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DS1881
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 (VCC) and the communication circuit-
ry (VDD). 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.
Applications
Notebook and PC Audio
Portable Audio Equipment
Car Stereo
Consumer Audio/Video
FeaturesDual, Audio Log Taper PotentiometersLow THD+N and Crosstalk5V Analog Supply (Independent of Digital Supply)3V to 5V Digital Supply RangePotentiometer Settings Configurable as NV
or VolatileZero-Crossing Detector Eliminates Switching
NoiseTwo User-Configurable Attenuation OptionsConfiguration Option 1: 63 Positions Provide 1dB
Attenuation Steps from 0dB to -62dB Plus MuteConfiguration 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 StepsI2C-Compatible Serial InterfaceThree Address Pins Allow Up to 8 Devices on 2C Bus45kΩPotentiometer End-to-End ResistanceIndustrial Temperature Range (-40°C to +85°C)16-Pin TSSOP or SO Package
DS1881
Dual NV Audio Taper Digital Potentiometer
VDD
VCC
SCL
SDAN.C.
GND
TOP VIEWL08L1H0
TSSOP/SO
DS1881
Pin Configuration
Rev 0; 1/06
+Denotes lead-free package.
Ordering Information
PARTTEMP
RANGE
VERSION
(kΩ)
PIN-
PACKAGE
DS1881E-050+-40°C to +85°C4516 TSSOP
(173 mils)
DS1881E-050+T&R-40°C to +85°C45
16 TS S O P 173 m i l s)
Tap e- and - Reel
DS1881Z-050+-40°C to +85°C4516 S O 150 m i l s)
DS1881Z-050+T&R-40°C to +85°C45
16 S O150 m i l s)
Tap e- and - Reel
Typical Operating Circuit appears at end of data sheet.
DS1881
Dual NV Audio Taper Digital Potentiometer
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
(TA= -40°C to +85°C)
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.
Voltage on VDD, SDA, and SCL Relative to GND.....-0.5V to +6.0V
Voltage on A2, A1, A0, and CERelative
to GND.................-0.5V to (VDD+ 0.5V), not to exceed +6.0V
Voltage on VCCRelative 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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Digital Supply VoltageVDD(Notes 1, 2)2.75.5V
Analog Supply RangeVCC(Notes 1, 2)4.55.5V
Potentiometer Voltages05.5V
Wiper Current±1mA
DC ELECTRICAL CHARACTERISTICS
(VDD= +2.7V to +5.5V, VCC= +4.5V to +5.5V, TA= -40°C to +85°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Digital Supply CurrentIDD(Note 3)200250µA
Analog Supply CurrentICC(Note 4)0.95µA
Input Logic 0
(CE, SDA, SCL, A0, A1, A2)VIL(Note 5)-0.30.3x
VDDV
Input Logic 1
(CE, SDA, SCL, A0, A1, A2)VIH(Note 5)0.7 x
VDD
VDD +
0.3V
IOL = 4mA0.4Output-Voltage Low (SDA)VOLIOL = 6mA0.6V
Input Leakage CurrentILI-1+1µA
I/O Pin Input Current (SDA)0.4V < VSDA < (0.9 x VCC)-10+10µA
I/O CapacitanceCI/O(Note 6)10pF
Power-Up TimetPU1ms
DS1881
Dual NV Audio Taper Digital Potentiometer2C CHARACTERISTICS (See Figure4)
(VDD= +2.7V to +5.5V, VCC= +4.5V to +5.5V, TA= -40°C to +85°C. Timing referenced to VIL(MAX)and VIH(MIN).)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
SCL Clock FrequencyfSCL(Note 9)0400kHz
Bus Free Time Between STOP and
START ConditionstBUF1.3µs
Hold Time (Repeated) START ConditiontHD:STA0.6µs
Low Period of SCLtLOW1.3µs
High Period of SCLtHIGH0.6µs
Data Hold TimetHD:DAT00.9µs
Data Setup TimetSU:DAT100ns
START Setup TimetSU:STA0.6µs
SDA and SCL Rise TimetR(Note 10)20 +
0.1CB300ns
SDA and SCL Fall TimetF(Note 10)20 +
0.1CB300ns
STOP Setup TimetSU:STO0.6µs
SDA and SCL Capacitive LoadingCB(Note 10)400pF
EEPROM Write TimetW(Note 11)510ms
ANALOG POTENTIOMETER CHARACTERISTICS
(VDD= +2.7V to +5.5V, VCC= +4.5V to +5.5V, TA= -40°C to +85°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
End-to-End ResistanceREE+25°C45kΩ
End-to-End Resistance Tolerance+25°C-20+20%
Ratiometric Temperature Coefficient(Note 6)30ppm/°C
End-to-End Resistance Temperature
Coefficient(Note 6)750ppm/°C
Wiper ResistanceRW160250Ω
Absolute Attenuation Tolerance(Note 7)-0.5+0.5dB
Mute Position Attenuation80dB
Step Size Deviation from Nominal(Note 7)-0.25+0.25dB
Interchannel Matching(Note 7)-0.5+0.5dB
-3dB Cutoff Frequency10pF load5MHz
Output Noise(20Hz to 20kHz, grounded input,
tap = -6dB)2.2µVRMS
Crosstalk(1kHz, grounded input, tap = -6dB)-110dB
THD+N1kHz, tap = -6dB, CL = 10pF
(Note 8)0.005%
Zero-Crossing DetectiontZCD3850ms
DS1881
Dual NV Audio Taper Digital Potentiometer
NV MEMORY CHARACTERISTICS
(VDD= +2.7V to +5.5V, VCC= +4.5V to +5.5V, TA= 0°C to +70°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Writes+70°C (Note 6)50,000
Note 1:All voltages are referenced to ground.
Note 2:The value of VDDshould never exceed VCC, including during power-ups. VCCmust be applied before VDD.
Note 3:IDDis specified with SDA = SCL = CE= VDD, resistor pins floating, and digital inputs connected to VDDor GND.
Note 4:ICCis specified with SDA = SCL = CE= VDD, resistor pins floating, and digital inputs connected to VDDor GND, after zero-
crossing detection has timed out.
Note 5:The DS1881 will not obstruct the SDA and SCL lines if VDDis 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 I2C standard-mode timing.
Note 10:CB—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.
IDD vs. VDD
DS1881 toc01
VOLTAGE (V)
SUPPLY CURRENT (
SDA = SCL = VCC
IDD vs. TEMPERATURE
DS1881 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (60-2002040
SDA = SCL = VDD
IDD vs. SCL FREQUENCY
DS1881 toc03
SCL FREQUENCY (kHz)
ACTIVE SUPPLY CURRENT (
SDA = VDD
Typical Operating Characteristics
(VDD= VCC= +5.0V, TA= +25°C.)
DS1881
Dual NV Audio Taper Digital Potentiometer
POTENTIOMETER 0 (CONFIGURATON 1)
ATTENUATION vs. SETTING
DS1881 toc04
SETTING (DEC)
ATTENUATION (dB)453627189
POTENTIOMETER 0 (CONFIGURATON 2)
ATTENUATION vs. SETTING
DS1881 toc05
SETTING (DEC)
ATTENUATION (dB)2418126
POTENTIOMETER 1 (CONFIGURATON 1)
ATTENUATION vs. SETTING
DS1881 toc06
SETTING (DEC)
ATTENUATION (dB)3618
POTENTIOMETER 1 (CONFIGURATON 2)
ATTENUATION vs. SETTING
DS1881 toc07
SETTING (DEC)
ATTENUATION (dB)2418126
END-TO-END RESISTANCE PERCENT
CHANGE FROM +25°C vs. TEMPERATURE
DS1881 toc08
TEMPERATURE (°C)
RESISTANCE % CHANGE (FROM +25200-20
POTENTIOMETER 1
POTENTIOMETER 0
RESISTANCE
vs. POWER-DOWN VOLTAGE
DS1881 toc10
POWER-UP VOLTAGE (V)
RESISTANCE (k4321
PROGRAMMED
RESISTANCE (-6dB)
MUTE
SUPPLY CURRENT
vs. ZERO-CROSSING TIMING
DS1881 toc11
TIME (ms)
ICC
ZERO-CROSSING
TIMEOUT OR ZERO-
CROSSING EVENT
ZERO-CROSSING
DETECTION
ACTIVATED
TYPICAL
TIMEOUT
OF 50msypical Operating Characteristics (continued)
(VDD= VCC= +5.0V, TA= +25°C.)
RESISTANCE vs. POWER-UP VOLTAGE
DS1881 toc09
POWER-UP VOLTAGE (V)
RESISTANCE (k4321
HIGH IMPEDANCE
PROGRAMMED
RESISTANCE (-6dB)
MUTE WHILE
EEPROM
LOADS
DS1881
Dual NV Audio Taper Digital Potentiometer
Pin Description
PINNAMEFUNCTIONGNDGround
2A2
3A1I2C Address Inputs. Inputs A0, A1, and A2 determine the I2C slave address of the device.N.C.No Connection
5A0I2C Address Input. Inputs A0, A1, and A2 determine the I2C slave address of the device.W0Wiper Terminal for Potentiometer 0L0Low Terminal for Potentiometer 0H0High Terminal for Potentiometer 0L1Low Terminal for Potentiometer 1H1High Terminal for Potentiometer 1W1Wiper Terminal for Potentiometer 1CEChip Enable. Enables SDA and SCL pins for I2C communication.SDAI2C Serial-Data Open-Drain I/OSCLI2C Serial-Clock InputVCCAnalog Voltage SupplyVDDDigital Voltage Supply
THD+N vs. FREQUENCY (0dB)
DS1881 toc12
FREQUENCY (kHz)
THD+N (%)10.1
CROSSTALK vs. FREQUENCY (-6dB)
DS1881 toc13
FREQUENCY (kHz)
CROSSTALK (dB)10.1
0.01100ypical Operating Characteristics (continued)
(VDD= VCC= +5.0V, TA= +25°C.)
DS1881
Dual NV Audio Taper Digital Potentiometer
DECODERPOTENTIOMETER 0
VALUE
CONFIGURATION
REGISTER
POTENTIOMETER
SETTING
REGISTERS
GND
ZERO-CROSSING
DETECTOR
UPDATEUPDATE2C
INTERFACE
SDA
SCL
VCC
VCC
VDD
VDD
GND
ZERO-CROSSING
DETECTOR
POTENTIOMETER 1
VALUE
DS1881
Block Diagram
DS1881
Dual NV Audio Taper Digital Potentiometer
Detailed Description
The DS1881 is a dual-channel, digitally controlled,
audio potentiometer. The Block Diagramillustrates the
features of the DS1881. The following sections discuss
these features in detail.
Potentiometer Configurations
The DS1881 potentiometers have two possible attenua-
tion configuration options. The Configuration Register
section discusses how to change between the two
options. Note that both potentiometers are always set to
the same option.
The factory default for both potentiometers is Option 1
(see Table1). Option 1 provides 64 positions with 1dB
attenuation per step for positions 0 through 62 and
mute as position 63. Option 2 (see Table2) is a 34-
position configuration. From position 0, the first 12
steps have 1dB attenuation per step, the next 12 have
2dB attenuation per step, and the following 8 steps
have 3dB attenuation per step. The last position, posi-
tion 33, is the mute setting.
Zero-Crossing Detection
Zero-crossing detection is a user-selectable feature
used to help eliminate clicking or popping noises dur-
ing changes of potentiometer settings. See the
Configuration Registersection to learn how to enable
the zero-crossing detection feature.
After the I2C master issues a command to change the
wiper position and the DS1881 has responded with an
acknowledge (ACK) to the command, the DS1881 has
a 50ms window to change the wiper position. The
DS1881 constantly monitors the voltage of the high and
low terminals of both potentiometers. During the 50ms
window, if the zero-crossing detection is enabled, then
each potentiometer’s wiper will change position if the
high and low terminals of the same potentiometer
become equal in potential (i.e., the magnitude of the
input signal is zero). If a zero-crossing event does not
occur within the 50ms window, then the wiper is
allowed to change to the new position regardless of the
state of the input signal. When the zero-crossing detec-
tion feature is not enabled, the DS1881 will allow wiper
movement as soon as the DS1881 has issued the
acknowledge to the master-controlling device.
Table1. Configuration Option 1
TAP POSITIONATTENUATION (dB)
00404142434445464748495051525354555657585960616280

Partno	Mfg	Dc	Qty	Available	Descript
DS1881	DALLAS	N/a	260	avai	Dual NV Audio Taper Digital Potentiometer