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AD7938BCP データシート(PDF) 7 Page - Analog Devices

部品番号 AD7938BCP
部品情報  8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
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AD7938BCP データシート(HTML) 7 Page - Analog Devices

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Preliminary Technical Data
AD7938/AD7939
TIMING SPECIFICATIONS1
VDD = VDRIVE =2.7 V to 5.25V, Internal/External VREF = 2.5 V, unless otherwise noted, FCLKIN = 24 MHz, FSAMPLE = 1.5 MSPS; TA = TMIN to
TMAX, unless otherwise noted.
Table 3.
Limit at TMIN, TMAX
Parameter
AD7938
AD7939
Unit
Description
fCLKIN2
10
10
kHz
min
24
24
MHz
max
tQUIET
10
10
ns min
Minimum time between end of Read and start of next conversion (i.e., time from when the
data bus goes into three-state until the next falling edge of CONVST)
t1
10
10
ns min
CONVST Pulse Width.
t2
20
20
ns min
CONVST Falling Edge to CLKIN Falling Edge Setup Time.
t3
TBD
TBD
ns min
CLKIN Falling Edge to BUSY Rising Edge.
t4
0
0
ns min
CS to WR Setup Time.
t5
0
0
ns min
CS to WR Hold Time.
t6
25
25
ns min
WR Pulse Width.
t7
10
10
ns min
Data Setup Time before WR.
t8
5
5
ns min
Data Hold after WR.
t9
0.5 tCLKIN
0.5 tCLKIN
ns min
New Data Valid before Falling Edge of BUSY.
t10
0
0
ns min
CS to RD Setup Time.
t11
0
0
ns min
CS to RD Hold Time.
t12
55
55
ns min
RD Pulse Width.
t133
50
50
ns max
Data Access Time after RD.
t144
5
5
ns min
Bus Relinquish Time after RD.
40
40
ns max
Bus Relinquish Time after RD.
t15
15
15
ns min
HBEN to RD Setup Time.
t16
5
5
ns min
HBEN to RD Hold Time.
t17
10
10
ns min
Minimum Time between Reads/Writes.
t18
0
0
ns min
HBEN to WR Setup Time.
t19
5
5
ns min
HBEN to WR Hold Time.
t20
TBD
TBD
ns max
CLKIN Falling Edge to BUSY Falling Edge.
1Sample tested during initial release to ensure compliance. All input signals are specified with tr = tf = 5 ns (10% to 90% of VDD) and timed from a voltage level of 1.6 V.
All timing specifications given above are with a 25 pF load capacitance (see
,
,
and
.
Figure 38 Figure 39 Figure 40
Figure 41
2 Mark/space ratio for CLKIN is 40/60 to 60/40.
3 The time required for the output to cross TBD.
4 t14 is derived from the measured time taken by the data outputs to change 0.5 V. The measured number is then extrapolated back to remove the effects of charging or
discharging the 25 pF capacitor. This means that the time, t14, quoted in the timing characteristics is the true bus relinquish time of the part and is independent of the
bus loading.
Rev. PrN | Page 7 of 32


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