參數(shù)資料
型號(hào)： AD7490BRU-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 15/29頁(yè)
文件大?。?/td> 0K
描述： IC ADC 12BIT 16CH 28-TSSOP T/R
產(chǎn)品變化通告： IDD Specification Change 17/Jun/2009
Product Discontinuance 27/Oct/2011
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 12
采樣率（每秒）： 1M
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）： 12.5mW
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： 28-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 28-TSSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 16 個(gè)單端，單極
Data Sheet
AD7490
Rev. D | Page 21 of 28
Powering Up the AD7490
When supplies are first applied to the AD7490, the ADC may
power up in any of the operating modes of the part. To ensure
that the part is placed into the required operating mode, the
user should perform a dummy cycle operation, as outlined in
The three dummy conversion operations outlined in Figure 26
must be performed to place the part into either of the auto modes.
The first two conversions of this dummy cycle operation are
performed with the DIN line tied high, and for the third conver-
sion of the dummy cycle operation, the user should write the
desired control register configuration to the AD7490 to place
the part into the required auto mode. On the third CS rising
edge after the supplies are applied, the control register contains
the correct information and valid data results from the next
conversion.
Therefore, to ensure the part is placed into the correct operating
mode when supplies are first applied to the AD7490, the user
must first issue two serial write operations with the DIN line
tied high. On the third conversion cycle, the user can then write
to the control register to place the part into any of the operating
modes. The user should not write to the Shadow register until
the fourth conversion cycle after the supplies are applied to
the ADC to guarantee that the control register contains the
correct data.
If the user wishes to place the part into either normal mode or
full shutdown mode, the second dummy cycle with DIN tied
high can be omitted from the three dummy conversion
operation outlined in Figure 26.
02
691
-02
5
SCLK
1
12
16
1
12
16
1
12
16
DOUT
DIN
CS
DUMMY CONVERSION
CORRECT VALUE IN CONTROL
REGISTER VALID DATA FROM
NEXT CONVERSION USER CAN
WRITE TO SHADOW REGISTER
IN NEXT CONVERSION
INVALID DATA
DATA IN TO CONTROL
CONTROL REGISTER IS LOADED ON THE
FIRST 12 CLOCK EDGES
KEEP DIN LINE TIED HIGH FOR FIRST TWO DUMMY CONVERSIONS
Figure 26. Placing into the Required Operating Mode After Supplies Are Applied
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