06
TAP POSITION
RESISTANCE (W-TO-L) (kI)
20415310251
10k
20k
30k
40k
50k
60k
70k
80k
90k
100k
110k
0
0 255
VARIABLE-RESISTOR DNL
vs. TAP POSITION (10kI)
MAX5386 toc09
TAP POSITION
DNL (LSB)
20415310251
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.10
-0.10
0 255
IWIPER = 400µA
SUPPLY CURRENT
vs. TEMPERATURE
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
-25 -10 0 20 12535 50 65 80 95 110
0.4
0.8
0.2
0.6
1.0
0
-40
MAX5386 toc01
VDD = 2.6V
VDD = 5V
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
DIGITAL INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
0.5 3.0 5.04.54.01.5 2.52.01.0 3.5
0.01
1
0.001
0.1
10
0.0001
0
MAX5386 toc02
VDD = 2.6V
VDD = 5V
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
VDD (V)
IDD (µA)
5.53.53.0 4.0 4.5 5.0
0.25
0.75
0.50
1.00
0
2.5
MAX5386 toc03
RESISTANCE (W TO L)
vs. TAP POSITION (10kΩ)
TAP POSITION
W-TO-L RESISTANCE (kΩ)
25520415351 102
3000
9000
6000
11,000
0
4000
10,000
7000
2000
8000
5000
1000
0
MAX5386 toc04
RESISTANCE (W TO L)
vs. TAP POSITION (50kΩ)
TAP POSITION
W-TO-L RESISTANCE (k
Ω
)
25520415351 102
15,000
45,000
30,000
55,000
0
20,000
50,000
35,000
10,000
40,000
25,000
5000
0
MAX5386 toc05
WIPER RESISTANCE
vs. WIPER VOLTAGE (10kΩ)
WIPER VOLTAGE
WIPER RESISTANCE (Ω)
0.5 3.0 5.04.54.01.5 2.52.01.0 3.5
110
150
90
130
190
170
210
70
0
MAX5386 toc07
VDD = 2.6V
VDD = 5V
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
MAX5386 toc08
TEMPERATURE (NC)
END-TO-END RESISTANCE % CHANGE
1109580655035205-10-25
-0.4
-0.3
-0.2
-0.1
0
0.1
-0.5
-40 125
10kI
50kI
100kI
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5386/MAX5388
_______________________________________________________________________________________ 5
Typical Operating Characteristics (continued)
(VDD = 5V, TA = +25°C, unless otherwise noted.)
VARIABLE-RESISTOR DNL
vs. TAP POSITION (50kI)
MAX5386 toc10
TAP POSITION
DNL (LSB)
20415310251
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.10
-0.10
0 255
IWIPER = 80µA
VARIABLE-RESISTOR DNL
vs. TAP POSITION (100kI)
MAX5386 toc11
TAP POSITION
DNL (LSB)
20415310251
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.10
-0.10
0 255
IWIPER = 400µA
VARIABLE-RESISTOR INL
vs. TAP POSITION (10kI)
MAX5386 toc12
TAP POSITION
INL (LSB)
20415310251
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
-1.0
0 255
IWIPER = 400µA
VARIABLE-RESISTOR INL
vs. TAP POSITION (50kI)
MAX5386 toc13
TAP POSITION
INL (LSB)
20415310251
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-0.5
0 255
IWIPER = 80µA
VARIABLE-RESISTOR INL
vs. TAP POSITION (100kI)
MAX5386 toc14
TAP POSITION
INL (LSB)
20415310251
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-0.5
0 255
IWIPER = 400µA
VOLTAGE-DIVIDER DNL
vs. TAP POSITION (10kI)
MAX5386 toc15
TAP POSITION
DNL (LSB)
20415310251
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.10
-0.10
0 255
VOLTAGE-DIVIDER INL
vs. TAP POSITION (10kI)
MAX5386 toc18
TAP POSITION
INL (LSB)
20415310251
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-0.5
0 255
VOLTAGE-DIVIDER DNL
vs. TAP POSITION (100kI)
MAX5386 toc17
TAP POSITION
DNL (LSB)
20415310251
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.10
-0.10
0 255
VOLTAGE-DIVIDER DNL
vs. TAP POSITION (50kI)
MAX5386 toc16
TAP POSITION
DNL (LSB)
20415310251
-0.08
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
0.08
0.10
-0.10
0 255
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5386/MAX5388
6 ______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VDD = 5V, TA = +25°C, unless otherwise noted.)
VOLTAGE-DIVIDER INL
vs. TAP POSITION (50kI)
MAX5386 toc19
TAP POSITION
INL (LSB)
20415310251
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-0.5
0 255
VOLTAGE-DIVIDER INL
vs. TAP POSITION (100kI)
MAX5386 toc20
TAP POSITION
INL (LSB)
20415310251
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-0.5
0 255
TAP-TO-TAP SWITCHING TRANSIENT
(CODE 127 TO 128) (MAX5386L)
200ns/div
CS
5V/div
VW-L
20mV/div
MAX5386 toc21
TAP-TO-TAP SWITCHING TRANSIENT
(CODE 128 TO 128) (MAX5386M)
400ns/div
CS
5V/div
VW-L
20mV/div
MAX5386 toc22
MIDSCALE FREQUENCY RESPONSE
MAX5386 toc25
FREQUENCY (kHz)
GAIN (dB)
1,0001001010.1
-20
-10
0
10
-30
0.01 10,000
VIN = 1VP-P
CW = 10pF
MAX5386L
MAX5386M
MAX5386N
TAP-TO-TAP SWITCHING TRANSIENT
(CODE 127 TO 128) (MAX5386N)
1µs/div
CS
5V/div
VW-L
20mV/div
MAX5386 toc23
CROSSTALK vs. FREQUENCY
MAX5386 toc26
FREQUENCY (kHz)
CROSSTALK (dB)
1001010.1
-120
-100
-80
-60
-40
-20
0
-140
0.01 1000
MAX5386L
MAX5386M
MAX5386N
MAX5386 POWER-ON WIPER TRANSIENT
CODE 0 TO 128
2µs/div
VDD
2V/div
OUTPUT W
2V/div
MAX5386 toc24
THD+N vs. FREQUENCY
MAX5386 toc27
FREQUENCY (kHz)
THD+N (%)
1010.10
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0
0.01 100
MAX5386L
MAX5386M
MAX5386N
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5386/MAX5388
_______________________________________________________________________________________ 7
Pin Description
Figure 1. Voltage-Divider/Variable-Resistor Configurations
PIN NAME FUNCTION
MAX5386 MAX5388
1 3 HB Resistor B High Terminal. The voltage at HB can be higher or lower than the voltage
at LB. Current can flow in to or out of HB.
2 4 WB Resistor B Wiper Terminal
3 2 LB Resistor B Low Terminal. The voltage at LB can be higher or lower than the voltage
at HB. Current can flow in to or out of LB.
4 — I.C. Internally Connected. Connect to GND.
5 1 GND Ground. Both pins must be grounded.
6, 7, 11, 13 — N.C. No Connection. Not internally connected.
8 5 CS Active-Low Chip-Select Input
9 6 DIN Serial-Interface Data Input
10 7 SCLK Serial-Interface Clock Input
12 8 VDD Power-Supply Input. Bypass VDD to GND with a 0.1µF capacitor close to the device.
14 — HA Resistor A High Terminal. The voltage at HA can be higher or lower than the voltage
at LA. Current can flow in to or out of HA.
15 9 WA Resistor A Wiper Terminal
16 10 LA Resistor A Low Terminal. The voltage at LA can be higher or lower than the voltage
at HA. Current can flow in to or out of LA.
— — EP Exposed Pad (TQFN Only). Internally connected to GND. Connect to ground.
H
L
W
VOLTAGE-DIVIDER
CONFIGURATION
VARIABLE-RESISTOR
CONFIGURATION
N.C.
L
W
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5386/MAX5388
8 ______________________________________________________________________________________
Detailed Description
The MAX5386/MAX5388 dual, 256-tap, volatile low-volt-
age linear taper digital potentiometers offer three end-to-
end resistance values of 10kI, 50kI, and 100kI. Each
potentiometer consists of 255 fixed resistors in series
between terminals H and L. The potentiometer wiper, W,
is programmable to access anyone of the 256 tap points
on the resistor string.
The potentiometers in each device are programmable
independently of each other. The MAX5386/MAX5388
have an SPI interface.
SPI Digital Interface
The MAX5386/MAX5388 include an SPI interface, which
provides a 3-wire write-only serial data interface to con-
trol the wiper tap position through inputs chip select
(CS), data in (DIN), and data clock (SCLK). Drive CS
low to load data from DIN synchronously into the serial
shift register on the rising edge of each SCLK pulse.
The MAX5386/MAX5388 load the last 9 bits of clocked
data once CS transitions high. See Figures 2 and 3.
After all the data bits are shifted in, data are latched into
the appropriate potentiometer control register when CS
goes from low to high. Data written to a memory register
immediately updates the wiper position. Keep CS low
during the entire data stream to prevent the data from
being terminated.
The first bit A0 (address bit) addresses one of the two
potentiometers; writing a zero in A0 addresses control
register A and writing a one in A0 addresses control reg-
ister B. See Table 1. The power-on reset (POR) circuitry
sets the wiper to midscale (D[7:0] 1000 0000).
The 8 data bits (D7–D0) indicate the position of the
wiper. For D[7:0] = 0000 0000, the wiper moves to the
position closest to L. For D[7:0] = 1111 1111, the wiper
moves closest to H. D[7:0] is 1000 0000 following power-
on for both registers A and B.
Register A: The data byte writes to register A, and the
wiper of potentiometer A moves to the appropriate posi-
tion at the rising edge of CS. D[7:0] indicates the posi-
tion of the wiper. D[7:0] = 0000 0000 moves the wiper to
the position closest to L. D[7:0] = 1111 1111 moves the
wiper to the position closest to H. D[7:0] is 1000 0000
following power-on.
Register B: The data byte writes to register B, and the
wiper of potentiometer B moves to the appropriate posi-
tion at the rising edge of CS. D[7:0] indicates the posi-
tion of the wiper. D[7:0] = 0000 0000 moves the wiper to
the position closest to L. D[7:0] = 1111 1111 moves the
wiper to the position closest to H. D[7:0] is 1000 0000
following power-on.
Table 1. SPI Register Map
Bit Number 1 2 3 4 5 6 7 8 9
Bit Name A0 D7 D6 D5 D4 D3 D2 D1 D0
Write Wiper Register A 0 D7 D6 D5 D4 D3 D2 D1 D0
Write Wiper Register B 1 D7 D6 D5 D4 D3 D2 D1 D0
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5386/MAX5388
_______________________________________________________________________________________ 9
Figure 2. SPI Digital Interface Format
Figure 3. SPI Timing Diagram
CS
COMMAND
STARTED 9 BITS
SCLK
DIN A0 D7 D6 D5 D4 D3 D2 D0
D1
WIPER REGISTER
LOADED
SCLK
CS
DIN
tCSO tCSS tCL
tDS
tDH
tCH
tCSW
tCS1
tCSH
tCP
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5386/MAX5388
10 _____________________________________________________________________________________
Applications Information
Variable-Gain Amplifier
Figure 4 shows a potentiometer adjusting the gain of a
noninverting amplifier. Figure 5 shows a potentiometer
adjusting the gain of an inverting amplifier.
Adjustable Dual Linear Regulator
Figure 6 shows an adjustable dual linear regulator using
a dual potentiometer as two variable resistors.
Adjustable Voltage Reference
Figure 7 shows an adjustable voltage reference circuit
using a potentiometer as a voltage-divider.
Figure 4. Variable-Gain Noninverting Amplifier
Figure 5. Variable-Gain Inverting Amplifier
Figure 6. Adjustable Dual Linear Regulator
Figure 7. Adjustable Voltage Reference
VIN
VOUT
H
L
W
VIN
VOUT
HL
W
VOUT1
VOUT2
OUT1
OUT2
SET1
SET2
IN
V+
L
L
H
H
W
W
MAX8866
OUT
IN
+5V
VREF
GND L
H
W
MAX6160
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5386/MAX5388
______________________________________________________________________________________ 11
Variable Gain Current to Voltage Converter
Figure 8 shows a variable gain current-to-voltage con-
verter using a potentiometer as a variable resistor.
LCD Bias Control
Figure 9 shows a positive LCD bias control circuit using
a potentiometer as a voltage-divider.
Programmable Filter
Figure 10 shows a programmable filter using a dual
potentiometer.
Offset Voltage Adjustment Circuit
Figure 11 shows an offset voltage adjustment circuit
using a dual potentiometer.
Figure 8. Variable Gain I-to-V Converter Figure 10. Programmable Filter
Figure 9. Positive LCD Bias Control Using a Voltage-Divider
Figure 11. Offset Voltage Adjustment Circuit
L
R1 R2
R3
VOUT
IS
H
W
VOUT = IS x ((R3 x (1 + R2/R1)) + R2)
VOUT
VIN
LA
HA
WB
LB
HB
R2
R1
R3
WA
L
VOUT
H
W
+30V
+5V
VOUT
LB
HB
WB
WA
LA
HA
+5V
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5386/MAX5388
12 _____________________________________________________________________________________
Functional Diagrams
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
10 µMAX U10+2 21-0061
16 TQFN-EP T1633-5 21-0136
256
DECODER
LATCH
LATCH
POR SPI
GND
DIN
SCLK
VDD
WALA
HB
WB
LB
CS
MAX5386
HA
256
DECODER
256
DECODER
LATCH
LATCH
POR SPI
GND
DIN
SCLK
VDD
WALA
HB
WB
LB
CS
MAX5388
256
DECODER
Dual, 256-Tap, Volatile, Low-Voltage
Linear Taper Digital Potentiometers
MAX5386/MAX5388
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 13
© 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 4/09 Initial release —
1 11/09
Released MAX5386LATE+ and MAX5386NATE+ in Ordering Information;
corrected specifications for Full-Scale Error, Zero-Scale Error, and Integral
Nonlinearity in Electrical Characteristics; added I.C. row to Pin Description;
corrected Figure 1
1, 2, 7
2 1/10 Released the MAX5388LAUB+, MAX5388MAUB+, MAX5388NAUB+ + in
Ordering Information.1
