LT6557 LINER [Linear Technology], LT6557 Datasheet

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LT6557

Manufacturer Part Number
LT6557
Description
500MHz, 2200V/?s Gain of 2, Single Supply Triple Video Amplifi er with Input Bias Control
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
APPLICATIONS
TYPICAL APPLICATION
–3dB Small-Signal Bandwidth: 500MHz
–3dB 2V
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
LCD Video Projectors
RGB HD Video Amplifi ers
Coaxial Cable Drivers
Low Supply ADC Drivers
IN R
IN G
IN B
75Ω
75Ω
75Ω
22µF
22µF
22µF
P-P
EN
GND
IN R
GND R
IN G
GND G
IN B
GND B
AC-Coupled Triple Video Driver
Large-Signal Bandwidth: 400MHz
500Ω
500Ω
500Ω
LT6557
+
+
+
500Ω
500Ω
500Ω
OUT R
OUT G
OUT B
V
V
V
BCV
+
+
+
V
R
G
B
+
6557 TA01a
75Ω
75Ω
75Ω
5V
5V
5V
5V
220µF
220µF
220µF
Amplifi er with Input Bias Control
412Ω
75Ω
75Ω
75Ω
500MHz, 2200V/µs Gain of 2,
DESCRIPTION
The LT
internal fi xed gain of 2 and a programmable DC input bias
voltage. This amplifi er features a 400MHz 2V
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.
All other trademarks are the property of their respective owners.
Single Supply Triple Video
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
®
6557 is a high speed triple video amplifi er with an
Fast Large-Signal Transient Response
LT6557
P-P
signal
6557fa
1

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LT6557 Summary of contents

Page 1

... 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 ...

Page 2

... OUT EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB ORDER PART NUMBER 6557 LT6557CDHC 6557I LT6557IDHC The denotes the specifi cations which apply over the full operating ● = 25° 5V 150Ω CONDITIONS V = 1.25V ...

Page 3

... Absolute Maximum Rating. Note 3: The LT6557C is guaranteed functional over the temperature range of –40°C and 85°C. Note 4: The LT6557C is guaranteed to meet specifi ed performance from 0°C to 70°C. The LT6557C is designed, characterized and expected to The denotes the specifi cations which apply over the full operating ● ...

Page 4

... LT6557 TYPICAL PERFORMANCE CHARACTERISTICS Gain Error Distribution Supply Current per Ampifi Supply Voltage OUT SUPPLY VOLTAGE (V) 6557 G04 EN Pin Current vs EN Pin Voltage 4 Gain Error Matching Distribution Supply Current per Ampifi er ...

Page 5

... Input Bias Voltage vs Resistance at BCV Pin Frequency Response Output Voltage Swing vs Load Current (Output High) Input Bias Voltage vs Temperature Frequency Response of Three Amplifi ers LT6557 Output Voltage Swing vs Load Current (Output Low) Bias Control Voltage vs Temperature Gain Flatness vs Frequency 6557fa 5 ...

Page 6

... LT6557 TYPICAL PERFORMANCE CHARACTERISTICS Frequency Response with Capacitive Loads Output Impedance vs Frequency Distortion vs Frequency 6 Large-Signal Group Delay Input Impedance vs Frequency Distortion vs Frequency Crosstalk Between Amplifi ers vs Frequency PSRR vs Frequency Input Referred Noise Spectral Density 6557fa ...

Page 7

... IN B (Pin 7): Blue Channel Input. This pin has a nominal impedance of 200kΩ with input bias circuit inactive, Pin 16 open. GND B (Pin 8): Ground of Blue Channel Amplifi er. This pin is not internally connected to other ground pins and must be connected externally to ground. LT6557 V EN(DISABLE ...

Page 8

... APPLICATIONS INFORMATION Power Supply Considerations 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 amplifi ers like the LT6557, selection of the lowest workable supply voltage is recommended to minimize heat genera- tion and simplify thermal management ...

Page 9

... PIN16 SET 200kΩ. Shutdown Control The LT6557 may be placed into a shutdown mode, where 9.1k all three amplifi er sections are deactivated and power sup- ply draw is reduced to approximately 10µA. When the EN pin is left open, an internal 40k pull-up resistor brings the + pin to V the pin more than approximately 1 ...

Page 10

... LT6557 SIMPLIFIED SCHEMATIC EN BIAS IN PACKAGE DESCRIPTION .254 MIN .0165 ± .0015 RECOMMENDED SOLDER PAD LAYOUT .007 – .0098 (0.178 – 0.249) .016 – .050 (0.406 – 1.270) 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" ...

Page 11

... Plastic DFN (5mm × 3mm) (Reference LTC DWG # 05-08-1706) 0.65 ±0.05 PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 4.40 ±0.05 (2 SIDES) 5.00 ±0.10 (2 SIDES 0.20 TYP 1.65 ± 0.10 3.00 ±0.10 (2 SIDES) (2 SIDES) 0.75 ±0.05 0.00 – 0.05 LT6557 R = 0.115 0.40 ± 0.10 TYP 9 16 PIN 1 NOTCH (DHC16) DFN 1103 8 1 0.25 ± 0.05 0.50 BSC 4.40 ±0.10 (2 SIDES) BOTTOM VIEW—EXPOSED PAD 6557fa 11 ...

Page 12

... LT6557 TYPICAL APPLICATION RELATED PARTS PART NUMBER DESCRIPTION LT1399 300MHz Triple Current Feedback Amplifi er LT1675 250MHz Triple RGB Multiplexer LT6550/LT6551 3.3V Triple and Quad Video Buffers LT6553 650MHz Gain of 2 Triple Video Amplifi er LT6554 650MHz Gain of 1 Triple Video Amplifi er ...

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