NSC CLC446MDC, CLC446AJP, CLC446AJE-TR13, CLC446AJE, 5962-9751901MPA Datasheet

Features

■

400MHz bandwidth (Av = +2)

■

5mA supply current

■

0.02%, 0.03° differential gain, phase

■

2000V/µs slew rate

■

9ns settling to 0.1%

■

0.05dB gain flatness to 100MHz

■

-65/-78dBc HD2/HD3

Applications

■

High resolution video

■

A/D driver

■

Medical imaging

■

Video switchers & routers

■

RF/IF amplifier

■

Communications

■

Instrumentation

General Description

The National CLC446 is a very high-speed unity-gain-stable cur­rent-feedback op amp that is designed to deliver the highest lev­els of performance from a mere 50mW quiescent power. It pro­vides a very wide 400MHz bandwidth, a 2000V/µs slew rate and
900ps rise/fall times. The CLC446 achieves its superior speed­vs-power using an advanced complementary bipolar IC process
and National’s current-feedback architecture.

The CLC446 is designed to drive video loads with very low
differential gain and phase errors (0.02%, 0.03°). Combined with
its very low power (50mW), the CLC446 makes an excellent
choice for NTSC/PAL video switchers and routers. With its very
quick edge rates (900ps) and high slew rate (2000V/µs), the
CLC446 also makes an excellent choice for high-speed, high­resolution component RGB video systems.

The CLC446 makes an excellent low-power high-resolution A/D
converter driver with its very fast 9ns settling time (to 0.1%) and
low harmonic distortion.

The combination of high performance and low power make
the CLC446 useful in many high-speed general purpose
applications. Its current-feedback architecture maintains consistent
performance over a wide gain range and signal levels. DC gain
and bandwidth can be set independently. Also, either maximally
flat AC response or linear phase response can be emphasized.

V

in

R

4

R

f

+

-

R

g

C

2

CLC446

C

5

V

o

R

5

R

1

R

2

C

3

C

4

R

3

C

1

Typical Application

Elliptic-Function Low Pass Filter

CLC446
400MHz, 50mW Current-Feedback Op Amp

Non-Inverting
Frequency Response (Av = +2)

Gain (dB)

Frequency (Hz)

8

6

1M

1G

2

-2

4

0

10M 100M

Vo = 0.5V

pp

V

EE

V

CC

Pinout

DIP & SOIC

November 1998

CLC446

400MHz, 50mW Current-Feedback Op Amp

N

© 1998 National Semiconductor Corporation http://www.national.com

Printed in the U.S.A.

http://www.national.com 2

Electrical Characteristics

(AV= +2, Rf= 249Ω:VCC= + 5V, RL= 100Ω; unless specified)

PARAMETERS CONDITIONS TYP MIN/MAX RATINGS UNITS NOTES
Ambient Temperature CLC446AJ +25˚C +25˚C 0 to 70˚C -40 to 85˚C

FREQUENCY DOMAIN RESPONSE

-3dB bandwidth V

o

< 0.2V

pp

400 340 300 300 MHz

V

o

< 2.0V

pp

280 210 190 190 MHz

gain flatness V

o

< 2.0V

pp

<100MHz ±0.05 ±0.2 ±0.2 ±0.2 dB

linear phase dev. V

o

< 2.0V

pp

<100MHz 0.2 0.5 0.8 0.8 deg

differential gain NTSC, R

L

=150Ω 0.02 0.04 0.04 0.04 %

differential phase NTSC, R

L

=150Ω 0.03 0.05 0.05 0.05 deg

TIME DOMAIN RESPONSE

rise and fall time 2V step 0.9 1.4 1.5 1.6 ns
settling time to 0.1% 2V step 9 13 15 15 ns
overshoot 2V step 6 15 18 18 %
slew rate 2V step, ±0.5V crossing 2000 1400 1300 1200 V/µs

DISTORTION AND NOISE RESPONSE

2

nd

harmonic distortion 2Vpp, 5MHz -65 -59 -58 -58 dBc

2V

pp

, 20MHz -55 -48 -48 -48 dBc

2V

pp

, 50MHz -54 -43 -42 -42 dBc

3

rd

harmonic distortion 2Vpp, 5MHz -78 -70 -68 -68 dBc

2V

pp

, 20MHz -70 -62 -60 -60 dBc

2V

pp

, 50MHz -50 -45 -42 -42 dBc

equivalent input noise

voltage (e

ni

) >1MHz 3.8 4.8 5.0 5.1 nV/√Hz

non-inverting current (i

bn

) >1MHz 2.0 2.6 2.8 3.3 pA/√Hz

inverting current (i

bi

) >1MHz 16 19 20 21 pA/√Hz

STATIC DC PERFORMANCE

input offset voltage 2 7 10 11 mV A

average drift 17 – 25 35 µV/˚C

input bias current non-inverting 3 12 25 25 µAA

average drift 30 – 90 130 nA/˚C

input bias current inverting 10 22 30 35 µAA

average drift 26 – 75 85 nA/˚C
power supply rejection ratio DC 52 45 43 43 dB
common-mode rejection ratio DC 48 44 42 42 dB
supply current R

L

= ∞ 4.8 5.8 6.2 6.2 mA A

MISCELLANEOUS PERFORMANCE

input resistance non-inverting 1.5 1.0 0.85 0.70 MΩ
input capacitance non-inverting 1 2 2 2 pF
input range common-mode ±2.8 ±2.6 ±2.4 ±2.3 V
output voltage range R

L

= 100Ω ±3.1 ±2.8 ±2.8 ±2.6 V

R

L

= ∞ ±3.2 ±3.0 ±2.9 ±2.8 V
output current 48 48 48 48 mA
output resistance, closed loop DC 0.04 0.1 0.1 0.1 Ω

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

Absolute Maximum Ratings

supply voltage

±

6V
output current ±48mA
common-mode input voltage

±

Vcc
maximum junction temperature +175˚C
storage temperature range -65˚C to +150˚C
lead temperature (soldering 10 sec) +300˚C
ESD rating (human body model) 1000V

Notes

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

Ordering Information

Model Temperature Range Description

CLC446AJP -40˚C to +85˚C 8-pin PDIP
CLC446AJE -40˚C to +85˚C 8-pin SOIC
CLC446ALC -40˚C to +85˚C dice
CLC446A8B -55˚C to +125˚C 8-pin CerDIP, MIL-STD-883
CLC446AMC -55˚C to +125˚C dice, MIL-STD-883
Contact the factory for other packages and DESC SMD number.

Package Thermal Resistance

Package

θθ

JC

θθ

JA

Plastic (AJP) 70˚C/W 125˚C/W
Surface Mount (AJE) 60˚C/W 140˚C/W
Ceramic (A8B) 40˚C/W 130˚C/W

Reliability Information

Transistor Count 36
MTBF (based on limited test data) 39Mhr

3 http://www.national.com

Typical Performance Characteristics

(VCC= ±5V ,Av= +2,Rf=249

ΩΩ,,

RL= 100ΩΩ; unless specified)

Non-Inverting Frequency Response

Normalized Magnitude (1dB/div)

Frequency (Hz)

10M

100M

1G

Vo = 0.5V

pp

Phase (deg)

0

-90

-360

-180

-270

-450

1M

Av = 1V/V
R

f

= 453Ω

Av = 2V/V
Rf = 249Ω

Av = 5V/V
Rf = 200Ω

Av = 10V/V

Rf = 200Ω

Inverting Frequency Response

Normalized Magnitude (1dB/div)

Frequency (Hz)

1M 10M

1G

Phase (deg)

-180

-225

-360

-270

-315

100M

Vo = 0.5V

pp

Av = -1V/V
R

f

= 249Ω

Av = -2V/V
R

f

= 249Ω

Av = -5V/V
R

f

= 200Ω

Av = -10V/V

R

f

= 200Ω

Frequency Response vs. R

L

Normalized Magnitude (1dB/div)

Frequency (Hz)

10M 100M

1G

Phase (deg)

0

-90

-360

-180

-270

-450

1M

RL = 1kΩ

RL = 100Ω

RL = 500Ω

Vo = 0.5V

pp

Frequency Response vs. V

o

Normalized Magnitude (1dB/div)

Frequency (Hz)

1M

10M 100M

1G

0.1V

pp

1V

pp

4V

pp

2V

pp

Frequency Response vs. C

L

Normalized Magnitude (1dB/div)

Frequency (Hz)

1M

10M 100M

1G

CL = 22pF

R

s

= 33.2Ω

CL = 10pF
R

s

= 46.4Ω

CL = 47pF

R

s

= 21Ω

CL = 100pF

R

s

= 13.3Ω

C

L

1k

R

s

+

-

249Ω

249Ω

Recommended Rs vs. C

L

R

s

(Ω)

CL(pF)

40

30

0

10

20

100

20

10

30

40 50 60 70 80 90

50

Small Signal Pulse Response

Output Voltage (0.5V/div)

Time (2ns/div)

Av = +2V/V

Av = -2V/V

Large Signal Pulse Response

Output Voltage (1V/div)

Time (2ns/div)

Av = -2V/V

Av = +2V/V

Equivalent Input Noise

Voltage Noise (nV/

√

Hz)

Frequency (Hz)

100

1

1k

10k 100k

10

Current Noise (pA/

√Hz)

100

1

10

1M 10M

i

bi

e

ni

i

bn

100M

2nd Harmonic Distortion

Distortion (dBc)

Frequency (Hz)

-50

-60

-90

1M

10M

-70

-80

Vo = 2V

pp

-100

2nd RL = 100Ω

2nd RL = 1kΩ

3rd Harmonic Distortion

Distortion (dBc)

Frequency (Hz)

-60

-70

-100
1M

10M

-80

-90

Vo = 2V

pp

-50

3rd RL = 100Ω

3rd RL = 1kΩ

Differential Gain and Phase (3.58MHz)

Differential Gain (%)

Number of 150Ω Loads

0.01

0

-0.03

1

2

3

-0.01

-0.02

Differential Phase (deg)

-0.04

-0.08

-0.2

-0.12

-0.16

-0.04

0

4

Phase Pos Sync

Phase Neg Sync

Gain Pos Sync

Gain Neg Sync

2nd Harmonic Distortion vs. P

out

Distortion (dBc)

Output Power (dBm)

-40

-50

-80

-4

-2 0

-60

-70

2

4

68

10 12

10MHz

5MHz

2MHz

1MHz

3rd Harmonic Distortion vs. P

out

Distortion (dBc)

Output Power (dBm)

-65

-70

-85

-4

-2

-75

-80

-90

-95
02

46

81012

10MHz

5MHz

2MHz

1MHz

Vos, IBN, & IBI vs. Temperature

V

os

(mV)

Temperature (°C)

2

1

-60

-40

-20

0

-1

I

BI

, I

BN

(µA)

2

-2

-6

-10

0

20 40

60 80

I

BN

V

os

I

BI

http://www.national.com 4

The CLC446 has a current-feedback architecture built in
an advanced complementary bipolar process. The key
features of current-feedback are:

■

AC bandwidth is independent of voltage gain

■

Unity-gain stability

■

Frequency response may be adjusted with R

f

■

High slew rate

■

Low variation in performance for a wide range
of gains, signal levels and loads

■

Fast settling

Current-feedback operation can be explained with a
simple model. The voltage gain for the circuits in Figures
1 and 2 is approximately:

where

■

Avis the DC voltage gain

■

Rfis the feedback resistor

■

Z(jω) is the CLC446’s open-loop
transimpedance gain

■

is the loop-gain

The denominator of the equation above is approximately
1 at low frequencies. Near the -3dB corner
frequency, the interaction between Rfand Z(jω)
dominates the circuit performance. Increasing Rfdoes
the following:

■

Decreases loop-gain

■

Decreases bandwidth

■

Lowers pulse response overshoot

■

Reduces gain peaking

■

Affects frequency response phase linearity

CLC446 Operation

The following topics will supply you with:

■

Design parameters, formulas and techniques

■

Interfaces

■

Application circuits

■

Layout techniques

■

SPICE model information

DC Gain (non-inverting)

The non-inverting DC voltage gain for the configuration
shown in Figure 1 is .
The normalized gain plots in the

Typical Performance

Characteristics

section show different feedback
resistors (Rf) for different gains. These values of Rfare
recommended for obtaining the highest bandwidth with
minimal peaking. The resistor Rtprovides DC bias for
the non-inverting input.

For Av< 5, use linear interpolation on the nearest Avval­ues to calculate the recommended value of Rf. For Av≥
5, the minimum recommended Rfis 200Ω.

Select Rgto set the DC gain: .
DC gain accuracy is usually limited by the tolerance of R

f

and Rg.

Figure 1: Non-Inverting Gain

+

-

CLC446

R

f

0.1µF

6.8µF

V

o

V

in

V

CC

0.1µF

6.8µF

V

EE

3

2

4

7

6

+

+

R

g

R

t

Typical Performance Characteristics

(VCC= ±5V, Av= +2, Rf= 249

ΩΩ,,

RL= 100ΩΩ; unless specified)

Short Term Settling Time

V

o

(% Output Step)

Time (sec)

0.2

0.1

-0.2
1n

10n

100n

0

-0.1

1

µ

10

µ

VO = 2V step

Long Term Settling Time

V

o

(% Output Step)

Time (s)

0.2

0.1

-0.2
1

µ

10

µ

100

µ

0

-0.1

1m

10m

100m 1

VO = 2V step

V
V

A

1

R

Zj

o

in

v

f

=

+

()

ω

Zj

R

f

ω

()

A1

R

R

v

f

g

=+

R

R

A1

g

f

v

=

−

CLC446 Design Information