DS1867

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102199

POWER-DOWN EEPROM TIMING REQUIREMENTS Figure 6

TYPICAL APPLICATION CONFIGURATIONS

Figures 7 and 8 show two typical application configurations for the DS1867. By connecting the wiper

terminal of the part to a high impedance load, the effects of the wiper resistance is minimized, since the

wiper resistance can vary from 400 to 1000 ohms depending on wiper voltage. Figure 7 presents the

device connected in an inverting variable gain amplifier. The gain of the circuit on Figure 7 is given by

the following equation:

Av = -n/(255-n); where n = 0 to 255

Figure 8 shows the device operating in a fixed gain attenuator where the potentiometer is used to

attenuate an incoming signal. Note the resistance R1 is chosen to be much greater than the wiper

resistance to minimize its effect on circuit gain.

INVERTING VARIABLE GAIN AMPLIFIER Figure 7

DS1867