MAXIM MAX5128 Technical data
General Description
The MAX5128 nonvolatile, single, linear-taper, digital
potentiometer performs the function of a mechanical
potentiometer, but replaces the mechanics with a simple 2-wire digital interface. The MAX5128 performs the
same function as a discrete potentiometer or variable
resistor and features 128 taps and 22kΩ end-to-end
resistance. The MAX5128 also features an ultra-small,
2mm x 2mm µDFN package and low 0.5µA (typ) standby supply current, making this device ideal for portable
applications. The MAX5128 operates from a +2.7V to
+5.25V power supply. An integrated nonvolatile memory recalls the programmed wiper position of the digital
potentiometer. A simple 2-wire up/down interface programs the wiper position. The digital potentiometer provides a low 5ppm/°C ratiometric temperature coefficient
and is specified over the extended -40°C to +85°C temperature range.
Applications
V
COM
Adjustment for LCD Panels
Backlight Adjustment
LED Bias Adjustment
Power-Supply Modules
Fiber-Module Bias Setting
Bias Setting for Radios
Portable Consumer Electronics
Features
♦ Ultra-Small, 2mm x 2mm, 8-Pin µDFN Package
♦ Power-On Recall of Wiper Position from
Nonvolatile Memory
♦ 22kΩ End-to-End Resistance
♦ 128 Tap Positions
♦ 5ppm/°C Ratiometric Temperature Coefficient
♦ 1.5µA (max) Standby Supply Current
♦ +2.7V to +5.25V Single Supply Operation
♦ 80,000 Wiper Store Cycles
♦ 50-Year Wiper Data Retention
MAX5128
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
________________________________________________________________ Maxim Integrated Products 1
19-3929; Rev 2; 6/07
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
Ordering Information
Functional Diagram
+Denotes a lead-free package.
PART
M AX 5128E LA+ -40°C to +85°C 8 µDFN AAF L822-1
TEMP
RANGE
PIN PA C K A G E
TOP
MARK
PKG
CODE
H
V
CC
GND
UP
DN
SERIAL
INTERFACE
POR
7
7-BIT NV MEMORY
7
128-POSITION
DECODER
128
TAPS
MAX5128
W
L
MAX5128
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
VCCto GND...........................................................-0.3V to +6.0V
UP and DN to GND ....................................-0.3V to (V
CC
+ 0.3V)
H, L, and W to GND....................................-0.3V to (V
CC
+ 0.3V)
Maximum Continuous Current into H, L, and W ..............±0.5mA
Maximum Continuous Current into All Other Pins ............±50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µDFN (derate 4.7mW/°C above +70°C) ........376.5mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(VCC= +2.7V to +5.25V, H = VCC, L = GND, TA= -40°C to +85°C. Typical values are at VCC= +5.0V, TA= +25°C, unless otherwise noted.)
(Note 1)
DC PERFORMANCE (voltage-divider mode)
Resolution N 7 Bits
Integral Nonlinearity INL (Note 2) ±1.0 LSB
Differential Nonlinearity DNL (Note 2) ±1.0 LSB
End-to-End Resistance
Temperature Coefficient
Ratiometric Resistance
Temperature Coefficient
Full-Scale Error FSE -3 0 LSB
Zero-Scale Error ZSE 0 +2 LSB
DC PERFORMANCE (variable-resistor mode)
Integral Nonlinearity INL (Note 3) ±1.75 LSB
Differential Nonlinearity DNL (Note 3) ±1 LSB
DC PERFORMANCE (resistor characteristics)
Wiper Resistance R
Wiper Capacitance C
End-to-End Resistance R
DIGITAL INPUTS (UP, DN)
Input-High Voltage (Note 5) V
Input-Low Voltage V
Input Leakage Current I
Input Capacitance C
DYNAMIC CHARACTERISTICS
Wiper -3dB Bandwidth f
THD Plus Noise THD+N
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
TC
R
(Note 4) 0.6 0.8 kΩ
W
W
HL
3.4V ≤ VCC ≤ 5.25V 2.4
IH
2.7V ≤ VCC < 3.4V
(Note 5)
IL
IN
IN
3dB
(Note 6) 400 kHz
V
= 0.3V
H
midscale
RMS
50 ppm/°C
5 ppm/°C
20 pF
16 22 27 kΩ
0.7 x
V
CC
0.8
±1 µA
5pF
, f = 1kHz, wiper set to
0.02 %
V
V
MAX5128
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +2.7V to +5.25V, H = VCC, L = GND, TA= -40°C to +85°C. Typical values are at VCC= +5.0V, TA= +25°C, unless otherwise noted.)
(Note 1)
TIMING CHARACTERISTICS
(VCC= +2.7V to +5.25V, H = VCC, L = GND, TA= -40°C to +85°C. Typical values are at VCC= +5.0V, TA= +25°C, unless otherwise noted.)
(See Figures 1, 2, 3, and 4).
NONVOLATILE MEMORY RELIABILITY
Data Retention TA = +85°C 50 Years
Endurance
POWER SUPPLY
Supply Voltage V
Average Programming Current I
Peak Programming Current I
Standby Current I
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CC
PG
PK
CC
TA = +25°C 80,000
= +85°C 50,000
T
A
2.70 5.25 V
During nonvolatile write only;
digital inputs = V
During nonvolatile write only;
digital inputs = V
Digital inputs = VCC or GND, TA = +25°C 0.5 1.5 µA
or GND
CC
or GND
CC
220 400 µA
4mA
Stores
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ANALOG SECTION
Wiper Settling Time t
DIGITAL SECTION
UP or DN Pulse-Width High t
UP or DN Pulse-Width Low t
UP or DN Glitch Immunity t
UP Fall to DN Rise Setup or DN
Fall to UP Rise Setup
Before Entering NVM-Write
Mode, UP Fall to UP Rise
UP Rise to DN Rise Setup when
Entering NVM-Write
PWH
PWL
IMMU
t
MS1
t
MS2
t
WS
(Note 7) 500 ns
S
80 ns
80 ns
20 ns
80 ns
80 ns
80 ns
UP Fall to DN Fall Hold or DN Fall
to UP Fall Hold during NVMWrite
t
WH
0ns
MAX5128
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
4 _______________________________________________________________________________________
TIMING CHARACTERISTICS (continued)
(VCC= +2.7V to +5.25V, H = VCC, L = GND, TA= -40°C to +85°C. Typical values are at VCC= +5.0V, TA= +25°C, unless otherwise noted.)
(See Figures 1, 2, 3, and 4).
Note 1: All devices are production tested at TA= +25°C and are guaranteed by design for TA= -40°C to +85°C.
Note 2: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = V
CC
and L = GND. The
wiper terminal is unloaded and measured with a high input-impedance voltmeter.
Note 3: The DNL and INL are measured with the potentiometer configured as a variable resistor. H is unconnected and L = GND.
For the +5V condition, the wiper terminal is driven with a source current of 200µA and for the +2.7V condition, the wiper terminal is driven with a source current of 100µA.
Note 4: The wiper resistance is measured using the source currents given in Note 3.
Note 5: The device draws higher supply current when the digital inputs are driven with voltages between (V
CC
- 0.5V) and (GND +
0.5V). See Supply Current vs. Digital Input Voltage in the Typical Operating Characteristics.
Note 6: Wiper at midscale with a 10pF load, L = GND, an AC source is applied to H, and the output is measured as 3dB lower than
the DC W/H value in dB.
Note 7: Wiper-settling time is the worst-case 0 to 50% rise time measured between consecutive wiper positions. H = V
CC
, L = GND,
and the wiper terminal is unloaded and measured with a 10pF oscilloscope probe. See the Tap-to-Tap Switching Transient
in the Typical Operating Characteristics section.
Note 8: Power-up settling time is measured from the time V
CC
= 2.7V to the wiper settling to 1 LSB of the final value.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
NVM-Write Mode Pulse-Width
High
Write NV Register Busy Time t
Power-Up Settling Time t
t
WP
BUSY
ACC
80 ns
14 ms
(Note 8) 2 µs
MAX5128
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
_______________________________________________________________________________________ 5
Typical Operating Characteristics
(VCC= +5.0V, TA= +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
0.12
0.10
0.08
0.06
0.04
0.02
INL (LSB)
0
-0.02
-0.04
-0.06
0243612 48 60 72 84 96 108 120
VCC = 2.7V, TA = -40°C
CODE
MAX5128 toc01
0.12
0.10
0.08
0.06
0.04
0.02
INL (LSB)
-0.02
-0.04
-0.06
DIFFERENTIAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
MAX5128 toc04
0.010
0.008
0.006
0.004
0.002
DNL (LSB)
-0.002
-0.004
-0.006
-0.008
-0.010
0.010
0.008
0.006
0.004
0.002
0
DNL (LSB)
-0.002
-0.004
-0.006
-0.008
-0.010
0243612 48 60 72 84 96 108 120
VCC = 2.7V, TA = -40°C
CODE
INTEGRAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
VCC = 2.7V, TA = +25°C
0
0243612 48 60 72 84 96 108 120
CODE
DIFFERENTIAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
VCC = 2.7V, TA = +25°C
0
0243612 48 60 72 84 96 108 120
CODE
MAX5128 toc02
MAX5128 toc05
INTEGRAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
0.12
0.10
0.08
0.06
0.04
0.02
INL (LSB)
0
-0.02
-0.04
-0.06
0243612 48 60 72 84 96 108 120
VCC = 2.7V, TA = +85°C
CODE
DIFFERENTIAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
0.010
0.008
0.006
0.004
0.002
0
DNL (LSB)
-0.002
-0.004
-0.006
-0.008
-0.010
0243612 48 60 72 84 96 108 120
VCC = 2.7V, TA = +85°C
CODE
MAX5128 toc03
MAX5128 toc06
INTEGRAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
1.5
1.0
0.5
0
INL (LSB)
-0.5
-1.0
-1.5
0243612 48 60 72 84 96 108 120
VCC = 2.7V, TA = -40°C
CODE
MAX5128 toc07
INTEGRAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
1.5
1.0
0.5
0
INL (LSB)
-0.5
-1.0
-1.5
0243612 48 60 72 84 96 108 120
VCC = 2.7V, TA = +25°C
CODE
MAX5128 toc08
INTEGRAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
1.5
1.0
0.5
0
INL (LSB)
-0.5
-1.0
-1.5
0243612 48 60 72 84 96 108 120
VCC = 2.7V, TA = +85°C
CODE
MAX5128 toc09
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