AD8336-EVALZ Analog Devices Inc, AD8336-EVALZ Datasheet - Page 24

• Manufacturer Part Number: AD8336-EVALZ
• Description: BOARD EVALUATION FOR AD8336
• Manufacturer: Analog Devices Inc
• Series: X-AMP®r

Specifications of AD8336-EVALZ

• Channels Per Ic: 1 - Single
• Amplifier Type: Variable Gain
• Output Type: Single-Ended
• Slew Rate: 550 V/µs
• -3db Bandwidth: 115MHz
• Current - Output / Channel: 20mA
• Operating Temperature: -55°C ~ 125°C
• Current - Supply (main Ic): 28mA
• Voltage - Supply, Single/dual (±): ±3 V ~ 12 V
• Board Type: Fully Populated
• Utilized Ic / Part: AD8336
• Silicon Manufacturer: Analog Devices
• Application Sub Type: Variable Gain Amplifier
• Kit Application Type: Amplifier
• Silicon Core Number: AD8336
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD8336
EVALUATION BOARD
An evaluation board, AD8336-EVALZ, is available online for
the AD8336. Figure 82 is a photo of the board.
The board is shipped from the factory configured for a preamp
gain of 4×. To change the value of the gain of the preamp or to
change the gain polarity to inverting, alter the component values
or install components in the alternate locations provided. All
components are standard 0603 size, and the board is designed for
RoHS compliancy. Figure 83 shows the locations of components
provided for changing the amplifier configuration to inverting
gain. Simply install the components shown in red and remove
those shown in gray.
OPTIONAL CIRCUITRY
The AD8336 features differential inputs for the gain control,
permitting nonzero or floating gain control inputs. To avoid any
delay in making the board operational, the gain input circuit is
Figure 82. AD8336 Evaluation Board
shipped with Pin GNEG connected to ground via a 0 Ω resistor
in the R17 location. The user can adjust the gain of the device
by driving the GPOS test loop with a power supply or voltage
reference. Resistor networks are provided for fixed-gain bias
voltages at Pin GNEG and Pin GPOS for common-mode voltages
other than 0 V. If it is desired to drive the gain control with an
active input such as a ramp, SMA connectors can be installed in
the locations GAIN− and GAIN+. Provision is made for an
optional SMA connector at PRVG for monitoring the preamp
output or for driving the VGA from an external source. Remove
the 0 Ω resistor at R9 to isolate the preamp from an external
generator.
BOARD LAYOUT CONSIDERATIONS
The evaluation board uses four layers, with power and ground
planes located between two conductor layers. This arrangement
is highly recommended for customers, and several views of the
board are provided as reference for board layout details. When
laying out a printed circuit board for the AD8336, remember to
provide a pad beneath the device to solder the exposed pad of
the matching device. The pad in the board should have at least
five vias to provide a thermal path for the chip scale package.
Unlike leaded devices, the thermal pad is the primary means to
Figure 83. Components for Inverting Gain Operation
remove heat dissipated within the device.
Table 6 is a bill of materials for the evaluation board.
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