TIMING CHARACTERISTICS1, 2 (AV DD
參數(shù)資料
型號: EVAL-AD7708EBZ
廠商: Analog Devices Inc
文件頁數(shù): 44/44頁
文件大?。?/td> 0K
描述: BOARD EVAL FOR AD7708
標準包裝: 1
ADC 的數(shù)量: 1
位數(shù): 16
采樣率(每秒): 1.37k
數(shù)據(jù)接口: 串行
輸入范圍: ±2.5 V
在以下條件下的電源(標準): 3.84mW @ 3V
工作溫度: -40°C ~ 85°C
已用 IC / 零件: AD7708
已供物品: 板,CD
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其它名稱: EVAL-AD7708EB
EVAL-AD7708EB-ND
REV. 0
AD7708/AD7718
–9–
TIMING CHARACTERISTICS1, 2 (AV
DD = 2.7 V to 3.6 V or AVDD = 5 V
5%; DVDD = 2.7 V to 3.6 V or DVDD = 5 V
5%; AGND =
DGND = 0 V; XTAL = 32.768 kHz; Input Logic 0 = 0 V, Logic 1 = DVDD unless otherwise noted.
Limit at TMIN, TMAX
Parameter
(B Version)
Unit
Conditions/Comments
t1
32.768
kHz typ
Crystal Oscillator Frequency
t2
50
ns min
RESET Pulsewidth
Read Operation
t3
0
ns min
RDY to CS Setup Time
t4
0
ns min
CS Falling Edge to SCLK Active Edge Setup Time3
t5
4
0
ns min
SCLK Active Edge to Data Valid Delay3
60
ns max
DVDD = 4.5 V to 5.5 V
80
ns max
DVDD = 2.7 V to 3.6 V
t5A
4, 5
0
ns min
CS Falling Edge to Data Valid Delay3
60
ns max
DVDD = 4.5 V to 5.5 V
80
ns max
DVDD = 2.7 V to 3.6 V
t6
100
ns min
SCLK High Pulsewidth
t7
100
ns min
SCLK Low Pulsewidth
t8
0
ns min
CS Rising Edge to SCLK Inactive Edge Hold Time3
t9
6
10
ns min
Bus Relinquish Time after SCLK Inactive Edge3
80
ns max
t10
100
ns max
SCLK Active Edge to
RDY High3, 7
Write Operation
t11
0
ns min
CS Falling Edge to SCLK Active Edge Setup Time3
t12
30
ns min
Data Valid to SCLK Edge Setup Time
t13
25
ns min
Data Valid to SCLK Edge Hold Time
t14
100
ns min
SCLK High Pulsewidth
t15
100
ns min
SCLK Low Pulsewidth
t16
0
ns min
CS Rising Edge to SCLK Edge Hold Time
NOTES
1Sample tested during initial release to ensure compliance. All input signals are specified with tr = tf = 5 ns (10% to 90% of DV
DD) and timed from a voltage
level of 1.6 V.
2See Figures 1 and 2.
3SCLK active edge is falling edge of SCLK.
4These numbers are measured with the load circuit of Figure 1 and defined as the time required for the output to cross the V
OL or VOH limits.
5This specification only comes into play if CS goes low while SCLK is low. It is required primarily for interfacing to DSP machines.
6These numbers are derived from the measured time taken by the data output to change 0.5 V when loaded with the load circuit of Figure 1. The measured number is
then extrapolated back to remove effects of charging or discharging the 50 pF capacitor. This means that the times quoted in the timing characteristics are the true
bus relinquish times of the part and as such are independent of external bus loading capacitances.
7
RDY returns high after the first read from the device after an output update. The same data can be read again, if required, while RDY is high, although care should
be taken that subsequent reads do not occur close to the next output update.
Specifications subject to change without notice.
TO OUTPUT
PIN
50pF
ISINK
ISOURCE
1.6V
(1.6mA WITH DVDD = 5V
100 A WITH DVDD = 3V)
(200 A WITH DVDD = 5V
100 A WITH DVDD = 3V)
Figure 1. Load Circuit for Timing Characterization
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