参数资料
型号: AD7846AP
厂商: Analog Devices Inc
文件页数: 5/24页
文件大小: 0K
描述: IC DAC 16BIT LC2MOS VOUT 28PLCC
产品培训模块: Data Converter Fundamentals
DAC Architectures
标准包装: 1
设置时间: 7µs
位数: 16
数据接口: 并联
转换器数目: 1
电压电源: 双 ±
功率耗散(最大): 100mW
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 28-LCC(J 形引线)
供应商设备封装: 28-PLCC(11.51x11.51)
包装: 管件
输出数目和类型: 1 电压,单极;1 电压,双极
采样率(每秒): 143k
AD7846
Rev. G | Page 13 of 24
UNIPOLAR BINARY OPERATION
Figure 23 shows the AD7846 in the unipolar binary circuit
configuration. The DAC is driven by the AD586 +5 V reference.
Because RIN is tied to 0 V, the output amplifier has a gain of 2
and the output range is 0 V to +10 V. If a 0 V to +5 V range is
required, RIN should be tied to VOUT, configuring the output
stage for a gain of 1. Table 8 gives the code table for the circuit
RIN
VOUT
DGND
+15V
+5V
VCC
VDD
VREF+
VREF–
R1
10k
C1
1F
SIGNAL
GROUND
–15V
*ADDITIONAL PINS
OMITTED FOR CLARITY
AD7846*
AD586
VOUT
(0V TO +10V)
VSS
2
5
4
67
21
5
20
6
4
8
08490
-0
23
Figure 23. Unipolar Binary Operation
Table 8. Code Table for Figure 23
Binary Number in DAC Latch
MSB
LSB1
Analog Output (VOUT)
1111 1111 1111 1111
+10 (65,535/65,536) V
1000 0000 0000 0000
+10 (32,768/65,536) V
0000 0000 0000 0001
+10 (1/65,536) V
0000 0000 0000 0000
0 V
1 LSB = 10 V/216 = 10 V/65,536 = 152 μV.
Offset and gain can be adjusted in Figure 23 as follows:
To adjust offset, disconnect the VREF input from 0 V, load
the DAC with all 0s, and adjust the VREF voltage until VOUT
= 0 V.
For gain adjustment, the AD7846 should be loaded with all
1s and R1 adjusted until VOUT = 10 (65,535)/(65,536) =
9.999847 V. If a simple resistor divider is used to vary the
VREF voltage, it is important that the temperature
coefficients of these resistors match that of the DAC input
resistance (300 ppm/°C). Otherwise, extra offset errors are
introduced over temperature. Many circuits do not require
these offset and gain adjustments. In these circuits, R1 can
be omitted. Pin 5 of the AD586 can be left open circuit and
Pin 8 (VREF) of the AD7846 tied to 0 V.
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