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AD8370 Datasheet(PDF) 21 Page - Analog Devices

Part # AD8370
Description  LF to 750 MHz Digitally Controlled VGA
PDF  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8370 Datasheet(HTML) 21 Page - Analog Devices

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AD8370
Rev. 0 | Page 21 of 28
EVALUATION BOARD AND SOFTWARE
The evaluation board allows quick testing of the AD8370 by
using standard 50 Ω test equipment. The schematic is shown in
Figure 57. Transformers T1 and T2 are used to transform 50 Ω
source and load impedances to the desired input and output
reference levels. The top and bottom layers are shown in
Figure 61 and Figure 62. The ground plane was removed under
the traces between T1 and pins INHI and INLO to approximate
a 100 Ω characteristic impedance.
The evaluation board comes with the AD8370 control software
that allows serial gain control from most computers. The
evaluation board is connected via a cable to the parallel port of
the computer. Simply by adjusting the slider bar in the control
software, the gain code is automatically updated to the AD8370.
310
12
49
8
7
611
5
2
13
1
15
22
24
16
21
20
19
18
23
17
14
25
D-SUB 25 PIN MALE
AD8370
67
8
23
5
1
11
10
9
15
14
16
13
12
4
23
5
14
C8
0.1
µF
OUT+
OUT–
IN+
IN–
C7
0.1
µF
C6
1
µF
C5
0.1
µF
+VS
VS
GND
GND
P2
VOCM
PWUP
C2
C1
T1
1:4
T2
2:1
R2
0
Ω
R1
0
Ω
R3
0
Ω
R4
0
Ω
C4
C10 OPEN
R8 49.9
Ω
R9
OPEN
SW1
C3
1nF
1nF
1nF
1nF
C9
OPEN
L2*
L1*
R7
1k
Ω
R6
1k
Ω
R5
1k
Ω
TC4-1W
50
Ω Tx LINE
50
Ω Tx LINE
50
Ω Tx LINE
50
Ω Tx LINE
JTX-2-10T
*EMI SUPPRESSION FERRITE
HZ1206E601R-00
Figure 57. AD8370 Evaluation Board Schematic



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