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| DS1666, DS1666S DS1666, DS1666S Audio Digital Resistor FEATURES 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 * 128 position, digitally controlled potentiometer * Operates from a +5 volts power supply with TTL signal inputs * Wide analog voltage range of 5 volts * Resistive elements are temperature compensated to 20 percent end to end * Low-power CMOS * 14-pin DIP or 16-pin SOIC for surface mount applications 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 * Default position on power up sets wiper position at 10% * Operating temperature range - -40C to +85C; industrial Resolution/Step Resistance values Low End High End -3dB Point DS1666-10 10K 24 152 1.1 MHz DS1666-50 50K 122 759 200 KHz DS1666-100100K 243 1.519K 100 KHz 16-PIN SOIC (300 MIL) See Mech. Drawings Section PIN DESCRIPTION VH VL VW U/D INC CS NC VCC GND VB - - - - - - - - - - High Terminal of Resistor Low Terminal of Resistor Wiper Terminal of Resistor Up/Down Control Wiper Movement Control Chip Select for Wiper Movement No Connection +5 Volts Ground 0 to -5 Volts DESCRIPTION The DS1666 is a solid-state potentiometer which is set to value by digitally controlled resistive elements. The potentiometer is composed of 127 resistive sections. Between each resistive section and both ends of the potentiometer are TAP points accessible to the wiper. The position of the wiper on the resistance array is controlled by the CS, U/D and INC inputs. The position of the wiper defaults to the 10% position on power up. The resolution of the DS1666 is shown in Figure 1. The DS1666 Digital Audio Resistor is uniquely designed to provide a potentiometer that is 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. 022698 1/7 DS1666, DS1666S GRAPH OF AUDIO TAPER Figure 1 100 90 80 70 PERCENT TOTAL RESISTANCE 60 1 50 40 30 20 1 10 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 2 3 LOW TERMINAL % OF ACTIVE DIGITAL TAPS HIGH TERMINAL OPERATION The CS, U/D and INC inputs control the position of the wiper along the resistor array (Figure 1). When CS is active (low), a high to low transition on the INC will increment or decrement an internal counter depending on the level of the U/D pin. When the U/D pin is low, the counter will decrement. When the U/D pin is high, the counter will increment. The state of the U/D pin can be changed while CS is active allowing for precise adjustment during calibration. The output of the counter is decoded to set the position of the wiper. When the CS input transitions to the high (inactive) level, the value of the counter is stored and the wiper position is maintained until power (VCC) is lost. When power is restored, the DS1666 returns to the default setting and positions the wiper to 10 percent. The value of the end-to-end and end-to-wiper position is indeterminate while VCC is not applied. The DS1666 has a resistor array that resembles an audio taper potentiometer as shown in Figure 1 1. Since the taper is not linear, exact resistance values for each of the 128 positions of the resistor is not specified. However, the end-to-end resistance is specified to be within 20 percent of the stated resistor value over an industrial temperature range of -40C to +85C. ANALOG CHARACTERISTICS End-to-End Resistance Tolerance = 20 percent Typical Noise = <120 dB/Hz REF:IV Temperature Coefficient = 800 PPM/C typical Resistance at tap #74=18% 2% of total resistance. PIN DESCRIPTIONS VH The high end of the potentiometer. This terminal is capable of handling input voltages between 5 volts. The Low end of the potentiometer. This terminal is capable of handling input voltages between 5 volts. The wiper terminal of the potentiometer. The value of the wiper is controlled by the U/D and the INC pins. The U/D input controls the direction of the wiper movement when setting the potentiometer. Toggling INC will move the potentiometer wiper by either incrementing or decrementing the counter. VL VW Up/Down (U/D) Increment (INC) Chip Select The device is selected when CS input is (CS) low. The current counter value is stored when CS is returned high. 022698 2/7 DS1666, DS1666S BLOCK DIAGRAM Figure 2 TRANSFER LOGIC ARRAY VH U/D INC CS 7 BIT COUNTER WIPER POSITION DECODE 1 OF 128 VL VW MODE SELECTION Figure 3 CS L L H INC U/D H L X MODE WIPER UP WIPER DOWN STORE WIPER POSITION 022698 3/7 DS1666, DS1666S ABSOLUTE MAXIMUM RATINGS* Voltage on CS, INC, 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 Ground -40C 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 1 DC ELECTRICAL CHARACTERISTICS PARAMETER Supply Current Input Leakage Wiper Resistance Wiper Current SYMBOL ICC ILI RW IW -1 350 MIN TYP 0.1 (-40C to +85C; VCC = 5.0V 10%) MAX 5 +1 650 1 UNITS mA A mA 3 NOTES 3 2 CAPACITANCE PARAMETER Capacitance SYMBOL CIN CONDITION tA=25C TYP 6 MAX 10 UNITS pF (tA = 25C) NOTES 2 022698 4/7 DS1666, DS1666S AC ELECTRICAL CHARACTERISTICS PARAMETER CS to INC Setup INC High to U/D Change U/D to INC Setup INC Low Period INC High Period INC Inactive to CS Inactive CS Deselect Time SYMBOL tCI tID tDI tIL tIH tIC tCPH MIN 100 100 1 500 1 500 100 (tA=-40C to +85C; VCC=+5V 10%) TYP MAX UNITS ns ns s ns s ns ns NOTES AC TIMING Figure 4 CS tCI tIL tIH INC tIC tCPH tID tDI U/D tIW VW VVH VVL NOTES: 1. All voltages are referenced to ground. 2. This parameter is periodically sampled and not 100% tested. 3. Typical values are for tA = 25C and nominal supply voltages. 4. Wiper output open circuited. AC TEST CONDITIONS Input Pulse Levels Input Rise and Fall Times Input Level 0V to 3V 10 ns 1.5V 022698 5/7 DS1666, DS1666S DS1666 ORDERING INFORMATION ORDERING NUMBER DS1666-010 DS1666-050 DS1666-100 DS1666S-010 DS1666S-050 DS1666S-100 PACKAGE 14L DIP 14L DIP 14L DIP 16L SOIC (300 MIL) 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 10K 50K 100K 10K 50K 100K VERSION 022698 6/7 DS1666, DS1666S 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 022698 7/7 |
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