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AD7478ART-500RL7 датащи(PDF) 5 Page - Analog Devices

номер детали AD7478ART-500RL7
подробное описание детали  1 MSPS, 12-/10-/8-Bit ADCs in 6-Lead SOT-23
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AD7478ART-500RL7 датащи(HTML) 5 Page - Analog Devices

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REV. D
AD7476/AD7477/AD7478
–5–
TIMING SPECIFICATIONS1, 2 (V
DD = 2.35 V to 5.25 V, TA = TMIN to TMAX, unless otherwise noted.)
Limit at TMIN, TMAX
AD7476/AD7477/AD7478
Parameter
3 V
3
5V
3
Unit
Description
fSCLK
4
10
10
kHz min
20
20
MHz max
A Version
12
12
MHz max
B Version
tCONVERT
16
× tSCLK
16
× tSCLK
tQUIET
50
50
ns min
Minimum Quiet Time Required between Bus Relinquish and
Start of Next Conversion
t1
10
10
ns min
Minimum
CS Pulsewidth
t2
10
10
ns min
CS to SCLK Setup Time
t3
5
20
20
ns max
Delay from
CS until SDATA Three-State Disabled
t4
5
40
20
ns max
Data Access Time after SCLK Falling Edge, A Version
70
20
ns max
Data Access Time after SCLK Falling Edge, B Version
t5
0.4
× t
SCLK
0.4
× t
SCLK
ns min
SCLK Low Pulsewidth
t6
0.4
× tSCLK
0.4
× tSCLK
ns min
SCLK High Pulsewidth
t7
10
10
ns min
SCLK to Data Valid Hold Time
t8
6
10
10
ns min
SCLK Falling Edge to SDATA High Impedance
25
25
ns max
SCLK Falling Edge to SDATA High Impedance
tPOWER-UP
7
11
µs typ
Power-Up Time from Full Power-Down
NOTES
1Guaranteed by characterization. All input signals are specified with tr = tf = 5 ns (10% to 90% of V
DD) and timed from a voltage level of 1.6 V.
2A Version timing specifications apply to the AD7477 S Version and AD7478 S Version; B Version timing specifications apply to the AD7476 S Version.
33 V specifications apply from V
DD = 2.7 V to 3.6 V for A Version; 3 V specifications apply from V DD = 2.35 V to 3.6 V for B Version; 5 V specifications apply from
VDD = 4.75 V to 5.25 V.
4Mark/Space ratio for the SCLK input is 40/60 to 60/40.
5Measured with the load circuit of Figure 1 and defined as the time required for the output to cross 0.8 V or 2.0 V.
6t
8 is derived from the measured time taken by the data outputs to change 0.5 V when loaded with the circuit of Figure 1. The measured number is then extrapolated
to remove the effects of charging or discharging the 50 pF capacitor. This means that the time, t8, quoted in the Timing Specifications is the true bus relinquish time
of the part and is independent of the bus loading.
7See Power-Up Time section.
Specifications subject to change without notice.
200 A
IOL
200 A
IOH
CL
50pF
TO OUTPUT
PIN
1.6V
Figure 1. Load Circuit for Digital Output Timing
Specifications


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