The DS1667 contains two integrated circuit potentiometers, which can be adjusted by selecting resistor elements by counting. Each potentiometer consists of 256 resistor elements, and each resistor segment has a tap that can be connected to the cursor. The position of the cursor in the resistor array is set by an 8-bit register, which controls which tap the output of the cursor is connected to. Each 8-bit register sends or receives data bits through a 3-wire serial port for read/write operations. In addition, two potentiometers can be connected in series to form a single potentiometer with 512 resistor segments. When the two potentiometers are used separately, the resolution of the DS1667 is equal to the resistance value of the resistor divided by 256. When the potentiometers are connected in series, the resistance value of the resistor is twice the original, but the resolution remains unchanged. The DS1667 contains two high-gain broadband operational amplifiers, each of which has a non-inverting and inverting input terminal and an output terminal for user design and use. The operational amplifier and the potentiometer work together to complete certain functions, such as analog/digital conversion, digital/analog conversion, variable gain amplifier, variable frequency oscillator, etc. Figure 1 DS1667 pinout
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