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參數(shù)資料
型號: AD7890AR-10
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: Side Entry Connector Hood; Enclosure Material:Aluminum Alloy; For Use With:C146 Rectangular Circular Connectors; Connecting Termination:Screw; Gender:Male; No. of Contacts:48; Operating Voltage:400V; Series:C-146 RoHS Compliant: Yes
中文描述: 8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO24
封裝: MS-013AD, SOIC-24
文件頁數(shù): 4/20頁
文件大?。?/td> 302K
代理商: AD7890AR-10
AD7890
–4–
REV. A
TIMNGCHARACTERISTICS
1, 2
Limit at T
MIN
, T
MAX
(A, B, S Versions)
Parameter
Units
Conditions/Comments
f
CLK IN3
100
2.5
0.3
×
t
CLK IN
0 3
×
t
CLK IN
25
25
5.9
100
kHz min
MHz max
ns min
ns min
ns max
ns max
μ
s max
ns min
Master Clock Frequency. For Specified Performance
t
CLK IN LO
t
C4
tr
tf
4
t
CONVERT
t
CST
Self-Clocking Mode
t
1
t
25
t
3
t
4
t
55
t
6
t
76
t
8
Master Clock Input Low T ime
Master Clock Input High T ime
Digital Output Rise T ime. T ypically 10 ns
Digital Output Fall T ime. T ypically 10 ns
Conversion T ime
CONVST
Pulse Width
t
CLK IN HI
+ 50
25
t
CLK IN HI
t
CLK IN LO
20
40
50
0
t
CLK IN
+ 50
0
20
10
20
ns max
ns max
ns nom
ns nom
ns max
ns max
ns max
ns min
ns max
ns min
ns min
ns min
ns min
RFS
Low to SCLK Falling Edge
RFS
Low to Data Valid Delay
SCLK High Pulse Width
SCLK Low Pulse Width
SCLK Rising Edge to Data Valid Delay
SCLK Rising Edge to
RFS
Delay
Bus Relinquish T ime after Rising Edge of SCLK
TFS
Low to SCLK Falling Edge
t
9
t
10
t
11
t
12
Data Valid to
TFS
Falling Edge Setup T ime (A2 Address Bit)
Data Valid to SCLK Falling Edge Setup T ime
Data Valid to SCLK Falling Edge Hold T ime
TFS
to SCLK Falling Edge Hold T ime
External-Clocking Mode
t
13
t
145
t
15
t
16
t
175
t
18
t
196
t
19A6
t
20
t
21
t
22
t
23
20
40
50
50
35
20
50
90
20
10
15
40
ns min
ns max
ns min
ns min
ns max
ns min
ns max
ns max
ns min
ns min
ns min
ns min
RFS
Low to SCLK Falling Edge Setup T ime
RFS
Low to Data Valid Delay
SCLK High Pulse Width
SCLK Low Pulse Width
SCLK Rising Edge to Data Valid Delay
RFS
to SCLK Falling Edge Hold T ime
Bus Relinquish T ime after Rising Edge of
RFS
Bus Relinquish T ime after Rising Edge of SCLK
TFS
Low to SCLK Falling Edge Setup T ime
Data Valid to SCLK Falling Edge Setup T ime
Data Valid to SCLK Falling Edge Hold T ime
TFS
to SCLK Falling Edge Hold T ime
NOT ES
1
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.
2
See Figures 8 to 11.
3
T he AD7890 is production tested with f
at 2.5 MHz. It is guaranteed by characterization to operate at 100 kHz.
4
Specified using 10% and 90% points on waveform of interest.
5
T hese numbers are measured with the load circuit of Figure I and defined as the time required for the output to cross 0.8 V or 2.4 V.
6
T hese numbers are derived from the measured time taken by the data output to change 0.5 V when loaded with the circuit of Figure 1. T he measured number is then
extrapolated back to remove effects of charging or discharging the 50 pF capacitor. T his means that the times quoted in the timing characteristics are the true bus re-
linquish times of the part and as such are independent of external bus loading capacitances.
50pF
TO OUTPUT
PIN
200μA
1.6mA
+2.1V
Figure 1. Load Circuit for Access Time and Bus Relinquish Time
(V
DD
= +5 V
6
5%, AGND = DGND = 0 V, REF IN= +2.5 V, f
CLK IN
= 2.5 MHz external, MUX OUT
connected to SHA IN)
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