參數(shù)資料
型號： EVAL-AD7682EDZ
廠商： Analog Devices Inc
文件頁數(shù)： 19/32頁
文件大?。?/td> 0K
描述： BOARD EVAL AD7682
標(biāo)準(zhǔn)包裝： 1
系列： PulSAR®
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 250k
數(shù)據(jù)接口： 串行
輸入范圍： ±VREF
在以下條件下的電源（標(biāo)準(zhǔn)）： 12.5mW @ 250kSPS，5V
工作溫度： -40°C ~ 85°C
已用 IC / 零件： AD7682
已供物品： 板
AD7682/AD7689
Data Sheet
Rev. D | Page 26 of 32
GENERAL TIMING WITHOUT A BUSY INDICATOR
Figure 37 details the timing for all three modes: read/write
during conversion (RDC), read/write after conversion (RAC),
and read/write spanning conversion (RSC). Note that the gating
item for both CFG and data readback is at the end of conversion
(EOC). At EOC, if CNV is high, the busy indicator is disabled.
As detailed previously in the Digital Interface section, the data
access should occur up to safe data reading/writing time, tDATA.
If the full CFG word was not written to prior to EOC, it is dis-
carded and the current configuration remains. If the conversion
result is not read out fully prior to EOC, it is lost as the ADC
updates SDO with the MSB of the current conversion. For
detailed timing, refer to Figure 40 and Figure 41, which depict
reading/writing spanning conversion with all timing details,
including setup, hold, and SCK.
When CNV is brought low after EOC, SDO is driven from high
impedance to the MSB. Falling SCK edges clock out bits starting
with MSB 1.
The SCK can idle high or low depending on the clock polarity
(CPOL) and clock phase (CPHA) settings if SPI is used. A simple
solution is to use CPOL = CPHA = 0 as shown in Figure 37 with
SCK idling low.
From power-up, in any read/write mode, the first three conver-
sion results are undefined because a valid CFG does not take
place until the 2nd EOC; thus two dummy conversions are
required. Also, if the state machine writes the CFG during the
power-up state (RDC shown), the CFG register needs to be
rewritten again at the next phase. Note that the first valid data
occurs in Phase (n + 1) when the CFG register is written during
Phase (n 1).
ACQUISITION
(n – 1) UNDEFINED
ACQUISITION
(n)
ACQUISITION
(n + 1)
ACQUISITION
(n + 2)
PHASE
POWER
UP
EOC
SOC
EOC
CONVERSION
(n – 1) UNDEFINED
CONVERSION
(n)
CONVERSION
(n + 1)
CONVERSION
(n – 2) UNDEFINED
07
35
3-
0
43
tCONV
tCYC
tDATA
CNV
DIN
SDO
XXX
MSB
XXX
MSB
XXX
NOTES
1. CNV MUST BE HIGH PRIOR TO THE END OF CONVERSION (EOC) TO AVOID THE BUSY INDICATOR.
2. A TOTAL OF 16 SCK FALLING EDGES ARE REQUIRED TO RETURN SDO TO HIGH-Z. IF CFG READBACK IS ENABLED, A TOTAL OF 30 SCK FALLING EDGES IS
REQUIRED TO RETURN SDO TO HIGH-Z.
DATA (n)
DATA (n – 1)
XXX
DATA (n – 1)
XXX
DATA (n – 1)
XXX
DATA (n – 1)
XXX
DATA (n – 2)
XXX
DATA (n – 2)
XXX
DATA (n – 2)
XXX
DATA (n – 2)
XXX
DATA (n – 3)
XXX
MSB
(n)
MSB
(n + 1)
DIN
SDO
DATA (n + 1)
DATA (n)
DATA (n + 1)
DIN
CFG (n)
CFG (n + 2)
CFG (n + 1)
CFG (n + 3)
SDO
SCK
116
16
NOTE 2
1
SCK
116
16
nn
n
n + 1
n
1
SCK
1
116
16
1
CFG (n)
CFG (n + 1)
CFG (n + 2)
RDC
RAC
RSC
CFG (n)
CFG (n + 1)
CFG (n + 2)
CFG (n + 3)
NOTE 2
NOTE 1
Figure 37. General Interface Timing for the AD7682/AD7689 Without a Busy Indicator
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