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參數資料
| 型號： | AD7641ACPRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | ECONOLINE: REC2.2-S_DRW(Z)/H* - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- 4.5-9V, 9-18V, 18-36V, 36-72V Wide Input Range 2 : 1- UL94V-0 Package Material- Continuous Short Circiut Protection- Cost Effective- 100% Burned In- Efficiency to 84% |
| 中文描述： | 1-CH 18-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, QCC48 |
| 封裝： | MO-220-VKKD, LFCSP-48 |
| 文件頁數： | 21/24頁 |
| 文件大小： | 324K |
| 代理商： | AD7641ACPRL |
Preliminary Technical Data
AD7641
MICROPROCESSOR INTERFACING
The AD7641 is ideally suited for traditional dc measurement
applications supporting a microprocessor, and ac signal
processing applications interfacing to a digital signal processor.
The AD7641 is designed to interface either with a parallel 8-bit
or 16-bit wide interface or with a general purpose serial port or
I/O ports on a microcontroller. A variety of external buffers can
be used with the AD7641 to prevent digital noise from coupling
into the ADC. The following section illustrates the use of the
AD7641 with an SPI equipped DSP, the ADSP-219x.
SPI Interface (ADSP-219x)
Figure 22 shows an interface diagram between the AD7641 and
an SPI-equipped DSP, ADSP219x. To accommodate the slower
speed of the DSP, the AD7641 acts as a slave device and data
must be read after conversion. This mode also allows the “daisy
chain” feature. The convert command could be initiated in
response to an internal timer interrupt. The 18-bit output data
are read with 3 SPI byte access. The reading process could be
initiated in response to the end-of-conversion signal (BUSY
going low) using an interrupt line of the DSP. The Serial
Rev. Pr E | Page 21 of 24
Peripheral Interface (SPI) on the ADSP-219x is configured for
master mode (MSTR) = 1, Clock Polarity Bit (CPOL) = 0, Clock
Phase Bit (CPHA) = 1 and SPI interrupt enable (TIMOD) =00
by writing to the SPI Control Register (SPICLTx). It should be
noted that to meet all timing requirements, the SPI clock should
be limited to 17Mbits/s which allow to read an ADC result in
about 1.1 μs. When higher sampling rate is desired, it is
recommended to use one of the parallel interface mode with the
ADSP-219x.
SPIxSEL (PFx)
ADSP-219x*
CNVST
AD7641*
CS
MISOx
SCKx
PFx or TFSx
SDOUT
SCLK
INVSCLK
EXT/INT
DVDD
*ADDITIONAL PINS OMITTED FOR CLARITY
SER/PAR
RD
PFx
BUSY
Figure 24. Interfacing the AD7641 to SPI Interface
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