LT6557CGN [Linear]

500MHz, 2200V/μs Gain of 2, Single Supply Triple Video Amplifi er with Input Bias Control; 为500MHz ， 2200V / μs的2个，单电源三路视频功率放大器儿与输入偏置控制增益


型号：	LT6557CGN
厂家：	Linear
描述：	500MHz, 2200V/μs Gain of 2, Single Supply Triple Video Amplifi er with Input Bias Control 为500MHz ， 2200V / μs的2个，单电源三路视频功率放大器儿与输入偏置控制增益消费电路音频放大器视频放大器功率放大器
文件：	总12页 (文件大小：596K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LT6557

500MHz, 2200V/µs Gain of 2,

Single Supply Triple Video

Ampliﬁer with Input Bias Control

FEATURES

DESCRIPTION

The LT^®6557 is a high speed triple video ampliﬁer with an

internal ﬁxed gain of 2 and a programmable DC input bias

■

–3dB Small-Signal Bandwidth: 500MHz

■

–3dB 2V Large-Signal Bandwidth: 400MHz

P-P

■

Slew Rate: 2200V/µs

voltage. This ampliﬁer features a 400MHz 2V signal

P-P

■

Fixed Gain of 2, No External Resistors Required

bandwidth, 2200V/µs slew rate and a unique ability to

drive heavy output loads to 0.8V of the supply rails, mak-

ingtheLT6557idealforasingle5Vsupply,widebandvideo

application. With just one resistor, the inputs of all three

ampliﬁerscanbeprogrammedtoacommonvoltagelevel,

simplifying and reducing the need for external circuitry in

the AC-coupled applications. Without the programmable

resistor,theinputbiascircuitbecomesinactive,allowingthe

use of an external clamp circuit or direct coupled input.

■

AC Coupling with Programmable DC Input Bias

■

Output Swings to 0.8V of Supply Rails

■

Full Video Swing with 5V Single Supply

■

Diff Gain: 0.02%

Diff Phase: 0.05°

Enable/Shutdown Pin

High Output Current: 100mA

Supply Range: 3V to 7.5V

■

Operating Temperature Range: –40°C to 85°C

TheLT6557hasseparatepowersupplyandgroundpinsfor

each ampliﬁer to improve channel separation and to ease

power supply bypassing. The LT6557 provides uncom-

promised performance in many high speed applications

where a low voltage, single supply is required.

■

Available in 16-Lead SSOP and 5mm × 3mm DFN

Packages

APPLICATIONS

■

LCD Video Projectors

The LT6557 is available in 16-lead SSOP and 5mm × 3mm

DFN packages.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

■

RGB HD Video Ampliﬁers

■

Coaxial Cable Drivers

Low Supply ADC Drivers

■

TYPICAL APPLICATION

AC-Coupled Triple Video Driver

BCV

Fast Large-Signal Transient Response

LT6557

412Ω

75Ω

220µF

GND

22µF

IN R

75Ω

IN R

IN G

IN B

–

OUT R

75Ω

500Ω

GND R

22µF

220µF

IN G

75Ω

–

OUT G

75Ω

GND G

22µF

220µF

IN B

75Ω

–

OUT B

75Ω

GND B

6557 TA01a

6557fa

LT6557

ABSOLUTE MAXIMUM RATINGS ^{(Note 1)}

Total Supply Voltage (V to GND)...........................7.5V

Junction Temperature

Input Current........................................................ 10mA

Output Current (Note 2)....................................... 70mA

Output Short-Circuit Duration (Note 2) ............ Indeﬁnite

Operating Temperature Range (Note 3) ... –40°C to 85°C

Speciﬁed Temperature Range (Note 4) .... –40°C to 85°C

SSOP ................................................................ 150°C

DFN................................................................... 125°C

Storage Temperature Range

SSOP ................................................. –65°C to 150°C

DFN.................................................... –65°C to 125°C

Lead Temperature (Soldering, 10 sec)

SSOP ................................................................ 300°C

PACKAGE/ORDER INFORMATION

TOP VIEW

GND

16 BCV

GND

BCV

G=+2

IN R

14 OUT R

IN R

OUT R

GND R

IN G

13 V R

G=+2

GND R

IN G

V R

12 OUT G

OUT G

GND G

IN B

11 V G

GND G

IN B

V G

G=+2

10 OUT B

OUT B

GND B

V B

GND B

DHC PACKAGE

GN PACKAGE

16-LEAD (5mm × 3mm) PLASTIC DFN

16-LEAD PLASTIC SSOP

= 125°C, θ = 40°C/W

EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB

JMAX

= 150°C, θ = 110°C/W

JMAX

ORDER PART NUMBER

GN PART MARKING

ORDER PART NUMBER

LT6557CDHC

LT6557IDHC

DHC PART MARKING*

6557

LT6557CGN

LT6557IGN

6557

6557I

Order Options Tape and Reel: Add #TR

Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

Consult LTC Marketing for parts speciﬁed with wider operating temperature ranges. *The temperature grade is identiﬁed by a label on the shipping container.

ELECTRICAL CHARACTERISTICS ^The

otherwise noted.

●

denotes the speciﬁcations which apply over the full operating

= open, unless

temperature range, otherwise speciﬁcations are at T = 25°C. V = 5V, R = 150Ω to V /2, V = 0.4V, R

BCV

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Offset Voltage

= 1.25V

●

Input Current

= 1.25V

100

µA

Input Resistance

Input Capacitance

= 0.75V to 1.75V, BCV (Pin 6) Open

200

150

kΩ

f = 1MHz

1.5

6557fa

LT6557

ELECTRICAL CHARACTERISTICS ^The

otherwise noted.

●

denotes the speciﬁcations which apply over the full operating

= open, unless

temperature range, otherwise speciﬁcations are at T = 25°C. V = 5V, R = 150Ω to V /2, V = 0.4V, R

BCV

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

A ERR

Gain Error

= 0.75V to 1.75V

0.5

2.5

3.0

●

A MATCH

Gain Match Between Channels

Input Voltage Bias

= 0.75V to 1.75V

0.4

2.75

3.25

IN(DC)

= 348Ω

1.0

0.8

1.25

1.10

1.5

1.7

BCV

PSRR

Power Supply Rejection Ratio

Output Voltage Swing Low

Output Voltage Swing High

Supply Current per Ampliﬁer

Total Supply Current (Disabled)

Enable Pin Current

V = 4V to 6V, V = 1.25V

0.8

0.9

1.0

4.1

4.0

4.2

4.1

= 0.4V, R = ∞, Includes I of V

22.5

25.0

(Pin 15)

= Open, R = ∞

450

1000

µA

= 0.4V

–250

–300

–125

–150

µA

Short-Circuit Current

100

Slew Rate

OUT

= 1.25V to 3.75V (Note 5)

1400

2200

400

500

120

350

V/µs

MHz

–3dB BW

–3dB Bandwidth

= 2V

P-P

= 0.2V

P-P

0.1dB BW

FPBW

Gain Flatness 0.1dB Bandwidth

Full Power Bandwidth

= 2V

P-P

= 2V (Note 6)

220

P-P

XTalk

All Hostile Crosstalk

f = 10MHz, V

= 2V

OUT

–80

–55

OUT

P-P

f = 100MHz, V

= 2V

P-P

Settling Time

To 1%, V

= 1.5V to 3.5V

OUT

To 0.1%

t , t

Rise Time, Fall Time

Differential Gain

10% to 90%, V

NTSC Signal

= 1.5V to 3.5V

875

0.02

0.05

–68

–75

OUT

ΔG

ΔΦ

Differential Phase

Deg

dBc

HD2

HD3

2nd Harmonic Distortion

3rd Harmonic Distortion

f = 10MHz, V = 2V

OUT

P-P

f = 10MHz, V

= 2V

OUT

meet speciﬁed performance from –40°C to 85°C but is not tested or

QA sampled at these temperatures.The LT6557I is guaranteed to meet

speciﬁed performance from –40°C to 85°C.

Note 5: Slew rate is 100% production tested on the R channel and

measured on the rising edge of the output signal. The slew rate of the

falling edge and of the G and B channels is guaranteed through design and

characterization.

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: A heat sink may be required to keep the junction temperature

below the Absolute Maximum Rating.

Note 3: The LT6557C is guaranteed functional over the temperature range

of –40°C and 85°C.

Note 6: Large-signal bandwidth is calculated from slew rate:

FPBW = SR/(π • V

)

P-P

Note 4: The LT6557C is guaranteed to meet speciﬁed performance from

0°C to 70°C. The LT6557C is designed, characterized and expected to

6557fa

LT6557

TYPICAL PERFORMANCE CHARACTERISTICS

Gain Error Distribution

Gain Error Matching Distribution

Voltage Gain vs Temperature

Supply Current per Ampiﬁer

vs Supply Voltage

Supply Current per Ampiﬁer

vs Temperature

Supply Current per Ampiﬁer

vs EN Voltage

= V /2

OUT

SUPPLY VOLTAGE (V)

6557 G04

Input Referred Offset Voltage

vs Temperature

Input Bias Current

vs Input Voltage

EN Pin Current vs EN Pin Voltage

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LT6557

TYPICAL PERFORMANCE CHARACTERISTICS

Output Voltage Swing

vs Load Current (Output High)

Output Voltage Swing

vs Load Current (Output Low)

Output Voltage vs Input Voltage

Input Bias Voltage vs Resistance

at BCV Pin

Bias Control Voltage

vs Temperature

Input Bias Voltage vs Temperature

Frequency Response of Three

Ampliﬁers

Frequency Response

Gain Flatness vs Frequency

6557fa

LT6557

TYPICAL PERFORMANCE CHARACTERISTICS

Frequency Response with

Capacitive Loads

Crosstalk Between Ampliﬁers

vs Frequency

Large-Signal Group Delay

Input Impedance vs Frequency

PSRR vs Frequency

Output Impedance vs Frequency

Input Referred Noise Spectral

Density

Distortion vs Frequency

6557fa

LT6557

TYPICAL PERFORMANCE CHARACTERISTICS

Overdriven Output Recovery

Enable/Disable Response

EN(DISABLE)

OUT

= 5V

= 2V

OUT

P-P

AC COUPLED

= 150

OUT

= 5V

= 2.4V

= 150

P-P

EN(ENABLE)

–1

25 50 75 100 125 150 175 200 225 250

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2

TIME ( s)

TIME (ns)

6557 G28

6557 G29

Large-Signal Transient Response

Small-Signal Transient Response

2.65

2.60

2.55

2.50

2.45

= 5V

= 50mV

= 150

P-P

12 14

16 18 20 22 24

TIME (ns)

6557 G31

PIN FUNCTIONS

EN (Pin 1): Enable Control Pin. The part is enabled when

this pin is pulled low. An internal pull-up resistor of 40k

will turn the part off if this pin is unconnected.

IN G (Pin 5): Green Channel Input. This pin has a nomi-

nal impedance of 200kΩ with input bias circuit inactive,

Pin 16 open.

GND (Pin 2): Ground Reference for Enable Pin (Pin 1)

and Bias Control Voltage Pin (Pin 16). This pin must be

connected externally to ground.

GND G (Pin 6): Ground of Green Channel Ampliﬁer. This

pin is not internally connected to other ground pins and

must be connected externally to ground.

IN R (Pin 3): Red Channel Input. This pin has a nominal

impedance of 200kΩ with input bias circuit inactive,

Pin 16 open.

IN B (Pin 7): Blue Channel Input. This pin has a nominal

impedance of 200kΩ with input bias circuit inactive,

Pin 16 open.

GND R (Pin 4): Ground of Red Channel Ampliﬁer. This pin

is not internally connected to other ground pins and must

be connected externally to ground.

GND B (Pin 8): Ground of Blue Channel Ampliﬁer. This

pin is not internally connected to other ground pins and

must be connected externally to ground.

6557fa

LT6557

PIN FUNCTIONS

V B (Pin 9): Positive Supply Voltage of Blue Channel

the supply voltage bus with proper bypassing for best

performance, see Power Supply Considerations.

Ampliﬁer. This pin is not internally connected to other

supply voltage pins and must be externally connected to

the supply voltage bus with proper bypassing for best

performance, see Power Supply Considerations.

OUT R (Pin 14): Red Channel Output.

V (Pin 15): Positive Supply Voltage of Control Circuitry.

Thispinisnotinternallyconnectedtoothersupplyvoltage

pins and must be externally connected to supply voltage

bus with proper bypassing for best performance, see

Power Supply Considerations.

OUT B (Pin 10): Blue Channel Output.

V G (Pin 11): Positive Supply Voltage of Green Channel

Ampliﬁer. This pin is not internally connected to other

supply voltage pins and must be externally connected to

the supply voltage bus with proper bypassing for best

performance, see Power Supply Considerations.

BCV (Pin 16): Bias Control Voltage. A resistor connected

between Pin 16 and Pin 2 (GND) will generate a DC voltage

bias at the inputs of the three ampliﬁers for AC coupling

application, see Programmable Input Bias.

OUT G (Pin 12): Green Channel Output.

V R (Pin 13): Positive Supply Voltage of Red Channel

Exposed Pad (Pin 17, DFN Package): Ground. This pad

must be soldered to PCB and is internally connected to

GND (Pin 2).

Ampliﬁer. This pin is not internally connected to other

supply voltage pins and must be externally connected to

APPLICATIONS INFORMATION

Power Supply Considerations

The grounds are separately pinned for each ampliﬁer to

minimize crosstalk.

The LT6557 is optimized to provide full video signal swing

output when operated from a standard 5V single supply.

Due to the supply current involved in ultrahigh slew rate

ampliﬁersliketheLT6557,selectionofthelowestworkable

supply voltage is recommended to minimize heat genera-

tion and simplify thermal management. Temperature rise

Operation from split supplies can be accomplished by

connecting the LT6557 ground pins to the negative rail.

Since the ampliﬁer gain is referenced to its ground pins,

the actual signals are referenced to the negative rail, in

this case, and DC coupled applications need to take this

into consideration. With dual supplies, recommended

voltages range from nominal 2.5V to 3.3V.

at the internal devices (T ) must be kept below 150°C

(SSOP package) or 125°C (DFN package), and can be

estimated from the ambient temperature (T ) and power

The ultrahigh frequency (UHF) operating range of the

LT6557 requires that careful printed circuit layout prac-

tices be followed to obtain maximum performance. Trace

lengthsbetweenpowerpinsandbypasscapacitorsshould

be minimized (<0.1 inch) and one or more dedicated

ground planes should be employed to minimize parasitic

inductance. Poor layout or breadboarding methods can

seriously impact ampliﬁer stability, frequency response

and crosstalk performance. A 2.2µF and a 10µF bypass

capacitorisrecommendedfortheLT6557supplybus,plus

a 10nF high frequency bypass capacitor at each individual

power pin.

dissipation (P ) as follows:

T = T + P • 40°C/W for DFN package

T = T + P • 110°C/W for SSOP package

where P = (I + 0.5 • I ) • V

S(TOTAL)

Thelatterequationassumes(conservatively)thattheoutput

swing is small relative to the supply and RMS load current

(I ) is bidirectional (as with AC coupling).

6557fa

LT6557

APPLICATIONS INFORMATION

Programmable Input Bias

no-signal ampliﬁer input bias condition according to the

following relationship:

The LT6557 contains circuitry that provides a user-pro-

grammed bias voltage to the inputs of all three ampliﬁer

sections. The internal biasing feature is designed to mini-

mize external component count in AC-coupled applica-

tions, but may be defeated if external biasing is desired.

Figure 1 shows the simpliﬁed equivalent circuit feeding

the noninverting input of each ampliﬁer. A programming

resistorfromPin16toGND(Pin2)establishesthenominal

_PIN16•9.1k

R_SET

V_BIAS(IN)

where V

= 0.048V typical.

PIN16

For single 5V supply operation, a 400Ω programming

resistor is generally optimal. In applications that demand

maximum ampliﬁer linearity, or if external biasing is

preferred (in DC-coupled applications, for example), the

internal biasing circuitry may be disabled by leaving Pin

16 open. With Pin 16 open, input loading is approximately

200kΩ.

PIN16

I =

SET

2.5k

Shutdown Control

9.1k

The LT6557 may be placed into a shutdown mode, where

allthreeampliﬁersectionsaredeactivatedandpowersup-

ply draw is reduced to approximately 10µA. When the EN

pin is left open, an internal 40k pull-up resistor brings the

6557 F01

Figure 1. Simpliﬁed Programmable Input Bias Circuit Diagram

pin to V and the part enters the shutdown mode. Pulling

the pin more than approximately 1.5V below V will en-

able the LT6557 (see Figure 2 for equivalent circuit). The

pull-down current required to activate the part is typically

125µA. In most applications, the EN pin is simply con-

nected to ground (for continuous operation) or driven

directly by a CMOS-level logic gate (see Figure 3 for

examples). Response time is typically 50ns for enabling,

and 1µs for shutdown. In shutdown mode, the feedback

resistors remain connected between the output pins and

40k

BIAS

CIRCUITRY

–

the individual ground (or V connected) pins.

Figure 2. Simpliﬁed Shutdown Circuit Diagram

LT6557

DISABLE

6557 F03

(3a) Open Drain or Open Collector

(3b) CMOS Gate with Shared Supply

Figure 3. Suitable Shutdown Pin Drive Circuits

6557fa

LT6557

SIMPLIFIED SCHEMATIC

BIAS

OUT

500Ω

6557 SS

PACKAGE DESCRIPTION

GN Package

16-Lead Plastic SSOP (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1641)

.189 – .196*

(4.801 – 4.978)

.045 .005

.009

(0.229)

REF

16 15 14 13 12 11 10 9

.254 MIN

.150 – .165

.229 – .244

.150 – .157**

(5.817 – 6.198)

(3.810 – 3.988)

.0165 .0015

.0250 BSC

RECOMMENDED SOLDER PAD LAYOUT

.015 .004

(0.38 0.10)

× 45°

.0532 – .0688

(1.35 – 1.75)

.004 – .0098

(0.102 – 0.249)

.007 – .0098

(0.178 – 0.249)

0° – 8° TYP

.016 – .050

(0.406 – 1.270)

.0250

(0.635)

BSC

.008 – .012

GN16 (SSOP) 0204

(0.203 – 0.305)

TYP

NOTE:

1. CONTROLLING DIMENSION: INCHES

INCHES

2. DIMENSIONS ARE IN

(MILLIMETERS)

3. DRAWING NOT TO SCALE

*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH

SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE

**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD

FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

6557fa

LT6557

PACKAGE DESCRIPTION

DHC Package

16-Lead Plastic DFN (5mm × 3mm)

(Reference LTC DWG # 05-08-1706)

0.65 0.05

3.50 0.05

1.65 0.05

2.20 0.05 (2 SIDES)

PACKAGE

OUTLINE

0.25 0.05

0.50 BSC

4.40 0.05

(2 SIDES)

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

R = 0.115

TYP

0.40 0.10

5.00 0.10

(2 SIDES)

R = 0.20

TYP

3.00 0.10 1.65 0.10

(2 SIDES)

PIN 1

TOP MARK

(SEE NOTE 6)

PIN 1

NOTCH

(DHC16) DFN 1103

0.25 0.05

0.50 BSC

0.75 0.05

0.200 REF

4.40 0.10

(2 SIDES)

0.00 – 0.05

BOTTOM VIEW—EXPOSED PAD

NOTE:

1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDEC

PACKAGE OUTLINE MO-229

2. DRAWING NOT TO SCALE

3. ALL DIMENSIONS ARE IN MILLIMETERS

4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE

MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE

5. EXPOSED PAD SHALL BE SOLDER PLATED

6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE

TOP AND BOTTOM OF PACKAGE

6557fa

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

LT6557

TYPICAL APPLICATION

Split Supply Operation with DC Bias Servo

RELATED PARTS

PART NUMBER

DESCRIPTION

COMMENTS

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110MHz Gain of 2 Buffers in MS Package

Optimized for Driving 75Ω Cables

LT1675

LT6550/LT6551

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3.3V Triple and Quad Video Buffers

650MHz Gain of 2 Triple Video Ampliﬁer

650MHz Gain of 1 Triple Video Ampliﬁer

650MHz Gain of 2 Triple Video Multiplexer

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LT6554

Performance Similar to the LT6553 with A = 1, 16-Lead SSOP

LT6555

Optimized for Driving 75Ω Cables

LT6556

High Slew Rate 2100V/µs

LT6558

550MHz, 2200V/µs Gain of 1 Triple Video Ampliﬁer Single Supply with Input Bias Control

6557fa

LT/LWI 0606 • REV A • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

●

(408) 432-1900 FAX: (408) 434-0507 www.linear.com

LT6557CGN [Linear]

相关型号：

LT6557CGN#PBF

LT6557CGN#TR

LT6557CGN#TRPBF

LT6557IDHC

LT6557IDHC#PBF

LT6557IGN

LT6557IGN#TR

LT6557IGN#TRPBF

LT6558

LT6558CDHC

LT6558CGN

LT6558CGN#PBF