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Maxim > Design Support > Technical Documents > Application Notes > Digital Potentiometers > APP 4075
Maxim > Design Support > Technical Documents > Application Notes > Optoelectronics > APP 4075
Keywords: DS1864, current DAC, voltage DAC, current to voltage
APPLICATION NOTE 4075
How to Use the DS1864's Current DACs as
Voltage DACs
Jul 20, 2007
Abstract: This article describes how to convert the current DACs in the DS1864 SFP laser
controller/monitor to a voltage output by using standard components.
The Current DACs
The DS1864 contains two 8-bit current-sink DACs with 1.5mA or 0.5mA selectable full-scale range. The
DAC outputs must be at a voltage level between 0.7V and the DS1864's V
CC
.
Current-to-Voltage Conversion
An operational amplifier in differential amplifier configuration is used to convert the 0.5mA full-scale
current-mode output to 1V full-scale voltage-mode output (Figure 1).
Figure 1. Circuit shows current-to-voltage conversion.
Compact Solution
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