DS1800 Dallas Semiconducotr, DS1800 Datasheet
DS1800
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DS1800 Summary of contents
Page 1
... Serial Port Data Input C - Cascade Data Output OUT P0G,P1G - Gain Input Pot Controls P0A,P1A - Attenuation Input Pot Controls - Zero-Crossing Detect Input ZCEN MUTE - Hardware Mute Control Input AGND - Analog Ground GND - Ground DS1800 P1G 18 P1A 17 P0G 16 P0A 15 MUTE 14 AGND 13 ...
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... Positions 123 to 127 provide 4 dB per step and cover a gain/attenuation range of - dB. Position 128 is the mute position and typically provides 100 dB of attenuation. PIN DESCRIPTIONS The DS1800 has a total of 20 pins which provide various functions for the device. This section provides a description of each pin’s operation Power Supply Voltage Input ...
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... Interface Control.” The state of this pin is determined only at device power-up. POWER-UP CONDITIONS The position of the wipers of the DS1800 on power-up are internally set to position 127, which is the last position before mute. The user then has the responsibility of changing the wiper position to the desired attenuation/ gain levels ...
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... SERIAL INTERFACE CONTROL CPU control of the DS1800 is accomplished using the 3-wire serial port of the device. This interface drives an internal control logic unit. Direct wiper positioning is accomplished by using this port which consist of three input signals: The control signal is used to enable 3-wire serial port write operations. The CLK terminal is an input RST that provides synchronization for data I/O ...
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... PxA or PxG input terminals will cause the wiper to move one position. A transition from high to low on these inputs is considered the beginning of pulse activity or contact closure. The DS1800 has two timing modes for controlling the speed at which pushbuttons will operate. These modes are termed fast mode operation and slow mode operation ...
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... CASCADE OPERATION A feature of the DS1800 is the ability to control multiple devices from a single processor. Multiple DS1800’s can be linked or daisy-chained as shown in Figure data bit is entered into the I/O shift register of the DS1800, a data bit will appear at the C nanoseconds. ...
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... L,H,W GND-0 SYMBOL MIN TYP 400 STBY DS1800 (- +85 C) MAX UNITS NOTES 5 +0.5 V 1,2 CC +0.8 V 1,2 GND+0 GND+0 =2.7V to 5.5V) CC MAX UNITS NOTES 2000 µ µA ...
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... TYP 53 -20 -0.5 -1.0 -0.5 -0.25 -0.5 f CUTOFF 750 THD 0.002 2.2 -90 -100 MUTE -100 (- + SYMBOL MIN TYP OUT =2.7V to 5.5V) CC MAX UNITS K +20 % +0.5 dB +1.0 dB +0.5 dB +0. +0.5 1 MHz ppm µVrms =2.7V to 5.5V) CC MAX UNITS DS1800 NOTES NOTES ...
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... Inter–Channel Matching is used to determine the relative voltage difference in dB between the same position on each potentiometer. The DS1800 is specified for ±0.25 dB inter-channel matching from position 0 to position 112 (+ –27 dB) and ±0.5 dB from position 113 to position 127 ...
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... Tap–to–Tap tolerance is used to determine the change in voltage between successive tap positions. The DS1800 is specified for ±0.5 dB tap–to–tap tolerance. From position 0 to position 112 (+ –27 dB). From position 113 to position 127, the DS1800 is specified for ±1 dB tap–to–tap tolerance. ...
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... RECOMMENDED CIRCUIT CONFIGURATION Figure GAIN/ATTENUATION VS. POSITION RELATIONSHIP Figure DS1800 ...
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... R /R RELATIONSHIP VS. POSITION Figure 3–WIRE SERIAL TIMING DIAGRAM Figure DS1800 ...
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... I/O SHIFT REGISTER Figure 6 CONTACT CLOSURE TIMING DIAGRAMS Figure 7 CASCADING OPERATION Figure DS1800 ...
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... DIGITAL OUTPUT LOAD Figure 9 INTERNAL GROUND CONNECTIONS Figure 10 NOTE: GND and AGND must be tied to the same voltage level DS1800 ...