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DS1666S
Audio Digital Resistor
FEATURES128 position, digitally controlled poten-
tiometerOperates from a +5 volts power supply with
TTL signal inputsWide analog voltage range of ±5 voltsLow-power CMOS14-pin DIP or 16-pin SOIC for surfacemount applicationsDefault position on power up sets wiper
position to 10% of active digital taps (3% of
the total end-to-end resistance)Operating temperature range– Industrial temp. range: -40°C to +85°C
Resistance/Step
Resistance values Low End High End -3dB PointDS1666-10 10K 24Ω 152Ω 1.0 MHz
DS1666-50 50K 122Ω 759Ω 200 kHz
DS1666-100 100K 243Ω 1.519Ω 100 kHz
PIN ASSIGNMENT
PIN DESCRIPTIONS-High Terminal of Potentiometer-Low Terminal of Potentiometer-Wiper Terminal of PotentiometerD-Up/Down Control
INC-Wiper Movement Control-Chip Select for Wiper Movement-No Connection
VCC-5V Power Supply Input
GND-Ground- Substrate Bias Voltage (0 to -5V)
DESCRIPTIONThe DS1666 Audio Digital Resistor is a solid-state potentiometer composed of 127 digitally controlled
resistive elements. Between each resistive section and both ends of the potentiometer are tap points
DS1666U/D
INC
GND
VCC
14-PIN DIP (300 MIL)
See Mech. Drawings Section
16-PIN SOIC (300 MIL)
See Mech. Drawings Section
U/DVCC
INC
GND
DS1666
The DS1666 is uniquely designed to provide a potentiometer that is pseudo-logarithmic rather than linear
across its entire range. The lower half of the potentiometer advances 1% of total resistance for each 3%
of scale advanced, providing for precise amplification of low volume signals. The upper half of the
potentiometer advances 2% of resistance for every 1% of scale advanced, providing for the lowerresolution gain required for high volume amplification.
GRAPH OF AUDIO TAPER Figure 1
OPERATIONThe DS1666 has a total of 128 tap-points including the VL and VH terminals. A total of 127 resistivesegments exist between the VL and VH terminals. These tap-points are accessible to the VW terminal
whose position is controlled via a 3-terminal control port. A block diagram of the DS1666 is shown in
Figure 2.
The 3-terminal port of the DS1666 provides an increment/ decrement interface which is activated via a
chip select input. This interface consists of the input signals CS, INC, and U/D. These input signals
control a 7-bit up/down counter. The output of the 7-bit up/down counter controls a 1 of 128 decoder to
select wiper position. The timing diagram for the 3-terminal interface control is shown in Figure 4.
ANALOG CHARACTERISTICSThe DS1666 has a pseudo-logarithmic resistor array that resembles an audio taper potentiometer as
shown in Figure 1. Taps on the lower portion of the potentiometer increment 0.25% of the totalresistance and are specified to within ±0.5% of the expected value. Taps on the higher portion increment
1.5% of the total resistance and are specified to within ±2.0% of the expected value.
End-to-End Resistance Tolerance = ±20 %
Temperature Coefficient = 750 PPM/°C typical
DS1666
PIN DESCRIPTIONS
VCC - Power Supply. The DS1666 will support supply voltages ranging from +4.5 to +5.5 volts.
GND - Ground Terminal.
VB - Negative Bias. The DS1666 will support a negative bias ranging from 0 to -5 volts.
H - High-Terminal of Potentiometer. It is not required that this terminal be connected to a potential
greater than the VL terminal. Voltage applied to the VH terminal can not exceed the power-supply
voltage, (VCC), or go below the negative bias, (VB).
VL - Low-Terminal of Potentiometer. It is not required that this terminal be connected to a potential lessthan the VH terminal. Voltage applied to the VL terminal cannot exceed the power-supply voltage, (VCC),
or go below the negative bias (VB).
VW - Wiper of the Potentiometer. Its position on the resistor array is controlled by the 3-terminal controlport. Voltage applied to the wiper cannot exceed the power-supply voltage, VCC, or go below thenegative bias (VB).
- Chip Select. The CS input is used to activate the control port of the DS1666. This input is active
low. When in a high-state, activity on the INC and U/D port pins will not affect or change wiper
position.
INC - Wiper Movement Control. This input provides for wiper position changes when the CS pin is low.
Wiper position changes will occur one position per high-to-low transition of this input signal. Position
changes will not occur if the CS pin is in a high-state.
D - Up/Down Control. This input sets the direction of wiper movement. When in a high-state and CS
is low, any high-to-low transition on INC will cause a one position movement of the wiper towards the
VH terminal. When in a low-state and CS is low, any high-to-low transitions on INC will cause the
position of the wiper to move towards the VL terminal.
DS1666
BLOCK DIAGRAM Figure 2
MODE SELECTION Figure 3
DS1666
ABSOLUTE MAXIMUM RATINGS*Voltage on CS, INC, U/Dand U/D and VCC Relative to Ground-0.5V to +7.0V
Voltage on VH, VL and VW Relative to Ground-6.5V to +6.5V
Voltage on VB-6.5V to GND
Operating Temperature-40° to +85°C
Storage Temperature-55°C to +125°C
Soldering Temperature260°C for 10 seconds
* This 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 to absolute
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 = 5.0V ± 10%)
CAPACITANCE (tA=25°C)
DS1666
ANALOG RESISTOR CHARACTERISTICS(-40°C to +85°C; VCC = 5.0V ± 10%)
AC ELECTRICAL CHARACTERISTICS(-40°C to +85°C; VCC = 5.0V ± 10%)
