AD7870BQ 데이터 시트보기 (PDF) - Analog Devices
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AD7870BQ Datasheet PDF : 20 Pages
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AD7870/AD7875/AD7876
TIMING CHARACTERISTICS1, 2 (VDD = +5 V ؎ 5%, VSS = –5 V ؎ 5%, AGND = DGND = 0 V. See Figures 9, 10, 11 and 12.)
Parameter
Limit at TMIN, TMAX
(J, K, L, A, B, C Versions)
Limit at TMIN, TMAX
(S, T Versions)
Units
Conditions/Comments
t1
50
t2
0
t3
60
t4
0
t5
70
t63
57
t74
5
50
t8
0
t9
0
t10
100
t115
370
t126
135
t13
20
100
t14
10
100
t15
60
t16
120
t17
200
t18
0
t19
0
t20
0
50
ns min CONVST Pulse Width
0
ns min CS to RD Setup Time (Mode 1)
75
ns min RD Pulse Width
0
ns min CS to RD Hold Time (Mode 1)
70
ns max RD to INT Delay
70
ns max Data Access Time after RD
5
ns min Bus Relinquish Time after RD
50
ns max
0
ns min HBEN to RD Setup Time
0
ns min HBEN to RD Hold Time
100
ns min SSTRB to SCLK Falling Edge Setup Time
370
ns min SCLK Cycle Time
150
ns max SCLK to Valid Data Delay. CL = 35 pF
20
ns min SCLK Rising Edge to SSTRB
100
ns max
10
ns min Bus Relinquish Time after SCLK
100
ns max
60
ns min CS to RD Setup Time (Mode 2)
120
ns max CS to BUSY Propagation Delay
200
ns min Data Setup Time Prior to BUSY
0
ns min CS to RD Hold Time (Mode 2)
0
ns min HBEN to CS Setup Time
0
ns min HBEN to CS Hold Time
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.
2Serial timing is measured with a 4.7 kΩ pull-up resistor on SDATA and SSTRB and a 2 kΩ pull-up on SCLK. The capacitance on all three outputs is 35 pF.
3t6 is 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.
4t7 is defined as the time required for the data lines to change 0.5 V when loaded with the circuits of Figure 2.
5SCLK mark/space ratio (measured from a voltage level of 1.6 V) is 40/60 to 60/40.
6SDATA will drive higher capacitive loads but this will add to t12 since it increases the external RC time constant (4.7 kΩʈCL) and hence the time to reach 2.4 V.
Specifications subject to chance without notice.
ABSOLUTE MAXIMUM RATINGS*
VDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
VSS to AGND . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to –7 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 V to VDD
Digital Inputs to DGND . . . . . . . . . . . . –0.3 V to VDD +0.3 V
Digital Outputs to DGND . . . . . . . . . . . –0.3 V to VDD +0.3 V
Operating Temperature Range
Commercial (J, K, L Versions – AD7870) . . . 0°C to +70°C
Commercial (K, L Versions – AD7875) . . . . . 0°C to +70°C
Industrial (A, B, C Versions – AD7870) . . . .–25°C to +85°C
Industrial (B, C Versions – AD7875/AD7876)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Extended (S, T Versions) . . . . . . . . . . . . . . –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 . . . . . . . . . 450 mW
Derates above +75°C by . . . . . . . . . . . . . . . . . . . . . 10 mW/°C
*Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only; functional
operation of the device at these or any other conditions above those listed in
the operational sections of this specification is not implied. Exposure
to absolute maximum rating conditions for extended periods may affect
device reliability.
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
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 AD7870/AD7875/AD7876 feature 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
–4–
REV. B
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