Rev 0; 6/06
Dual Log Audio Digital Potentiometer
General Description
The DS1882 is a dual, nonvolatile (NV) digital poten-
tiometer designed to operate in audio systems that
accomodate up to ±7V signal levels. The potentiometer
settings can be stored in EEPROM so that they are
retained when the power is cycled. The DS1882 has
separate supplies for the potentiometers (V
CC
) and the
communication circuitry (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 DS1882 is also designed to mini-
mize crosstalk, and the two digital potentiometers pro-
vide 0.5dB channel-to-channel matching 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 DS1882 is both software and pin
compatible with the DS1808 in 5V applications.
Features
♦
Dual, Audio Log Taper Potentiometers
♦
Low THD+N and Crosstalk
♦
±7V Analog Supply (Independent of Digital
Supply)
♦
5V Digital Supply
♦
Potentiometer Settings Configurable as
Nonvolatile 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
DS1882
Applications
Notebook and PC Audio
Portable Audio Equipment
Car Stereo
Consumer Audio/Video
Ordering Information
PART
DS1882E-050+
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
Pin Configuration
TOP VIEW
GND 1
A2 2
A1 3
V- 4
A0 5
W0 6
L0 7
H0 8
+
16 V
DD
15 V
CC
14 SCL
13 SDA
DS1882E-050+T&R -40°C to +85°C
45
DS1882Z-050+
-40°C to +85°C
45
DS1882
12 CE
11 W1
10 H1
9 L1
DS1882Z-050+T&R -40°C to +85°C
45
+Denotes
lead-free package.
TSSOP/SO
Typical Operating Circuit appears at end of data sheet.
______________________________________________
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 Log Audio Digital Potentiometer
DS1882
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 +8.0V
Voltage on H1, H0, W1, W0, L1, and L0 Relative
to GND ............................................(V- - 0.5V) to (V
CC
+ 0.5V)
Voltage on V- Relative to GND ..............................-8.0V to +0.5V
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
Negative Supply Voltage
Potentiometer Voltages
Wiper Current
SYMBOL
V
DD
V
CC
V-
CONDITIONS
(Notes 1, 2)
(Notes 1, 2)
(Notes 1, 2)
MIN
4.5
4.5
-7.0
-V
TYP
MAX
5.5
7.0
-4.5
V
CC
±1
UNITS
V
V
V
V
mA
DC ELECTRICAL CHARACTERISTICS
(V
DD
= +4.5V to +5.5V, V
CC
= +4.5V to +7.0V, V- = -4.5V to -7.0V, 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
DD
)
(Note 6)
(Note 3)
(Note 4)
(Note 5)
(Note 5)
I
OL
= 4mA
I
OL
= 6mA
-1
-10
-0.3
0.8 x
V
DD
CONDITIONS
MIN
TYP
0.2
2.5
MAX
5
10
0.15 x
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 Log Audio Digital Potentiometer
ANALOG POTENTIOMETER CHARACTERISTICS
(V
DD
= +4.5V to +5.5V, V
CC
= +4.5V to +7.0V, V- = -4.5V to -7.0V, 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
-120
0.005
38
50
R
W
(Note 7)
-0.5
100
+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
DS1882
I
2
C CHARACTERISTICS (See Figure 4)
(V
DD
= +4.5V to +5.5V, V
CC
= +4.5V to +7.0V, V- = -4.5V to -7.0V, 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
200
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 Log Audio Digital Potentiometer
DS1882
NV MEMORY CHARACTERISTICS
(V
DD
= +4.5V to +5.5V, V
CC
= +4.5V to +7.0V, V- = -4.5V to -7.0V, 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 DS1882 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, V- = -5.0V, T
A
= +25°C.)
POTENTIOMETER 0 (CONFIGURATON 1)
ATTENUATION vs. SETTING
DS1882 toc01
POTENTIOMETER 0 (CONFIGURATON 2)
ATTENUATION vs. SETTING
DS1882 toc02
POTENTIOMETER 1 (CONFIGURATON 1)
ATTENUATION vs. SETTING
DS1882 toc03
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)
4
_____________________________________________________________________
Dual Log Audio Digital Potentiometer
DS1882
Typical Operating Characteristics (continued)
(V
DD
= V
CC
= +5.0V, V- = -5.0V, T
A
= +25°C.)
POTENTIOMETER 1 (CONFIGURATON 2)
ATTENUATION vs. SETTING
DS1882 toc04
END-TO-END RESISTANCE PERCENT
CHANGE FROM +25°C vs. TEMPERATURE
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
-3.0
-3.5
-4.0
-4.5
-5.0
DS1882 toc05
RESISTANCE vs. POWER-UP VOLTAGE
HIGH IMPEDANCE
80
RESISTANCE (kΩ)
DS1882 toc06
0
100
-20.0
ATTENUATION (dB)
RESISTANCE % CHANGE (FROM +25°C)
-40.0
60
POTENTIOMETER 1
-60.0
40
PROGRAMMED
RESISTANCE (6dBh)
MUTE
-80.0
20
POTENTIOMETER 0
0
-40
-20
0
20
40
TEMPERATURE (°C)
60
80
0
-100.0
0
3
6
9 12 15 18 21 24 27 30 33
SETTING (DEC)
1
2
3
4
5
POWER-UP VOLTAGE (V)
RESISTANCE
vs. POWER-DOWN VOLTAGE
HIGH IMPEDANCE
80
RESISTANCE (kΩ)
DS1882 toc07
I
CC
vs. ZERO-CROSSING TIMING
900
800
700
I
CC
(µA)
ZERO-CROSSING
DETECTION
ACTIVATED
ZERO-CROSSING
TIMEOUT OR ZERO-
CROSSING EVENT
DS1882 toc08
100
1000
60
600
500
400
300
200
100
0
TYPICAL
TIMEOUT
OF 50ms
40
PROGRAMMED
RESISTANCE (6dBh)
MUTE
20
0
0
1
2
3
4
5
POWER-DOWN VOLTAGE (V)
TIME (ms)
THD+N vs. FREQUENCY (0dB)
0.0016
0.0014
CROSSTALK (dB)
0.0012
THD+N (%)
0.0010
0.0008
0.0006
0.0004
0.0002
0
0.01
0.10
1.00
FREQUENCY (kHz)
10.00
100.00
DS1882 toc09
CROSSTALK vs. FREQUENCY (-6dB)
-20
-40
-60
-80
-100
-120
-140
-160
0.01
0.10
1.00
10.00
FREQUENCY (kHz)
100.00
DS1882 toc10
0.0018
0
_____________________________________________________________________
5
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