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DS1666 Audio Digital Resistor
www.dalsemi.com
FEATURES
128 position, digitally controlled potentiometer Operates from a +5 volts power supply with TTL signal inputs Wide analog voltage range of 5 volts Low-power CMOS 14-pin DIP or 16-pin SOIC for surface mount applications Default 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: -40C to +85C
Resistance/Step Resistance values Low End High End DS1666-10 10K 24 152 DS1666-50 50K 122 759 DS1666-100 100K 243 1.519
PIN ASSIGNMENT
NC U/D INC CS GND NC NC 1 2 3 4 5 6 7 14 13 12 11 10 9 8 NC VCC VB VW VH VL NC
14-PIN DIP (300 MIL) See Mech. Drawings Section
U/D NC NC INC NC CS NC GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC NC VB VW VH NC NC VL
-3dB Point 1.0 MHz 200 kHz 100 kHz
16-PIN SOIC (300 MIL) See Mech. Drawings Section
PIN DESCRIPTIONS
VH VL VW U/ D
INC CS
NC VCC GND VB
-
High Terminal of Potentiometer Low Terminal of Potentiometer Wiper Terminal of Potentiometer Up/Down Control Wiper Movement Control Chip Select for Wiper Movement No Connection 5V Power Supply Input Ground Substrate Bias Voltage (0 to -5V)
DESCRIPTION
The 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 multiplexed to the wiper. The position of the wiper on the resistance array is controlled by the CS , U/ D and INC inputs. The taper of the DS1666 is shown in Figure 1. 1 of 9 102899
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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 lower resolution gain required for high volume amplification.
GRAPH OF AUDIO TAPER Figure 1
OPERATION
The DS1666 has a total of 128 tap-points including the VL and VH terminals. A total of 127 resistive segments 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 CHARACTERISTICS
The 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 total resistance 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
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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 less than 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 control port. Voltage applied to the wiper cannot exceed the power-supply voltage, VCC, or go below the negative bias (VB).
CS - 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.
U/ 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.
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BLOCK DIAGRAM Figure 2
MODE SELECTION Figure 3
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ABSOLUTE MAXIMUM RATINGS*
Voltage on CS , INC , U/ D and U/ D and VCC Relative to Ground Voltage on VH, VL and VW Relative to Ground Voltage on VB Operating Temperature Storage Temperature Soldering Temperature -0.5V to +7.0V -6.5V to +6.5V -6.5V to GND -40 to +85C -55C to +125C 260C 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
PARAMETER Supply Voltage Input Logic 1 Input Logic 0 VH, VL, VW Voltage VB Voltage SYMBOL VCC VIH VIL VR VB MIN +4.5 2.0 -0.5 VB-0.3 -5.5 TYP 5.0 MAX 5.5 VCC+0.5 +0.8 VCC+0.3 GND
(-40C to +85C)
UNITS V V V V V NOTES 1 1 1 1, 3 1
DC ELECTRICAL CHARACTERISTICS
PARAMETER Supply Current Input Leakage Wiper Resistance Wiper Current SYMBOL ICC ILI RW IW -1 MIN
(-40C to +85C; VCC = 5.0V 10%)
TYP 0.2 MAX 4.5 +1 350 900 1 UNITS mA A mA 2 NOTES 4
CAPACITANCE
PARAMETER Capacitance SYMBOL CIN CONDITION tA=25C TYP 6 MAX pF
(tA=25C)
UNITS NOTES
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ANALOG RESISTOR CHARACTERISTICS (-40C to +85C; VCC = 5.0V 10%)
PARAMETER Total Resistance "-10" "-50" "-100" End-to-End Resistor Tolerance Absolute Tolerance Low End (0.25% Increments) High End (1.5% Increments) -3 dB Cutoff Frequency Temperature Coefficient fCUTOFF 750 -0.5 -2.0 +0.5 +2.0 % % MHz ppm/C 6 6 7 -20 10 50 100 +20 K K K % 5 5 5 8 SYMBOL MIN TYP MAX UNITS NOTES
AC ELECTRICAL CHARACTERISTICS
PARAMETER
CS
(-40C to +85C; VCC = 5.0V 10%)
TYP MAX UNITS ns ns s ns s 200 ns NOTES 100 100 1 500 1
SYMBOL tCI tID tDI tIL tIH tIW
MIN
to INC Setup
INC High to U/ D Change
U/ D to INC Setup
INC Low Period INC High Period INC Low to Wiper Change
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AC TIMING Figure 4
NOTES:
1. All Voltages are referenced to ground. 2. Typical Values are for TA=25C and nominal supply voltages. 3. Resistors input voltages cannot go below VB or exceed VCC by the amounts shown. 4. Maximum current specifications are based on the clock rate of INC input. represents the current required when changing the wiper position. This specification
5. The DS1666 is available in three end-to-end resistor values. These include 10K for the DS1666-10; 50K for the DS1666-50; and 100K for the DS1666-100. 6. Absolute tolerance is used to compare measured wiper voltage versus expected wiper voltage as determined by wiper position. 7. -3dB cutoff frequency characteristics for the DS1666 depend on potentiometer total resistance. The DS1666-10 is 1 MHz; the DS1666-50 is 200 KHz; and the DS1666-100 is 100 KHz. 8. Valid at 25C only
AC TEST CONDITIONS
Input Pulse Levels Input Rise and Fall Times 0V to 3V 10 ns
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DS1666 ORDERING INFORMATION
ORDERING NUMBER DS1666-010 DS1666-050 DS1666-100 DS1666S-010* DS1666S-050* PACKAGE 14L DIP 14L DIP 14L DIP 16L SOIC (300-mil) 16L SOIC (300-mil) OPERATING TEMPERATURE -40C TO +85C -40C TO +85C -40C TO +85C -40C TO +85C -40C TO +85C -40C TO +85C VERSION 10 k 50 k 100 k 10 k 50 k 100 k
DS1666S-100* 16L SOIC (300-mil) * Add "/T & R" for tape and reel packaging.
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DATA SHEET REVISION SUMMARY
The following represent the key differences between 07/26/93 and 06/18/97 version of the DS1666 data sheet. Please review this summary carefully. 1. Remove commercial temp grade reference. 2. Add order info table. 3. Improve operating description and add "ANALOG Resistor CHARACTERISTICS".
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