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AD7864 데이터시트(PDF) 4 Page - Analog Devices

부품명 AD7864
상세설명  4-Channel, Simultaneous Sampling, High Speed, 12-Bit ADC
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AD7864 데이터시트(HTML) 4 Page - Analog Devices

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AD7864
–4–
REV. A
TIMING CHARACTERISTICS1, 2
Parameter
A, B Versions
Units
Test Conditions/Comments
tCONV
1.65
µs max
Conversion Time, Internal Clock
13
Clock Cycles
Conversion Time, External Clock
2.6
µs max
CLKIN = 5 MHz
tACQ
0.34
µs max
Acquisition Time
tBUSY
No. of Channels
Selected Number of Channels Multiplied by
x (tCONV + t9) – t9
µs max
(tCONV + EOC Pulsewidth)—EOC Pulsewidth
tWAKE-UP—External VREF
2
µs max
STBY Rising Edge to CONVST Rising Edge
tWAKE-UP—Internal VREF
3
6ms max
STBY Rising Edge to CONVST Rising Edge
t1
35
ns min
CONVST Pulsewidth
t2
70
ns min
CONVST Rising Edge to BUSY Rising Edge
Read Operation
t3
0
ns min
CS to RD Setup Time
t4
0
ns min
CS to RD Hold Time
t5
35
ns min
Read Pulsewidth
t6
4
35
ns max
Data Access Time After Falling Edge of
RD, V
DRIVE = 5 V
40
ns max
Data Access Time After Falling Edge of
RD, V
DRIVE = 3 V
t7
5
5
ns min
Bus Relinquish Time After Rising Edge of
RD
30
ns max
t8
10
ns min
Time Between Consecutive Reads
t9
75
ns min
EOC Pulsewidth
180
ns max
t10
70
ns max
RD Rising Edge to FRSTDATA Edge (Rising or Falling)
t11
15
ns max
EOC Falling Edge to FRSTDATA Falling Delay
t12
0
ns min
EOC to RD Delay
Write Operation
t13
20
ns min
WR Pulsewidth
t14
0
ns min
CS to WR Setup Time
t15
0
ns min
WR to CS Hold Time
t16
5
ns min
Input Data Setup Time of Rising Edge of
WR
t17
5
ns min
Input Data Hold Time
NOTES
1Sample tested at +25
°C to ensure compliance. All input signals are measured with tr = tf = 1 ns (10% to 90% of +5 V) and timed from a voltage level of +1.6 V.
2See Figures 7, 8 and 9.
3Refer to the Standby Mode Operation section. The MAX specification of 6 ms is valid when using a 0.1
µF decoupling capacitor on the V
REF pin.
4Measured with the load circuit of Figure 2 and defined as the time required for an output to cross 0.8 V or 2.4 V.
5These times are derived from the measured time taken by the data outputs to change 0.5 V when loaded with the circuit of Figure 2. The measured number is then
extrapolated back to remove the effects of charging or discharging the 50 pF capacitor. This means that the times quoted in the timing characteristics are the true bus
relinquish times of the part and as such are independent of external bus loading capacitances.
Specifications subject to change without notice.
(VD = +5 V
5%, AGND = DGND = 0 V, VREF = Internal, Clock = Internal; all specifications
TMIN to TMAX unless otherwise noted.)
TO
OUTPUT
50pF
1.6V
400 A
1.6mA
Figure 1. Load Circuit for Access Time and Bus Relinquish Time


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