REB
Micah Stevens wrote:
Why? This isn't a divider circuit. I think I see what you're getting at, but I'm not sure I'm buying it. -Micah On Monday 09 January 2006 1:57 pm, Jim Wagner wrote:Sorry, but wrong about the tolerance! Each successive leg has half the tolerance contribution of the leg just above it in the ladder. With 1% resistors, the over-all tolerance will be in the 3-4% range. What may be more critical is monotonicity, especially the step going from 0x7f to 0x80 (in an 8-bit) DAC. An R-2R DAC also relies on the on-resistance of the FETs in the logic output circuit. Jim