DS1866Z ,Log Trimmer PotentiometerPIN DESCRIPTIONSV - Power Supply Terminal. The DS1866 will support supply voltages ranging from +2. ..
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DS1866Z
Log Trimmer Potentiometer
FEATURES Single 8-position Log Trimmer Potentiometer
5-dB/step Operates from 2.7V to 5.5V supplies Parallel interface control: P0, P1, P2 Standard Resistance Value: 10 kW 8-pin DIPs; 8-pin (150) SOICs Operating Temperature Range:
- Industrial: -40°C to +85°C
PIN ASSIGNMENT
PIN DESCRIPTION- High End of Resistor- Low End of Resistor- Wiper Terminal
VCC- 3V or 5V Power Supply InputP0- Position Select - Bit 0- Position Select - Bit 1- Position Select - Bit 2
GND- Ground
DESCRIPTIONThe DS1866 Log Trimmer Potentiometer is a single volatile digital potentiometer having eight positions
with a 5-dB resolution per step. The device provides an ideal method for low-cost trimming or volume
control using a CPU or manual control input. The device’s wiper position is set to one of eight positions
by a 3-terminal parallel port. The value of the wiper position is determined by the P0, P1, and P2 portpins.
The DS1866 is available as a 10k potentiometer and is available in an industrial temperature grade.
Additionally, the DS1866 will operate from 3V or 5V supplies and is ideal for portable applications
requiring low standby current. Two packaging options are available and include the 8-pin (300-mil) DIP,
8-pin (150-mil) SOIC.
Log Trimmer Potentiometer8-Pin DIP (300-mil)See Mech. Drawings Section
GND
VCC
GND
VCC
8-Pin SOIC (150-mil)
See Mech. Drawings Section
DS1866
OPERATIONThe DS1866 is a single volatile potentiometer. The device has a total of eight positions providing aresolution of 5 dB per step and giving a total attenuation range of 0 dB to -35 dB. These tap points are
accessible to the W-terminal whose position is controlled via a 3-terminal parallel port consisting of input
signals P0, P1, and P2. A block diagram of the DS1866 is shown in Figure 1.
Wiper position setting of the DS1866 is determined by the states of the P0, P1, and P2 input terminals.
Table 1 below outlines position setting versus value of the parallel port inputs. A Position-0 setting placesthe wiper position at the L-terminal of the potentiometer and provides 35 dB of attenuation. As wiper
position increases, attenuation decreases with Position-7 giving 0 dB of attenuation.
On power-up, the wiper position of the DS1866 will be set to the P0, P1, and P2 values.
PIN DESCRIPTIONS
VCC - Power Supply Terminal. The DS1866 will support supply voltages ranging from +2.7 to +5.5volts.
GND - Ground Terminal.
H - High-end Resistor. This is the high-end terminal of the potentiometer. It is not required that thisterminal be connected to a potential greater than the L-terminal. Maximum voltage on the H-terminal can
not exceed the power supply voltage, VCC, or go below ground.
L - Low-end Resistor. This is the low-end terminal of the potentiometer. It is not required that this
terminal be connected to a potential less than the H-terminal. Maximum voltage on the L-terminal can notexceed the power-supply voltage, VCC, or go below ground.
W - Wiper of the Potentiometer. This pin is the wiper terminal of the potentiometer. Its position on theresistor array is controlled by the 3-terminal parallel port. Maximum voltage on the W-terminal can not
exceed the power supply voltage, VCC, or go below ground.
P0 - Bit 0. P0 is the bit 0 data input to the parallel port.
P1 - Bit 1. P1 is the bit 1 data input to the parallel port.
P2 - Bit 2. P2 is the bit 2 data input to the parallel port.
DS1866
One Time Programmability (OTP). The DS1866 can be easily used as an OTP device. This can beaccomplished by terminating the P0, P1, or P2 to desired logic levels during system manufacturing. On
power up, the value of P0, P1, and P2 will then set the wiper position setting of the DS1866.
DS1866 BLOCK DIAGRAM Figure 1
DS1866
ABSOLUTE MAXIMUM RATINGS*Voltage on Any Pin Relative to Ground -0.5V to +7.0VOperating Temperature -40°C to +85°C
Storage Temperature -55°C to +125°C
Soldering Temperature 260°C for 10 secondsThis is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure toabsolute maximum rating conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS(-40°C to +85°C)
DC ELECTRICAL CHARACTERISTICS(-40°C to +85°C; VCC = 2.7V to 5.5V)
ANALOG RESISTOR CHARACTERISTICS(-40°C to +85°C; VCC = 2.7V to 5.5V)
CAPACITANCE(25°C; VCC = 2.7V to 5.5V)
AC ELECTRICAL CHARACTERISTICS(-40°C to +85°C; VCC = 2.7V to 5.5V)
DS1866
NOTES:1. All voltages are referenced to ground.
2. For VCC = 5V ± 10% maximum VIL = +0.8V. For VCC 3.0 ± 10% VIL = +0.6V. For VCC =2.7 volts VIH
=2.0 volts minimum.
3. Resistor input voltages cannot go below ground or exceed VCC by the amounts as shown in the table.
4. Maximum current specifications are based on the change rate of the parallel port inputs P0, P1, andP2.
5. Standby current specifications apply when P0, P1, P2 logic inputs are driven within the specified VIH
or VIL levels.
6. Valid at 25°C only.
7. The end-to-end resistance tolerance of the DS1866 can be expected to shift with temperature.
However, this change will not exceed ±20% of the nominal resistor value of the part.
8. Absolute tolerance is used to compare measured wiper voltage versus expected wiper voltage as
determined by wiper position. The DS1866 is specified to provide an absolute tolerance of ±1.0 dB.
9. Tap-to-tap tolerance is used to determine the change in voltage between successive tap positions. The
DS1866 is specified to provide a tap-to-tap tolerance specification of ±1.0 dB.
10. -3 dB cutoff frequency characteristic for the DS1866 is 1 MHz.
11. Capacitance values apply at 25°C.
12. This specification refers to the time difference between parallel port input changes to stabilize a wiper
transition.
DS1866 ORDERING INFORMATION
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