参数资料
型号: EVAL-AD7651CBZ
厂商: Analog Devices Inc
文件页数: 17/28页
文件大小: 0K
描述: BOARD EVALUATION FOR AD7651
标准包装: 1
系列: PulSAR®
ADC 的数量: 1
位数: 16
采样率(每秒): 100k
数据接口: 串行,并联
输入范围: 0 ~ 2.5 V
在以下条件下的电源(标准): 16mW @ 100kSPS
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD7651
已供物品:
相关产品: AD7651ASTZ-ND - IC ADC 16BIT 100KSPS 48-LQFP
AD7651ACPZ-ND - IC ADC 16BIT UNIPOLAR 48LFCSP
AD7651ASTZRL-ND - IC ADC 16BIT UNIPOLAR 48LFCSP
AD7651ACPZRL-ND - IC ADC 16BIT UNIPOLAR 48LQFP
AD7651
MICROPROCESSOR INTERFACING
The AD7651 is ideally suited for traditional dc measurement
applications supporting a microprocessor, and for ac signal
processing applications interfacing to a digital signal processor.
The AD7651 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 AD7651 to prevent digital noise from coupling
into the ADC. The following section discusses the use of an
AD7651 with an ADSP-219x SPI equipped DSP.
SPI Interface (ADSP-219x)
Figure 37. Interfacing the AD7651 to an SPI Interfac
shows an interface diagram between the AD7651 and
the SPI equipped ADSP-219x. To accommodate the slower
speed of the DSP, the AD7651 acts as a slave device and data
must be read after conversion. This mode also allows the daisy-
chain feature. The convert command can be initiated in
response to an internal timer interrupt. The reading process can
be initiated in response to the end-of-conversion signal (BUSY
going LOW) using an interrupt line of the DSP. The serial inter-
face (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). To meet all timing
requirements, the SPI clock should be limited to 17 Mbps, which
allows it to read an ADC result in less than 1 s. When a higher
sampling rate is desired, use of one of the parallel interface
modes is recommended.
AD7651*
ADSP-219x*
SER/PAR
PFx
MISOx
SCKx
PFx or TFSx
BUSY
SDOUT
SCLK
CNVST
EXT/INT
CS
RD
INVSCLK
DVDD
* ADDITIONAL PINS OMITTED FOR CLARITY
SPIxSEL (PFx)
02964-0-021
Rev. 0 | Page 24 of 28
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