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參數資料
型號: AD7718BRU
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: 8-/10-Channel, Low Voltage, Low Power, ADCs
中文描述: 10-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28
封裝: PLASTIC, TSSOP-28
文件頁數: 9/44頁
文件大小: 339K
代理商: AD7718BRU
REV. 0
AD7708/AD7718
–9–
TIMING CHARACTERISTICS
1, 2
(AV
DD
= 2.7 V to 3.6 V or AV
DD
= 5 V 5%; DV
DD
= 2.7 V to 3.6 V or DV
DD
= 5 V 5%; AGND =
DGND = 0 V; XTAL = 32.768 kHz; Input Logic 0 = 0 V, Logic 1 = DV
DD
unless otherwise noted.
Limit at T
MIN
, T
MAX
(B Version)
Parameter
Unit
Conditions/Comments
t
1
t
2
Read Operation
t
3
t
4
t
54
32.768
50
kHz typ
ns min
Crystal Oscillator Frequency
RESET
Pulsewidth
0
0
0
60
80
0
60
80
100
100
0
10
80
100
ns min
ns min
ns min
ns max
ns max
ns min
ns max
ns max
ns min
ns min
ns min
ns min
ns max
ns max
RDY
to
CS
Setup Time
CS
Falling Edge to SCLK Active Edge Setup Time
3
SCLK Active Edge to Data Valid Delay
3
DV
DD
= 4.5 V to 5.5 V
DV
DD
= 2.7 V to 3.6 V
CS
Falling Edge to Data Valid Delay
3
DV
DD
= 4.5 V to 5.5 V
DV
DD
= 2.7 V to 3.6 V
SCLK High Pulsewidth
SCLK Low Pulsewidth
CS
Rising Edge to SCLK Inactive Edge Hold Time
3
Bus Relinquish Time after SCLK Inactive Edge
3
t
5A4, 5
t
6
t
7
t
8
t
96
t
10
SCLK Active Edge to
RDY
High
3, 7
Write Operation
t
11
t
12
t
13
t
14
t
15
t
16
0
30
25
100
100
0
ns min
ns min
ns min
ns min
ns min
ns min
CS
Falling Edge to SCLK Active Edge Setup Time
3
Data Valid to SCLK Edge Setup Time
Data Valid to SCLK Edge Hold Time
SCLK High Pulsewidth
SCLK Low Pulsewidth
CS
Rising Edge to SCLK Edge Hold Time
NOTES
1
Sample 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.
2
See Figures 1 and 2.
3
SCLK active edge is falling edge of SCLK.
4
These 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 V
OH
limits.
5
This specification only comes into play if CS goes low while SCLK is low. It is required primarily for interfacing to DSP machines.
6
These 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
I
SINK
I
SOURCE
(200 A WITH DV
DD
= 5V
100 A WITH DV
DD
= 3V)
1.6V
(1.6mA WITH DV
DD
= 5V
100 A WITH DV
DD
= 3V)
Figure 1. Load Circuit for Timing Characterization
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