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ADCS7477AIMF 数据表(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 ADCS7477AIMF
功能描述  1MSPS, 12-/10-/8-Bit A/D Converters in 6-Lead SOT-23
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

ADCS7477AIMF 数据表(HTML) 9 Page - National Semiconductor (TI)

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Timing Test Circuit
20057708
ADCS7476/ADCS7477/ADCS7478 Timing Specifications
The following specifications apply for V
DD = +2.7V to 5.25V, fSCLK = 20 MHz, Boldface limits apply for TA = −40˚C to +85˚C:
all other limits T
A = 25˚C, unless otherwise noted. (Note 9)
Symbol
Parameter
Conditions
Typical
Limits
Units
t
CONVERT
16xt
SCLK
t
QUIET
(Note 5)
50
ns (min)
t
1
Minimum CS Pulse Width
10
ns (min)
t
2
CS to SCLK Setup Time
10
ns (min)
t
3
Delay from CS Until SDATA
TRI-STATE® Disabled (Note 6)
20
ns (max)
t
4
Data Access Time after SCLK Falling
Edge(Note 7)
V
DD = +2.7 to +3.6
40
ns (max)
V
DD = +4.75 to +5.25
20
ns (max)
t
5
SCLK Low Pulse Width
0.4 x
t
SCLK
ns (min)
t
6
SCLK High Pulse Width
0.4 x
t
SCLK
ns (min)
t
7
SCLK to Data Valid Hold Time
V
DD = +2.7 to +3.6
7
ns (min)
V
DD = +4.75 to +5.25
5
ns (min)
t
8
SCLK Falling Edge to SDATA High
Impedance (Note 8)
V
DD = +2.7 to +3.6
25
ns (max)
6
ns (min)
V
DD = +4.75 to +5.25
25
ns (max)
5
ns (min)
t
POWER-UP
Power-Up Time from Full
Power-Down
1µs
Note 5: Minimum Quiet Time Required Between Bus Relinquish and Start of Next Conversion
Note 6: Measured with the load circuit shown above, and defined as the time taken by the output to cross 1.0V.
Note 7: Measured with the load circuit shown above, and defined as the time taken by the output to cross 1.0V or 2.0V.
Note 8: t8 is derived from the time taken by the outputs to change by 0.5V with the loading circuit shown above. The measured number is then adjusted to remove
the effects of charging or discharging the 25pF capacitor. This means t8 is the true bus relinquish time, independent of the bus loading.
Note 9: All input signals are specified as tr =tf = 5 ns (10% to 90% VDD) and timed from 1.6V.
www.national.com
9


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