The last page of this DAC datasheet gives dimensions of the chip:
Some of these dimensions come is 3-tuples (such as the pin width: 0.30 | 0.37 | 0.45). What does each of the numbers mean? Is it min, mean and max?
Electronic – Multiple lengths in DAC datasheet
dacdatasheetmechanical
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You have two levels of DAC decoding the two most significant groups of 4 bits; for each the output is built summing the current from the sources according to the binary decoded value of the 4 bits:
15 sources, because the value
0000means that no source is giving current;Considering the output, 10.... is equal to 01.... but the fact is that you have the current sources active depending upon the input bits (see no. 1): if you have
0100, you'll have 4 current sources active;binary weighted DAC is an architecture in which you use resistors with power of 2 values (you can use also switched capacitors or others); you have an op-amp where a reference voltage is feeded through these binary weighted resistors, that are switched accordingly to the input code.
BSC means "Basic Spacing Between Centers". This is often used if the reference lines don't refer to a physical point or edge, like in the case of the pins: the reference is in the middle of the pin, instead of one of the edges.
BSC SQ = BSC square, i.e. in both X and Y dimensions.
The abbreviation BSC is misused in the case of the package outline, and overall dimensions, as they are specified by physical edges which can be measured.
Usually a mechanical drawing of a package will show minimum and maximum values. BSC SQ must be regarded as nominal, so may deviate, but it doesn't say by how much.
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Best Answer
The second is nominal, not mean. But yes, height is 0.95 mm minimum, 1.00 mm nominal, and 1.05 mm maximum.
The difference between mean and nominal is that nominal is the target dimension, that's the aim. Mean usually means arithmetic mean, but that may deviate from nominal, depending on spread.
This could be a statistic on the package thickness. Apparently the injection mold wasn't made precise enough, so that the mean thickness is 1.01 mm (purple line). But the nominal thickness is still 1.00, with 0.95 mm and 1.05 mm as limits. So even with a mean deviating from nominal that condition is met.