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December 4, 2008
LMH730227/LMH730216/LMH730165
Single High Speed Op Amp Evaluation Boards (SOIC,
SOT-23, and SC-70)
The LMH730227, LMH730216 and LMH730165 evaluation
boards are designed to aid in the characterization of National
Semiconductor's High Speed monolithic amplifiers.
•
LMH730227 — SOIC packages
•
LMH730216 — SOT-23 packages
•
LMH730165 — SC-70 packges
Use the evaluation boards as a guide for high frequency lay-
out and as a tool to aid in device testing and characterization.
The evaluation boards accommodate general purpose am-
plifiers, as well as amplifiers with the following features:
•
Supply current adjustment via external Resistor
•
Output disable
The evaluation board schematic is shown below. Refer to the
product data sheets for recommendations for component val-
ues.
BASIC OPERATION
These boards have identical circuit configurations and are
designed to accommodate both non-inverting and inverting
operation. By changing RT or RIN and ROUT different input
and output impedances can be matched. The SMA connec-
tors and board traces are optimized for 50Ω operation, how-
ever other impedances can be matched as shown below.
Inverting Gain = R
F
/R
G
(Input Resistance = R
T
|| R
G
)
Non Inverting Gain = 1 + R
F
/(R
G
+ R
T
)
(Input Resistance = R
IN
)
(R
T
may be set to zero for non inverting operation)
For current feedback operational amplifiers be careful to use
appropriate values of R
F
. In addition the required value of
R
G
will limit choices for input impedance with Inverting gains.
20066601
FIGURE 1. SOT-23 and SC-70 Schematic
© 2008 National Semiconductor Corporation 200666 www.national.com
LMH730227/LMH730216/ LMH730165 Single High Speed Op Amp Evaluation Boards (SOIC,
SOT-23 and SC-70)
Verzeichnis
- ・ Blockdiagramm on Seite 1 Seite 2
- ・ Anwendungsbereich on Seite 7
