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DS1800 Datasheet(PDF) 2 Page - Dallas Semiconductor |
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DS1800 Datasheet(HTML) 2 Page - Dallas Semiconductor |
2 / 14 page DS1800 2 of 14 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 first is a 3-wire serial CPU interface consisting of RST , CLK, and D. The second interface is a contact-closure interface, allowing easy push- button control without the need for external debounce or timing circuitry. The device also provides for software muting (via CPU) or hardware muting (MUTE control input). The hardware mute is a toggle type which returns the wiper positions to their prior states. Additional information on CPU and push- button control is described under the section entitled “OPERATION.” The DS1800 is available in 20-pin DIPs, SOICs, and TSSOPs. One standard resistance grade of 53 k Ω=is available for the device. OPERATION The DS1800 provides two 129-position 45 k Ω potentiometers. These potentiometers are specifically designed to operate in the configuration shown in Figure 2. Under this configuration the V0/VI relationship provides the gain/attenuation function of -20log(RF/RI) over a range of +20 dB to -63 dB. This function is illustrated in Figure 3 as a graph of gain/attenuation versus position. Figure 4 provides the relationship between RF and RI as a function of position. The DS1800 has a total of 129 positions including a mute position. Five areas of resolution are provided over the gain/attenuation range and are illustrated in Figure 3. From position 0 to position 68, a resolution of 0.25 dB per step is attained covering a gain/attenuation range of +20 dB to +3 dB. From position 68 to position 98, 0.5 dB per step of resolution is attained covering +3 dB to -12 dB of gain/attenuation. Positions 98 to 113 have 1 dB per step resolution and cover a gain/attenuation range of -12 to -27 dB. Positions 113 to 123 provide 2 dB per step and cover a gain/attenuation range of -27 dB to -47 dB. Positions 123 to 127 provide 4 dB per step and cover a gain/attenuation range of -47 dB to 63 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. VCC - Power Supply Voltage Input. The DS1800 will support 3V or 5V power supply operation. GND - Ground. The DS1800 has two ground pins. The GND supports the digital ground for the device. AGND - Analog Ground. The DS1800 has two ground pins. The AGND supports analog ground for the device. IN0, IN1 - Input terminals for the two respective potentiometers as shown in Figure 2. These terminals should be connected to the analog signal, VI, to provide the gain/attenuation characteristics stated. These terminals are referenced as INx in the Figure 2 drawing. |
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