參數(shù)資料
型號： AD7705BRU
廠商： Analog Devices Inc
文件頁數(shù)： 27/44頁
文件大?。?/td> 0K
描述： IC ADC 16BIT 2CH 16-TSSOP
標準包裝： 96
位數(shù)： 16
采樣率（每秒）： 500
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 1mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-TSSOP（0.173"，4.40mm 寬）
供應商設備封裝： 16-TSSOP
包裝： 管件
輸入數(shù)目和類型： 2 個差分，單極；2 個差分，雙極
配用： EVAL-AD7705EBZ-ND - BOARD EVALUATION FOR AD7705
AD7705/AD7706
Rev. C | Page 33 of 44
CONFIGURING THE AD7705/AD7706
The AD7705/AD7706 contain six on-chip registers that the user
can access via the serial interface. Communication with any of
these registers is initiated by first writing to the communication
register. Figure 21 outlines a flowchart of the sequence used to
configure registers after a power-up or reset on the AD7705;
similar procedures apply to the AD7706.
The flowchart also shows two read options—one polls the DRDY
pin, and the other interrogates the DRDY pin. In addition,
Figure 21 shows a series of words that should be written to the
registers for the following operating conditions: Gain 1, no
filter sync, bipolar mode, buffer off, clock of 4.9512 MHz, and
output rate of 50 Hz.
POWER-ON/RESET FOR AD7705
CONFIGURE & INITIALIZE
μC/μP SERIAL PORT
WRITE TO COMMUNICATIONS REGISTER SELECTING
CHANNEL & SETTING UP NEXT OPERATION TO BE A
WRITE TO THE CLOCK REGISTER (20 HEX)
WRITE TO CLOCK REGISTER SETTING THE CLOCK
BITS IN ACCORDANCE WITH THE APPLIED MASTER
CLOCK SIGNAL AND SELECT UPDATE RATE FOR
SELECTED CHANNEL (0C HEX)
WRITE TO COMMUNICATIONS REGISTER SELECTING
CHANNEL & SETTING UP NEXT OPERATION TO BE A
WRITE TO THE SETUP REGISTER (10 HEX)
WRITE TO SETUP REGISTER CLEARING F SYNC,
SETTING UP GAIN, OPERATING CONDITIONS &
INITIATING A SELF-CALIBRATION ON SELECTED
CHANNEL (40 HEX)
POLL DRDY PIN
NO
YES
WRITE TO COMMUNICATIONS REGISTER SETTING UP
NEXT OPERATION TO BE A READ FROM THE DATA
REGISTER (38 HEX)
READ FROM DATA REGISTER
WRITE TO COMMUNICATIONS REGISTER SETTING UP NEXT
OPERATION TO BE A READ FROM THE COMMUNICATIONS
REGISTER (08 HEX)
READ FROM COMMUNICATIONS REGISTER
POLL DRDY BIT OF COMMUNICATIONS REGISTER
WRITE TO COMMUNICATIONS REGISTER SETTING UP
NEXT OPERATION TO BE A READ FROM THE DATA
REGISTER (38 HEX)
START
READ FROM DATA REGISTER
DRDY
LOW?
NO
YES
DRDY
LOW?
01166-
021
Figure 21. Flowchart for Setting Up and Reading from the AD7705
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