EVAL-AD7476ACB Analog Devices Inc, EVAL-AD7476ACB Datasheet - Page 9
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EVAL-AD7476ACB
Manufacturer Part Number
EVAL-AD7476ACB
Description
BOARD EVAL FOR AD7476A
Manufacturer
Analog Devices Inc
Datasheet
1.EVAL-AD7476ACB.pdf
(28 pages)
Specifications of EVAL-AD7476ACB
Rohs Status
RoHS non-compliant
Number Of Adc's
1
Number Of Bits
12
Sampling Rate (per Second)
1M
Data Interface
Serial
Inputs Per Adc
1 Differential
Input Range
0 ~ 5.25 V
Power (typ) @ Conditions
17.5mW @ 1MSPS, 5 V
Voltage Supply Source
Single
Operating Temperature
-40°C ~ 85°C
Utilized Ic / Part
AD7476A
Lead Free Status / Rohs Status
Not Compliant
Timing Diagrams
Timing Example 1
Having f
time of
where:
t
requirement of 250 ns for t
From Figure 4, t
where:
t
satisfying the minimum requirement of 50 ns.
2
8
= 36 ns maximum. This allows a value of 204 ns for t
= 10 ns min, leaving t
t
2.5 (1/f
2
Figure 2. Load Circuit for Digital Output Timing Specifications
+ 12.5 (1/f
SDATA
SCLK
SCLK
SCLK
CS
CS
TO OUTPUT
SCLK
= 20 MHz and a throughput of 1 MSPS, a cycle
THREE-
) + t
STATE
ACQ
SCLK
PIN
is comprised of
8
) + t
+ t
t
t
2
50pF
2
Z
ACQ
QUIET
C
1
1
ACQ
t
L
3
ZERO
ACQ
to be 365 ns. This 365 ns satisfies the
4 LEADING ZEROS
= 1 μs
200 μ A
200 μ A
.
2
2
ZERO
I
I
OH
OL
3
3
ZERO
t
4
12.5(1/f
1.6V
4
Figure 3. AD7476A Serial Interface Timing Diagram
4
SCLK
DB11
t
Figure 4. Serial Interface Timing Example
6
t
)
CONVERT
QUIET
5
5
t
CONVERT
t
DB10
7
,
Rev. E | Page 9 of 28
1/THROUGHPUT
13
13
B
B
DB2
Timing Example 2
Having f
cycle time of
where:
t
the requirement of 250 ns for t
From Figure 4, t
This allows a value of 128 ns for t
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 t
conversions. In Example 2, acquire the signal fully at
approximately Point C in Figure 4.
2
= 10 ns min, this leaves t
14
t
2.5 (1/f
14
2
t
5
+ 12.5 (1/f
DB1
SCLK
C
SCLK
= 5 MHz and a throughput is 315 kSPS yields a
15
15
) + t
ACQ
DB0
SCLK
AD7476A/AD7477A/AD7478A
t
is comprised of
8
ACQ
) + t
16
+ t
t
16
8
QUIET
ACQ
t
8
ACQ
THREE-STATE
, t
= 3.174 μs
8
to be 664 ns. This 664 ns satisfies
ACQ
= 36 ns maximum
t
.
QUIET
t
QUIET
QUIET
t
1
, satisfying the minimum
QUIET
between