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參數(shù)資料
| 型號： | DAC8248HS |
| 廠商： | PRECISION MONOLITHICS INC |
| 元件分類： | DAC |
| 英文描述： | Dual 12-Bit 8-Bit Byte Double-Buffered CMOS D/A Converter |
| 中文描述： | 12-BIT DAC, PDSO24 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 350K |
| 代理商： | DAC8248HS |
DAC8248
–13–
REV. B
loading the appropriate DAC’s digital inputs with 0000 0000
0000 and adjusting the op amp’s offset voltage to 0 V. It is rec-
ommended that the op amp offset voltage be adjusted to less
than 10% of 1 LSB (244
μ
V), and over the operating tempera-
ture range of interest. T his will ensure the DAC’s monotonicity
and minimize gain and linearity errors.
BIPOLAR OPE RAT ION
T he bipolar (offset binary) 4-quadrant configuration using the
DAC8248 is shown in Figure 8, and the corresponding code is
shown in T able II. T he circuit makes use of the OP470, a quad
op amp (use four OP42s for applications requiring higher
speeds).
T he full-scale output voltage may be adjusted by varying V
REF
or
the value of R5 and R8, and thus eliminating resistors R1, R2,
R3, and R4. If resistors R1 through R4 are omitted, then R5, R6,
R7 (R8, R9, and R10 for DAC B) should be ratio-matched to
0.01% to keep gain error within data sheet specifications. T he re-
sistors should have identical temperature-coefficients if operating
over the full temperature range.
Zero and full-scale are adjusted in one of two ways and are at
the users discretion. Zero-output is adjusted by loading the ap-
propriate DAC’s digital inputs with 1000 0000 0000 and vary-
ing R1 (R3 for DAC B) so that V
OUT A
(or V
OUT B
) equals 0 V.
If R1, R2 (R3, R4 for DAC B) are omitted, then zero output
can be adjusted by varying R6, R7 ratios (R9, R10 for DAC B).
Full-scale is adjusted by loading the appropriate DAC’s digital
inputs with 1111 1111 1111 and varying R5 (R8 for DAC B).
T able II. Bipolar (Offset Binary) Code T able
(Refer to Figure 8)
Binary Number in
DAC Register
MSB
LSB
Analog Output, V
OUT
(DAC A or DAC B)
1111 1111 1111
+V
REF
2047
2048
1000 0000 0001
+V
REF
1
2048
1000 0000 0000
0 V
0111 1111 1111
–V
REF
1
2048
0000 0000 0000
–V
REF
2048
2048
NOT E:
1 LSB=(2
–11
)(V
REF
) =
1
2048
(V
REF
)
SINGLE SUPPLY OPE RAT ION
CURRE NT ST E E RING MODE
Because the DAC8248’s R-2R resistor ladder terminating resis-
tor is internally connected to AGND, it lends itself well for
single supply operation in the current steering mode configura-
tion. T his means that AGND can be raised above system
Figure 8. Bipolar Configuration (4-Quadrant Multiplication)
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