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DS1805Z-010-DS1805Z-010+
Addressable Digital Potentiometer
General DescriptionThe DS1805 addressable digital potentiometer contains
a single 256-position digitally controlled potentiometer.
Device control is achieved through a 2-wire serial inter-
face. Device addressing is provided through three
address inputs that allow up to eight devices on a sin-
gle 2-wire bus. The exact wiper position of the poten-
tiometer can be written or read. The DS1805 is
available in 16-pin SO and 14-pin TSSOP packages.
The device is available in three standard resistance val-
ues: 10kΩ, 50kΩ, and 100kΩ. The DS1805 is specified
over the industrial temperature range. The DS1805
provides a low-cost alternative for designs based on
the DS1803, but require only a single potentiometer.
ApplicationsCCFL Inverters
PDAs and Cell Phones
Portable Electronics
Multimedia Products
Instrumentation and Industrial Controls
Features3V or 5V OperationLow Power ConsumptionOne Digitally Controlled, 256-Position
PotentiometerCompatible with DS1803-Based Designs14-Pin TSSOP (173mil) and 16-Pin SO (150mil)
Available for Surface-Mount ApplicationsThree Address InputsSerial 2-Wire BusOperating Temperature Range
Industrial: -40°C to +85°CStandard Resistance Values
DS1805-010: 10kΩ
DS1805-050*: 50kΩ
DS1805-100*: 100kΩ
DS1805
Addressable Digital Potentiometer
Pin ConfigurationsOrdering InformationXX-XXXX; Rev 0; 4/02
Add “/T&R” for tape-and-reel orders.
*Future product.
DS1805
Addressable Digital Potentiometer
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED DC OPERATING CONDITIONSStresses 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 Any Pin Relative to Ground.................-0.5V to +6.0V
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-55°C to +125°C
Soldering Temperature............................................See IPC/JEDEC
J-STD-020A Specification
DC ELECTRICAL CHARACTERISTICS
DS1805
Addressable Digital Potentiometer
ANALOG RESISTOR CHARACTERISTICS(VCC= 2.7V to 5.5V, TA= -40°C to +85°C)
AC ELECTRICAL CHARACTERISTICS
DS1805
Addressable Digital Potentiometer
Note 1:All voltages are referenced to ground.
Note 2:ICCspecified with SDA pin open. SCL = 400kHz clock rate.
Note 3:Address inputs A0, A1, and A2 should be connected to either VCCor GND, depending on the desired address selections.
Note 4:I/O pins of fast mode devices must not obstruct the SDA and SCL lines if VCCis switched off.
Note 5:ISTBYspecified with SDA = SCL = VCC= 5.0V.
Note 6:Valid at +25°C only.
Note 7:Absolute linearity is used to determine wiper voltage versus expected voltage as determined by wiper position.
Note 8:Relative linearity is used to determine the change in voltage between successive tap positions.
Note 9:-3dB cutoff frequency characteristics for the DS1805 depend on potentiometer total resistance: DS1805-010, 1MHz;
DS1805-50, 200kHz; DS1805-100, 100kHz.
Note 10:A fast mode device can be used in a standard mode system, but the requirement tSU:DAT> 250ns must then be met. This
will automatically be 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 tRMAX + tSU:DAT= 1000ns + 250ns =
1250ns before the SCL line is released.
Note 11:After this period, the first clock pulse is generated.
Note 12:The maximum tHD:DAThas only to be met if the device does not stretch the low period (tLOW) of the SCL signal.
Note 13:A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the VIHMINof the SCL signal)
in order to bridge the undefined region of the falling edge of SCL.
Note 14:CB—total capacitance of one bus line in picofarads, timing referenced to (0.9)(VCC) and (0.1)(VCC).
AC ELECTRICAL CHARACTERISTICS(VCC= 2.7V to 5.5V, TA= -40°C to +85°C)
Typical Operating Characteristics(VCC= 5.0V, TA= +25°C, unless otherwise noted.)
DS1805
Addressable Digital Potentiometer
DS1805
Addressable Digital Potentiometer
Detailed DescriptionThe DS1805 addressable digital potentiometer contains a
single 256-position digitally controlled potentiometer.
Device control is achieved through a 2-wire serial inter-
face. Device addressing is provided through three
address inputs that allow up to eight devices on a single
2-wire bus. The exact wiper position of the potentiometer
can be written or read. The DS1805 is available in 16-pin
SO and 14-pin TSSOP packages. The device is available
in three standard resistance values: 10kΩ, 50kΩ, and
100kΩ. The DS1805 specified over the industrial temper-
ature range. The DS1805 is provides a low-cost alterna-
tive for designs based on the DS1803, but require only a
single potentiometer.
Device OperationThe DS1805 is an addressable, digitally controlled
device that has a single 256-position potentiometer.
Figure1 shows a block diagram of the part.
Communication and control of the device is accom-
plished through a 2-wire serial interface that has SDA
and SDL signals. Device addressing is attained using
the device chip-select inputs A0, A1, and A2.
