Rev 0; 1/06
Dual NV Audio Taper Digital Potentiometer
General Description
The DS1881 is a dual, nonvolatile (NV) digital poten-
tiometer designed to operate in audio systems that
require 5V signal levels. The potentiometer settings can
be stored in EEPROM so that they are retained when the
power is cycled. The DS1881 has separate supplies for
the potentiometers (V
CC
) and the communication circuit-
ry (V
DD
). For clickless/popless operation, a zero-crossing
detector allows the wiper position to change when there
is no voltage across the potentiometer. The device is
also designed to minimize crosstalk, and the two digital
potentiometers provide 0.5dB channel-to-channel match-
ing to prevent volume differences between channels.
Total harmonic distortion (THD) is also minimal as long
as the wiper drives a high-impedance load.
Two attenuation configuration options provide optimum
flexibility for the specific application. Configuration
Option 1 provides 63 logarithmic tapered steps (0dB to
-62dB, 1dB/step) plus a mute setting. Configuration
Option 2 has 32 logarithmic steps plus mute and pro-
vides software compatibility with the DS1808. When
Configuration Option 2 is used in combination with the
16-pin SO package, the DS1881 is both software and pin
compatible with the DS1808 in 5V applications.
♦
♦
♦
♦
♦
♦
♦
♦
♦
Features
Dual, Audio Log Taper Potentiometers
Low THD+N and Crosstalk
5V Analog Supply (Independent of Digital Supply)
3V to 5V Digital Supply Range
Potentiometer Settings Configurable as NV
or Volatile
Zero-Crossing Detector Eliminates Switching
Noise
Two User-Configurable Attenuation Options
Configuration Option 1: 63 Positions Provide 1dB
Attenuation Steps from 0dB to -62dB Plus Mute
Configuration Option 2: (Software-Compatible
with the DS1808): 33 Positions Plus Mute as
Follows
Positions 0–12: 1dB per Step for 12 Steps
Positions 13–24: 2dB per Step for 12 Steps
Positions 25–32: 3dB per Step for 8 Steps
I
2
C*-Compatible Serial Interface
Three Address Pins Allow Up to 8 Devices on
I
2
C Bus
45kΩ Potentiometer End-to-End Resistance
Industrial Temperature Range (-40°C to +85°C)
16-Pin TSSOP or SO Package
DS1881
♦
♦
♦
♦
♦
Applications
Notebook and PC Audio
Portable Audio Equipment
Car Stereo
Consumer Audio/Video
Ordering Information
PART
DS1881E-045+
Pin Configuration
TOP VIEW
GND 1
A2 2
A1 3
N.C. 4
A0 5
W0 6
L0 7
H0 8
TEMP
RANGE
-40°C to +85°C
VERSION PIN-
(kΩ)
PACKAGE
45
16 TSSOP
(173 mils)
16 TSSOP
(173 mils)
Tape-and-Reel
16 SO
(150 mils)
16 SO
(150 mils)
Tape-and-Reel
+
16 V
DD
15 V
CC
14 SCL
DS1881E-045+T&R -40°C to +85°C
45
DS1881
13 SDA
12 CE
11 W1
10 H1
9 L1
DS1881Z-045+
-40°C to +85°C
45
DS1881Z-045+T&R -40°C to +85°C
45
+Denotes
lead-free package.
TSSOP/SO
Typical Operating Circuit appears at end of data sheet.
Purchase of I
2
C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips I
2
C Patent Rights to use these components in an I
2
C system, provided that the system conforms to the I
2
C
Standard Specification as defined by Philips.
______________________________________________
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.
Dual NV Audio Taper Digital Potentiometer
DS1881
ABSOLUTE MAXIMUM RATINGS
Voltage on V
DD
, SDA, and SCL Relative to GND .....-0.5V to +6.0V
Voltage on A2, A1, A0, and
CE
Relative
to GND .................-0.5V to (V
DD
+ 0.5V), not to exceed +6.0V
Voltage on V
CC
Relative to GND ...........................-0.5V to +6.0V
Voltage on H1, H0, W1, W0, L1, and L0 Relative
to GND...............................................................-0.5V to +6.0V
Maximum Resistor Current .................................................±3mA
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 J-STD-020 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 OPERATING CONDITIONS
(T
A
= -40°C to +85°C)
PARAMETER
Digital Supply Voltage
Analog Supply Range
Potentiometer Voltages
Wiper Current
SYMBOL
V
DD
V
CC
CONDITIONS
(Notes 1, 2)
(Notes 1, 2)
MIN
2.7
4.5
0
TYP
MAX
5.5
5.5
5.5
±1
UNITS
V
V
V
mA
DC ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +5.5V, V
CC
= +4.5V to +5.5V, T
A
= -40°C to +85°C.)
PARAMETER
Digital Supply Current
Analog Supply Current
Input Logic 0
(CE, SDA, SCL, A0, A1, A2)
Input Logic 1
(CE, SDA, SCL, A0, A1, A2)
Output-Voltage Low (SDA)
Input Leakage Current
I/O Pin Input Current (SDA)
I/O Capacitance
Power-Up Time
C
I/O
t
PU
SYMBOL
I
DD
I
CC
V
IL
V
IH
V
OL
I
LI
0.4V < V
SDA
< (0.9 x V
CC
)
(Note 6)
(Note 3)
(Note 4)
(Note 5)
(Note 5)
I
OL
= 4mA
I
OL
= 6mA
-1
-10
-0.3
0.7 x
V
DD
CONDITIONS
MIN
TYP
200
0.9
MAX
250
5
0.3x
V
DD
V
DD
+
0.3
0.4
0.6
+1
+10
10
1
UNITS
µA
µA
V
V
V
µA
µA
pF
ms
2
_____________________________________________________________________
Dual NV Audio Taper Digital Potentiometer
ANALOG POTENTIOMETER CHARACTERISTICS
(V
DD
= +2.7V to +5.5V, V
CC
= +4.5V to +5.5V, T
A
= -40°C to +85°C.)
PARAMETER
End-to-End Resistance
End-to-End Resistance Tolerance
Ratiometric Temperature Coefficient
End-to-End Resistance Temperature
Coefficient
Wiper Resistance
Absolute Attenuation Tolerance
Mute Position Attenuation
Step Size Deviation from Nominal
Interchannel Matching
-3dB Cutoff Frequency
Output Noise
Crosstalk
THD+N
Zero-Crossing Detection
t
ZCD
(Note 7)
(Note 7)
10pF load
(20Hz to 20kHz, grounded input,
tap = -6dB)
(1kHz, grounded input, tap = -6dB)
1kHz, tap = -6dB, C
L
= 10pF
(Note 8)
-0.25
-0.5
5
2.2
-110
0.005
38
50
R
W
(Note 7)
-0.5
80
+0.25
+0.5
SYMBOL
R
EE
+25°C
+25°C
(Note 6)
(Note 6)
-20
30
750
160
250
+0.5
CONDITIONS
MIN
TYP
45
+20
MAX
UNITS
kΩ
%
ppm/°C
ppm/°C
Ω
dB
dB
dB
dB
MHz
µV
RMS
dB
%
ms
DS1881
I
2
C CHARACTERISTICS (See Figure 4)
(V
DD
= +2.7V to +5.5V, V
CC
= +4.5V to +5.5V, T
A
= -40°C to +85°C. Timing referenced to V
IL(MAX)
and V
IH(MIN)
.)
PARAMETER
SCL Clock Frequency
Bus Free Time Between STOP and
START Conditions
Hold Time (Repeated) START Condition
Low Period of SCL
High Period of SCL
Data Hold Time
Data Setup Time
START Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
STOP Setup Time
SDA and SCL Capacitive Loading
EEPROM Write 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
(Note 10)
(Note 11)
5
(Note 10)
(Note 10)
(Note 9)
CONDITIONS
MIN
0
1.3
0.6
1.3
0.6
0
100
0.6
20 +
0.1C
B
20 +
0.1C
B
0.6
400
10
300
300
0.9
TYP
MAX
400
UNITS
kHz
µs
µs
µs
µs
µs
ns
µs
ns
ns
µs
pF
ms
_____________________________________________________________________
3
Dual NV Audio Taper Digital Potentiometer
DS1881
NV MEMORY CHARACTERISTICS
(V
DD
= +2.7V to +5.5V, V
CC
= +4.5V to +5.5V, T
A
= 0°C to +70°C.)
PARAMETER
Writes
SYMBOL
CONDITIONS
+70°C (Note 6)
MIN
50,000
TYP
MAX
UNITS
All voltages are referenced to ground.
The value of V
DD
should never exceed V
CC
, including during power-ups. V
CC
must be applied before V
DD
.
I
DD
is specified with SDA = SCL =
CE
= V
DD
, resistor pins floating, and digital inputs connected to V
DD
or GND.
I
CC
is specified with SDA = SCL =
CE
= V
DD
, resistor pins floating, and digital inputs connected to V
DD
or GND, after zero-
crossing detection has timed out.
Note 5:
The DS1881 will not obstruct the SDA and SCL lines if V
DD
is switched off as long as the voltages applied to these inputs
do not violate their minimum and maximum input voltage levels.
Note 6:
Guaranteed by design.
Note 7:
Above Position 50, these are typical maximum. Guaranteed by characterization.
Note 8:
Load is representative of the input of a low-noise audio amp.
Note 9:
Timing shown is for fast-mode (400kHz) operation. This device is also backward-compatible with I
2
C standard-mode timing.
Note 10:
C
B
—Total capacitance of one bus line in picofarads.
Note 11:
If zero-crossing detection is enabled, the EEPROM write does not begin until the current zero-crossing detection is com-
plete. Otherwise, EEPROM write begins after a STOP condition occurs.
Note 1:
Note 2:
Note 3:
Note 4:
Typical Operating Characteristics
(V
DD
= V
CC
= +5.0V, T
A
= +25°C.)
I
DD
vs. V
DD
DS1881 toc01
I
DD
vs. TEMPERATURE
DS1881 toc02
I
DD
vs. SCL FREQUENCY
SDA = V
DD
350
ACTIVE SUPPLY CURRENT (µA)
300
250
200
150
100
50
0
DS1881 toc03
300
280
260
SUPPLY CURRENT (µA)
240
220
200
180
160
140
120
100
4.5
4.7
4.9
5.1
5.3
SDA = SCL = V
CC
400
SDA = SCL = V
DD
350
SUPPLY CURRENT (µA)
300
250
200
150
100
50
0
400
5.5
-40
-20
0
20
40
60
80
0
50
100 150 200 250 300 350 400
SCL FREQUENCY (kHz)
VOLTAGE (V)
TEMPERATURE (°C)
4
_____________________________________________________________________
Dual NV Audio Taper Digital Potentiometer
DS1881
Typical Operating Characteristics (continued)
(V
DD
= V
CC
= +5.0V, T
A
= +25°C.)
POTENTIOMETER 0 (CONFIGURATON 1)
ATTENUATION vs. SETTING
DS1881 toc04
POTENTIOMETER 0 (CONFIGURATON 2)
ATTENUATION vs. SETTING
DS1881 toc05
POTENTIOMETER 1 (CONFIGURATON 1)
ATTENUATION vs. SETTING
DS1881 toc06
0
0
0
-20.0
ATTENUATION (dB)
-20.0
ATTENUATION (dB)
-20.0
ATTENUATION (dB)
-40.0
-40.0
-40.0
-60.0
-60.0
-60.0
-80.0
-80.0
-80.0
-100.0
0
9
18
27
36
45
54
63
SETTING (DEC)
-100.0
0
3
6
9 12 15 18 21 24 27 30 33
SETTING (DEC)
-100.0
0
9
18
27
36
45
54
63
SETTING (DEC)
DS1881 toc07
RESISTANCE % CHANGE (FROM +25°C)
DS1881 toc08
0
RESISTANCE (kΩ)
-20.0
ATTENUATION (dB)
-40.0
-60.0
-80.0
-100.0
0
3
6
9 12 15 18 21 24 27 30 33
SETTING (DEC)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
-2.5
HIGH IMPEDANCE
80
60
40
MUTE WHILE
EEPROM
LOADS
PROGRAMMED
RESISTANCE (-6dB)
POTENTIOMETER 1
POTENTIOMETER 0
20
0
0
1
2
3
4
5
80
POWER-UP VOLTAGE (V)
-40
-20
0
20
40
60
TEMPERATURE (°C)
RESISTANCE
vs. POWER-DOWN VOLTAGE
DS1881 toc10
SUPPLY CURRENT
vs. ZERO-CROSSING TIMING
900
800
700
I
CC
(µA)
ZERO-CROSSING
DETECTION
ACTIVATED
ZERO-CROSSING
TIMEOUT OR ZERO-
CROSSING EVENT
DS1881 toc11
100
1000
80
RESISTANCE (kΩ)
60
600
500
400
300
200
100
40
PROGRAMMED
RESISTANCE (-6dB)
MUTE
20
TYPICAL
TIMEOUT
OF 50ms
TIME (ms)
0
0
1
2
3
4
5
POWER-UP VOLTAGE (V)
0
_____________________________________________________________________
DS1881 toc09
POTENTIOMETER 1 (CONFIGURATON 2)
ATTENUATION vs. SETTING
END-TO-END RESISTANCE PERCENT
CHANGE FROM +25°C vs. TEMPERATURE
RESISTANCE vs. POWER-UP VOLTAGE
100
5
NXP MCU
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