參數(shù)資料
型號： AD9639BCPZ-210
廠商： Analog Devices Inc
文件頁數(shù)： 17/36頁
文件大?。?/td> 0K
描述： IC ADC 12B 170MSPS QUAD 72LFCSP
標準包裝： 1
位數(shù)： 12
采樣率（每秒）： 210M
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 4
功率耗散（最大）： 1.22W
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 72-VFQFN 裸露焊盤，CSP
供應商設(shè)備封裝： 72-LFCSP
包裝： 托盤
輸入數(shù)目和類型： 8 個單端，單極；4 個差分，單極
AD9639
Data Sheet
Rev. B | Page 24 of 36
Continuous Synchronization
Continuous synchronization is part of the JESD204 specification.
The 12-bit word requires two octets to transmit all the data. The
two octets (MSB and LSB) are called a frame. When scrambling
is disabled and the LSB octets of two consecutive frames are the
same, the second LSB octet is replaced by a K28.7 comma symbol.
The receiver is responsible for replacing the K28.7 comma
symbol with the LSB octet of the previous frame.
When scrambling is enabled, any D28.7 symbols found in the
LSB octet of a frame are replaced with K28.7 comma symbols.
The receiver is responsible for replacing the K28.7 comma
symbols with D28.7 symbols when in this mode.
By looking for K28.7 symbols, the receiver can ensure that it is
still synchronized to the frame boundary.
07973-
205
IF /K28.7/
/REPLACE_K28.7/
IF (OCOUNTER == PREVIOUS_POSITION) AND /VALID/
/RESET_OCTET_COUNTER/
END IF;
IF /VALID/ | (OCOUNTER == N-1)
PREVIOUS_POSITION = OCOUNTER
END IF;
Figure 56. Pseudocode for Data Dependent Frame Synchronization in Receiver
Table 9. Variables and Functions in Data Dependent Frame Synchronization
Variable
Description
N
Number of octets in frame (octet indexing starts from 0).
/K28.7/
Asserted when the current symbol corresponds to the K28.7 control character.
OCOUNTER
Counter used to mark the position of the current octet in the frame.
PREVIOUS_POSITION
Variable that stores the position in the frame of a K28.7 symbol.
/REPLACE_K28.7/
Replace K28.7 at the decoder output as follows. When scrambling is disabled, replace K28.7 with the LSB
octet that was decoded at the same position in the previous frame; when scrambling is enabled, replace
K28.7 at the decoder output with D28.7.
/RESET_OCTET_COUNTER/
Reset octet counter to 0 at reception of next octet.
/VALID/
Asserted by receiver to indicate that the current symbol is a valid symbol given the current running disparity.
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