19-3929; Rev 2; 6/07
KIT
ATION
EVALU
BLE
AVAILA
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
General Description
The MAX5128 nonvolatile, single, linear-taper, digital
potentiometer performs the function of a mechanical
potentiometer, but replaces the mechanics with a sim-
ple 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) stand-
by supply current, making this device ideal for portable
applications. The MAX5128 operates from a +2.7V to
+5.25V power supply. An integrated nonvolatile memo-
ry recalls the programmed wiper position of the digital
potentiometer. A simple 2-wire up/down interface pro-
grams the wiper position. The digital potentiometer pro-
vides a low 5ppm/°C ratiometric temperature coefficient
and is specified over the extended -40°C to +85°C tem-
perature range.
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
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
PART
Ordering Information
TEMP
RANGE
PIN-
TOP
PACKAGE MARK
8 µDFN
AAF
PKG
CODE
L822-1
MAX5128ELA+ -40°C to +85°C
+Denotes
a lead-free package.
Functional Diagram
H
V
CC
GND
POR
7-BIT NV MEMORY
7
128-POSITION
DECODER
128
TAPS
W
L
UP
DN
SERIAL
INTERFACE
7
MAX5128
________________________________________________________________
Maxim Integrated Products
1
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.
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
MAX5128
ABSOLUTE MAXIMUM RATINGS
V
CC
to 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
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +5.25V, H = V
CC
, L = GND, T
A
= -40°C to +85°C. Typical values are at V
CC
= +5.0V, T
A
= +25°C, unless otherwise noted.)
(Note 1)
PARAMETER
Resolution
Integral Nonlinearity
Differential Nonlinearity
End-to-End Resistance
Temperature Coefficient
Ratiometric Resistance
Temperature Coefficient
Full-Scale Error
Zero-Scale Error
Integral Nonlinearity
Differential Nonlinearity
Wiper Resistance
Wiper Capacitance
End-to-End Resistance
DIGITAL INPUTS (UP, DN)
3.4V
≤
V
CC
≤
5.25V
Input-High Voltage (Note 5)
Input-Low Voltage
Input Leakage Current
Input Capacitance
DYNAMIC CHARACTERISTICS
Wiper -3dB Bandwidth
THD Plus Noise
f
3dB
THD+N
(Note 6)
V
H
= 0.3V
RMS
, f = 1kHz, wiper set to
midscale
400
0.02
kHz
%
V
IH
V
IL
I
IN
C
IN
5
2.7V
≤
V
CC
<
3.4V
(Note 5)
2.4
0.7 x
V
CC
0.8
SYMBOL
N
INL
DNL
TC
R
(Note 2)
(Note 2)
CONDITIONS
MIN
7
TYP
MAX
UNITS
Bits
DC PERFORMANCE (voltage-divider mode)
±1.0
±1.0
50
5
FSE
ZSE
INL
DNL
R
W
C
W
R
HL
16
(Note 3)
(Note 3)
(Note 4)
0.6
20
22
27
-3
0
0
+2
±1.75
±1
0.8
LSB
LSB
ppm/°C
ppm/°C
LSB
LSB
LSB
LSB
kΩ
pF
kΩ
DC PERFORMANCE (variable-resistor mode)
DC PERFORMANCE (resistor characteristics)
V
V
µA
pF
±1
2
_______________________________________________________________________________________
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.7V to +5.25V, H = V
CC
, L = GND, T
A
= -40°C to +85°C. Typical values are at V
CC
= +5.0V, T
A
= +25°C, unless otherwise noted.)
(Note 1)
PARAMETER
Data Retention
Endurance
POWER SUPPLY
Supply Voltage
Average Programming Current
Peak Programming Current
Standby Current
V
CC
I
PG
I
PK
I
CC
During nonvolatile write only;
digital inputs = V
CC
or GND
During nonvolatile write only;
digital inputs = V
CC
or GND
Digital inputs = V
CC
or GND, T
A
= +25°C
2.70
220
4
0.5
1.5
5.25
400
V
µA
mA
µA
SYMBOL
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
CONDITIONS
MIN
TYP
50
80,000
50,000
MAX
UNITS
Years
Stores
MAX5128
NONVOLATILE MEMORY RELIABILITY
TIMING CHARACTERISTICS
(V
CC
= +2.7V to +5.25V, H = V
CC
, L = GND, T
A
= -40°C to +85°C. Typical values are at V
CC
= +5.0V, T
A
= +25°C, unless otherwise noted.)
(See Figures 1, 2, 3, and 4).
PARAMETER
ANALOG SECTION
Wiper Settling Time
DIGITAL SECTION
UP or DN Pulse-Width High
UP or DN Pulse-Width Low
UP or DN Glitch Immunity
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
UP Fall to DN Fall Hold or DN Fall
to UP Fall Hold during NVM-
Write
t
PWH
t
PWL
t
IMMU
t
MS1
t
MS2
t
WS
80
80
20
80
80
80
ns
ns
ns
ns
ns
ns
t
S
(Note 7)
500
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
t
WH
0
ns
_______________________________________________________________________________________
3
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
MAX5128
TIMING CHARACTERISTICS (continued)
(V
CC
= +2.7V to +5.25V, H = V
CC
, L = GND, T
A
= -40°C to +85°C. Typical values are at V
CC
= +5.0V, T
A
= +25°C, unless otherwise noted.)
(See Figures 1, 2, 3, and 4).
PARAMETER
NVM-Write Mode Pulse-Width
High
Write NV Register Busy Time
Power-Up Settling Time
SYMBOL
t
WP
t
BUSY
t
ACC
(Note 8)
2
CONDITIONS
MIN
80
14
TYP
MAX
UNITS
ns
ms
µs
Note 1:
All devices are production tested at T
A
= +25°C and are guaranteed by design for T
A
= -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 ter-
minal 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.
4
_______________________________________________________________________________________
128-Tap, Nonvolatile, Linear-Taper Digital
Potentiometer in 2mm x 2mm µDFN Package
Typical Operating Characteristics
(V
CC
= +5.0V, T
A
= +25°C, unless otherwise noted.)
INTEGRAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
MAX5128 toc01
MAX5128
INTEGRAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
MAX5128 toc02
INTEGRAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
0.10
0.08
0.06
INL (LSB)
0.04
0.02
0
-0.02
-0.04
-0.06
V
CC
= 2.7V, T
A
= +85°C
MAX5128 toc03
MAX5128 toc09
MAX5128 toc06
0.12
0.10
0.08
0.06
INL (LSB)
0.04
0.02
0
-0.02
-0.04
-0.06
0
12 24 36 48 60 72 84 96 108 120
CODE
V
CC
= 2.7V, T
A
= -40°C
0.12
0.10
0.08
0.06
INL (LSB)
0.04
0.02
0
-0.02
-0.04
-0.06
0
12 24 36 48 60 72 84 96 108 120
CODE
V
CC
= 2.7V, T
A
= +25°C
0.12
0
12 24 36 48 60 72 84 96 108 120
CODE
DIFFERENTIAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
MAX5128 toc04
DIFFERENTIAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
MAX5128 toc05
DIFFERENTIAL NONLINEARITY
vs. CODE (VOLTAGE-DIVIDER)
0.010
0.008
0.006
0.004
DNL (LSB)
0.002
0
V
CC
= 2.7V, T
A
= +85°C
0.010
0.008
0.006
0.004
DNL (LSB)
V
CC
= 2.7V, T
A
= -40°C
0.010
0.008
0.006
0.004
DNL (LSB)
0.002
0
V
CC
= 2.7V, T
A
= +25°C
0.002
0
-0.002
-0.004
-0.006
-0.008
-0.010
0 12 24 36 48 60 72 84 96 108 120
CODE
-0.002
-0.004
-0.006
-0.008
-0.010
0 12 24 36 48 60 72 84 96 108 120
CODE
-0.002
-0.004
-0.006
-0.008
-0.010
0 12 24 36 48 60 72 84 96 108 120
CODE
INTEGRAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
MAX5128 toc07
INTEGRAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
MAX5128 toc08
INTEGRAL NONLINEARITY
vs. CODE (VARIABLE RESISTOR)
1.5
V
CC
= 2.7V, T
A
= +85°C
1.0
0.5
INL (LSB)
0
-0.5
-1.0
-1.5
1.5
V
CC
= 2.7V, T
A
= -40°C
1.0
0.5
INL (LSB)
1.5
V
CC
= 2.7V, T
A
= +25°C
1.0
0.5
INL (LSB)
0
-0.5
-1.0
-1.5
0
-0.5
-1.0
-1.5
0 12 24 36 48 60 72 84 96 108 120
CODE
0 12 24 36 48 60 72 84 96 108 120
CODE
0 12 24 36 48 60 72 84 96 108 120
CODE
_______________________________________________________________________________________
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