參數(shù)資料
型號: AD7538JNZ
廠商: Analog Devices Inc
文件頁數(shù): 6/16頁
文件大?。?/td> 0K
描述: IC DAC 14BIT W/BUFFER 24DIP
產(chǎn)品培訓(xùn)模塊: Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝: 15
設(shè)置時間: 1.5µs
位數(shù): 14
數(shù)據(jù)接口: 并聯(lián)
轉(zhuǎn)換器數(shù)目: 1
電壓電源: 單電源
功率耗散(最大): 1W
工作溫度: 0°C ~ 70°C
安裝類型: 通孔
封裝/外殼: 24-DIP(0.300",7.62mm)
供應(yīng)商設(shè)備封裝: 24-PDIP
包裝: 管件
輸出數(shù)目和類型: 1 電流,單極;1 電流,雙極
采樣率(每秒): 667k
AD7538
Rev. B | Page 14 of 16
DIGITAL FEEDTHROUGH
The digital inputs to the AD7538 are directly connected to the
microprocessor bus in the preceding interface configurations.
These inputs are constantly changing even when the device is
not selected. 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 13 shows an
interface circuit, which uses this technique. All data inputs are
latched from the bus by the CS signal. One may also use other
means, such as peripheral interface devices, to reduce the digital
feedthrough.
D0 TO D15
WR
A0 TO A15
CS
LDAC
WR
DB0 TO DB13
MICRO-
PROCESSOR
SYSTEM
AD75381
1LINEAR CIRCUITRY OMITTED FOR CLARITY.
0
1
13
9-
01
3
ADDRESS
DECODE
16-BIT
LATCH
EN
Figure 13. AD7538 Interface Circuit Using Latches to Minimize Digital
Feedthrough
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