参数资料
型号: DAC8248FP
厂商: Analog Devices Inc
文件页数: 5/16页
文件大小: 0K
描述: IC DAC 12BIT DUAL BUFFERD 24-DIP
产品培训模块: Data Converter Fundamentals
DAC Architectures
标准包装: 15
设置时间: 1µs
位数: 12
数据接口: 并联
转换器数目: 2
电压电源: 单电源
功率耗散(最大): 50µW
工作温度: -40°C ~ 85°C
安装类型: 通孔
封装/外壳: 24-DIP(0.300",7.62mm)
供应商设备封装: 24-PDIP
包装: 管件
输出数目和类型: 2 电流,单极;2 电流,双极
采样率(每秒): 1M
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
V), and over the operating tempera-
ture range of interest. This will ensure the DAC’s monotonicity
and minimize gain and linearity errors.
BIPOLAR OPERATION
The bipolar (offset binary) 4-quadrant configuration using the
DAC8248 is shown in Figure 8, and the corresponding code is
shown in Table II. The circuit makes use of the OP470, a quad
op amp (use four OP42s for applications requiring higher
speeds).
The full-scale output voltage may be adjusted by varying VREF 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. The 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 VOUT A (or VOUT 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).
Table II. Bipolar (Offset Binary) Code Table
(Refer to Figure 8)
Binary Number in
DAC Register
Analog Output, VOUT
MSB
LSB
(DAC A or DAC B)
1111 1111 1111
+VREF
2047
2048
1000 0000 0001
+VREF
1
2048
1000 0000 0000
0 V
0111 1111 1111
–VREF
1
2048
0000 0000 0000
–VREF
2048
NOTE:
1 LSB=(2
–11)(V
REF) =
1
2048
(VREF)
SINGLE SUPPLY OPERATION
CURRENT STEERING 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. This means that AGND can be raised above system
Figure 8. Bipolar Configuration (4-Quadrant Multiplication)
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