參數(shù)資料
型號(hào)： AD7845KRZ-REEL
廠商： Analog Devices Inc
文件頁數(shù)： 2/12頁
文件大小： 0K
描述： IC DAC 12BIT MULT LC2MOS 24-SOIC
產(chǎn)品培訓(xùn)模塊： Data Converter Fundamentals
DAC Architectures
標(biāo)準(zhǔn)包裝： 1,000
設(shè)置時(shí)間： 5µs
位數(shù)： 12
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
電壓電源： 雙 ±
功率耗散（最大）： 150mW
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 24-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 24-SOIC W
包裝： 帶卷 (TR)
輸出數(shù)目和類型： 1 電壓，單極；1 電壓，雙極
采樣率（每秒）： 200k
AD7845
REV. B
–10–
8-BIT MICROPROCESSOR SYSTEMS
Figure 22 shows an interface circuit for the AD7845 to the
8085A 8-bit microprocessor. The software routine to load data
to the device is given in Table IV. Note that the transfer of the
12 bits of data requires two write operations. The first of these
loads the 4 MSBs into the 7475 latch. The second write opera-
tion loads the 8 LSBs plus the 4 MSBs (which are held by the
latch) into the DAC.
Figure 22. 8085A Interface
Table IV. Subroutine Listing for Figure 22
2000 LOAD DAC: LXI
H,#3000
The H,L register pair
are loaded with latch
address 3000.
MVI
A,#“MS”
Load the 4 MSBs of
data into accumulator.
MOV
M,A
Transfer data from
accumulator to latch.
INR
L
Increment H,L pair to
AD7845 address.
MVI
A,#“LS”
Load the 8 LSBs of
data into accumulator.
MOV
M,A
Transfer data from
accumulator to DAC.
RET
End of routine.
MICROPROCESSOR INTERFACING
16-BIT MICROPROCESSOR SYSTEMS
Figures 19, 20 and 21 show how the AD7845 interfaces to
three popular 16-bit microprocessor systems. These are the
MC68000, 8086 and the TM32010. The AD7845 is treated as
a memory-mapped peripheral to the processors. In each case, a
write instruction loads the AD7845 with the appropriate data.
The particular instructions used are as follows:
MC68000:
MOVE
8086:
MOV
TMS32010: OUT
Figure 19. AD7845 to MC68000 Interface
Figure 20. AD7845 to 8086 Interface
Figure 21. TMS32010
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