CLC730027 - National Semiconductor

The CLC730013, CLC730027, and CLC730077

evaluation boards are designed to aid in the characteri-

zation of National Semiconductor’s 8-pin, monolithic

amplifiers.

■CLC730013 - DIP packages

Uses all through-hole components

■CLC730027 - SOIC packages

Uses all through-hole components with a

surface-mount amplifier

■CLC730077 - MSOP packages

Uses all surface-mount components with an

MSOP amplifier

Both boards have identical circuit configurations and are

designed for non-inverting gains. Inverting gains

or other circuit configurations can be obtained with slight

modifications to the boards. Use the evaluation boards

as a:

■Guide for high frequency layout

■Tool to aid in device testing and characterization

The evaluation boards accommodate general purpose

amplifiers, as well as amplifiers with the following features:

■Supply current adjustment

■Output disable

■Output clamps

■Input offset voltage nulling

The evaluation board schematic is shown. And for each

amplifier that uses these evaluation boards, a table is given

that includes recommended values and components that

are not needed to evaluate that amplifier. Refer to the

product data sheet for amplifiers that use these evalua-

tion boards and are not listed in this document.

Basic Operation

Figure 1 shows the non-inverting schematic for both

boards. The input signal is brought into the board

through SMA connectors to the non-inverting input

of the amplifier. The resistor Rin is used to set the

input termination resistance to the op amp. The non-

inverting gain is set by the following equation:

Non-inverting Gain:

The value of the feedback resistor, Rf, has a strong influ-

ence on AC performance. Refer to the product data sheet

for feedback resistor selection. The output of the op amp

travels through a series resistance, Rout, and then leaves

the board through an SMA connector. The series resis-

tance, Rout, matches transmission lines or isolates the

output from capacitive loads.

Figure 1: Non-inverting Gain Configurations

Figure 2: Inverting Gain Configurations

8-Pin Op Amp Evaluation Boards

Part Numbers CLC730013, CLC730027, CLC730077

December 2000

OUT

+VCC

-VCC

Rin Rout

+VCC

-VCC

R2R4

OUT

+VCC

-VCC

Rin Rout

+VCC

-VCC

R2R4

Printed in the U.S.A.

Inverting Gain Operation

The evaluation boards can be modified to provide an

inverting gain configuration. Figure 2 illustrates the invert-

ing gain configuration. Complete these steps to modify

the board:

1. Cut the input trace as shown in Figure 3

2. Use 25Ωfor Rin

3. Terminate Rgat the input trace instead of

ground (See Figure 3)

4. Add Rtfor desired input impedance (input

impedance = Rg||Rt)

Figure 3: Modifications for Inverting Gains

(CLC730013 board shown)

Layout Considerations

General layout and supply bypassing play major roles in

high frequency performance. When designing your own

board, use the evaluation board as a guide and follow

these steps as a basis for high frequency layout:

1. Use a ground plane.

2. Include 6.8µF tantalum and 0.1µF ceramic

capacitors on both supplies.

3. Place the 6.8µF capacitors within 0.75 inches

of the power pins.

4. Place the 0.1µF capacitors less than 0.1

inches from the power pins.

5. Remove the ground plane under and around

the part, especially near the input and output

pins to reduce parasitic capacitance.

6. Minimize all trace lengths to reduce series

inductances.

7. Use individual flush-mount sockets, for prototyping.

Measurement Hints

If 50Ωcoax and 50ΩRin/Rout resistors are used, many of

the typical performance plots found in the product data

sheets can be reproduced.

When SMA connectors and cables are not available to

evaluate the amplifier, do not use normal oscilloscope

probes. Use low impedance resistive divider probes of

100 to 500Ω. If a low impedance probe is not available,

then a section of 50Ωcoaxial cable and a low impedance

resistor (10Ωto 50Ω) may be used. Follow these 3 steps

to create a “cable/resistor”probe:

1. Connect one end of the coax’s center to a test

measurement box terminated in 50Ω.

2. Connect the other end of the cable’s center

conductor to the low impedance resistor. (The

open side of the resistor is now a probe.)

3. Connect the ground shield of the cable to

evaluation board ground and test box ground.

Figure 4: “Cable/Resistor” Probe Configuration

This “cable/resistor”probe, shown in Figure 4, forms a

voltage attenuator between the resistor and the 50Ωter-

mination resistance of the test box. This method allows

measurements to be performed directly on the output pin

of the amplifier.

Power Supplies

Refer to the product data sheet for the recommended

supply voltages.

http://www.national.com 2

Test Box and

Evaluation Board

Ground

50Ω Coaxial

Cable Low Impedance

Resistor

Probe

Test Box

(terminated

in 50Ω)

30013

EV C

ND +Vcc

RIN

Comlinear

(970) 226-050

25Ω

Cut Here

3http://www.national.com

C4 +

RIN

C1 C6

ROUT

OUT

GND-Vcc +Vcc

Comlinear

(970) 226-0500

730027

REV C

SOIC – Top Side SOIC – Bottom Side

-Vcc GND +Vcc

ROUT

RIN

C5 C1

OUT

Comlinear

(970) 226-0500

730013

REV C

DIP – Top Side DIP – Bottom Side

MSOP – Top Side MSOP – Bottom Side

Refer to the product data sheet for amplifiers that use the CLC730013 and CLC730027 evaluation boards and

are not listed below.

Common Components for all amplifiers:

■Rf, Rg- Use the product data sheet to select values

■Rin, Rout - 50Ω(Refer to Basic Operation section for details)

■Rt- Optional resistor for inverting gain configurations (Refer to Inverting Gain Operation section for details)

■C1, C2 - 0.1µF ceramic capacitors

■C3, C4 - 6.8µF tantalum capacitors

CLC400 wideband current feedback op amp optimized

for low gains

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers above for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers above for details)

■R5 - 20kΩpot (optional input offset null)

■C7 - 0.01µF ceramic capacitor (should be used

for best fine scale settling even if R5 is not used)

Components not used:

■C5, C6, C8

■R1, R2, R3, R4, R6, R7, R8

CLC401 wideband current feedback op amp optimized

for high gains

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers above for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers above for details)

Components not used:

■C5, C6, C7, C8

■R1 thru R8

CLC402 wideband current feedback op amp optimized

for low gains, offering extremely fast settling to 0.0025%

accuracy

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers above for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers above for details)

■R7, R8 - 10Ω(optional series supply resistors)

Note: Cut the component side supply traces

that short R7 and R8 to use these resistors.

Components not used:

■C5, C6, C7, C8

■R1 thru R6

CLC404 wideband current feedback op amp opti-

mized for intermediate gain and broad full power

bandwidth

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers above for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers above for details)

Components not used:

■C5, C6, C7, C8

■R1 thru R8

CLC405 wideband, low power, current feedback op

amp, offering low input bias current and a disable

feature

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers above for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers above for details)

■R6 - 0Ωto 1kΩopen collector disable control

Note: Cut trace connecting R6 to -VCC.

Connect R6 to disable logic.

Components not used:

■C5, C6, C7, C8

■R1, R2, R3, R4, R5, R7, R8

CLC406 intermediate performance, low power op amp

optimized for midrange gains (±1 to ±10)

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers above for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers above for details)

Components not used:

■C5, C6, C7, C8

■R1 thru R8

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CLC407 wideband, low power, programmable gain buffer,

offering low input bias current and a disable feature

Component Values:

■Rf, Rg- Internal resistors (refer to data sheet

for gain selection, +2, +1, -1V/V)

■Rin, Rout, Rt- Common Components, (see

Common Components for all

amplifiers on page 4 for details)

■C1, C2, C3, C4 - Common Components, (see

Common Components for all

amplifiers on page 4 for details)

■R6 - 0Ωto 1kΩopen collector disable control

Note: Cut trace connecting R6 to -VCC.

Connect R6 to disable logic.

Note: To optimize off-isolation, cut the Rf

trace. Refer to data sheet for details.

Components not used:

■C5, C6, C7, C8

■R1, R2, R3, R4, R5, R7, R8

CLC409 very wideband current feedback op amp

optimized for low gains, offering exceptionally low

harmonic distortion

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C8 - 0.01µF ceramic capacitor (optional

supply-to-supply de-coupling for reduced

distortion)

Components not used:

■C5, C6, C7

■R1 thru R8

CLC410 wideband op amp optimized for low gains (sim-

ilar to the CLC400) with output disable capability

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■R5 - 20kΩpot (optional input offset null)

■C7 - 0.01ΩF ceramic capacitor (should be used

for best fine scale settling even if R5 is not used)

■R6 - 0Ωto 1kΩopen collector disable control

Note: Cut trace connecting R6 to -VCC.

Connect R6 to disable logic.

Components not used:

■C5, C6, C8

■R1, R2, R3, R4, R7, R8

CLC411 wideband current feedback op amp optimized

for low gains, using ±15V power supplies

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C6, C7 - 0.01µF ceramic capacitors (used to

reduce high frequency noise, >10MHz)

■R6 - 0Ωto 1kΩopen collector disable control

Note: Cut trace connecting R6 to -VCC.

Connect R6 to disable logic.

Components not used:

■C5, C8

■R1, R2, R3, R4, R5, R7, R8

CLC420 wideband unity gain stable, voltage feedback op

amp, offering low quiescent power dissipation

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers on page 4 for details)

Components not used:

■C5, C6, C7, C8

■R1 thru R8

CLC425 low noise, wideband, voltage feedback op amp opti-

mized for high gains, with adjustable supply current

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■R6 - supply current adjustment (refer to data

sheet for details)

■R7, R8 - 10Ω(optional series supply resistors)

Note: Cut the component side supply traces

that short R7 and R8 to use these resistors.

Components not used:

■C5, C6, C7, C8

■R1 thru R5

5http://www.national.com

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CLC426 low noise, wideband, voltage feedback

op amp optimized for low gains, with adjustable

supply current and unity gain stability with external

compensation

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C6 - compensation capacitor for unity gain

stability (refer to data sheet for details)

■R6 - supply current adjustment (refer to data

sheet for details)

Components not used:

■C5, C7, C8

■R1, R2, R3, R4, R5, R7, R8

CLC430 intermediate performance, current feedback

op amp using ±5 to ±15V power supplies with a disable

feature

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■R6 - 0Ωto 1kΩopen collector disable control

Note: Cut trace connecting R6 to -VCC.

Connect R6 to disable logic.

Components not used:

■C5, C6, C7, C8

■R1, R2, R3, R4, R5, R7, R8

CLC501 wideband current feedback op amp optimized

for high gains, offering an extremely fast output voltage

clamping capability

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■R1, R2, R3, R4 - clamp setting resistors

(refer to data sheet for details)

■C5, C6 - 0.01µF ceramic capacitors (optional

clamp de-coupling)

Components not used:

■C7, C8

■R5 thru R8

CLC502 wideband current feedback op amp optimized

for low gains, with exceptional settling to 0.0025%

offering an extremely fast output voltage clamping

capability

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■R1, R2, R3, R4 - clamp setting resistors

(refer to data sheet for details)

■C5, C6 - 0.01µF ceramic capacitors (optional

clamp de-coupling)

■R7, R8 - 10Ω(optional series supply resistors)

Note: Cut the component side supply traces

that short R7 and R8 to use these resistors.

Components not used:

■C7, C8

■R5, R6

CLC505 wideband current feedback op amp optimized

for intermediate gains, adjustable supply current

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C5 - 100pF ceramic capacitor

■R6 - supply current adjustment (refer to data

sheet for details)

Components not used:

■C6, C7, C8

■R1, R2, R3, R4, R5, R7, R8

CLC5665 low distortion, current feedback op amp using

±5 to ±15V power supplies with a disable feature

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■C1, C2, C3, C4 - Common Components,

(see Common Components for all

amplifiers on page 4 for details)

■R6 - 0Ωto 1kΩopen collector disable control

Note: Cut trace connecting R6 to -VCC.

Connect R6 to disable logic.

Components not used:

■C5, C6, C7, C8

■R1, R2, R3, R4, R5, R7, R8

7http://www.national.com

CLC5801 high speed, low noise, voltage feedback op amp

optimized for high gains, with adjustable supply current

Component Values:

■Rf, Rg, Rin, Rout, Rt- Common Components,

(see on page 4 for details)

■C1, C2, C3, C4 - Common Components,

(see on page 4 for details)

■R6 - supply current adjustment (refer to data

sheet for details)

■R7, R8 - 10Ω(optional series supply resistors)

Note: Cut the component side supply traces

that short R7 and R8 to use these resistors.

Components not used:

■C5, C6, C7, C8

■R1 thru R5

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expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

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