Analog Devices AD8330 User manual

AD8330 Evaluation Board
EVAL-AD8330EB
Rev. B
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Tel: [phone] www.analog.com
Fax: [phone] ©2006 Analog Devices, Inc. All rights reserved.
GENERAL DESCRIPTION
The EVAL-AD8330EB is an easy-to-use accessory that enables a
hands-on evaluation of the AD8330 variable gain amplifier
(VGA). It includes test pins for connections to all of the functional
device inputs. Figure 1 is a full size photograph of the board.
03721-009
Figure 1. Photograph of the AD8330 Evaluation Board
BASIC OPERATION
The input SMA connector IN is terminated with a 49.9 Ω
resistor (see Figure 2). For convenience, the board includes an
AD8131 high speed differential amplifier to convert a single-
ended signal source to the differential input of the AD8330. If
desired, the AD8131 can be removed and the AD8330 can be
driven at one of its inputs from a single-ended source.
The AD8330 output is observed at the SMA connectors OUT_HI
and OUT_LO or by using the 2-pin header OUT_HI/ OUT_LO
adjacent to the device.
The AD8330 requires only a +5 V power supply; however, because
of the AD8131 buffer bipolar power supply requirements, ±5 V
supplies are required to power the board. The current required
for the board is approximately 40 mA from the +5 V supply and
10 mA from the −5 V supply.
OPTIONS
Table 1 lists the jumpers on the board and their functions.
Consult the AD8330 data sheet for further explanation of their
functions.
8
7
2
3
9
W4
DOWN
C5
0.1μF
INLO
MODE
VPSI
INHI
VPSO
CMOP
OPLO
CNTR
OFST
OPHI
8
ENBL
VPOS
+5V
1
6
5
4
15
16
14
13
COMM
VMAG
VDBS
CMGN
12
11
10
C2
0.1μF
W3
UP
+5V
C3
0.1μF
+5V
IN
+5V
C7
0.1μF
CMGN1
VDBS
VMAG
C10
0.1μF
C4
0.1μF
+5V
C14
0.01μF
C15
0.1μF
V
CMD
ENB
AD8131
34
5
6
1
2
C16
0.01μF
–5V AGND
AGND
AGND
AGND
C12
0.1μF
R1
0Ω
R5
49.9Ω
R13
24.9Ω
OUT_HI
OUT_LO
W1
FLTR R12
1kΩ
OUT_HI/LO
IN_HI/LO
AD8330
C13
1nF
+
C1
10μF
10V
+
W2
OFST
C19
0.1μF
C11
0.1μF
C8
12pF
C9
12pF
C18
0.1μF
C20
0.1μF
C17
10μF
10V
C6
0.1μF
03721-001
Figure 2. Schematic Diagram

EVAL-AD8330EB
Rev. B | Page 2 of 4
Table 1. Functions of Jumpers
Name Function
W1 Connects a high-pass filter to the offset control loop
pin. This jumper is normally not installed.
W2 Disables the offset correction loop. This jumper is
installed for dc or low frequency operation.
W3 Mode up. Install for ascending gain with increasing
VDBS gain control voltage.
W4 Mode down. Install for descending gain with increasing
VDBS gain control voltage.
MEASUREMENT SETUP
The basic board connections for a typical measurement are
shown in Figure 3. To minimize circuit-loading effects, a low
capacitance FET probe is recommended for observing input or
output waveforms. Dual circuit headers IN_HI/LO and
OUT_HI/OUT_LO are provided for this purpose. The SMA
connectors OUT_HI and OUT_LO can also be used, but the
user may need to account for load capacitance effects.
EVAL-AD8330EB BOARD DESIGN
The EVAL-AD8330EB is a 4-layer design for maximum ground-
plane area. The evaluation board side silkscreen and wiring
patterns are shown in Figure 4 through Figure 9.
POWER SUPPLY
PRECISION VOLTAGE
REFERENCES
(FOR VDBS, VMAG)
NETWORK ANALYZER
DIFFERENTIAL
PROBE
GND
+5V
GND
SIGNAL
INPUT
03721-002
PROBE
POWER SUPPLY
03721-003
Figure 3. Typical Connections

EVAL-AD8330EB
Rev. B | Page 3 of 4
03721-003
Figure 4. Component-Side Silkscreen
03721-004
Figure 5. Component-Side Wiring
03721-005
Figure 6. Inner Layer 1
03721-006
Figure 7. Wiring-Side Silkscreen
03721-007
Figure 8. Wiring-Side Pattern
03721-008
Figure 9. Inner Layer 2

EVAL-AD8330EB
Rev. B | Page 4 of 4
Table 2. AD8330 Parts List
Pin No. Quantity Description Reference Designator
1 1 Resistor SM, 49.9 Ω, 1%, 1/16 W, 0603 R5
2 1 Resistor SM, 24.9 Ω, 1%, 1/8 W, 1206 R13
3 1 Resistor SM, 0 Ω, 5%, 1/8 W, 1206 R1
4 1 Resistor SM, 1 kΩ, 1%, 1/8 W, 1206 R12
5 11 Capacitor SM, 0.1 μF, 50 V, 1206 C2, C4, C6, C7, C10, C11, C12, C15, C18, C19, C20
6 2 Capacitor SM, 0.1 μF, 16 V, 0603 C3, C5
7 2 Capacitor SM tantalum, 10 μF, 10 V, A C1, C17
8 2 Capacitor SM, 10 nF, 50 V, 1206 C14, C16
9 2 Capacitor SM, 12 pF, 5%, NPO, 0603 C8, C9
10 1 Capacitor SM, 1 nF, 50 V, 5%, 1206 C13
11 7 Header, 2 pin CMGN1, IN_HI/LO, OUT_HI/ OUT_LO, W1, W2, W3, W4
12 3 Shunt CMGN1, W2, W3
13 1 IC, VGA, AD8330ARQ DUT
14 1 IC, differential amplifier, AD8131AR A1
15 3 Connector, SMA fem end launch In, out high, out low
16 10 Test point +5V, –5V, AGND1, AGND2, AGND3, 1GND4, ENBL,
VCMD, VDBS, VMAG
17 1 Board, PC, A00471C
18 4 Standoff aluminum round 4 to 40 × 1/2"
19 4 Pan head screw 4 to 40 × 1/4"
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
ORDERING GUIDE
Model Description
AD8330-EVAL Evaluation Board
©2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
C03721-0-3/06(B)
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