参数资料
型号: DAC8512FP
厂商: Analog Devices Inc
文件页数: 5/20页
文件大小: 0K
描述: IC DAC 12BIT 5V COMPLETE 8-DIP
产品培训模块: Data Converter Fundamentals
DAC Architectures
产品变化通告: Product Discontinuance 27/Oct/2011
标准包装: 50
设置时间: 16µs
位数: 12
数据接口: 串行
转换器数目: 1
电压电源: 单电源
功率耗散(最大): 2.5mW
工作温度: -40°C ~ 85°C
安装类型: 通孔
封装/外壳: 8-DIP(0.300",7.62mm)
供应商设备封装: 8-PDIP
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): 62.5k
DAC8512
–13–
REV. A
Opto-Isolated Interfaces for Process Control Environments
In many process control type applications, it is necessary to pro-
vide an isolation barrier between the controller and the unit be-
ing controlled. Opto-isolators can provide isolation in excess of
3 kV. The serial loading structure of the DAC8512 makes it
ideal for opto-isolated interfaces as the number of interface lines
is kept to a minimum.
Illustrated in Figure 34 is an opto-isolated interface using the
DAC8512. In this circuit, the CS line is always LOW to enable
the DAC, and the 10 k
/1 F combination connected to the
DAC’s CLR pin sets a turn-on time constant of 10 ms to reset
the DAC upon application of power. Three opto-couplers are
then used for the SDI, SCLK, and LD lines.
Often times reducing the number of interface lines to two lines
is required in many control environments. The circuit illustrated
in Figure 35 shows how to convert a two-line interface into the
three control lines required to control the DAC8512 without us-
ing one shots. This technique uses a counter to keep track of the
clock cycles and, when all the data has been input to the DAC,
the external logic generates the LD pulse.
0.1
F
+5V
5
6
8
DAC8512
1
CS
3
4
7
2
0.1
F
10k
+5V
VOUT
+5V
10k
SCLK
10k
SDI
10k
LD
SCLK
SDI
+5V
REG
+5V
POWER
HIGH VOLTAGE
ISOLATION
Figure 34. An Opto-Isolated DAC Interface
+5V
10k
10k
SCLK
SDI
+5V
REG
+5V
POWER
HIGH VOLTAGE
ISOLATION
74HC161
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CLR
CLK
A
B
C
D
ENP
GND
V
CC
RCO
Q
A
Q
B
Q
C
Q
D
ENT
LOAD
+5V
10k
NC
0.1
F
+5V
10k
X
1
2
3
Y
4
5
6
1/4 74HCOO
V
DD
0.1
F
3
5
8
DAC8512
1
+5V
4
LD
SCLK
SDI
7
6
CLR
GND
V
OUT
CS
2
+5V
10k
1
F
Figure 35. A Two-Wire, Opto-lsolated DAC Interface
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