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 2001 National Semiconductor Corporation www.national.com

8-pin Thermally Enhanced SOIC (PSOP)

Dual Op Amp Evaluation Board

Part Number CLC730121

June 2001

The CLC730121 evaluation board is designed to aid in the characterization of National’s 8-pin Dual Op Amps in PSOP

package. This board uses all surface-mount components for maximum speed and performance.

Figure 1 shows the schematic:

Figure 1: Complete Evaluation Board Schematic

This board is designed with versatility in mind; that is, by selective insertion of components, the device can be put into an

Inverting, non-inverting, or differential configuration. In addition, single supply operation can be tested with simple board

modifications (please see below).

Please note that R11 is installed on the circuit side of the board in order to minimize its lead lengths. C5-8 (4 places) are

de-coupling caps essential to be installed for good high frequency behavior. 0.1µF and 6.8µF are good values in most

cases. Note that C7-8 are polar caps. Use Tantalum capacitors for lowest ESR.

The CLC730121 evaluation board uses a thermally dissipating pad soldered to the exposed die attach paddle (DAP) of

the device under test (DUT) to enable heat transfer out of the package. Normally this DAP would be soldered during

manufacturing with a process like vapor phase. For lab evaluation, use a thermally conductive epoxy or thermal grease

between the DAP and the board to help conduct heat out of the package.

SINGLE SUPPLY OPERATION:

In order to allow maximum flexibility, it is possible to test the Op Amp in a single supply arrangement as well. To do so,

R16, R17, and C9 can be installed to form a “virtual ground” which would be tied to the non-inverting terminal as biasing.

A convenient way to connect C9 (positive side) to the inputs is by performing the following:

1. Cut R7 and R10 connection to ground plane, on circuit side.

2. Install 0Ω resistances for R7 and R10

3. Tie C9 (positive side) to the cut side of R7 and R10.

Summary of content (5 pages)

PAGE 1
8-pin Thermally Enhanced SOIC (PSOP) Dual Op Amp Evaluation Board . Part Number CLC730121 June 2001 The CLC730121 evaluation board is designed to aid in the characterization of National’s 8-pin Dual Op Amps in PSOP package. This board uses all surface-mount components for maximum speed and performance.
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DAP Connection: CLC730121 evaluation board can be used with two types of Op Amps: 1. Op Amp’s with DAP internally floating. (no board change required) 2. Op Amp’s with DAP internally tied to V- (see below for modifications needed to the board) CLC730121 DAP heatsink connection is tied to ground. With “type 2” devices listed above, it will be necessary to disconnect the DAP connection from ground and tie it to V- instead (see instructions below).
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Top Side Bottom Side  2001 National Semiconductor Corporation 3 www.national.
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LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTENT APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 1.
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