参数资料
型号: AD7845ARZ
厂商: Analog Devices Inc
文件页数: 3/12页
文件大小: 0K
描述: IC DAC 12BIT MULT LC2MOS 24SOIC
产品培训模块: Data Converter Fundamentals
DAC Architectures
标准包装: 31
设置时间: 5µs
位数: 12
数据接口: 并联
转换器数目: 1
电压电源: 双 ±
功率耗散(最大): 150mW
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 24-SOIC(0.295",7.50mm 宽)
供应商设备封装: 24-SOIC W
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): 200k
AD7845
REV. B
–11–
Figure 23 and 24 are the interface circuits for the Z80 and
MC6809 microprocessors. Again, these use the same basic
format as the 8085A interface.
Figure 23. AD7845 to Z80 Interface
Figure 24. MC6809 Interface
DIGITAL FEEDTHROUGH
In the preceding interface configurations, most digital inputs to
the AD7845 are directly connected to the microprocessor bus.
Even when the device is not selected, these inputs will be con-
stantly changing. The high frequency logic activity on the bus
can feed through the DAC package capacitance to show up as
noise on the analog output. To minimize this digital feedthrough
isolate the DAC from the noise source. Figure 25 shows an
interface circuit which uses this technique. All data inputs are
latched from the busy by the
CS signal. One may also use other
means, such as peripheral interface devices, to reduce the digital
feedthrough.
Figure 25. AD7845 Interface Circuit Using Latches to
Minimize Digital Feedthrough
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