Analog Devices AD8332 Evaluation Board AD8332-EVALZ AD8332-EVALZ Data Sheet
Product codes
AD8332-EVALZ
Dual VGA, Ultralow Noise Preamplifier, and
Programmable R
IN
Evaluation Board
AD8332-EVALZ
Rev. D
Evaluation boards are only intended for device evaluation and not for production purposes.
Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or
statutory including, but not limited to, any implied warranty of merchantability or fitness for a
particular purpose. No license is granted by implication or otherwise under any patents or other
intellectual property by application or use of evaluation boards. Information furnished by Analog
Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result
from its use. Analog Devices reserves the right to change devices or specifications at any time
without notice. Trademarks and registered trademarks are the property of their respective owners.
Evaluation boards are not authorized to be used in life support devices or systems.
Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or
statutory including, but not limited to, any implied warranty of merchantability or fitness for a
particular purpose. No license is granted by implication or otherwise under any patents or other
intellectual property by application or use of evaluation boards. Information furnished by Analog
Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result
from its use. Analog Devices reserves the right to change devices or specifications at any time
without notice. Trademarks and registered trademarks are the property of their respective owners.
Evaluation boards are not authorized to be used in life support devices or systems.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2003–2007 Analog Devices, Inc. All rights reserved.
GENERAL DESCRIPTION
variable gain amplifier (VGA). The board is shipped
assembled and tested, and users only need to connect the signal
and VGAIN sources to a single 5 V power supply. Figure 1 is a
photograph of the component side of the board, and Figure 2 is
the schematic.
and VGAIN sources to a single 5 V power supply. Figure 1 is a
photograph of the component side of the board, and Figure 2 is
the schematic.
03
63
5-
0
01
Figure 1. AD8332-EVALZ Photo of Component Side
USER-SUPPLIED OPTIONAL COMPONENTS
The board is built and tested using the components shown in
black in Figure 2. Provisions are made for optional components
(shown in gray) that can be installed for testing at the user’s
discretion. The default LNA input impedance is 50 Ω to match
various signal generators and network analyzers. Input impedances
up to 6 kΩ are realized by changing values of RFBx and CSHx.
Consult the
black in Figure 2. Provisions are made for optional components
(shown in gray) that can be installed for testing at the user’s
discretion. The default LNA input impedance is 50 Ω to match
various signal generators and network analyzers. Input impedances
up to 6 kΩ are realized by changing values of RFBx and CSHx.
Consult the
data sheet for more details on this circuit
feature.
For reference, Table 1 lists the common input impedance values
and corresponding adjustments. The board is designed for
0603-size, surface-mount components.
and corresponding adjustments. The board is designed for
0603-size, surface-mount components.
Table 1. LNA External Component Values for Common
Source Impedances
Source Impedances
R
IN
(Ω)
RFBx (Ω, Std 1% Value)
CSHx (pF)
50 274
22
75 412
12
100 562
8
200 1.13
k
1.2
500 3.01
k
None
6 k
∞
None
SMA connectors, S2, S3, S6, and S7, are provided for access to
the LNA outputs or the VGA inputs. If the LNA is used alone,
0.1 μF coupling capacitors can be installed at locations C5, C9,
C23, and C24. Resistors of 68 Ω to 100 Ω can be required if the
load capacitances, as seen by the LNA outputs, are larger than
approximately 10 pF.
the LNA outputs or the VGA inputs. If the LNA is used alone,
0.1 μF coupling capacitors can be installed at locations C5, C9,
C23, and C24. Resistors of 68 Ω to 100 Ω can be required if the
load capacitances, as seen by the LNA outputs, are larger than
approximately 10 pF.
A resistor can be inserted at RCLMP if output clamping
is desired. The peak-to-peak clamping level is adjusted by
installing one of the standard 1% resistor values listed in the
is desired. The peak-to-peak clamping level is adjusted by
installing one of the standard 1% resistor values listed in the
data sheet.
A high frequency differential probe connected to the 2-pin
headers VOx is the preferred method to observe a waveform
at the VGA output. A typical setup is shown in Figure 3. Single-
ended loads can be connected directly via the board edge SMA
connectors. Note that the
headers VOx is the preferred method to observe a waveform
at the VGA output. A typical setup is shown in Figure 3. Single-
ended loads can be connected directly via the board edge SMA
connectors. Note that the
output amplifier is buffered with
237 Ω resistors; therefore, be sure to compensate for attenuation if
low impedances are connected to the output SMAs.
low impedances are connected to the output SMAs.
MEASUREMENT SETUP
The basic board connections for measuring bandwidth are
shown in Figure 3. A 5 V, 100 mA (minimum) power supply is
required, and a low noise voltage reference supply is required
for VGAIN.
shown in Figure 3. A 5 V, 100 mA (minimum) power supply is
required, and a low noise voltage reference supply is required
for VGAIN.