Datasheet

AD8370 Data Sheet
Rev. B | Page 22 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 59. 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 63 and Figure 64. 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. Adjusting the appropriate slider bar in the control
software automatically updates the gain code of the AD8370 in
either a linear or linear-in-dB fashion.
3 10 124 9876 1152 131
15 22 2416 21201918 231714 25
D-SUB 25 PIN MALE
AD8370
INHI ICOM VCCI PWUP VOCM VCCO OCOM OPHI
OPLO
OCOM
VCCO
LTCH
CLCK DATA
ICOM
INLO
6 7 82 3 51
11 10 915 1416 13 12
4
2 3 51 4
C8
0.1µF
OUT+
OUT–
IN+
IN–
C7
0.1µF
C6
1µF
C5
0.1µF
+V
S
V
S
GND
GND
P2
VOCM
PWUP
C2
C1
T1
1:4
T2
2:1
R2
0Ω
R1
0Ω
R3
0Ω
R4
0Ω
C4
C10 OPEN
R8 49.9Ω
R9
OPEN
SW1
C3
1nF
1nF
1nF
1nF
C9 OPEN
L2*
L1*
R7
1kΩ
R6
1kΩ
R5
1kΩ
03692-057
TC4-1W
50Ω Tx LINE
50Ω Tx LINE
50Ω Tx LINE
50Ω Tx LINE
JTX-2-10T
*EMI SUPPRESSION FERRITE
HZ1206E601R-00
Figure 59. AD8370 Evaluation Board Schematic