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DS3903

Description
Triple 128-Position Nonvolatile Digital Potentiometer
File Size603KB，11 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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DS3903 Overview

Triple 128-Position Nonvolatile Digital Potentiometer

DS3903 Preview

Rev 0; 6/02
Triple 128-Position Nonvolatile
Digital Potentiometer
General Description
The DS3903 contains three nonvolatile (NV) low tem-
perature coefficient digital potentiometers, which can
be accessed through a 2-wire bus. It operates in both
3V and 5V systems, and it features a write-protect pin
that can lock the positions of the potentiometers. An
address pin allows two DS3903s to be placed on the
same 2-wire bus.
Features
♦
Three 128-Position Linear Potentiometers
(Two 10kΩ, One 90kΩ)
♦
NV Wiper Storage
♦
0 to 5.5V on Any Potentiometer Terminal
Independent of V
CC
♦
Low End-to-End Temperature Coefficient
♦
Operates on an Industry-Standard 2-Wire Bus
♦
Write-Protect Pin
♦
Supply Voltage: 3V or 5V
♦
Operating Temperature Range: -40°C to +85°C
♦
Packaging: 20-Pin TSSOP
DS3903
Applications
Power-Supply Calibration
Mobile Phones and PDAs
Fiber Optics Transceiver Modules
Portable Electronics
A Small, Low-Cost Replacement for Mechanical
Potentiometers
Ordering Information
PART
DS3903E-020
DS3903E-020/T&R
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 TSSOP
20 TSSOP
(Tape-and-Reel)
Pin Configuration
SDA 1
SCL 2
A0 3
WP 4
N.C. 5
L0 6
W1 7
L1 8
L2 9
GND 10
20 V
CC
19 N.C.
18 N.C.
17 N.C.
0.1µF
4.7kΩ
2-WIRE
MASTER
V
CC
Typical Operating Circuit
V
CC
DS3903
V
CC
4.7kΩ
SCL
SDA
POTENTIOMETER 0
10kΩ
ADDDR F9h
V
CC
POTENTIOMETER 1
90kΩ
ADDDR F8h
GND
POTENTIOMETER 2
10kΩ
ADDDR FAh
5.1kΩ
Iref
VARIABLE RESISTANCE
FOR ADJUSTABLE
CURRENT SOURCE
V
CC
DS3903
16 N.C.
15 H0
14 W0
13 H1
12 W2
11 H2
VREF1
WP
A0
HIGH-OUTPUT-IMPEDANCE
VOLTAGE REFERENCE
VREF2
TSSOP
MAX427
BUFFERED
VOLTAGE
REFERENCE
_____________________________________________
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.
Triple 128-Position Nonvolatile
Digital Potentiometer
DS3903
ABSOLUTE MAXIMUM RATINGS
Voltage on V
CC
Pin Relative to Ground.................-0.5V to +6.0V
Voltage on SDA, SCL, A0, and WP
Relative to Ground ...........................................................-0.5V to
V
CC
+ 0.5V
Voltage on L0, L1, L2, W0, W1, W2, H0, H1, and
H2 Relative to Ground ...........................................-0.5V to +6.0V
Current Through W0, W1, and W2......................................±4mA
Operating Temperature Range ...........................-40°C to +85°C
Programming Temperature Range .........................0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature ....................See IPC/JEDEC J-STD-020A
Specification
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.
RECOMMENDED DC OPERATING CONDITIONS
(T
A
= -40° to +85°C)
PARAMETER
Supply Voltage
Input Logic 1
Input Logic 0
Wiper Current
Resistor Terminals
L0, L1, L2, W0, W1, W2,
H0, H1, H2
SYMBOL
V
CC
V
IH
V
IL
I
W
V
CC
= +2.7V to +5.5V
(Note 1)
(Notes 2, 3)
(Notes 2, 3)
CONDITIONS
MIN
+2.7
0.7 x V
CC
-0.3
-3
-0.3
TYP
MAX
+5.5
V
CC
+ 0.3
0.3 x V
CC
+3
+5.5
UNITS
V
V
V
mA
V
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.7V to 5.5V, T
A
= -40°C to +85°C.)
PARAMETER
Input Leakage
Standby Supply Current
Low-Level Output Voltage (SDA)
I/O Capacitance
WP Internal Pullup Resistance
SYMBOL
IL
Istby
VOL1
VOL2
CI/O
RWP
35
65
V
CC
= 3V (Note 2)
V
CC
= 5V (Note 2)
3mA sink current
6mA sink current
0
0
CONDITIONS
MIN
-1
100
150
TYP
MAX
+1
200
250
0.4
0.6
10
110
UNITS
µA
µA
V
V
pF
kΩ
2
______________________________________________________________________
Triple 128-Position Nonvolatile
Digital Potentiometer
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.7V to 5.5V, T
A
= -40°C to +85°C.)
PARAMETER
SCL Clock Frequency
Bus Free Time Between Stop and
Start Conditions
Hold Time (Repeated) Start
Condition
Low Period of SCL Clock
High Period of SCL Clock
Data Hold Time
Data Set-Up Time
Start Set-Up Time
Rise Time of Both SDA and SCL
Signals
Fall Time of Both SDA and SCL
Signals
Set-Up Time for Stop Condition
Capacitive Load for Each Bus
EEPROM Write Time
Startup Time
SYMBOL
f
SCL
t
BUF
t
HD:STA
t
LOW
t
HIGH
t
HD:DAT
t
SU:DAT
t
SU:STA
t
R
t
F
t
SU:STO
C
B
t
W
t
ST
CONDITIONS
Fast mode (Note 4)
Standard mode (Note 4)
Fast mode (Note 4)
Standard mode (Note 4)
Fast mode (Notes 4, 5)
Standard mode (Notes 4, 5)
Fast mode (Note 4)
Standard mode (Note 4)
Fast mode (Note 4)
Standard mode (Note 4)
Fast mode (Notes 4, 6, 7)
Standard mode (Notes 4, 6, 7)
Fast mode (Note 4)
Standard mode (Note 4)
Fast mode
Standard mode
Fast mode (Note 8)
Standard mode (Note 8)
Fast mode (Note 8)
Standard mode (Note 8)
Fast mode
Standard mode
(Note 8)
(Note 9)
10
2
MIN
0
0
1.3
4.7
0.6
4.0
1.3
4.7
0.6
4.0
0
0
100
250
0.6
4.7
20 + 0.1C
B
20 + 0.1C
B
20 + 0.1C
B
20 + 0.1C
B
0.6
4.7
400
300
1000
300
300
0.9
0.9
TYP
MAX
400
100
UNITS
kHz
µs
µs
µs
µs
µs
ns
µs
ns
ns
µs
pF
ms
ms
DS3903
ANALOG RESISTOR CHARACTERISTICS
(V
CC
= 2.7V to 5.5V, T
A
= -40°C to +85°C.)
PARAMETER
End-to-End Resistance Tolerance
End-to-End Resistance
Factory-Default Wiper Setting
Wiper Resistance
Absolute Linearity
Relative Linearity
End-to-End
Temperature Coefficient
Ratiometric
Temperature Coefficient
R
W
(Note 10)
(Note 11)
-1.0
-0.25
-300
0
±30
SYMBOL
+25°C
10kΩ Pot
90kΩ Pot
Position 127 (max resistance)
250
500
+1.0
+0.25
+300
Ω
LSB
LSB
ppm/°C
ppm/°C
CONDITIONS
MIN
-20
TYP
10.5
90
MAX
+20
UNITS
%
kΩ
_____________________________________________________________________
3
Triple 128-Position Nonvolatile
Digital Potentiometer
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
All voltages are referenced to ground.
I
STBY
specified for V
CC
equal to 3.0V and 5.0V while control port logic pins are driven to the appropriate
logic levels. Appropriate logic levels specify that logic inputs are within a 0.5V of ground or V
CC
for the
corresponding inactive state. WP must be disconnected or connected high.
I/O pins of fast mode devices must not obstruct the SDA and SCL lines if V
CC
is switched off.
A fast mode device can be used in a standard mode system, but the requirement t
SU:DAT
> 250ns must
then be met. This is automatically the case if the device does not stretch the low period of the SCL signal.
If such a device does stretch the low period of the SCL signal, it must output the next data bit to the SDA
line t
RMAX
+ t
SU:DAT
= 1000ns + 250ns = 1250ns before the SCL line is released.
After this period, the first clock pulse is generated.
The maximum t
HD:DAT
has only to be met if the device does not stretch the low period (t
LOW
) of the
SCL signal.
A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the V
IN MIN
of
the SCL signal) in order to bridge the undefined region of the falling edge of SCL.
C
B
—total capacitance of one bus line in picofarads, timing referenced to 0.9 x V
CC
and 0.1 x V
CC
.
EEPROM write begins after a stop condition occurs.
Absolute linearity is used to measure expected wiper voltage as determined by wiper position in a
voltage-divider configuration.
Relative linearity is used to determine the change of wiper voltage between two adjacent wiper positions
in a voltage-divider configuration.
DS3903
Typical Operating Characteristics
(V
CC
= 5.0V, 10kΩ plots apply to both pot0 and pot2, T
A
= +25°C unless otherwise noted.)
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
DS3903 toc01
DS3903 toc02
140
SUPPLY CURRENT (µA)
120
100
10
W-L RESISTANCE (kΩ)
8
6
4
2
0
90
80
W-L RESISTANCE (kΩ)
70
60
50
40
30
20
10
0
V
CC
= 5V
V
CC
= 3V
80
60
40
20
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
0
25
50
75
100
125
0
25
50
75
100
125
WIPER SETTING
WIPER SETTING
4
______________________________________________________________________
DS3903 toc03
160
W-L RESISTANCE
vs. WIPER SETTING (10k
Ω
)
100
W-L RESISTANCE
vs. WIPER SETTING (90k
Ω
)
Triple 128-Position Nonvolatile
Digital Potentiometer
Typical Operating Characteristics (continued)
(V
CC
= 5.0V, 10kΩ plots apply to both pot0 and pot2, T
A
= +25°C unless otherwise noted.)
WIPER RESISTANCE
vs. WIPER VOLTAGE (10k
Ω
)
DS3903 toc04
DS3903
WIPER RESISTANCE
vs. WIPER VOLTAGE (90k
Ω
)
DS3903 toc05
VOLTAGE-DIVIDER PERCENT CHANGE
FROM 25°C vs. TEMPERATURE (10k
Ω
)
0.10
% CHANGE (FROM 25°C)
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
Tc = 1.5ppm/°C
WIPER = 60h
Tc = 3.7ppm/°C
WIPER = 40h
WIPER = 20h
Tc = 18.0ppm/°C
DS3903 toc06
DS3903 toc09
350
300
WIPER RESISTANCE (Ω)
250
200
150
100
50
0
0
1
2
3
4
5
WIPER VOLTAGE (V)
V
CC
= 3V
POS 7Fh
350
300
WIPER RESISTANCE (Ω)
250
200
150
100
50
0
0
1
2
3
4
5
WIPER VOLTAGE (V)
V
CC
= 3V
POS 7Fh
0.12
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
VOLTAGE-DIVIDER PERCENT CHANGE
FROM 25°C vs. TEMPERATURE (10k
Ω
)
0.03
% CHANGE (FROM 25°C)
0.02
0.01
% CHANGE
0
-0.01
-0.02
-0.03
-0.04
-0.05
-0.06
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
WIPER = 20h
WIPER = 40h
Tc = 0.7ppm/°C
Tc = 5.0ppm/°C
WIPER = 60h
Tc = 1.9ppm/°C
DS3903 toc07
END-TO-END RESISTANCE PERCENT CHANGE
FROM 25°C vs. TEMPERATURE (10k
Ω
)
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
% CHANGE
DS3903 toc08
END-TO-END RESISTANCE PERCENT CHANGE
FROM 25°C vs. TEMPERATURE (90k
Ω
)
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
0.04
1.0
VOLTAGE-DIVIDER RELATIVE LINEARITY
vs. WIPER SETTING (10k
Ω
)
DS3903 toc10
VOLTAGE-DIVIDER ABSOLUTE LINEARITY
vs. WIPER SETTING (10k
Ω
)
DS3903 toc11
0.05
0.20
0.03
ABSOLUTE LINEARTIY (LSB)
0
120
RELATIVE LINEARTIY (LSB)
0.04
0.16
0.12
0.02
0.08
0.01
0.04
0
20
40
60
80
100
WIPER SETTING
0
0
20
40
60
80
100
120
WIPER SETTING
_____________________________________________________________________
5
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