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Digital pot Li'lBoard page.
Model number: LB5.09.
Description: 2, 10 kΩ digital pots. SPI controlled.
Applications: Stereo volume control, digitally adjustable regulator (in conjunction with a L'il2.01 or L'il2.02), digitally controlled pulse width and/or spacing in a L'il3.1, Op Amp gain control, etc, etc.
Features: The two digital pot ICs can be connected to the SPI lines in series or parallel.
Key components: AD5290 (can be 10 k, 50 k or 100k).
Restrictions: Watch the rating of the decoupling capacitors with respect to the supplies. First board was made with only 10 V parts.
Images:
Click on image for full (PDF) schematic
Vin max: Vdd can be as high as 30 V higher than Vss. Vss can be tied to GND. Signal pins have to be within the Vss to Vdd range at all times.
Vin min: Vdd has to be at least +4.5 V with respect to GND. Vss can be negative, down to -15 V.
SPI: Yes.
Tenth centers: YES