N

CLC425

Ultra Low Noise Wideband Op Amp

© 1999 National Semiconductor Corporation

http://www.national.com

Printed in the U.S.A.

General Description

The CLC425 combines a wide bandwidth (1.9GHz GBW) with very

low input noise (1.05nV/

√√√√√Hz, 1.6pA/√√√√√Hz) and low dc errors (100µµµµµV

µµµµµV/°C drift) to provide a very precise, wide dynamic-range

op amp offering closed-loop gains of

≥10.

Singularly suited for very wideband high-gain operation, the CLC425

employs a traditional voltage-feedback topology providing all the

benefits of balanced inputs, such as low offsets and drifts, as well

as a 96dB open-loop gain, a 100dB CMRR and a 95dB PSRR.

The CLC425 also offers great flexibility with its externally adjustable

supply current, allowing designers to easily choose the optimum

set of power, bandwidth, noise and distortion performance.

Operating from ±5V power supplies, the CLC425 defaults to a

15mA quiescent current, or by adding one external resistor, the

supply current can be adjusted to less than 5mA.

The CLC425's combination of ultra-low noise, wide gain-band-

width, high slew rate and low dc errors will enable applications in

areas such as medical diagnostic ultrasound, magnetic tape & disk

storage, communications and opto-electronics to achieve maximum

high-frequency signal-to-noise ratios.

The CLC425 is available in the following versions:

CLC425AJP

-40°C to +85°C

8-pin PDIP

CLC425AJE

-40°C to +85°C

8-pin SOIC

CLC425A8B

-55°C to +125°C

8-pin CERDIP,

MIL-STD-883, Level B

CLC425ALC

-40°C to +85°C

dice

CLC425AMC

-55°C to +125°C

dice, MIL-STD-883, Level B

CLC425AJM5

-40°C to +85°C

5-pin SOT

DESC SMD number : 5962-93259.

June 1999

Features

s

1.9GHz gain-bandwidth product

s

1.05nV/

√Hz input voltage noise

s

0.8pA/

√Hz @ Icc < 5mA

s

100

µV input offset voltage, 2µV/°C drift

s

350V/

µs slew rate

s

15mA to 5mA adjustable supply current

s

Gain range ±10 to ±1,000V/V

s

Evaluation boards & simulation

macromodel

s

Applications

s

Instrumentation sense amplifiers

s

Ultrasound pre-amps

s

Magnetic tape & disk pre-amps

s

Photo-diode transimpedance amplifiers

s

Wide band active filters

s

Low noise figure RF amplifiers

s

Professional audio systems

s

Low-noise loop filters for PLLs

Frequency (Hz)

10

1

Equivalent Input Voltage Noise

100

1k

10k

100k

1M

10M

100M

1.05nV/

√Hz

Pinout

SOT23-5

-

+

1

2

3

4

NC

V

inv

V

non-inv

-V

cc

NC

8

7

6

5

Pinout

DIP & SOIC