参数资料
型号: EVAL-AD7654CBZ
厂商: Analog Devices Inc
文件页数: 17/28页
文件大小: 0K
描述: BOARD EVALUATION FOR AD7654
标准包装: 1
系列: PulSAR®
ADC 的数量: 2
位数: 16
采样率(每秒): 500k
数据接口: 串行,并联
输入范围: 0 ~ 5 V
在以下条件下的电源(标准): 120mW @ 500kSPS
工作温度: -40°C ~ 85°C
已用 IC / 零件: AD7654
已供物品:
相关产品: AD7654ACPZ-ND - IC ADC 16BIT DUAL 2CH 48-LFCSP
AD7654ASTZRL-ND - IC ADC 16BIT DUAL 2CH 48LQFP
AD7654ACPZRL-ND - IC ADC 16BIT DUAL 2CH 48LFCSP
AD7654ASTZ-ND - IC ADC 16BIT 500KSPS DUAL 48LQFP
AD7654
Rev. B | Page 24 of 28
MICROPROCESSOR INTERFACING
The AD7654 is ideally suited for traditional dc measurement
applications supporting a microprocessor and for ac signal
processing applications interfacing to a digital signal processor.
The AD7654 is designed to interface with either a parallel 8-bit
wide or 16-bit wide interface, a general-purpose serial port, or
I/O ports on a microcontroller. A variety of external buffers can
be used with the AD7654 to prevent digital noise from coupling
into the ADC. The following section illustrates the use of the
AD7654 with an SPI-equipped DSP, the ADSP-219x.
SPI INTERFACE (ADSP-219X)
Figure 34 shows an interface diagram between the AD7654 and
the SPI equipped ADSP-219x. To accommodate the slower
speed of the DSP, the AD7654 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 32-bit output data
is read with two serial peripheral interface (SPI) 16-bit wide
accesses. The reading process can be initiated in response to the
end-of-conversion signal (BUSY going low) using an
interrupt line of the DSP. By writing to the SPI control register
(SPICLTx), the serial 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. 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 μs. When a higher sampling rate is
desired, use of one of the parallel interface modes is
recommended.
AD7654*
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)
0
30
57
-0
34
Figure 34. Interfacing the AD7654 to an SPI Interface
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