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AD7478AARM-REEL7 датащи(PDF) 7 Page - Analog Devices

номер детали AD7478AARM-REEL7
подробное описание детали  2.35 V to 5.25 V, 1 MSPS, 12-/10-/8-Bit ADCs in 6-Lead SC70
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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REV. C
AD7476A/AD7477A/AD7478A
–7–
Timing Example 1
Having fSCLK = 20 MHz and a throughput of 1 MSPS gives a
cycle time of t2 + 12.5 (1/fSCLK) + tACQ = 1
µs. With t
2 = 10 ns min,
this leaves tACQ to be 365 ns. This 365 ns satisfies the requirement
of 250 ns for tACQ. From Figure 3, tACQ is comprised of 2.5 (1/fSCLK)
+ t8 + tQUIET, where t8 = 36 ns max. This allows a value of 204 ns
for tQUIET, satisfying the minimum requirement of 50 ns.
CS
SCLK
SDATA
t2
t6
t3
t4
t7
t5
t8
tCONVERT
tQUIET
ZERO
ZERO
ZERO
DB11
DB10
DB2
DB1
DB0
B
THREE-STATE
THREE-
STATE
Z
4 LEADING ZEROS
12
345
13
14
15
16
t1
Figure 2. AD7476A Serial Interface Timing Diagram
CS
SCLK
t2
tCONVERT
B
1
234
5
13
14
15
16
C
t8
tQUIET
tACQ
12.5(1/fSCLK)
1/THROUGHPUT
Figure 3. Serial Interface Timing Example
Timing Example 2
Having fSCLK = 5 MHz and a throughput of 315 kSPS gives a
cycle time of t2 + 12.5 (1/fSCLK) + tACQ = 3.174
µs. With t
2 =
10 ns min, this leaves tACQ to be 664 ns. This 664 ns satisfies
the requirement of 250 ns for tACQ. From Figure 3, tACQ is
comprised of 2.5 (1/fSCLK) + t8 + tQUIET, t8 = 36 ns max. This
allows a value of 128 ns for tQUIET, satisfying the minimum
requirement of 50 ns. As in this example and with other slower
clock values, the signal may already be acquired before the
conversion is complete, but it is still necessary to leave 50 ns
minimum tQUIET between conversions. In Example 2, the
signal should be fully acquired at approximately Point C in
Figure 3.


Аналогичный номер детали - AD7478AARM-REEL7

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Аналогичное описание - AD7478AARM-REEL7

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