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

N November 1998

CLC446

400MHz, 50mW Current-Feedback Op Amp

General Description

The National CLC446 is a very high-speed unity-gain-stable cur- rent-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/ s slew rate and 900ps rise/fall times. The CLC446 achieves its superior speed- vs-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/ s), 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.

Features

■400MHz bandwidth (Av = +2)

■5mA supply current

■0.02%, 0.03° differential gain, phase

■2000V/ s 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

Non-Inverting

Frequency Response (Av = +2)

8

Vo = 0.5Vpp

6

(dB)	4
Gain	2
	0
	-2
				10M	100M
	1M					1G

Frequency (Hz)

400MHz,	CLC446
Amp Op Feedback-Current 50mW

	Typical Application				Pinout
	Elliptic-Function Low Pass Filter				DIP & SOIC
R1	R2	C1
Vin			+		VCC
					Vo
	C2	R4	CLC446	R5
C3			-
	C4			C5	VEE
R3			Rf
			Rg
© 1998 National Semiconductor Corporation					http://www.national.com

Printed in the U.S.A.

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		Vo < 0.2Vpp	400	340	300	300	MHz
gain flatness	Vo < 2.0Vpp	Vo < 2.0Vpp	280	210	190	190	MHz
		<100MHz	±0.05	±0.2	±0.2	±0.2	dB
linear phase dev. Vo < 2.0Vpp		<100MHz	0.2	0.5	0.8	0.8	deg
differential gain		NTSC, RL=150Ω	0.02	0.04	0.04	0.04	%
differential phase		NTSC, RL=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
2nd harmonic distortion		2V , 5MHz	-65	-59	-58	-58	dBc
		pp
		2Vpp, 20MHz	-55	-48	-48	-48	dBc
3rd harmonic distortion		2Vpp, 50MHz	-54	-43	-42	-42	dBc
		2V , 5MHz	-78	-70	-68	-68	dBc
		pp
		2Vpp, 20MHz	-70	-62	-60	-60	dBc
equivalent input noise		2Vpp, 50MHz	-50	-45	-42	-42	dBc
							nV/√Hz
voltage (eni)		>1MHz	3.8	4.8	5.0	5.1
non-inverting current (ibn)		>1MHz	2.0	2.6	2.8	3.3	pA/√Hz
inverting current (ibi)		>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	µA	A
average drift			30	–	90	130	nA/˚C
input bias current		inverting	10	22	30	35	µA	A
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		RL= ∞	4.8	5.8	6.2	6.2	mA	A
MISCELLANEOUS PERFORMANCE							MΩ
input resistance		non-inverting	1.5	1.0	0.85	0.70
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		RL = 100Ω	±3.1	±2.8	±2.8	±2.6	V
output current		RL = ∞	±3.2	±3.0	±2.9	±2.8	V
			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		θJC		θJA
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

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Typical Performance Characteristics (VCC = ±5V,Av = +2,Rf =249Ω, RL = 100Ω; unless specified)

Non-Inverting Frequency Response Inverting Frequency Response Frequency Response vs. RL

(1dB/div)	Vo = 0.5Vpp	Av = 1V/V		(1dB/div)
			Av = 2V/V
		Rf = 453Ω
			Rf = 249Ω
			(deg)Phase
Magnitude			0	Magnitude
	Av = 10V/V		-90
Normalized				Normalized
	Rf = 200Ω		-180
		Av = 5V/V	-270
			-360
		Rf = 200Ω
			-450
1M	10M	100M	1G

	Vo = 0.5Vpp	Av = -1V/V		(1dB/div)
			Av = -2V/V
		Rf = 249Ω
			Rf = 249Ω
			(deg)Phase
			-180	Magnitude
			-225
		Av = -5V/V	-270	Normalized
		Rf = 200Ω	-315
		Av = -10V/V
			-360
		Rf = 200Ω
1M	10M	100M	1G

	Vo = 0.5Vpp		(deg) Phase
		RL = 1kΩ
			0
			-90
		RL = 100Ω	-180
			-270
		RL = 500Ω
			-360
			-450
1M	10M	100M	1G

Frequency (Hz)

Frequency (Hz)

Frequency (Hz)

Frequency Response vs. Vo

(1dB/div)		0.1Vpp
			1Vpp
Magnitude		4Vpp
		2Vpp
Normalized
1M	10M	100M	1G

Frequency (Hz)

Small Signal Pulse Response

	(0.5V/div)Voltage
															Av = +2V/V
	Output
															Av = -2V/V
												Time (2ns/div)
		2nd Harmonic Distortion
	-50
				Vo = 2Vpp
(dBc)	-60
	-70
							2nd RL				= 100Ω
Distortion	-80
								2nd			RL = 1kΩ
	-90
	-100
		1M																						10M
												Frequency (Hz)
	-40		2nd Harmonic Distortion vs. Pout
	-50																							10MHz
(dBc)
																								5MHz
Distortion	-60
																								2MHz
	-70
																								1MHz
	-80
		-4 -2						0			2				4					6		8 10 12
										Output Power (dBm)

Frequency Response vs. CL

(1dB/div)							50
			CL = 10pF				40
			Rs = 46.4Ω
Magnitude				CL = 22pF
				Rs = 33.2Ω		)	30
						(Ω
					CL = 47pF	s
						R
					Rs = 21Ω		20
Normalized					CL = 100pF
	+		Rs		Rs = 13.3Ω
							10
	-	249Ω	CL		1k
	249Ω
							0
	1M			10M	100M	1G

Recommended Rs vs. CL

10

20

30

40

50

60

70

80

90

100

Frequency (Hz)

Large Signal Pulse Response

Voltage(1V/div)	Av = +2V/V
Output	Av = -2V/V

Time (2ns/div)

3rd Harmonic Distortion

	-50
			Vo = 2Vpp
(dBc)	-60
	-70
Distortion
	-80			3rd RL = 100Ω
	-90
						3rd RL		= 1kΩ
	-100
	1M													10M

Frequency (Hz)

3rd Harmonic Distortion vs. Pout

	-65
	-70				10MHz
(dBc)	-75				5MHz
Distortion	-80
	-85				2MHz
					1MHz
	-90
	-95
	-4	-2	0	2	4	6	8	10	12

Output Power (dBm)

					CL(pF)
Equivalent Input Noise
100											100
NoiseVoltage(nV/ÖHz)											Hz)(pA/NoiseÖ Current
							ibi
10
											10
							eni
							ibn
1											1
1k		10k		100k		1M		10M		100M
				Frequency (Hz)

Differential Gain and Phase (3.58MHz)

	0.01			0
Gain (%)	0		Phase Pos Sync	-0.04	Differential
	-0.01	Phase Neg Sync		-0.08
Differential					(deg) Phase
	-0.02	Gain Pos Sync		-0.12
	-0.03		Gain Neg Sync	-0.16
	-0.04			-0.2
	1	2	3	4

Number of 150Ω Loads

	Vos, IBN, & IBI vs. Temperature
	2							2
							Vos
									I
(mV)									BI
	1							-2	I ,
						IBN			BN
os									(
V									A)m
	0							-6
						IBI
	-1							-10
	-60	-40	-20	0	20	40	60	80

Temperature (°C)

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Typical Performance Characteristics (VCC = ±5V, A v = +2, Rf = 249Ω, RL = 100Ω; unless specified)

Short Term Settling Time

Long Term Settling Time

0.2

VO = 2V step

0.2

VO = 2V step

Step)

Step)

0.1

0.1

Output(%

Output(%

0

0

o

-0.1

o

-0.1

V

V

-0.2

-0.2

1n

10n

100n

1μ

10μ

1μ

10μ

100μ

1m

10m

100m

1

Time (sec)

Time (s)

CLC446 Operation

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 Rf

■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:

Vo	=			Av
V		1+			Rf
in					Z(jw)

where

■Av is the DC voltage gain

■Rf is the feedback resistor

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

■Z(jw) is the loop-gain

Rf

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

■Decreases loop-gain

■Decreases bandwidth

■Lowers pulse response overshoot

■Reduces gain peaking

■Affects frequency response phase linearity

CLC446 Design Information

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 Av = 1+ Rf . Rg

The normalized gain plots in the Typical Performance Characteristics section show different feedback resistors (Rf) for different gains. These values of Rf are recommended for obtaining the highest bandwidth with minimal peaking. The resistor Rt provides DC bias for the non-inverting input.

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

	Select Rg to set the DC gain: Rg =	Rf			.
		Av	- 1

DC gain accuracy is usually limited by the tolerance of Rf and Rg.

VCC

				6.8mF
					+
Vin		3	7	0.1mF
			+		6	Vo
	Rt		CLC446
		2
			-
					Rf
			4
		Rg		0.1mF
					+

6.8mF

VEE

Fi

Figure 1: Non-Inverting Gain

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