General Description
The MAX5494MAX5499 10-bit (1024-tap), dual, non-
volatile, linear-taper, programmable voltage-dividers
and variable resistors perform the function of a
mechanical potentiometer, but replace the mechanics
with a 3-wire SPITM-compatible serial interface. The
MAX5494/MAX5495 are dual, 3-terminal, programma-
ble voltage-dividers; the MAX5496/MAX5497 are dual,
2-terminal variable resistors; and the MAX5498/
MAX5499 include one 2-terminal variable resistor and
one 3-terminal programmable voltage-divider.
The MAX5494MAX5499 feature an internal, nonvolatile,
electrically erasable programmable read-only memory
(EEPROM) that stores the wiper position for initialization
during power-up. The 3-wire SPI-compatible serial inter-
face allows communication at data rates up to 7MHz.
The MAX5494MAX5499 are ideal for applications requir-
ing digitally controlled potentiometers. End-to-end resis-
tance values of 10k
and 50k are available with a
35ppm/°C end-to-end temperature coefficient. The ratio-
metric temperature coefficient is 5ppm/°C for each chan-
nel, making these devices ideal for applications requiring
low-temperature-coefficient programmable voltage-
dividers such as low-drift, programmable-gain amplifiers.
The MAX5494MAX5499 operate with either a single
power supply (+2.7V to +5.25V) or dual power supplies
(±2.5V). The devices consume 400µA (max) of supply
current when writing data to the nonvolatile memory
and 1.5µA (max) of standby supply current. The
devices are available in space-saving (5mm x 5mm x
0.8mm), 16-pin TQFN package and are specified over
the extended (-40°C to +85°C) temperature range.
Applications
Gain and Offset Adjustment
LCD Contrast Adjustment
Pressure Sensors
Low-Drift Programmable-Gain Amplifiers
Mechanical Potentiometer Replacement
Volume Control
Features
Wiper Position Stored in Nonvolatile Memory and
Recalled Upon Power-Up
16-Pin, 5mm x 5mm x 0.8mm TQFN Package
35ppm/°C End-to-End Resistance Temperature
Coefficient
5ppm/°C Ratiometric Temperature Coefficient
10k and 50k End-to-End Resistor Values
3-Wire SPI-Compatible Serial Interface
Reliability (T
A
= +85°C)
50,000 Wiper Store Cycles
50 Years Wiper Data Retention
1.5µA (max) Standby Current
Single +2.7V to +5.25V Supply Operation
Dual ±2.5V Supply Operation
MAX5494MAX5499
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
________________________________________________________________ Maxim Integrated Products
1
16
1
2
3
4
12
11
10
9
15
14
13
5
6
7
8
SCLK
N.C.
N.C.
DIN
GND
INTERF
ACE
W1
L1
H1
W2
L2
H2
V
DD
N.C.
N.C.
V
SS
TOP VIEW
MAX5494
MAX5495
CS
5mm
× 5mm × 0.8mm TQFN
16
1
2
3
4
12
11
10
9
15
14
13
5
6
7
8
SCLK
N.C.
N.C.
DIN
GND
INTERF
ACE
W1
L1
D.N.C.
W2
L2
D.N.C.
V
DD
N.C.
N.C.
V
SS
MAX5496
MAX5497
CS
5mm
× 5mm × 0.8mm TQFN
PART
TEMP RANGE
PIN-
PACKAGE
PKG CODE
MAX5494ETE
-40°C to +85°C
16 TQFN-EP*
T1655-2
MAX5495ETE
-40°C to +85°C
16 TQFN-EP*
T1655-2
Pin Configurations
Ordering Information
19-3562; Rev 1; 6/05
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.
*EP = Exposed pad.
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Pin Configurations continued at end of data sheet.
SPI is a trademark of Motorola, Inc.
MAX5494MAX5499
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +5.25V, V
SS
= GND = 0, V
H_
= V
DD
, V
L_
= 0, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
V
DD
= +5.0V, T
A
= +25°C.) (Note 1)
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.
V
DD
to GND ...........................................................-0.3V to +6.0V
V
SS
to GND............................................................-6.0V to +0.3V
V
DD
to V
SS
.............................................................-0.3V to +6.0V
H1, H2, L1, L2, W1, W2 to V
SS
.........(V
SS
- 0.3V) to (V
DD
+ 0.3V)
CS, SCLK, DIN to GND ..............................-0.3V to (V
DD
+ 0.3V)
Maximum Continuous Current into H_, L_, and W_
MAX5494/MAX5496/MAX5498 ....................................±5.0mA
MAX5495/MAX5497/MAX5499 ....................................±1.0mA
Maximum Current Into Other Pins .................................±50.0mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin TQFN (derate 20.8mW/°C above +70°C) ....1666.7mW
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
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC PERFORMANCE (MAX5494/MAX5495/MAX5498/MAX5499 Programmable Voltage-Divider)
Resolution
N
10
Bits
V
DD
= 2.7V
±2
Integral Nonlinearity (Note 2)
INL
V
DD
= 5V
±2
LSB
V
DD
= 2.7V
±1
Differential Nonlinearity (Note 2)
DNL
V
DD
= 5V
±1
LSB
End-to-End Resistance
Temperature Coefficient
TC
R
35
ppm/°C
Ratiometric Temperature
Coefficient
5
ppm/°C
MAX5494/MAX5498
-4
-2.5
0
Full-Scale Error
FSE
MAX5495/MAX5499
-4
-0.75
0
LSB
MAX5494/MAX5498
0
3.3
5
Zero-Scale Error
ZSE
MAX5495/MAX5499
0
1.45
5
LSB
Wiper Capacitance
C
W
60
pF
MAX5494/MAX5498
7.5
10
12.5
End-to-End Resistance
R
HL
MAX5495/MAX5499
37.5
50
62.5
k
MAX5494
0.05
Channel-to-Channel Division
Ratio Matching
V
DD
= 3V, midcode: 512
MAX5495
0.15
%
MAX5494/MAX5498, W_ at 15 code, H_ and
L_ shorted to V
SS
, measure resistance from
W_ to H_ (Figures 4 and 5)
6.3
Resistance from W_ to L_ and H_
MAX5495/MAX5499, W_ at 15 code, H_ and
L_ shorted to V
SS
, measure resistance from
W_ to H_ (Figures 4 and 5)
25
k
MAX5494MAX5499
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.25V, V
SS
= GND = 0, V
H_
= V
DD
, V
L_
= 0, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
V
DD
= +5.0V, T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC PERFORMANCE (MAX5496MAX5499 Variable Resistor)
Resolution
N
10
Bits
V
DD
= 2.7V
-1.6
V
DD
= 3V
-4
-1.4
+4
Integral Nonlinearity (Note 3)
INL_R
V
DD
= 5V
-4
-1.3
+4
LSB
V
DD
= 2.7V
+0.45
V
DD
= 3V
-1
+0.4
+1
Differential Nonlinearity (Note 3)
DNL_R
V
DD
= 5V
-1
+0.35
+1
LSB
Variable-Resistor Temperature
Coefficient
TC
VR
V
DD
= 3V to 5.25V; code = 128 to 1024
35
ppm/°C
Wiper Resistance
R
W
V
DD
3V (Note 4)
50
Wiper Capacitance
C
WR
60
pF
MAX5496/MAX5498
7.5
10
12.5
Full-Scale Wiper-to-End
Resistance
R
W-L
MAX5497/MAX5499
37.5
50
62.5
k
MAX5494/MAX5498
70
Zero-Scale Resistor Error
R
Z
Code = 0
MAX5495/MAX5499
110
MAX5496/MAX5498,
Code >128
0.1
Two-Channel Resistance
Matching
V
DD
= 3V to 5.25V
MAX5497/MAX5499,
Code >200
0.15
%
DIGITAL INPUTS (
CS, SCLK, DIN) (Note 5)
V
DD
= 3.6V to 5.25V
2.4
Single-supply
operation
V
DD
= 2.7V to 3.6V
0.7 x
V
DD
Input High Voltage
V
IH
Dual-supply
operation
With respect to
GND, V
DD
= 2.5V,
V
SS
= -2.5V
2.0
V
Single-supply
operation
V
DD
= 2.7V to 5.25V
0.8
Input Low Voltage
V
IL
Dual-supply
operation
With respect to
GND, V
DD
= 2.5V,
V
SS
= -2.5V
0.6
V
Input Leakage Current
I
IN
±1
µA
Input Capacitance
C
IN
5
pF
DYNAMIC CHARACTERISTICS
MAX5494/MAX5498
250
Wiper -3dB Bandwidth
BW
Wiper at code 495
(01111 01111), 10pF
load at wiper
MAX5495/MAX5499
50
kHz
MAX5494MAX5499
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +5.25V, V
SS
= GND = 0, V
H_
= V
DD
, V
L_
= 0, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
V
DD
= +5.0V, T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5494/MAX5498; V
DD
= 3V; wiper at
code 495; 10kHz, 1V
RMS
signal is applied
at H_; 10pF load at wiper
0.026
Total Harmonic Distortion
THD
MAX5495/MAX5499; V
DD
= 3V; wiper at
code 495; 10kHz, 1V
RMS
signal is applied
at H_;
10pF load at wiper
0.03
%
Analog Crosstalk
CH2 = 11111 11111, CH1 = 01111 01111,
C
W_
= 10pF, V
H1
= V
DD
= +2.5V,
V
L1
= V
SS
= -2.5V, measure V
W1
with
V
W2
= 5V
P-P
at f = 1kHz
-93
dB
NONVOLATILE MEMORY RELIABILITY
Data Retention
T
A
= +85°C
50
Years
T
A
= +25°C
200,000
Endurance
T
A
= +85°C
50,000
Stores
POWER SUPPLIES
Single-Supply Voltage
V
DD
V
SS
= GND = 0
2.70
5.25
V
V
DD
GND = 0
2.50
5.25
Dual-Supply Voltage
V
SS
(V
DD
- V
SS
)
5.25V
-2.5
-0.2
V
Average Programming Current
I
PG
During nonvolatile write only;
digital inputs = V
DD
or GND
220
400
µA
Peak Programming Current
During nonvolatile write only;
digital inputs = V
DD
or GND
4
mA
Standby Current
I
DD
Digital inputs = V
DD
or GND, T
A
= +25°C
0.6
1.5
µA
MAX5494MAX5499
10-Bit, Dual, Nonvolatile, Linear-Taper
Digital Potentiometers
_______________________________________________________________________________________
5
TIMING CHARACTERISTICS
(V
DD
= +2.7V to +5.25V, V
SS
= GND = 0, V
H_
= V
DD
, V
L_
= 0, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
V
DD
= +5.0V, T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ANALOG SECTION
MAX5494/MAX5498
5
Wiper Settling Time (Note 6)
t
S
MAX5495/MAX5499
22
µs
SPI-COMPATIBLE SERIAL INTERFACE (Figure 6)
SCLK Frequency
f
SCLK
7
MHz
SCLK Clock Period
t
CP
140
ns
SCLK Pulse-Width High
t
CH
60
ns
SCLK Pulse-Width Low
t
CL
60
ns
CS Fall to SCLK Rise Setup
t
CSS
60
ns
SCLK Rise to CS Rise Hold
t
CSH
0
ns
DIN to SCLK Setup
t
DS
40
ns
DIN Hold After SCLK
t
DH
0
ns
SCLK Rise to CS Fall Delay
t
CS0
15
ns
CS Rise to SCLK Rise Hold
t
CS1
60
ns
CS Pulse-Width High
t
CSW
150
ns
Write NV Register Busy Time
t
BUSY
12
ms
Note 1: 100% production tested at T
A
= +25°C and T
A
= +85°C. Guaranteed by design to T
A
= -40°C.
Note 2: The DNL and INL are measured for the voltage-divider with H_ = V
DD
and L_ = V
SS
. The wiper terminal (W_) is unloaded
and measured with a high-input-impedance voltmeter.
Note 3: The DNL and INL are measured with L_ = V
SS
= 0. For V
DD
= 5V, the wiper terminal is driven with a current source of I
W
=
80µA for the 50k
device and I
W
= 400µA for the 10k
device. For V
DD
= 3V, the wiper terminal is driven with a current
source of I
W
= 40µA for the 50k
device and I
W
= 200µA for the 10k
device.
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
DD
- 0.5V) and (GND +
0.5V). See the Supply Current vs. Digital Input Voltage graph in the Typical Operating Characteristics.
Note 6: Wiper settling test condition uses the voltage-divider with a 10pF load on W_. Transition code from 0 to 495 and measure
the time from CS going high to the wiper voltage settling to within 0.5% of its final value.
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