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AD7476ABRM-REEL Datasheet(PDF) 9 Page - Analog Devices

No. de pieza AD7476ABRM-REEL
Descripción Electrónicos  2.35 V to 5.25 V, 1 MSPS 12-/10-/8-Bit ADCs in 6-Lead SC70
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD7476ABRM-REEL Datasheet(HTML) 9 Page - Analog Devices

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AD7476A/AD7477A/AD7478A
Rev. F | Page 9 of 28
Timing Diagrams
TO OUTPUT
PIN
CL
50pF
200
µA
IOH
200
µA
IOL
1.6V
Figure 2. Load Circuit for Digital Output Timing Specifications
Timing Example 1
Having fSCLK = 20 MHz and a throughput of 1 MSPS, a cycle
time of
t2 + 12.5 (1/fSCLK) + tACQ = 1 µs
where:
t2 = 10 ns min, leaving tACQ to be 365 ns. This 365 ns satisfies the
requirement of 250 ns for tACQ.
From Figure 4, tACQ is comprised of
2.5 (1/fSCLK) + t8 + tQUIET
where:
t8 = 36 ns maximum. This allows a value of 204 ns for tQUIET,
satisfying the minimum requirement of 50 ns.
Timing Example 2
Having fSCLK = 5 MHz and a throughput is 315 kSPS yields a
cycle time of
t2 + 12.5 (1/fSCLK) + tACQ = 3.174 µs
where:
t2 = 10 ns min, this leaves tACQ to be 664 ns. This 664 ns satisfies
the requirement of 250 ns for tACQ.
From Figure 4, tACQ is comprised of
2.5 (1/fSCLK) + t8 + tQUIET, t8 = 36 ns maximum
This allows a value of 128 ns for tQUIET, satisfying the minimum
requirement of 50 ns.
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, acquire the signal fully 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
1
3
13
14
15
16
t1
4
5
2
Figure 3. AD7476A Serial Interface Timing Diagram
CS
SCLK
t2
tCONVERT
B
1
2
5
13
14
15
16
C
t8
tQUIET
tACQ
12.5(1/fSCLK)
1/THROUGHPUT
3
4
Figure 4. Serial Interface Timing Example


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