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AD7920AKS-REEL Datasheet(PDF) 4 Page - Analog Devices

Part # AD7920AKS-REEL
Description  250 kSPS, 10-/12-Bit ADCs in 6-Lead SC70
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7920AKS-REEL Datasheet(HTML) 4 Page - Analog Devices

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REV. B
–4–
AD7910/AD7920
AD7910/AD7920
Parameter
Limit at TMIN, TMAX
Unit
Description
fSCLK
2
10
kHz min
3
5
MHz max
tCONVERT
14
tSCLK
AD7910
16
tSCLK
AD7920
tQUIET
50
ns minMinimum Quiet Time Required between Bus Relinquish and
Start of Next Conversion
t1
10
ns min
Minimum
CS Pulse Width
t2
10
ns min
CS to SCLK Setup Time
t3
4
22
ns max
Delay from
CS until SDATA Three-State Disabled
t4
4
40
ns max
Data Access Time after SCLK Falling Edge
t5
0.4
tSCLK
ns min
SCLK Low Pulse Width
t6
0.4
tSCLK
ns min
SCLK High Pulse Width
t7
5
SCLK to Data Valid Hold Time
10
ns min
VDD
£ 3.3 V
9.5
ns min
3.3 V < VDD
£ 3.6 V
7
ns min
VDD > 3.6 V
t8
6
36
ns max
SCLK Falling Edge to SDATA Three-State
See Note 7
ns min
SCLK Falling Edge to SDATA Three-State
tPOWER-UP
8
1
ms max
Power-Up Time from Full Power-Down
NOTES
1Guaranteed by characterization. All input signals are specified with tr = tf = 5 ns (10% to 90% of V
DD) and timed from a voltage level of 1.6 V.
2Mark/Space ratio for the SCLK input is 40/60 to 60/40.
3Minimum f
SCLK at which specifications are guaranteed.
4Measured with the load circuit of Figure 1 and defined as the time required for the output to cross 0.8 V or 1.8 V when V
DD = 2.35 V and 0.8 V or 2.0 V for VDD > 2.35 V.
5Measured with a 50 pF load capacitor.
6t
8 is derived from the measured time taken by the data outputs to change 0.5 V when loaded with the circuit of Figure 1. The measured number is then extrapolated
back to remove the effects of charging or discharging the 50 pF capacitor. This means that the time, t8, quoted in the Timing Characteristics is the true bus relinquish
time of the part and is independent of the bus loading.
7t
7 values apply to t8 minimum values also.
8See Power-Up Time section.
Specifications subject to change without notice.
AD7920–SPECIFICATIONS1 (continued)
Parameter
A Grade
1, 2
B Grade
1, 2
Unit
Test Conditions/Comments
POWER REQUIREMENTS
VDD
2.35/5.25
2.35/5.25
V min/max
IDD
Digital I/Ps = 0 V or VDD
Normal Mode (Static)
2.5
2.5
mA typ
VDD = 4.75 V to 5.25 V, SCLK On or Off
1.2
1.2
mA typ
VDD = 2.35 V to 3.6 V, SCLK On or Off
Normal Mode (Operational)
3
3
mA max
VDD = 4.75 V to 5.25 V, fSAMPLE = 250 kSPS
1.4
1.4
mA max
VDD = 2.35 V to 3.6 V, fSAMPLE = 250 kSPS
Full Power-Down Mode
1
1
mA max
Typically 50 nA
Power Dissipation
7
Normal Mode (Operational)
15
15
mW max
VDD = 5 V, fSAMPLE = 250 kSPS
4.2
4.2
mW max
VDD = 3 V, fSAMPLE = 250 kSPS
Full Power-Down
5
5
mW max
VDD = 5 V
33
mW max
VDD = 3 V
NOTES
1Temperature range from –40
∞C to +85∞C.
2Operational from V
DD = 2.0 V, with input low voltage (VINL) 0.35 V max.
3See Terminology section.
4B Grade, maximum specs apply as typical figures when V
DD = 4.75 V to 5.25 V.
5SC70 values guaranteed by characterization.
6Guaranteed by characterization.
7See Power vs. Throughput Rate section.
Specifications subject to change without notice.
TIMING SPECIFICATIONS1 (V
DD = 2.35 V to 5.25 V, TA = TMIN to TMAX, unless otherwise noted.)


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