AD7878KP 查看數據表（PDF） - Analog Devices
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AD7878KP Datasheet PDF : 16 Pages
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AD7878
TIMING CHARACTERISTICS1 (VDD = 5 V ؎ 5%, VCC = 5 V ؎ 5%, VSS = –5 V ؎ 5%)
Limit at TMIN, TMAX Limit at TMIN, TMAX Limit at TMIN, TMAX
Parameter (L Grade)
(J, K, A, B Grades) (S Grade)
Units Conditions/Comments
tl
t2
t3
t4
t5
t6
t7
t8
t92
t103
t11
t12
t13
t142
tRESET
65
65
2 CLK IN Cycles
0
0
45
50
16
0
41
5
45
42
50
20
10
41
2 CLK IN Cycles
65
65
2 CLK IN Cycles
0
0
60
50
16
0
57
5
45
42
50
20
10
57
2 CLK IN Cycles
75
75
2 CLK IN Cycles
0
0
60
50
16
0
57
5
45
55
50
30
10
57
2 CLK IN Cycles
ns max
ns max
min
ns min
ns min
ns min
µs max
ns min
ns min
ns min
ns min
ns max
ns min
µs max
ns min
ns min
ns min
min
CLK IN to BUSY Low Propagation Delay
CLK IN to BUSY High Propagation Delay
CONVST Pulse Width
CS to DMRD/REGISTER ENABLE Setup Time
CS to DMRD/ REGISTER ENABLE Hold Time
DMRD Pulse Width
ADD0 to DMRD/REGISTER ENABLE Setup Time
ADD0 to DMRD/REGISTER ENABLE Hold Time
Data Access Time after DMRD
Bus Relinquish Time
REGISTER ENABLE Pulse Width
Data Valid to REGISTER ENABLE Setup Time
Data Hold Time after REGISTER ENABLE
Data Access Time after BUSY
RESET Pulse Width
NOTES
1Timing Specifications in bold print are 100% production tested. All other times are sample tested at +25 °C to ensure compliance. All input signals are specified with
tr = tf = 5 ns (10% to 90% of 5 V) and timed from a voltage level of 1.6 V.
2t9 and t14 are measured with the load circuits of Figure 1 and defined as the time required for an output to cross 0.8 V or 2.4 V.
3t10 is defined as the time required for the data lines to change 0.5 V when loaded with the circuits of Figure 2.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS*
(TA = +25°C unless otherwise stated)
a. High-Z to VOH
b. High-Z to VOL
Figure 1. Load Circuits for Access Time
a. VOH to High-Z
b. VOL to High-Z
Figure 2. Load Circuits for Output Float Delay
VDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
VCC to DGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
VSS to DGND . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to –7 V
VDD to VCC . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +0.3 V
AGND to DGND . . . . . . . . . . . . . . . . . –0.3 V to VDD +0.3 V
VIN to AGND . . . . . . . . . . . . . . . . . . . . . . . . . –15 V to +15 V
REF OUT to AGND . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VDD
Digital Inputs to DGND
CLK IN, DMWR, DMRD, RESET,
CS, CONVST, ADD0 . . . . . . . . . . . . –0.3 V to VDD +0.3 V
Digital Outputs to DGND
ALFL, BUSY . . . . . . . . . . . . . . . . . . –0.3 V to VDD +0.3 V
Data Pins
DB11–DB0 . . . . . . . . . . . . . . . . . . . . –0.3 V to VDD +0.3 V
Operating Temperature Range
J, K, L Versions . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
A, B Versions . . . . . . . . . . . . . . . . . . . . . . . –25°C to +85°C
S Version . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . +300°C
Power Dissipation (Any Package) to +75°C . . . . . . 1000 mW
Derates above +75°C by . . . . . . . . . . . . . . . . . . 10 mW/°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. These are stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD7878 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. A
–3–
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