Datasheet
AD8337-EVAL
Rev. 0 | Page 3 of 8
GENERAL DESCRIPTION
The AD8337-EVAL provides a platform for test and evaluation
of the
AD8337 VGA. Three circuit configurations are available:
• Direct coupled, with noninverting gain and dual-power supplies
• Direct coupled, with inverting gain and dual supplies
• AC-coupled, with noninverting gain configuration and a
single-supply
These fully assembled and tested boards are ready to go. The
user only needs to make the appropriate connections from a
power supply and signal source. SMA connectors are provided
for the preamplifier (PrA) and VGA outputs. Photos of fully
assembled boards are shown in
Figure 1 and Figure 2, and
Figure 3 and Figure 4 show the board component side layouts.
+–
05935-003
Figure 3. Assembly, Dual-Supply Evaluation Board
0
5935-004
Figure 4. Assembly, Single-Supply Evaluation Board
Schematic diagrams of the dual-supply board for noninverting
and inverting configurations are shown in
Figure 5 and Figure 6.
The dual-supply boards require ±2.5 V to ±5 V supplies capable of
supplying 20 mA or greater. A schematic diagram of the single-
supply board is shown in
Figure 7. The single supply version
accepts a +5 V to +10 V supply with 20 mA or greater capability.
IN
1
8
7
6
54
3
2
VOUT
VCOM
INPP
VPOS
GAIN
VNEG
PRAOINPN
U1
AD8337
TP1
VOUT
GND1 GND2GND GND3 GND4
R2
49.9Ω
RVO1
453Ω
RFB2
100Ω
RFB1
100Ω
R4
0Ω
RPO2
453Ω
PRAO
R1
49.9Ω
GAIN
RVO3
0Ω
L1
120nH
L2
120nH
J1
DO NOT INSTALL PARTS IN GRAY
C4
0.1µF
+
CG
1nF
R5
100Ω
C3
0.1µF
C1
10µF
C2
10µF
+
V
S
–V
S
+
05935-005
Figure 5. Evaluation Board Schematic—Noninverting Configuration
IN
1
8
7
6
54
3
2
VOUT
VCOM
INPP
VPOS
GAIN
VNEG
PRAOINPN
TP1
VOUT
R2
49.9Ω
RVO1
453Ω
RFB2
100Ω
RFB1
100Ω
R4
0Ω
RPO2
453Ω
PRAO
R1
49.9Ω
GAIN
RVO3
0Ω
L1
120nH
L2
120nH
J1
DO NOT INSTALL PARTS IN GRAY
C4
0.1µF
+
CG
1nF
R5
100Ω
100Ω
C3
0.1µF
C1
10µF
C2
10µF
+V
S
–
V
S
+
05935-006
U1
AD8337
GND1 GND2GND GND3 GND4
Figure 6. Evaluation Board Schematic—Inverting Configuration