CLC426
Wideband, Low Noise, Voltage Feedback Op Amp

General Description

The National CLC426 combines an enhanced voltage feed-
back architecture with an advanced complimentary bipolar
process to provide a high speed op amp with very low noise
(1.6nV/

& 2.0pA/

) and distortion (-62dBc/-68dBc

2nd/3rd harmonics at 1V

and 10MHz).

Providing a wide 230MHz gain bandwidth product, a fast
400V/µs slew rate and very quick 16ns settling time to
0.05%, the CLC426 is the ideal choice for high speed appli-
cations requiring a very wide dynamic range such as an
input buffer for high resolution analog-to-digital converters.

The CLC426 is internally compensated for gains

2V/V and

can easily be externally compensated for unity gain stability
in applications such as wideband low noise integrators. The
CLC426 is also equipped with external supply current adjust-
ment which allows the user to optimize power, bandwidth,
noise and distortion performance for each application.

The CLC426's combination of speed, low noise and distor-
tion and low dc errors will allow high speed signal condition-
ing applications to achieve the highest signal-to-noise per-
formance. To reduce design times and assist board layout,
the CLC426 is supported by an evaluation board and SPICE
simulation model available from National.

For even higher gain-bandwidth voltage-feedback op amps
see the 1.9GHz CLC425 (A

10V/V) or the 5.0GHz

CLC422 (A

30V/V).

Enhanced Solutions (Military/Aerospace

SMD Number: 5962-94597

Space level versions also available.

For more information, visit http://www.national.com/mil

Features

Wide gain-bandwidth product: 230MHz

Ultra low input voltage noise: 1.6nV/

Very low harmonic distortion: -62/-68dBc

Fast slew rate: 400V/µs

Adjustable supply current

Dual

2.5 to

5V or single 5 to 12V supplies

Externally compensatable

Applications

Active filters & integrators

Ultrasound

Low power portable video

ADC/DAC buffer

Wide dynamic range amp

Differential amps

Pulse/RF amp

Connection Diagram

Input Voltage Noise Density

DS012709-1

DS012709-4

Pinout

DIP & SOIC

Frequency Response

DS012709-3

July 2001

CLC426

ideband,

Low

Noise,

oltage

Feedback

Amp

DS012709

www.national.com

Absolute Maximum Ratings

(Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Supply Voltage

Short Circuit Current

(Note 6)

Common-Mode Input Voltage

Differential Input Voltage

10V

Maximum Junction Temperature

+150°C

Storage Temperature

-65°C to +150°C

Lead Temperature (Soldering 10 sec)

+300°C

ESD

2000V

Electrical Characteristics

5; A

= +2V/V; R

= 100

; R

= 100

; unless noted)

Notes

Parameters

Conditions

Typ

Max/Min Ratings (Note 2)

Units

Ambient Temperature

CLC426

+25°C

to+70°C

-40

to+85°C

Frequency Domain Response

Gain Bandwidth Product

OUT

0.5V

230

170

120

100

MHz

(Note 4),
(Note 5),
(Note 8)

-3dB Bandwidth, A

= +2

OUT

0.5V

130

MHz

OUT

5.0V

MHz

Gain Flatness

OUT

0.5V

(Note 4),
(Note 8)

Peaking

DC to 200MHz

0.6

1.5

2.2

2.5

(Note 4),
(Note 8)

Rolloff

DC to 30MHz

0.0

0.6

1.0

Linear Phase Deviation

DC to 30MHz

0.2

1.0

1.5

deg

Time Domain Response

Rise and Fall Time

1V Step

2.3

3.5

5.0

6.5

Settling Time

2V Step to 0.05%

Overshoot

1V Step

Slew Rate

5V Step

400

300

275

250

V/µs

Distortion And Noise Response

(Note 3)

2nd Harmonic Distortion

,10MHz

-62

-52

-47

-45

dBc

(Note 3)

3rd Harmonic Distortion

,10MHz

-68

-58

-54

dBc

Equivalent Input Noise

Op Amp Only

Voltage

1MHz to 100MHz

1.6

2.0

2.3

2.6

nV/

Current

1MHz to 100MHz

2.0

3.0

3.6

4.6

pA/

Static DC Performance

Open-Loop Gain

(Note 3)

Input Offset Voltage

1.0

2.0

2.8

Average Drift

µV/°C

(Note 3)

Input Bias Current

µA

Average Drift

600

700

nA/°C

(Note 3)

Input Offset Current

0.3

µA

Average Drift

nA/°C

(Note 4)

Power-Supply Rejection Ratio

Common-Mode Rejection Ratio

(Note 3)

Supply Current

Pin #8 Open,
R

Miscellaneous Performance

Input Resistance

Common-Mode

500

250

125

Differential-Mode

750

200

Input Capacitance

Common-Mode

2.0

3.0

Differential-Mode

2.0

3.0

CLC426

www.national.com

Electrical Characteristics

(Continued)

5; A

= +2V/V; R

= 100

; R

= 100

; unless noted)

Notes

Parameters

Conditions

Typ

Max/Min Ratings (Note 2)

Units

Miscellaneous Performance

Output Resistance

Closed Loop

0.07

0.1

0.2

Output Voltage Range

3.8

3.5

3.3

= 100

3.5

3.2

2.6

1.3

Input Voltage Range

Common Mode

3.7

3.5

3.3

Output Current

+35,

-20

Note 1: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The table of "Electrical Characteristics" specifies conditions of device operation.

Note 2: Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are determined
from tested parameters.

Note 3: J-level: spec. is 100% tested at +25°C, sample at 85°C. L-level: spec. is 100% wafer probed at 25°C.

Note 4: J-level: spec is sample tested at 25°C

Note 5: Minimum table stable gain with out external compensation is +2 or -1V/V, the CLC426 unity-gain stable with external compensation.

Note 6: Output is short circuit protected to ground, however maximum reliability is obtained if output current does not exceed 160mA

Note 7: See test for compensation techniques.

Note 8: Spec is guaranteed to 0.5V

but tested with 0.1V

Typical Performance Characteristics

= 25°C,

5V, A

= +2, R

= 100

, R

= 100

unless noted)

Non-Inverting Frequency Response

DS012709-5

Inverting Frequency Response

DS012709-6

Frequency Response vs. Load Resistance

DS012709-7

Open-Loop Gain vs. Supply Current

DS012709-8

CLC426

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