NSC CLC426MDC, CLC426AWG-QML, CLC426AMC, CLC426AJE Datasheet

N

CLC426
Wideband, Low-Noise, Voltage Feedback Op Amp

General Description

The CLC426 combines an enhanced voltage-feedback architecture
with an advanced complementary bipolar process to provide a
high-speed op amp with very low noise (1.6nV/√Hz & 2.0pA/√Hz) and
distortion (-62/-68dBc 2nd/3rd harmonics at 1Vpp 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 applications requiring a very wide­dynamic range such as an input buffer for high-resolution analog-to­digital 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 adjustment which allows the user to
optimize power, bandwidth, noise and distortion performance for each
application.

The CLC426's combination of speed, low noise and distortion and low
dc errors will allow high-speed signal conditioning applications to
achieve the highest signal-to-noise performance. 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 (Av ≥ 10V/V) or the 5.0GHz CLC422 (Av ≥ 30V/V).

June 1999

CLC426

Wideband, Low-Noise, Voltage Feedback Op Amp

Features

■ Wide gain-bandwidth product: 230MHz

■ Ultra-low input voltage noise: 1.6nV/√Hz

■ 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

Wide Dynamic Range

Sallen-Key Band Pass Filter

2nd-Order

(20MHz, Q=10, G=2)

1
2
3
4

NC

V

inv

V

non-inv

-V

cc

R

p

(optional)

+V

cc

V

out

Ext. Comp.

(optional)

8
7
6
5

-

+

Pinout

DIP & SOIC

Typical Application

 1999 National Semiconductor Corporation http://www.national.com

Printed in the U.S.A.

CLC426 Electrical Characteristics CLC426 Electrical Characteristics

CLC426 Electrical Characteristics CLC426 Electrical Characteristics

CLC426 Electrical Characteristics

(V(V

(V(V

(V

CCCC

CCCC

CC

= =

= =

=

±±

±±

±

5V; A5V; A

5V; A5V; A

5V; A

VV

VV

V

= +2V/V; R= +2V/V; R

= +2V/V; R= +2V/V; R

= +2V/V; R

ff

ff

f

=100=100

=100=100

=100

ΩΩ

ΩΩ

Ω

; R; R

; R; R

; R

LL

LL

L

= 100= 100

= 100= 100

= 100

ΩΩ

ΩΩ

Ω

; ;

; ;

;

unless notedunless noted

unless notedunless noted

unless noted

))

))

)

A) J-level: spec is 100% tested at +25°C.

1) Minimum stable gain with out external compensation is +2 or

-1V/V, the CLC426 is unity-gain stable with external
compensation.

2) Output is short circuit protected to ground, however maximum
reliability is obtained if output current does not exceed 160mA.

3) See text for compensation techniques.

http://www.national.com 2

supply voltage ±7V
short circuit current (note 2)
common-mode input voltage ±V

cc

differential input voltage ±10V
maximum junction temperature +150°C
storage temperature -65°C to+150°C
lead temperature (soldering 10 sec) +300°C
ESD rating 2000V

Absolute Maximum Ratings

Notes

PARAMETERSPARAMETERS

PARAMETERSPARAMETERS

PARAMETERS

CONDITIONSCONDITIONS

CONDITIONSCONDITIONS

CONDITIONS

TYP TYP

TYP TYP

TYP

MIN/MAX RATINGSMIN/MAX RATINGS

MIN/MAX RATINGSMIN/MAX RATINGS

MIN/MAX RATINGS

UNITS UNITS

UNITS UNITS

UNITS

NOTESNOTES

NOTESNOTES

NOTES

Ambient Temperature CLC426 +25°C +25°C 0 to +70°C -40 to +85°C

FREQUENCY DOMAIN RESPONSE

gain bandwidth product V

out

< 0.5V

pp

230 170 120 100 MHz

-3dB bandwidth, A

v

=+2 V

out

< 0.5V

pp

130 90 70 55 MHz 1

V

out

< 5.0V

pp

50 25 22 20 MHz

gain flatness V

out

< 0.5V

pp

peaking DC to 200MHz 0.6 1.5 2.2 2.5 dB
rolloff DC to 30MHz 0.0 0.6 1.0 1.0 dB

linear phase deviation DC to 30MHz 0.2 1.0 1.5 1.5 °

TIME DOMAIN RESPONSE

rise and fall time 1V step 2.3 3.5 5.0 6.5 ns
settling time 2V step to 0.05% 16 20 2 4 2 4 n s
overshoot 1V step 5 1 5 15 18 %
slew rate 5V step 400 300 275 2 50 V/µs

DISTORTION AND NOISE RESPONSE

2

nd

harmonic distortion 1Vpp,10MHz - 62 - 52 - 47 - 45 dBc
3rd harmonic distortion 1Vpp,10MHz - 68 - 58 - 54 - 54 dBc
equivalent input noise op amp only

voltage 1MHz to 100MHz 1.6 2.0 2.3 2.6 nV/√Hz
current 1MHz to 100MHz 2. 0 3.0 3.6 4.6 pA/ √Hz

STATIC DC PERFORMANCE

open-loop gain DC 64 60 54 54 dB
input offset voltage 1.0 2.0 2.8 2.8 mV A

average drift 3 --- 1 0 10 µV/°C

input bias current 5 25 4 0 65 µAA

average drift 90 --- 60 0 70 0 nA/°C

input offset current 0.3 3 5 5 µAA

average drift 5 --- 2 5 50 nA/°C
power-supply rejection ratio DC 73 6 5 60 60 dB
common-mode rejection ratio DC 70 6 2 57 5 7 d B
supply current pin #8 open, R

L

= ∞ 11 12 13 15 mA A

MISCELLANEOUS PERFORMANCE

input resistance common-mode 500 250 125 125 kΩ

differential-mode 750 200 50 25 kΩ

input capacitance common-mode 2.0 3.0 3.0 3.0 pF

differential-mode 2.0 3.0 3.0 3.0 pF
output resistance closed loop 0.07 0.1 0.2 0.2 Ω
output voltage range R

L

= ∞ ± 3.8 ± 3.5 ± 3.3 ± 3.3 V

R

L

=100Ω ± 3.5 ± 3.2 ± 2.6 ±1.3 V
input voltage range common mode ± 3.7 ± 3. 5 ± 3 .3 ± 3.3 V
output current ± 70 ± 50 ± 4 0 + 35, -20 mA

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

Model Temperature Range Description

CLC426AJP -40°C to +85°C 8-pin PDIP
CLC426AJE -40°C to +85°C 8-pin SOIC
CLC426A8B -55°C to +125°C 8-pin CerDIP, MIL-STD-883

Ordering Information

Package

θθ

θθ

θ

JC

θθ

θθ

θ

JA

Plastic (AJP) 70°C/W 125°C/W
Surface Mount (AJE) 60°C/W 140°C/W
CerDIP 40°C/W 130°C/W

Package Thermal Resistance

Transistor Count 52

Reliability Information

3 http://www.national.com