参数资料
型号: AD5749ACPZ-RL7
厂商: Analog Devices Inc
文件页数: 16/28页
文件大小: 0K
描述: IC CURRENT OUT DVR 32-LFCSP
标准包装: 1
放大器类型: 仪表
电路数: 1
电流 - 电源: 5.2mA
电流 - 输出 / 通道: 24mA
电压 - 电源,单路/双路(±): 10.8 V ~ 55 V
工作温度: -40°C ~ 105°C
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘,CSP
供应商设备封装: 32-LFCSP-VQ(5x5)
包装: 标准包装
其它名称: AD5749ACPZ-RL7DKR
Data Sheet
AD5749
Rev. B | Page 23 of 28
PACKET ERROR CHECKING
To verify that data has been received correctly in noisy
environments, the AD5749 offers the option of error checking
based on an 8-bit (CRC-8) cyclic redundancy check. The device
controlling the AD5749 should generate an 8-bit frame check
sequence using the following polynomial:
C(x) = x8 + x2 + x1 + 1
This is added to the end of the data-word, and 24 data bits are
sent to the AD5749 before taking SYNC high. If the AD5749
receives a 24-bit data frame, it performs the error check
when SYNC goes high. If the check is valid, then the data is
written to the selected register. If the error check fails, the
FAULT pin goes low and Bit D3 of the status register is set.
After reading this register, this error flag is cleared
automatically and the FAULT pin goes high again.
Figure 34. PEC Error Checking Timing
SCLK
SDIN
SYNC
UPDATE ON SYNC HIGH
D15
(MSB)
D0
(LSB)
16-BIT DATA
16-BIT DATA TRANSFER—NO ERROR CHECKING
SCLK
SDIN
SYNC
FAULT
UPDATE AFTER SYNC HIGH
ONLY IF ERROR CHECK PASSED
FAULT GOES LOW IF
ERROR CHECK FAILS
D23
(MSB)
D8
(LSB)
D7
D0
16-BIT DATA
8-BIT FCS
16-BIT DATA TRANSFER WITH ERROR CHECKING
08923-
035
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