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參數(shù)資料
| 型號： | AD9985KSTZ-140 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 20/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC INTERFACE 8BIT 140MSPS 80LQFP |
| 產(chǎn)品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標準包裝： | 90 |
| 應用： | 視頻 |
| 接口： | 串行 |
| 電源電壓： | 2.2 V ~ 3.45 V |
| 封裝/外殼： | 80-LQFP |
| 供應商設備封裝： | 80-LQFP（14x14） |
| 包裝： | 管件 |
| 安裝類型： | 表面貼裝 |
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AD9985
Rev. 0 | Page 27 of 32
Data is read from the control registers of the AD9985 in a
similar manner. Reading requires two data transfer operations:
The base address must be written with the R/W bit of the slave
address byte low to set up a sequential read operation.
Reading (the R/W bit of the slave address byte high) begins at
the previously established base address. The address of the read
register autoincrements after each byte is transferred.
To terminate a read/write sequence to the AD9985, a stop signal
must be sent. A stop signal comprises a low-to-high transition
of SDA while SCL is high.
A repeated start signal occurs when the master device driving
the serial interface generates a start signal without first
generating a stop signal to terminate the current communi-
cation. This is used to change the mode of communication
(read, write) between the slave and master without releasing the
serial interface lines.
Serial Interface Read/Write Examples
Write to one control register
Start Signal
Slave Address Byte (R/W Bit = Low)
Base Address Byte
Data Byte to Base Address
Stop Signal
Write to four consecutive control registers
Start Signal
Slave Address Byte (R/W Bit = Low)
Base Address Byte
Data Byte to Base Address
Data Byte to (Base Address + 1)
Data Byte to (Base Address + 2)
Data Byte to (Base Address + 3)
Stop Signal
Read from one control register
Start Signal
Slave Address Byte (R/W Bit = Low)
Base Address Byte
Start Signal
Slave Address Byte (R/W Bit = High)
Data Byte from Base Address
Stop Signal
Read from four consecutive control registers
Start Signal
Slave Address Byte (R/W Bit = Low)
Base Address Byte
Start Signal
Slave Address Byte (R/W Bit = High)
Data Byte from Base Address
Data Byte from (Base Address + 1)
Data Byte from (Base Address + 2)
Data Byte from (Base Address + 3)
Stop Signal
BIT 7
ACK
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
SDA
SCL
04799-0-014
Figure 13. Serial Interface—Typical Byte Transfer
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