19-5122; Rev 2; 11/10
TION KIT
EVALUA BLE
AVAILA
Dual, 256-Tap, Volatile, Low-Voltage,
Linear Taper Digital Potentiometer
Features
S
Dual, 256-Tap Linear Taper Positions
S
Single +1.7V to +5.5V Supply Operation
S
Low 12
µ
A Quiescent Supply Current
S
10kI, 50kI, 100kI End-to-End Resistance Values
S
I
2
C-Compatible Interface
S
Wiper Set to Midscale on Power-Up
S
-40NC to +125NC Operating Temperature Range
General Description
The MAX5392 dual, 256-tap, volatile, low-voltage, lin-
ear taper digital potentiometer offers three end-to-end
resistance values of 10kI, 50kI, and 100kI. Operating
from a single +1.7V to +5.5V power supply, the device
provides a low 35ppm/NC end-to-end temperature coef-
ficient. The device features an I
2
C interface.
The small package size, low supply operating voltage,
low supply current, and automotive temperature range
of the MAX5392 makes the device uniquely suited for
the portable consumer market, battery-backup industrial
applications, and the automotive market.
The MAX5392 is specified over the automotive -40NC to
+125NC temperature range and is available in a 16-pin
TSSOP package.
MAX5392
Ordering Information
PART
MAX5392LAUE+
PIN-PACKAGE
16 TSSOP
16 TSSOP
16 TSSOP
END-TO-END
RESISTANCE (kI)
10
50
100
Applications
Low-Voltage Battery Applications
Portable Electronics
Mechanical Potentiometer Replacement
Offset and Gain Control
Adjustable Voltage References/Linear Regulators
Automotive Electronics
MAX5392MAUE+
MAX5392NAUE+
Note:
All devices are specified over the -40°C to +125NC oper-
ating temperature range.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
Functional Diagram
V
DD
CHARGE
PUMP
SCL
SDA
A0
A1
A2
LATCH
I
2
C
POR
BYP
HA
WA
LA
LATCH
256 DECODER
HB
MAX5392
256 DECODER
WB
LB
GND
_______________________________________________________________
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 Potentiometer
MAX5392
ABSOLUTE MAXIMUM RATINGS
V
DD
to GND ...........................................................-0.3V to +6V
H_, W_, L_ to GND ......................................-0.3V to the lower of
(V
DD
+ 0.3V) and +6V
All Other Pins to GND .............................................-0.3V to +6V
Continuous Current in to H_, W_, and L_
MAX5392L .....................................................................
Q5mA
MAX5392M ....................................................................
Q2mA
MAX5392N.....................................................................
Q1mA
Continuous Power Dissipation (T
A
= +70NC)
16-Pin TSSOP (derate 11.1mW/NC above +70NC) ...888.9mW
Operating Temperature Range ....................... -40NC to +125NC
Junction Temperature ....................................................+150NC
Storage Temperature Range............................ -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
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
DD
= +1.7V to +5.5V, V
H_
= V
DD
, V
L_
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
DD
= +1.8V,
T
A
= +25NC.) (Note 1)
PARAMETER
Resolution
Integral Nonlinearity
Differential Nonlinearity
Dual Code Matching
Ratiometric Resistor Tempco
Full-Scale Error
SYMBOL
N
INL
DNL
(Note 2)
(Note 2)
Register A = Register B
(DV
W
/V
W
)/DT, no load
MAX5392L
Code = FFh
MAX5392M
MAX5392N
MAX5392L
Zero-Scale Error
DC PERFORMANCE (Variable Resistor Mode)
Integral Nonlinearity
Differential Nonlinearity
Wiper Resistance
Terminal Capacitance
Wiper Capacitance
End-to-End Resistor Tempco
End-to-End Resistor Tolerance
R-INL
R-DNL
R
WL
C
H
_, C
L_
C
W
_
TC
R
DR
HL
MAX5392L (Note 3)
MAX5392M (Note 3)
MAX5392N (Note 3)
(Note 3)
(Note 4)
Measured to GND
Measured to GND
No load
Wiper not connected
-25
10
50
35
+25
-1.5
-0.75
-0.5
-0.5
+1.5
+0.75
+0.5
+0.5
200
LSB
LSB
I
pF
pF
ppm/NC
%
Code = 00h
MAX5392M
MAX5392N
-3
-1
-0.5
CONDITIONS
MIN
256
-0.5
-0.5
-0.5
5
-2.2
-0.6
-0.3
2.2
0.6
0.3
3
1.0
0.5
LSB
LSB
+0.5
+0.5
+0.5
TYP
MAX
UNITS
Tap
LSB
LSB
LSB
ppm/NC
DC PERFORMANCE (Voltage Divider Mode)
DC PERFORMANCE (Resistor Characteristics)
2
______________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage,
Linear Taper Digital Potentiometer
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +1.7V to +5.5V, V
H_
= V
DD
, V
L_
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
DD
= +1.8V,
T
A
= +25NC.) (Note 1)
PARAMETER
AC PERFORMANCE
Crosstalk
-3dB Bandwidth
Total Harmonic Distortion Plus
Noise
Wiper Settling Time
Charge-Pump Feedthrough at W_
POWER SUPPLIES
Supply Voltage Range
Standby Current
DIGITAL INPUTS
Minimum Input High Voltage
Maximum Input Low Voltage
Input Leakage Current
Input Capacitance
TIMING
CHARACTERISTICS—I
2
C
(Notes 7 and 8)
f
SCL
t
SU:STA
t
HD:STA
t
HIGH
t
LOW
0.6
0.6
0.6
1.3
400
kHz
Fs
Fs
Fs
Fs
Maximum SCL Frequency
Setup Time for START Condition
Hold Time for START Condition
SCL High Time
SCL Low Time
V
IH
V
IL
V
DD
= 2.6V to 5.5V
V
DD
= 1.7V to 2.6V
V
DD
= 2.6V to 5.5V
V
DD
= 1.7V to 2.6V
-1
5
70
75
30
25
+1
% x V
DD
% x V
DD
FA
pF
V
DD
V
DD
= 5.5V
V
DD
= 1.7V
1.7
27
12
5.5
V
FA
BW
(Note 5)
Code = 80H,
10pF load,
V
DD
= 1.8V
MAX5392L
MAX5392M
MAX5392N
-90
600
100
50
0.02
400
1200
2200
600
nV
P-P
ns
%
kHz
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5392
THD+N
Measured at W, V
H_
= 1VRMS at 1kHz
MAX5392L
(Note 6)
MAX5392M
MAX5392N
t
S
V
RW
f
CLK
= 600kHz, C
BYP
= 0nF
_______________________________________________________________________________________
3
Dual, 256-Tap, Volatile, Low-Voltage,
Linear Taper Digital Potentiometer
MAX5392
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +1.7V to +5.5V, V
H_
= V
DD
, V
L_
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
DD
= +1.8V,
T
A
= +25NC.) (Note 1)
PARAMETER
Data Setup Time
Data Hold Time
SDA, SCL Rise Time
SDA, SCL Fall
Setup Time for STOP Condition
Bus Free Time Between STOP and
START Condition
Pulse Suppressed Spike Width
Capacitive Load for Each Bus
SYMBOL
t
SU:DAT
t
HD:DAT
t
R
t
F
t
SU:STO
t
BUF
t
SP
C
B
(Note 9)
Minimum power-up rate = 0.2V/Fs
0.6
1.3
50
400
CONDITIONS
MIN
100
0
0.3
0.3
TYP
MAX
UNITS
ns
Fs
Fs
Fs
Fs
Fs
ns
pF
Note 1:
All devices are 100% production tested at T
A
= +25NC. 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_ = V
DD
and L_ = GND.
The wiper terminal is unloaded and measured with a high-input-impedance 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 V
DD
= +5V, the wiper
terminal is driven with a source current of 400FA for the 10kI configuration, 80FA for the 50kI configuration, and 40FA for
the 100kI configuration. For V
DD
= +1.7V, the wiper terminal is driven with a source current of 150FA for the 10kI configu-
ration, 30FA for the 50kI configuration, and 15FA for the 100kI configuration.
Note 4:
The wiper resistance is the worst value measured by injecting the currents given in Note 3 to W_ with L_ = GND.
R
W_
= (V
W_
- V
H_
)/I
W_
.
Note 5:
Drive HA with a 1kHz GND to V
DD
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_ = V
DD
, 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.
Note 8:
The SCL clock period includes rise and fall times (t
R
= t
F
). All digital input signals are specified with t
R
= t
F
= 2ns and timed
from a voltage level of (V
IL
+ V
IH
)/2.
Note 9:
An appropriate bus pullup resistance must be selected depending on board capacitance. For I
2
C-bus specification infor-
mation from NXP Semiconductor (formerly Philips Semiconductor), refer to the UM10204: I
2
C-Bus Specification and User
Manual.
H
N.C.
W
W
L
L
Figure 1. Voltage-Divider and Variable Resistor Configurations
4
______________________________________________________________________________________
Dual, 256-Tap, Volatile, Low-Voltage,
Linear Taper Digital Potentiometer
Typical Operating Characteristics
(V
DD
= 1.8V, T
A
= +25°C, unless otherwise noted.)
MAX5392
SUPPLY CURRENT
vs. TEMPERATURE
MAX5392 toc01
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
MAX5392 toc02
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
30
MAX5392 toc03
30
25
SUPPLY CURRENT (µA)
20
15
10
V
DD
= 1.8V
5
0
V
DD
= 5V
V
DD
= 2.6V
10,000
SUPPLY CURRENT (µA)
1000
V
DD
= 5V
I
DD
(µA)
25
100
V
DD
= 2.6V
20
10
V
DD
= 1.8V
1
15
10
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
DIGITAL INPUT VOLTAGE (V)
1.7
2.2
2.7
3.2
3.7
4.2
4.7
5.2
V
DD
(V)
-40 -20 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
RESISTANCE (W_-TO-L_)
vs. TAP POSITION (10kI)
MAX5392 toc04
RESISTANCE (W_-TO-L_)
vs. TAP POSITION (50kI)
MAX5392 toc05
RESISTANCE (W_-TO-L_)
vs. TAP POSITION (100kI)
90
W_-TO-L_ RESISTANCE (kI)
80
70
60
50
40
30
20
10
0
MAX5392 toc06
10
9
W_-TO-L_ RESISTANCE (kI)
50
45
W_-TO-L_ RESISTANCE (kI)
100
8
7
6
5
4
3
2
1
0
0
51
102
153
204
40
35
30
25
20
15
10
5
0
255
0
51
102
153
204
255
0
51
102
153
204
255
TAP POSITION
TAP POSITION
TAP POSITION
WIPER RESISTANCE
vs. WIPER VOLTAGE (10kI)
MAX5392 toc07
END-TO-END RESISTANCE PERCENTAGE
CHANGE vs. TEMPERATURE
MAX5392 toc08
VARIABLE RESISTOR DNL
vs. TAP POSITION (10kI)
0.08
0.06
0.04
DNL (LSB)
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
I
WIPER
= 150µA
0
51
102
153
204
255
MAX5392 toc09
0.05
END-TO-END RESISTANCE % CHANGE
0.04
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
50kI
10kI
100kI
0.10
140
WIPER RESISTANCE (I)
120
100
V
DD
= 5V
80
V
DD
= 1.8V
V
DD
= 2.6V
60
0
0.5 1.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
WIPER VOLTAGE (V)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TAP POSITION
_______________________________________________________________________________________
5
京公网安备 11010802033920号
EEWORLD
