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參數(shù)資料
| 型號： | DAC312HS |
| 廠商： | PRECISION MONOLITHICS INC |
| 元件分類： | DAC |
| 英文描述： | 12-Bit High Speed Multiplying D/A Converter |
| 中文描述： | PARALLEL, WORD INPUT LOADING, 0.25 us SETTLING TIME, 12-BIT DAC, PDSO20 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 269K |
| 代理商： | DAC312HS |
DAC312
–12–
REV. C
One of the characteristics of an R-2R DAC in standard form is
that any transition which causes a zero LSB change (i.e., the
same output for two different codes) will exhibit the same out-
put each time that transition occurs. T he same holds true for
transitions causing a 2 LSB change. T hese two problem transi-
tions are allowable for the standard definition of monotonicity
and also allow the device to be specified very tightly for INL.
T he major problem arising from this error type is in A/D con-
verter implementations. Inputs producing the same output are
now represented by ambiguous output codes for an identical in-
put. Also, 2 LSB gaps can cause large errors at those input lev-
els (assuming 1/2 LSB quantizing levels). It can be seen from
the two figures that the DNL specified D/A converter will yield
much finer grained data than the INL specified part, thus im-
proving the ability of the A/D to resolve changes in the analog
input.
DIFFE RE NT IAL LINE ARIT Y COMPARISON
D/A Converter with
±
1/2 LSB INL,
±
1 LSB DNL
Video Deflection by DACs
ENLARGED “ POSITIONAL” OUTPUTS
D/A Converter with
±
2 LSB INL,
±
1/2 LSB DNL
Video Deflection by DACs
ENLARGED “ POSITIONAL” OUTPUTS
DIFFE RE NT IAL VS. INT E GRAL NONLINE ARIT Y
Integral nonlinearity, for the purposes of the discussion, refers
to the “straightness”of the line drawn through the individual re-
sponse points of a data converter. Differential nonlinearity, on
the other hand, refers to the deviation of the spacing of the adja-
cent points from a 1 LSB ideal spacing. Both may be expressed
as either a percentage of full-scale output or as fractional LSBs
or both. T he following figures define the manner in which these
parameters are specified. T he left figure shows a portion of the
transfer curve of a DAC with 1/2 LSB INL and the (implied)
DNL spec of 1 LSB. Below this is a graphic representation of
the way this would appear on a CRT , for example, if the D/A
converter output were to be applied to the Y input of a CRT as
shown in the application schematic titled “CRT Display Drive.”
On the right is a portion of the transfer curve of a DAC speci-
fied for 2 LSB INL with 1/2 LSB DNL specified and the
graphic display below it.
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