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AD7356YRUZ-500RL7 PDF预览

AD7356YRUZ-500RL7

更新时间: 2024-01-26 16:05:53
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
18页 192K
描述
Differential Input, Dual, 5 MSPS, 12-Bit, SAR ADC

AD7356YRUZ-500RL7 数据手册

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Preliminary Technical Data  
SERIAL INTERFACE  
AD7356  
back into three-state on the 32nd SCLK falling edge or the rising  
Figure 19 shows the detailed timing diagram for serial  
interfacing to the AD7356. The serial clock provides the  
conversion clock and controls the transfer of information from  
the AD7356 during conversion.  
CS  
edge of , which ever occurs first.  
A minimum of 14 serial clock cycles are required to perform  
the conversion process and to access data from one conversion  
CS  
on either data line of the AD7356.  
going low provides the  
CS  
The  
signal initiates the data transfer and conversion process.  
CS  
leading zero to be read in by the microcontroller or DSP. The  
remaining data is then clocked out by subsequent SCLK falling  
edges, beginning with a second leading zero. Thus, the first  
falling clock edge on the serial clock has the leading zero  
provided and also clocks out the second leading zero. The 12-bit  
result then follows with the final bit in the data transfer valid on  
the 14th falling edge, having being clocked out on the previous  
(13th) falling edge. In applications with a slower SCLK, it may be  
possible to read in data on each SCLK rising edge depending on  
The falling edge of  
puts the track and hold into hold mode at  
which point the analog input is sampled and the bus is taken  
out of three-state. The conversion is also initiated at this point  
and requires a minimum of 14 SCL to complete. Once 13 SCLK  
falling edges have elapsed, the track and hold will go back into  
track on the next SCLK rising edge, as shown in Figure 19 at  
point B. If a 16 bit data transfer is used on the AD7356, then  
two trailing zeros will appear after the final LSB. On the rising  
edge of , the conversion will be terminated and SDATAA and  
SDATAB will go back into three-state. If  
but is instead held low for a further 14 SCLK cycles on SDATAA,  
the data from the conversion on ADCB will be output on  
SDATAA.  
CS  
CS  
the SCLK frequency. The first rising edge of SCLK after the  
CS  
is not brought high,  
falling edge would have the second leading zero provided, and  
the 13th rising SCLK edge would have DB0 provided.  
CS  
Likewise, is  
is held low for a further 14 SCLK cycles on  
SDATAA, the data from the conversion on ADCA will be output  
on SDATAB. This is illustrated in Figure 20 where the case for  
SDATAA is shown. In this case, the SDATA line in use will go  
tACQUISITION  
CS  
t9  
tCONVERT  
t2  
t6  
B
SCLK  
3
4
5
1
2
13  
t5  
tQUIET  
t8  
t7  
t3  
t4  
D
D
A
B
OUT  
OUT  
0
DB11  
DB10  
DB2  
0
DB9  
DB8  
DB1  
DB0  
THREE-STATE  
THREE-  
STATE  
2 LEADING ZEROS  
Figure 19. Serial Interface Timing Diagram  
CS  
t6  
t2  
SCLK  
3
4
5
1
2
14  
15  
16  
17  
32  
t5  
t10  
t3  
t4  
t7  
DB11  
DB10  
DB9  
DB11  
B
0
ZERO  
ZERO  
ZERO  
ZERO  
ZERO  
ZERO  
ZERO  
D
A
A
A
A
OUT  
THREE-  
STATE  
THREE-  
STATE  
2 TRAILING ZEROS  
2 LEADING ZEROS  
2 LEADING  
ZEROS  
2 TRAILING ZEROS  
Figure 20. Reading Data from Both ADCs on One SDATA Line with 32 SCLKs  
Rev. PrC | Page 15 of 18  

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