参数资料
型号: AD7651ACPZ
厂商: Analog Devices Inc
文件页数: 17/28页
文件大小: 0K
描述: IC ADC 16BIT UNIPOLAR 48LFCSP
标准包装: 1
系列: PulSAR®
位数: 16
采样率(每秒): 100k
数据接口: 串行,并联
转换器数目: 1
功率耗散(最大): 45mW
电压电源: 模拟和数字
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 48-VFQFN 裸露焊盘,CSP
供应商设备封装: 48-LFCSP-VQ(7x7)
包装: 托盘
输入数目和类型: 2 个伪差分,单极
配用: EVAL-AD7651CBZ-ND - BOARD EVALUATION FOR AD7651
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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