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參數資料
| 型號： | AD7863ARS-3 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | Simultaneous Sampling Dual 175 kSPS 14-Bit ADC |
| 中文描述： | 4-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | MO-150AH, SSOP-28 |
| 文件頁數： | 14/18頁 |
| 文件大小： | 207K |
| 代理商： | AD7863ARS-3 |
AD7863
–
14
–
REV. A
MICROPROCESSOR INTERFACING
The AD7863 high speed bus timing allows direct interfacing to
DSP processors as well as modern 16-bit microprocessors.
Suitable microprocessor interfaces are shown in Figures 14
through 18.
AD7863–ADSP-2100 Interface
Figure 14 shows an interface between the AD7863 and the
ADSP-2100. The
CONVST
signal can be supplied from the
ADSP-2100 or from an external source. The AD7863 BUSY
line provides an interrupt to the ADSP-2100 when conversion is
completed on both channels. The two conversion results can
then be read from the AD7863 using two successive reads to the
same memory address. The following instruction reads one of
the two results:
MR
0 =
DM
(
ADC
)
where
MR
0 is the ADSP-2100
MR
0 register and
ADC
is the
AD7863 address.
ADDR
DECODE
EN
ADDRESS BUS
DMA13
DMA0
DMS
IRQn
DMRD (RD)
DMD15
DMD0
CS
A0
BUSY
RD
DB13
DB0
DATA BUS
ADSP-2100
(ADSP-2101/
ADSP-2102)
AD7863*
*ADDITIONAL PINS OMITTED FOR CLARITY
OPTIONAL
CONVST
Figure 14. AD7863
–
ADSP-2100 Interface
AD7863–ADSP-2101/ADSP-2102 Interface
The interface outlined in Figure 14 also forms the basis for an
interface between the AD7863 and the ADSP-2101/ADSP-2102.
The READ line of the ADSP-2101/ADSP-2102 is labeled
RD
.
In this interface, the
RD
pulsewidth of the processor can be
programmed using the Data Memory Wait State Control Regis-
ter. The instruction used to read one of the two results is as
outlined for the ADSP-2100.
AD7863–TMS32010 Interface
An interface between the AD7863 and the TMS32010 is
shown in Figure 15. Once again the
CONVST
signal can be
supplied from the TMS32010 or from an external source,
and the TMS32010 is interrupted when both conversions have
been completed. The following instruction is used to read the
conversion results from the AD7863:
IN D
,
ADC
where
D
is Data Memory address and
ADC
is the AD7863
address.
ADDR
DECODE
EN
ADDRESS BUS
PA2
PA0
MEN
INT
DEN
D15
D0
CS
A0
BUSY
RD
DB13
DB0
DATA BUS
TMS32010
AD7863*
*ADDITIONAL PINS OMITTED FOR CLARITY
OPTIONAL
CONVST
Figure 15. AD7863
–
TMS32010 Interface
AD7863–TMS320C25 Interface
Figure 16 shows an interface between the AD7863 and the
TMS320C25. As with the two previous interfaces, conversion
can be initiated from the TMS320C25 or from an external
source, and the processor is interrupted when the conversion
sequence is completed. The TMS320C25 does not have a sepa-
rate
RD
output to drive the AD7863
RD
input directly. This
has to be generated from the processor STRB and R/
W
outputs
with the addition of some logic gates. The
RD
signal is OR-
gated with the
MSC
signal to provide the one WAIT state re-
quired in the read cycle for correct interface timing. Conversion
results are read from the AD7863 using the following instruction:
IN D
,
ADC
where
D
is Data Memory address and
ADC
is the AD7863
address.
ADDR
DECODE
EN
ADDRESS BUS
A15
A0
IS
INTn
STRB
DMD15
DMD0
CS
A0
BUSY
RD
DB13
DB0
DATA BUS
TMS320C25
AD7863*
*ADDITIONAL PINS OMITTED FOR CLARITY
OPTIONAL
CONVST
R/
W
READY
MSC
Figure 16. AD7863
–
TMS320C25 Interface
Some applications may require that the conversion is initiated
by the microprocessor rather than an external timer. One option
is to decode the AD7863
CONVST
from the address bus so
that a write operation starts a conversion. Data is read at the
end of the conversion sequence as before. Figure 18 shows an
example of initiating conversion using this method. Note that
for all interfaces, it is preferred that a read operation not be
attempted during conversion.
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