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AD53020 bảng dữ liệu(PDF) 4 Page - Analog Devices

tên linh kiện AD53020
Giải thích chi tiết về linh kiện  Four Channel ECL Delay Line
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AD53020 bảng dữ liệu(HTML) 4 Page - Analog Devices

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AD53020
–4–
REV. A
A second bias current reference is employed to set the bias
current of the delay cells. This current is set by the external
resistor at REXT2. A 2.94 k
Ω resistor sets the nominal bias
current of 500
µA. The nominal voltage at the REXT2 pin
is –1.47 V.
The current references require compensation capacitors of
0.1
µF to V
EE at each of the COMP1 and COMP2 pins. In
addition, each VEE supply pin should also have its own decou-
pling capacitor of 0.1
µF to ground.
All decoupling capacitors should be located as close as possible
to the AD53020 chip.
The mode is set by the inputs S0 and S1. These pins use stan-
dard ECL levels, with the addition of a third level for the S1
Pin, which can also be connected to VEE. Refer to Table I for
the description of the modes and their respective settings.
For Modes 2 and 3, it is important to note that an internal flip-
flop is used to provide the independent control of rising and
falling edges. The state of this flip-flop is indeterminate upon
power-up. The state becomes fixed once the first full pulse is
provided to each channel, consisting of a positive edge followed
by a negative edge.
Table I. Truth Table for Mode Determination
Typical Independent Adjustment of
S1
S0
Mode
Span
Positive and Negative Edges?
0
0
0
19 ns
No
0
1
1
31 ns
No
1
0
2
19 ns
Yes
1
1
3
31 ns
Yes
VEE 0
Not Valid
VEE 1
5
45 ns
No
S0 and S1 accept logical ECL levels. In the case of S1 only, a third state is also
accepted, at the negative supply, VEE.
Table II. Package Thermal Characteristics
Air Flow, FM
JA, C/W
0
30.2
400
20.9
6
PIN 1
IDENTIFIER
7
40
39
17
18
29
28
TOP VIEW
(PINS DOWN)
0.695 (17.65)
0.685 (17.40)
SQ
0.656 (16.66)
0.650 (16.51)
SQ
0.048 (1.21)
0.042 (1.07)
0.048 (1.21)
0.042 (1.07)
0.020
(0.50)
R
0.021 (0.53)
0.013 (0.33)
0.050
(1.27)
BSC
0.63 (16.00)
0.59 (14.99)
0.032 (0.81)
0.026 (0.66)
0.180 (4.57)
0.165 (4.19)
0.040 (1.01)
0.025 (0.64)
0.025 (0.63)
0.015 (0.38)
0.110 (2.79)
0.085 (2.16)
0.056 (1.42)
0.042 (1.07)
44-Lead PLCC
(P-44A)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).


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