NSC LMH730316

National Semiconductor
Application Note 2095
Hooman Hashemi
November 1, 2010
General Description
Several components are mounted on the board bottom, while
the DUT is installed on the top layer, for best performance.
Here is a list of these components:
Rf, RGa, C4, and RGND.
For SOT23-6 devices with schematic pin 5 used for the disable function, resistor RTdis can be used (normally 50Ω)
while an input at J4 can act as a disable signal. For a SOT23-5
device, schematic pin 5 is non-existent and the said components are thus “don’t care”.
All board components are the SMT 0603 type, except the following listed in Table 1
The LMH730316 evaluation board is designed to aid in the
characterization of National Semiconductor’s high speed
and / or low distortion Operational Amplifiers and is sold without any components installed for easy application adoption.
This 4 layer board is designed to improve speed and reduce
harmonic distortion by careful placement and routing of components and traces.
Use the evaluation board as a guide for high frequency layout
and as a tool to aid in device testing and characterization.
Basic Operation
TABLE 1. Board Components which are not "0603" type
This evaluation board supports both inverting and non-inverting configurations. For component locations refer to the
schematic in Figure 1 . Note that the pin numbers correspond
to the SOT23-6 package. For the SOT23-5 package,
schematic pin 6 (VCC) is normally called pin 5 and schematic
pin 5 does not exist (open).
The board uses end mounted SMA connectors. On the +IN
input, resistor RINa provides input termination. The resistors
RTp and RINb are normally open and short, respectively, and
are included for added flexibility (e.g. filtering, divider / attenuation, etc.) in configuring the amplifier. When using the
evaluation board for non-inverting applications, load resistor
RGa only (RGb and RTn left open). The resistors RGb and
RTn are for use in the inverting configuration. When using this
board for inverting applications, do not load RGa; instead load
RGb and an appropriate value of RTn. Ro and RTo resistors
comprise the output connection network which is usually configured for 50Ω operation (Ro= 50Ω , RTo= open).
Reference Designator
Description
D1
Schottky diode,
1N5859, 40V (or
equivalent)
RGND
Shorting jumper
(single supply
operation only)
Diode D1 (optional) is meant as protection to clamp the supplies in case VCC and VEE are accidentally reversed. For
single-supply operation (VCC), short RGND to connect VEE
to GND and do not power VEE pins on J5. When using a single supply it is important to pay attention to DC bias voltages.
This board consists of four layers. All four layers are detailed
in Figure 2 through Figure 5.
LMH730316 SOT23-5 / SOT23-6 High Performance Amplifier Evaluation Board
LMH730316 SOT23-5 /
SOT23-6 High Performance
Amplifier Evaluation Board
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© 2010 National Semiconductor Corporation
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FIGURE 1. Evaluation Board Schematic
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FIGURE 2. Evaluation Board Top Layer
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FIGURE 3. Evaluation Board Bottom Layer (bottom view)
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FIGURE 4. Evaluation Board Layer 2 (bottom view)
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FIGURE 5. Evaluation Board Layer 3 (bottom view)
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LMH730316 SOT23-5 / SOT23-6 High Performance Amplifier Evaluation Board
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