Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsLinear ICsLinear IC - Amplifier - Video buffering 500 MHz SSOP 16

LT6557

6557fa

500MHz, 2200V/µs Gain of 2,

Single Supply Triple Video

Ampliﬁ er with Input Bias Control

The LT

6557 is a high speed triple video ampliﬁ er with an

internal ﬁ xed gain of 2 and a programmable DC input bias

voltage. This ampliﬁ er features a 400MHz 2V

P-P

signal

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

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

ing the LT6557 ideal for a single 5V supply, wideband video

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

ampliﬁ ers can be programmed to a common voltage level,

simplifying and reducing the need for external circuitry in

the AC-coupled applications. Without the programmable

resistor, the input bias circuit becomes inactive, allowing the

use of an external clamp circuit or direct coupled input.

The LT6557 has separate power supply and ground pins for

each ampliﬁ er 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.

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

DFN packages.

■

LCD Video Projectors

■

RGB HD Video Ampliﬁ ers

■

Coaxial Cable Drivers

■

Low Supply ADC Drivers

■

–3dB Small-Signal Bandwidth: 500MHz

■

–3dB 2V

P-P

Large-Signal Bandwidth: 400MHz

■

Slew Rate: 2200V/µs

■

Fixed Gain of 2, No External Resistors Required

■

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

■

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

Packages

AC-Coupled Triple Video Driver

–

500Ω

IN R

GND

IN R

OUT R

BCV

LT6557

GND R

75Ω

412Ω

6557 TA01a

22µF

500Ω

75Ω

220µF

–

500Ω

IN G

OUT G

GND G

75Ω

22µF

500Ω

75Ω

220µF

–

500Ω

IN B

OUT B

GND B

75Ω

22µF

500Ω

75Ω

220µF

Fast Large-Signal Transient Response

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Summary of content (12 pages)

PAGE 1
LT6557 500MHz, 2200V/µs Gain of 2, Single Supply Triple Video Amplifier with Input Bias Control FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ DESCRIPTION –3dB Small-Signal Bandwidth: 500MHz –3dB 2VP-P Large-Signal Bandwidth: 400MHz Slew Rate: 2200V/µs Fixed Gain of 2, No External Resistors Required 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.
PAGE 2
LT6557 ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (VS+ to GND) ...........................7.5V 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 Junction Temperature SSOP ............................................................
PAGE 3
LT6557 ELECTRICAL CHARACTERISTICS The ● denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TA = 25°C. VS = 5V, RL = 150Ω to VS/2, VEN = 0.4V, RBCV = open, unless otherwise noted. SYMBOL PARAMETER CONDITIONS AV ERR Gain Error VIN = 0.75V to 1.
PAGE 4
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 Input Referred Offset Voltage vs Temperature Input Bias Current vs Input Voltage 50 VOUT = VS/2 45 SUPPLY CURRENT (mA) 40 35 30 25 20 15 10 5 0 0 1 2 6 3 4 5 SUPPLY VOLTAGE (V) 7 8 6557 G04 EN Pin Current vs EN Pin Voltage 6557fa 4
PAGE 5
LT6557 TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage vs Input Voltage Output Voltage Swing vs Load Current (Output High) Output Voltage Swing vs Load Current (Output Low) Input Bias Voltage vs Resistance at BCV Pin Input Bias Voltage vs Temperature Bias Control Voltage vs Temperature Frequency Response Frequency Response of Three Ampliﬁers Gain Flatness vs Frequency 6557fa 5
PAGE 6
LT6557 TYPICAL PERFORMANCE CHARACTERISTICS Frequency Response with Capacitive Loads Output Impedance vs Frequency Distortion vs Frequency Large-Signal Group Delay Input Impedance vs Frequency Distortion vs Frequency Crosstalk Between Ampliﬁers vs Frequency PSRR vs Frequency Input Referred Noise Spectral Density 6557fa 6
PAGE 7
LT6557 TYPICAL PERFORMANCE CHARACTERISTICS Overdriven Output Recovery Enable/Disable Response 6 5 VEN(DISABLE) 5 VOUT 4 VS = 5V VOUT = 2VP-P AC COUPLED RL = 150W 4 VOLTAGE (V) VIN = 0.5V/DIV, VOUT = 1V/DIV VIN 3 2 3 2 VOUT 1 1 0 VS = 5V VIN = 2.4VP-P RL = 1509 0 0 VEN(ENABLE) –1 25 50 75 100 125 150 175 200 225 250 TIME (ns) 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 TIME (ms) 6557 G28 6557 G29 Large-Signal Transient Response Small-Signal Transient Response 2.
PAGE 8
LT6557 PIN FUNCTIONS V+ B (Pin 9): Positive Supply Voltage of Blue 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. OUT B (Pin 10): Blue Channel Output. V+ G (Pin 11): Positive Supply Voltage of Green Channel Ampliﬁer.
PAGE 9
LT6557 APPLICATIONS INFORMATION Programmable Input Bias The LT6557 contains circuitry that provides a user-programmed bias voltage to the inputs of all three ampliﬁer sections. The internal biasing feature is designed to minimize external component count in AC-coupled applications, but may be defeated if external biasing is desired. Figure 1 shows the simpliﬁed equivalent circuit feeding the noninverting input of each ampliﬁer.
PAGE 10
LT6557 SIMPLIFIED SCHEMATIC V+ EN BIAS OUT IN 500Ω 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 16 15 14 13 12 11 10 9 .254 MIN .009 (0.229) REF .150 – .165 .229 – .244 (5.817 – 6.198) .0165 ± .0015 .150 – .157** (3.810 – 3.988) .0250 BSC RECOMMENDED SOLDER PAD LAYOUT 1 .015 ± .004 × 45° (0.38 ± 0.10) .007 – .0098 (0.178 – 0.249) .0532 – .0688 (1.35 – 1.75) 2 3 4 5 6 7 8 .
PAGE 11
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 5.00 ±0.10 (2 SIDES) R = 0.20 TYP 3.00 ±0.10 (2 SIDES) 9 0.40 ± 0.10 16 1.65 ± 0.10 (2 SIDES) PIN 1 TOP MARK (SEE NOTE 6) PIN 1 NOTCH (DHC16) DFN 1103 8 0.200 REF 1 0.25 ± 0.05 0.50 BSC 0.75 ±0.05 4.40 ±0.10 (2 SIDES) 0.
PAGE 12
LT6557 TYPICAL APPLICATION Split Supply Operation with DC Bias Servo RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1399 300MHz Triple Current Feedback Ampliﬁer 0.1dB Gain Flatness to 150MHz, Shutdown LT1675 250MHz Triple RGB Multiplexer 100MHz Pixel Switching, 1100V/µs Slew Rate, 16-Lead SSOP LT6550/LT6551 3.