參數(shù)資料
型號： AD7856ARZ-REEL7
廠商： Analog Devices Inc
文件頁數(shù)： 20/32頁
文件大?。?/td> 0K
描述： IC ADC 14BIT 8CHAN 5V 24SOIC
產(chǎn)品變化通告： Product Discontinuance 27/Oct/2011
標準包裝： 400
位數(shù)： 14
采樣率（每秒）： 285k
數(shù)據(jù)接口： 8051，QSPI?，串行，SPI? µP
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 89.25mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 105°C
安裝類型： 表面貼裝
封裝/外殼： 24-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 24-SOIC W
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 8 個單端，單極；4 個偽差分，單極
AD7856
–27–
REV. A
Interface Mode 2 Configuration
Figure 35 shows the flowchart for configuring the part in Inter-
face Mode 2. In this case the read and write operations take
place simultaneously via the serial port. Writing all 0s ensures
APPLY
SYNC (IF REQUIRED), SCLK, WRITE
TO CONTROL REGISTER SETTING NEXT
CHANNEL, CONVST BIT TO 1, READ
PREVIOUS CONVERSION RESULT ON
DOUT PIN (NOTE 1)
INITIATE
CONVERSION
IN
SOFTWARE
?
START
POWER-ON, APPLY CLKIN SIGNAL,
WAIT 150ms FOR AUTOMATIC CALIBRATION
PULSE
CONVST PIN
WAIT FOR BUSY SIGNAL TO GO LOW
OR
WAIT FOR BUSY BIT = 0
NO
SERIAL
INTERFACE
MODE
?
NO
YES
APPLY
SYNC (IF REQUIRED), SCLK, READ
CURRENT CONVERSION RESULT ON
DOUT PIN, AND WRITE CHANNEL SELECTION
NOTE 1: WHEN USING THE SOFTWARE CONVERSION START AND TRANSFERRING DATA
DURING CONVERSION, THE USER MUST ENSURE THAT THE CONTROL REGISTER WRITE
OPERATION EXTENDS BEYOND THE FALLING EDGE OF BUSY. THE FALLING EDGE OF
BUSY RESETS THE CONVST BIT TO 0 AND ONLY AFTER THIS TIME CAN IT BE
REPROGRAMMED TO 1 TO START THE NEXT CONVERSION.
WAIT APPROX 200ns AFTER
CONVST RISING EDGE
APPLY
SYNC (IF REQUIRED), SCLK, READ
PREVIOUS CONVERSION RESULT ON DOUT
PIN, AND WRITE CHANNEL SELECTION
TRANSFER
DATA DURING
CONVERSION
?
NO
APPLY
SYNC (IF REQUIRED), SCLK, WRITE
TO CONTROL REGISTER SETTING NEXT
CHANNEL, CONVST BIT TO 1, READ
RESULT ON DOUT PIN FOR
CONVERSION JUST COMPLETED
WAIT FOR BUSY SIGNAL TO GO LOW
OR
WAIT FOR BUSY BIT = 0
YES
2
TRANSFER
DATA DURING
CONVERSION
?
Figure 35. Flowchart for Setting Up, Reading and Writing in Interface Mode 2
that no valid data is written to any of the registers. When using
the software conversion start and transferring data during con-
version, Note 1 must be obeyed.
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