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AD7920BKSZ-REEL7 датащи(PDF) 7 Page - Analog Devices

номер детали AD7920BKSZ-REEL7
подробное описание детали  250 kSPS, 10-/12-Bit ADCs in 6-Lead SC70
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD7920BKSZ-REEL7 датащи(HTML) 7 Page - Analog Devices

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AD7910/AD7920
Rev. C | Page 7 of 24
TIMING EXAMPLES
Figure 3 and Figure 4 show some of the timing parameters from
Table 3.
TIMING EXAMPLE 1
From Figure 4, having fSCLK = 5 MHz and a throughput rate of
250 kSPS gives a cycle time of t2 + 12.5(1/fSCLK) + tACQ = 4 μs.
With t2 = 10 ns min, this leaves tACQ to be 1.49 μs. This 1.49 μs
satisfies the requirement of 250 ns for tACQ. From Figure 4, tACQ
comprises 2.5(1/fSCLK) + t8 + tQUIET, where t8 = 36 ns max. This
allows a value of 954 ns for tQUIET, satisfying the minimum
requirement of 50 ns.
TIMING EXAMPLE 2
The AD7920 can also operate with slower clock frequencies.
From Figure 4, having fSCLK = 3.4 MHz and a throughput rate of
150 kSPS gives a cycle time of t2 + 12.5(1/fSCLK) + tACQ = 6.66 μs.
With t2 = 10 ns min, this leaves tACQ to be 2.97 μs. This 2.97 μs
satisfies the requirement of 250 ns for tACQ. From Figure 4, tACQ
comprises 2.5(1/fSCLK) + t8 + tQUIET, t8 = 36 ns max. This allows a
value of 2.19 μs 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 this example, the signal should be fully
acquired at approximately Point C in Figure 4.
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
3
4
5
13
14
15
16
t1
Figure 3. AD7920 Serial Interface Timing Diagram
CS
SCLK
t2
tCONVERT
B
12
3
4
5
13
14
15
16
C
t8
tQUIET
tACQ
12.5(1/fSCLK)
1/THROUGHPUT
Figure 4. Serial Interface Timing Example


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