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AD7478AARM-REEL7 데이터시트(PDF) 6 Page - Analog Devices

부품명 AD7478AARM-REEL7
상세설명  2.35 V to 5.25 V, 1 MSPS, 12-/10-/8-Bit ADCs in 6-Lead SC70
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AD7478AARM-REEL7 데이터시트(HTML) 6 Page - Analog Devices

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REV. C
–6–
AD7476A/AD7477A/AD7478A
TIMING SPECIFICATIONS1 (V
DD = 2.35 V to 5.25 V; TA = TMIN to TMAX, unless otherwise noted.)
Limit at TMIN, TMAX
Parameter
AD7476A/AD7477A/AD7478A
Unit
Description
fSCLK
2
10
kHz min
3
A, B Grades
20
kHz min
3
Y Grade
20
MHz max
tCONVERT
16
tSCLK
AD7476A
14
tSCLK
AD7477A
12
tSCLK
AD7478A
tQUIET
50
ns min
Minimum Quiet Time Required between Bus Relinquish
and Start of Next Conversion
t1
10
ns min
Minimum
CS Pulse Width
t2
10
ns min
CS to SCLK Setup Time
t3
4
22
ns max
Delay from
CS until SDATA Three-State Disabled
t4
4
40
ns max
Data Access Time after SCLK Falling Edge
t5
0.4 tSCLK
ns min
SCLK Low Pulse Width
t6
0.4 tSCLK
ns min
SCLK High Pulse Width
t7
5
SCLK to Data Valid Hold Time
10
ns min
VDD
≤ 3.3 V
9.5
ns min
3.3 V < VDD
≤ 3.6 V
7
ns min
VDD > 3.6 V
t8
6
36
ns max
SCLK Falling Edge to SDATA High Impedance
See Note 7
ns min
SCLK Falling Edge to SDATA High Impedance
tPOWER-UP
8
1
µs max
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.
2Mark/space ratio for the SCLK input is 40/60 to 60/40.
3Minimum f
SCLK at which specifications are guaranteed.
4Measured with the load circuit of Figure 1 and defined as the time required for the output to cross 0.8 V or 1.8 V when V
DD = 2.35 V and 0.8 V or 2.0 V for VDD > 2.35 V.
5Measured with 50 pF load capacitor.
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 i s then extrapolated
back to remove the effects of charging or discharging the 50 pF capacitor. This means that the time, t8, quoted in the timing characteristics is the true bus relinquish
time of the part and is independent of the bus loading.
7t
7 values also apply to t8 minimum values.
8See Power-Up Time section.
Specifications subject to change without notice.
TO OUTPUT
PIN
CL
50pF
200 A
IOH
200 A
IOL
1.6V
Figure 1. Load Circuit for Digital Output Timing Specifications


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