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DS1882 ,Dual Log Audio Digital PotentiometerApplications♦ 16-Pin TSSOP or SO PackageNotebook and PC AudioPortable Audio EquipmentOrdering Infor ..
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DS1882
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 (VCC) and the
communication circuitry (VDD). 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.
Applications
Notebook and PC Audio
Portable Audio Equipment
Car Stereo
Consumer Audio/Video
FeaturesDual, Audio Log Taper PotentiometersLow THD+N and Crosstalk±7V Analog Supply (Independent of Digital
Supply)5V Digital SupplyPotentiometer Settings Configurable as
Nonvolatile 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
I2C Bus45kΩPotentiometer End-to-End ResistanceIndustrial Temperature Range (-40°C to +85°C)16-Pin TSSOP or SO Package
DS1882
Dual Log Audio Digital Potentiometer
VDD
VCC
SCL
SDAV-
GND
TOP VIEWL08L1H0
TSSOP/SO
DS1882
Pin Configuration
Rev 0; 6/06
+Denotes lead-free package.
Ordering Information
PARTTEMP
RANGE
VERSION
(kΩ)
PIN-
PACKAGE
DS1882E-050+-40°C to +85°C4516 TSSOP
(173 mils)
DS1882E-050+T&R-40°C to +85°C45
16 TS S O P 173 m i l s)
Tap e- and - Reel
DS1882Z-050+-40°C to +85°C4516 S O 150 m i l s)
DS1882Z-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.
DS1882
Dual Log Audio 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 +8.0V
Voltage on H1, H0, W1, W0, L1, and L0 Relative
to GND............................................(V- - 0.5V) to (VCC + 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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Digital Supply VoltageVDD(Notes 1, 2)4.55.5V
Analog Supply RangeVCC(Notes 1, 2)4.57.0V
Negative Supply VoltageV-(Notes 1, 2)-7.0-4.5V
Potentiometer Voltages-VVCCV
Wiper Current±1mA
DC ELECTRICAL CHARACTERISTICS
(VDD= +4.5V to +5.5V, VCC= +4.5V to +7.0V, V- = -4.5V to -7.0V, TA= -40°C to +85°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Digital Supply CurrentIDD(Note 3)0.25µA
Analog Supply CurrentICC(Note 4)2.510µA
Input Logic 0
(CE, SDA, SCL, A0, A1, A2)VIL(Note 5)-0.30.15 x
VDDV
Input Logic 1
(CE, SDA, SCL, A0, A1, A2)VIH(Note 5)0.8 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 VDD)-10+10µA
I/O CapacitanceCI/O(Note 6)10pF
Power-Up TimetPU1ms
DS1882
Dual Log Audio Digital Potentiometer2C CHARACTERISTICS (See Figure 4)
(VDD= +4.5V to +5.5V, VCC= +4.5V to +7.0V, V- = -4.5V to -7.0V, 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:DAT200ns
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= +4.5V to +5.5V, VCC= +4.5V to +7.0V, V- = -4.5V to -7.0V, 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 Attenuation100dB
Step Size Deviation from Nominal(Note 7)-0.25+0.25dB
Interchannel Matching(Note 7)-0.5+0.5dB
-3dB Cutoff Frequency10pF load5MHz
Output Noise20Hz to 20kHz, grounded input,
tap = -6dB2.2µVRMS
Crosstalk1kHz, grounded input, tap = -6dB-120dB
THD+N1kHz, tap = -6dB, CL = 10pF
(Note 8)0.005%
Zero-Crossing DetectiontZCD3850ms
POTENTIOMETER 0 (CONFIGURATON 1)
ATTENUATION vs. SETTING
DS1882 toc01
SETTING (DEC)
ATTENUATION (dB)453627189
POTENTIOMETER 0 (CONFIGURATON 2)
ATTENUATION vs. SETTING
DS1882 toc02
SETTING (DEC)
ATTENUATION (dB)2418126
POTENTIOMETER 1 (CONFIGURATON 1)
ATTENUATION vs. SETTING
DS1882 toc03
SETTING (DEC)
ATTENUATION (dB)3618
DS1882
Dual Log Audio Digital Potentiometer
NV MEMORY CHARACTERISTICS
(VDD= +4.5V to +5.5V, VCC= +4.5V to +7.0V, V- = -4.5V to -7.0V, 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 DS1882 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.
Typical Operating Characteristics
(VDD= VCC= +5.0V, V- = -5.0V, TA= +25°C.)
DS1882
Dual Log Audio Digital Potentiometer
POTENTIOMETER 1 (CONFIGURATON 2)
ATTENUATION vs. SETTING
DS1882 toc04
SETTING (DEC)
ATTENUATION (dB)2418126
END-TO-END RESISTANCE PERCENT
CHANGE FROM +25°C vs. TEMPERATURE
TEMPERATURE (°C)
RESISTANCE % CHANGE (FROM +25
DS1882 toc05
POTENTIOMETER 1
POTENTIOMETER 0
RESISTANCE vs. POWER-UP VOLTAGE
DS1882 toc06
POWER-UP VOLTAGE (V)
RESISTANCE (k4321
PROGRAMMED
RESISTANCE (6dBh)
MUTE
HIGH IMPEDANCE
RESISTANCE
vs. POWER-DOWN VOLTAGE
DS1882 toc07
POWER-DOWN VOLTAGE (V)
RESISTANCE (k4321
PROGRAMMED
RESISTANCE (6dBh)
MUTE
HIGH IMPEDANCE
ICC vs. ZERO-CROSSING TIMING
DS1882 toc08
TIME (ms)
ZERO-CROSSING
TIMEOUT OR ZERO-
CROSSING EVENT
ZERO-CROSSING
DETECTION
ACTIVATED
TYPICAL
TIMEOUT
OF 50ms
CROSSTALK vs. FREQUENCY (-6dB)
FREQUENCY (kHz)
CROSSTALK (dB)
DS1882 toc10
0.010.101.0010.00100.00ypical Operating Characteristics (continued)
(VDD= VCC= +5.0V, V- = -5.0V, TA= +25°C.)
THD+N vs. FREQUENCY (0dB)
DS1882 toc09
FREQUENCY (kHz)
THD+N (%)
0.01100.00
DS1882
Dual Log Audio Digital Potentiometer
DECODERPOTENTIOMETER 0
VALUE
CONFIGURATION
REGISTER
POTENTIOMETER
SETTING
REGISTERSGND
ZERO-CROSSING
DETECTOR
UPDATEUPDATE
I2C
INTERFACE
SDA
SCL
VCC
VCC
VDD
VDD
GND
ZERO-CROSSING
DETECTOR
POTENTIOMETER 1
VALUEDS1882
Block Diagram
Pin Description
PINNAMEFUNCTIONGNDGround
2A2
3A1I2C Address Inputs. Inputs A0, A1, and A2 determine the I2C slave address of the device.V-Negative Analog Voltage Supply
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
DS1882
Dual Log Audio Digital Potentiometer
Detailed Description
The DS1882 is a dual-channel, digitally controlled,
audio potentiometer. The Block Diagramillustrates the
features of the DS1882. The following sections discuss
these features in detail.
Potentiometer Configurations
The DS1882 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 Table 1). Option 1 provides 64 positions with 1dB
attenuation per step for positions 0 through 62 and
mute as position 63. Option 2 (see Table 2) 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 DS1882 has responded with an
acknowledge (ACK) to the command, the DS1882 has
a 50ms window to change the wiper position. The
DS1882 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 DS1882 will allow wiper
movement as soon as the DS1882 has issued the
acknowledge to the master-controlling device.
Table 1. Configuration Option 1
TAP POSITIONATTENUATION (dB)
00404142434445464748495051525354555657585960616290
DS1882
Dual Log Audio Digital Potentiometer
Command Byte
The Command Byte determines both the potentiometer
wiper settings and the configuration of both poten-
tiometers. This is done by setting the two MSBs of the
Command Byte to one of three values. If 00 is set as
the value for the two MSBs, then the wiper setting for
Potentiometer 0 is to be programmed. If 01 is set as the
value, then the wiper setting of Potentiometer 1 is to be
programmed. See the Potentiometer Wiper Settingsec-
tion for more details about writing the wiper setting. A
value of 10 indicates that the Configuration Register is
to be programmed. A value of 11 is reserved and is not
to be used. See the Configuration Registersection for
more information. Any values other than the three dis-
cussed above will result in no action by the part. See
below for the Command Byte structure.
Table 2. Configuration Option 2
TAP POSITIONATTENUATION (dB)101112141618202224262830323436394245485154576090
MSB
CONFIGURATION
SELECTION
REGISTER
SETTINGS
LSB
Command Byte Structure

Partno	Mfg	Dc	Qty	Available	Descript
DS1882	MAXIM	N/a	500	avai	Dual Log Audio Digital Potentiometer
DS1882	DS	N/a	7	avai	Dual Log Audio Digital Potentiometer