http://www.adlinkchina.com.cn

1
????????

• ??
• ?????????
• http//www.adlinkchina.com.cn
• http//www.adlinktech.com

2
????

• ???????
• ????
• A/D
• D/A
• DIO
• Timer/Counter

3
???????

• ???????

4
??????? (?)

• ?????

5
??????? (?)

• ????

6
??????? (?)

• ????

7
????

• ???
• ????
• ??
• ??
• ????
• ??????????,?????,????

8
PC Based??????
9
PC Base????????

• A/D??(???/?????)
• D/A??(???/?????)
• DIO(?????/??)
• Timer/Counter(???/???)

10
????

• A/D???-?????
• ?????????????????????
• ???? Max Sampling Rate (S/s), Sampling Frequency
  (Hz)
• ??(Resolution)8bit 12bit 14bit 16bit
• ????(Input Range)(??)
• ????(Simultaneous analog input)
• ????(Multiplex analog input)
• ??????(Burst mode)
• ????(Trigger mode)
• ??(Isolation)
• FIFO

11
A/D????
A/D???
12
A/D????--?????
7. ??? ???
4. ???? I/O ?? DMA ????
1. ????? ??? ???? (SE/DI) ????
??????
3. A/D ????? ????? FIFO ???
? ? ? ?
A/D ???
n
?? ???
??(Buffer)
_
AT ??? PCI ??
?? ??
A/D ????
CPU
????
6. A/D ???????? ???? ????????
???????
2. ????? ????? ????
5. ??????
13
A/D?????--????
A/D????
?? ??
?? ???
??(Buffer)
PCI??
?? ??

CPU
?? ??
14
A/D????

• ?????
• ????????????
• ????????????????????
• ?????????
• ??lt4kHz
• ??lt20kHz
• ??20kHzxxMHz
• FM???MHz
• ??xGHz

15
A/D????

• ????
• ???????
• ??????????
• ????????/????????
• Nyquist????fsgt2fmax
• fs ????
• fmax ??????
• ?????fsgt2.5fmax
• ???????fsgt68fmax
• ???????
• ??????

16
A/D????
????????????
???????????
17
A/D????

• ?????????????????????Nyquist??,?????????
• ???????????Nyquist?????,?????Nyquist????????,????(
  alias)
• ????(alias frequency) ABS(??????????-????)
• ????
• ?A/D????????,??????Nyquist?????????
• ????????

18
A/D????

• ???????
• Soft Polling(??????,??I/O????)
• Timer Pacer(?8254????????????????)
• ???? 2MHz ?? /(C1C2)(???C1?C2?16?????????)
• External CLK / Trig(????)
• ???????
• ???????????,???????????,???????????????,???DC??
• ??????????????,??????????????,?????(????????)?????
  ??
• ????????,???????????
• CLK?Trigger

19
A/D????

• Trigger(??)???????????????

20
A/D????

• ????????????(Software Trigger,?Soft Polling)
• ?????????????????
• ????????
• ????????????
• ???????????????
• ?????????

21
A/D????

• ?????
• ????
• ????A/D??,??????????
• ?????????????(????)
• ????
• ?????A/D??,?????????????????
• ??????
• ????????/???????????
• ??????
• ???????????????
• ?????????????????????

22
A/D????

• ????
• ??????,????
• ????
• ????
• ????????,??????
• ????(DI)
• ???????(RSE)
• ????????(NRSE)
• ????,?????????????????????????

???? ????
DI ?? ??
RSE ??? ??
NRSE ?? ??
23
A/D????

• ???????
• ???????NRSE??
• ???RSE??,???????
• ????????????????????????????????
• ????????????????????????????,?????RSE????

24
A/D????

• ???????
• ??????RSE?NRSE????????
• ??????,????????????????????????
• ?????????????????
• 10K ohmltR1R2lt100K ohm
• ??????,???R2??????,?R1?R2????

25
A/D????

• ???????????
• ????
• ?????????
• ?????????????
• NRSE
• ?????????
• RSE
• ???,?????????,???RSE??
• ????????,???gt1V
• ?????,??lt5m
• ??????????????
• ?????????????
• ????????????
• ????,?????????????

26
A/D????
10V

• ???????
• ??????? / ?????????
• ???????
• ??? e.x. -10V 10V (20V??)
• ??? e.x. 0V5V (5V??)
• ?????????
• ?????
• ??????? ????(1,2,4,8)
• ??????? ???(1,10,100,1000)
• ???????? /-10V, ????
• ??????????/-10V, /-5V, /-2.5V, /-1.25V

5V
0V
-10V
27
A/D????

• ????/???Accuracy / Resolution
• ????????????????
• Nbit 8bit / 12bit / 16bit
• ????????/2n
• ????????????
• ????10V??????12??????,??????????10/2120.224mV

??
10.00 8.75 7.50 6.25 5.00 3.75 2.50 1.25 0
111 110 100 011 010 001 000
???

0
20
100
120
140
40
60
80
??
28
A/D????

• A/D????
• ?????
• ??????

?? 2 12 ?, ????? ???????
??1 16 ?, ????? ????????
29
A/D????

• ??
• ?????????
• A/D???????????
• ????
• ?????
• ?????
• ????

????
????
30
A/D????

• FIFO
• ??????? First In First Out
• ??A/D????????
• PCI?????????A/D????,FIFO????????
• ??Bus Mastering DMA,??????DMA 64MB,?????FIFO??

31
A/D????

• ??????????
• ISA???????????IRQ
• ??????

DMA Enable Signal
External Interrupt
EOC Interrupt
Programmable Multiplexer
Timer Interrupt
Jumper
CPU
AT Bus
interrupt lines
FIFO Half-Full Int.
Most of the ISA AD cards only use the EOC
interrupt
DMA Terminal Count
ACL-8316/12?????
32
A/D????

• ??????????
• PCI??????PCI BIOS????IRQ
• ??PCI????????
• ??PCI?????,?????????????
• ???????

AD EOC
INT1
INT1 MUX
PCI Controller
IRQ Flip-Flops
FIFO Half-full
INT2
INT A of PCI Bus
INT2 MUX
Timer Pacer
External IRQ
Clear IRQ
PCI-9111?????
33
A/D????

• ????
• Software Polling
• EOC INT
• FIFO Half Full INT
• DMA
• Bus Mastering DMA
• Scatter Gather DMA

Transfer Data to memory by
A/D Data Register
1. inport instruction 2. DMA controller 3. PCI
Bus-master
FIFO Buffer
ISA Bus or PCI Bus
FIFO Half-Full
FIFO enable
Interrupt Generation System
End of Conversion
interrupt line
34
Scatter/Gather DMA
Fragmented Physical Memory
Gathering Scatter memory
Data FIFO
A/D
PCI Bus Controller
D/A
Retrieves Data
CPU
35
A/D????

• ???????
• Double Buffer DMA

36
A/D??????

• ?????????????????Windows???
• Slave?PCI????DMA,????ISA??DMA??????
• Windows?????????
• ?? FIFO ??????Windows?????, ???????????
• FIFO ??????10 ms???????
• 1024 1 / 100 KHz 10.24 ms
• A/D ??????
• ??FIFO ????????????, ???????????? A/D??
• FIFO ?????????, ????????????????????????????

37
A/D??????

• ?????????
• DMA??,????????????????
• ????,????? EOC?? ??????(?DOS)
• ????????????????

38
D/A????

• D/A????????
• ?????????????????
• ????(Setting Time)?????????,????1/2LSB??????
• ????/???? (Max Data Update Rate)
• ??(Resolution)8bit 12bit 14bit 16bit
• ????
• ??????
• ????
• ????(Source?Sink)

39
A/D?D/A??

• ???A/D????????
• ???100K??????75K???,??????????
• ????DI?RSE?NRSE????????????NRSE???
• ?PCI-9112?/-10V????,??????????
• ??mV???????????????
• ???FIFO??Double Buffer DMA?Buffer?????
• PCI-6208V?D/A?????2??,??????????????500KHz????????
  ?

40
??I/O????

• I/O??????
• ??????
• ???????TTL????
• ????????????
• ??????1??????
• ??????2?????
• ??????
• I/O??

41
??????

• ??????????
• ???????
• ??????????????????

????
1.2K Ohm
PC814
42
??????

• ???????????????????
• ?????????
• ??????,????????

43
DIO????

• ???DI,???DO,????
• 8255??

44
T/C????

• Timer / Counter 82C54
• GATE????????GATE?H???
• CLK??????????????1
• OUT??????????????????????????????

45
T/C????

• ???????
• ??????N
• ?????(T)??????GATE,??????CLK
• ??T??????,???????????

46
T/C????

• ?????????
• ??????N
• ?????(t)?????????CLK,??????GATE
• ??????????,???????????

47
??

• ??????A/D?D/A?GPIO?GPTC?,??????I/O????????