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DS1800

Dallas Semiconducotr
Part Number DS1800
Manufacturer Dallas Semiconducotr
Description Dual Inverting Log Gain/Attenuator
Published Sep 19, 2005
Detailed Description DS1800 Dual Inverting Log Gain/Attenuator www.dalsemi.com FEATURES Ultra-low power consumption Operates from 3V or 5V s...
Datasheet PDF File DS1800 PDF File

DS1800
DS1800

Overview
DS1800 Dual Inverting Log Gain/Attenuator www.
dalsemi.
com FEATURES Ultra-low power consumption Operates from 3V or 5V supplies Two digitally controlled, 128-position potentiometers including mute Logarithmic gain characteristics Zero-crossing detection eliminates noise caused by discrete wiper changes Two control interfaces - 3-wire serial CPU control - Pushbutton control 20-pin DIP (300-mil), 20-pin SOIV (300mil), and 20-pin (173-mil) TSSOP packaging available Operating Temperature Range: - Industrial: -40°C to +85°C Software and hardware mute Standard Resistance Available: 53KΩ PIN ASSIGNMENT GND COUT CLK D RST ZCEN MODE W0 OUT0 IN0 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC P1G P1A P0G P0A MUTE AGND IN1 OUT1 W1 20-Pin DIP (300-mil) 20-Pin SOIC (300-mil) 20-Pin TSSOP See Mech.
Drawings Section PIN DESCIPTION OUT0,OUT1 IN0, IN1 W0,W1 VCC RST CLK D COUT P0G,P1G P0A,P1A ZCEN MUTE AGND GND - Low-end of resistor High-end of resistor Wiper Terminal 3V or 5V Power Supply Input Serial Port Reset Input Serial Port Clock Input Serial Port Data Input Cascade Data Output Gain Input Pot Controls Attenuation Input Pot Controls Zero-Crossing Detect Input Hardware Mute Control Input Analog Ground Ground 1 of 14 032000 DS1800 DESCRIPTION The DS1800 is a dual audio-taper potentiometer designed specifically for use in the feedback path of the inverting configuration of an operational amplifier (see Figure 2).
In this configuration, the DS1800 provides a VO /VI relationship of -20log(RF/RI), giving a gain/attenuation range covering +20 dB to -63 dB.
Each potentiometer has a total of 129 positions including mute.
The DS1800 provides five areas of resolution, which include: 0.
25 dB per step from +20 dB to +3 dB; 0.
5 dB per step from +3 dB to -12 dB; 1 dB from -12 dB to -27 dB; 2 dB per step from -27 dB to -47 dB; and 4 dB per step from -47 dB to -63 dB.
The mute position provides 100 dB of attenuation.
The DS1800 has two control interfaces (see Figure 1).
The fi...


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