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DS1666-100 Datasheet(PDF) 1 Page - Dallas Semiconductor |
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DS1666-100 Datasheet(HTML) 1 Page - Dallas Semiconductor |
1 / 7 page DS1666, DS1666S Audio Digital Resistor DS1666, DS1666S 022698 1/7 FEATURES • 128 position, digitally controlled potentiometer • Operates from a +5 volts power supply with TTL sig- nal inputs • Wide analog voltage range of ±5 volts • Resistive elements are temperature compensated to ±20 percent end to end • Low–power CMOS • 14–pinDIPor16–pinSOICforsurfacemountapplica- tions • Default position on power up sets wiper position at 10% • Operating temperature range – –40 °C to +85°C; industrial Resolution/Step Resistance values Low End High End –3dB Point DS1666–10 10K Ω 24 Ω 152 Ω 1.1 MHz DS1666–50 50K Ω 122 Ω 759 Ω 200 KHz DS1666–100100K Ω 243Ω 1.519K Ω 100 KHz PIN ASSIGNMENT 1 2 3 4 5 6 7 14 13 12 11 10 9 8 NC U/D INC CS GND NC NC NC VCC VB VW VH VL NC 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 U/D NC NC INC NC CS NC GND VCC NC VB VW VH NC NC VL 14–PIN DIP (300 MIL) See Mech. Drawings Section 16–PIN SOIC (300 MIL) See Mech. Drawings Section PIN DESCRIPTION VH – High Terminal of Resistor VL – Low Terminal of Resistor VW – Wiper Terminal of Resistor U/D – Up/Down Control INC – Wiper Movement Control CS – Chip Select for Wiper Movement NC – No Connection VCC – +5 Volts GND – Ground VB – 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 po- tentiometer 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 resolu- tion 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 po- tentiometer advances 1% of total resistance for each 3% of scale advanced, providing for precise amplifica- tion of low volume signals. The upper half of the poten- tiometer advances 2% of resistance for every 1% of scale advanced, providing for the lower resolution gain required for high volume amplification. |
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