Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsLinear ICsLinear IC - Amplifier - Video buffering Rail-to-rail 90 MHz MSOP 10

LT6550/LT6551

65501fa

FEATURES

APPLICATIO S

DESCRIPTIO

TYPICAL APPLICATIO

■

Automotive Displays

■

LCD and CRT Compatible

■

RGB Amplifiers

■

Coaxial Cable Drivers

■

Low Voltage High Speed Signal Processing

■

Set Top Boxes

■

Single Supply Operation from 3V to 12.6V

■

Small (3mm × 5mm) MSOP 10-Lead Package

■

Internal Resistors for a Gain of Two

■

340V/µs Slew Rate

■

110MHz –3dB Bandwidth

■

30MHz Flat to 0.25dB

■

3% Settling Time: 20ns

■

Input Common Mode Range Includes Ground

■

Rail-to-Rail Output

■

High Output Drive: 60mA

■

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

■

24-Bit RGB

3.3V Triple and Quad

Video Amplifiers

The LT

6550/LT6551 are 3.3V triple and quad high speed

video amplifiers. These voltage feedback amplifiers drive

double terminated 50Ω or 75Ω cables and are configured

for a fixed gain of 2, eliminating six or eight external gain

setting resistors. The LT6550/LT6551 feature 110MHz

–3dB bandwidth, high slew rates and fast settling, making

them ideal for RGB video processing.

The LT6551 quad is designed for single supply operation

and the LT6550 triple can be used on either single or split

supplies. On a single 3.3V supply, the input voltage range

extends from ground to 1.55V and the output swings to

within 400mV of the supply voltage while driving a 150Ω

load. These features, combined with the ability to accept

RGB video signals without the need for AC coupling or

level shifting of the incoming signals, make the LT6550/

LT6551 an ideal choice for low voltage video applications.

Both the LT6550 and LT6551 are available in the small

10-Pin MSOP package and utilize a flow-thru pin out. The

small footprint results in a compact high performance

video amplifier solution.

–

OUT

3.3V

450Ω 450Ω

75Ω

–

OUT

450Ω 450Ω

75Ω

–

OUT

450Ω 450Ω

75Ω

–

SYNC

OUT

SYNC

GND

450Ω 450Ω

75Ω

LT6551

6551 TA01a

OUT

= 3.3V

= 0.5V TO 1.25V

f = 10MHz

6550/51 TA01b

3.3V Single Supply LT6551 RGB Plus SYNC Cable Driver

Output Step Response

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

All other trademarks are the property of their respective owners.

Summary of content (16 pages)

PAGE 1
LT6550/LT6551 3.3V Triple and Quad Video Amplifiers U FEATURES DESCRIPTIO ■ The LT®6550/LT6551 are 3.3V triple and quad high speed video amplifiers. These voltage feedback amplifiers drive double terminated 50Ω or 75Ω cables and are configured for a fixed gain of 2, eliminating six or eight external gain setting resistors. The LT6550/LT6551 feature 110MHz –3dB bandwidth, high slew rates and fast settling, making them ideal for RGB video processing.
PAGE 2
LT6550/LT6551 W W U W ABSOLUTE AXI U RATI GS (Note 1) Total Supply Voltage LT6550 (VCC TO VEE) ........................................ 12.6V LT6551 (VCC TO GND) ...................................... 12.6V Input Current (Note 9) ........................................ ±10mA Output Short-Circuit Duration (Note 2) ............ Indefinite Operating Temperature Range ................ – 40°C to 85°C Specified Temperature Range (Note 3) LT6550C/LT6551C ..............................
PAGE 3
LT6550/LT6551 3.3V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C. VCC = 3.3V, VGND = 0V; VIN = 0.75V LT6550 (Pins 1,2,3); LT6551 (Pins 1,2,3,4). VEE = 0V LT6550 (Pin 5), unless otherwise noted. PARAMETER Output Voltage Swing High PSRR CONDITIONS VIN = 1.75V No Load RL = 150Ω RL = 75Ω VCC = 3V to 10V, VIN = 0.5V Minimum Supply Voltage (Note 6) Output Short-Circuit Current MIN TYP ● ● 3.0 2.5 2.
PAGE 4
LT6550/LT6551 5V ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, VGND = 0V; VIN = 1.25V LT6550 (Pins 1,2,3); LT6551 (Pins 1,2,3,4). VEE = 0V LT6550 (Pin 5), unless otherwise noted. PARAMETER CONDITIONS PSRR VCC = 3V to 10V, VIN = 0.
PAGE 5
LT6550/LT6551 ±5V ELECTRICAL CHARACTERISTICS (LT6550 Only) The ● denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, VIN = 0V (Pins 1,2,3) VGND = 0V (Pin 4) unless otherwise noted. PARAMETER CONDITIONS MIN Supply Current per Amplifier TYP MAX UNITS 8.5 10.5 12 mA mA ● Slew Rate RL = 150Ω, VOUT = –3V to 3V, Measured from –2V to 2V 400 300 ● Small Signal –3dB Bandwidth RL = 150Ω Gain Flatness Less than 0.
PAGE 6
LT6550/LT6551 U W 5V/3.3V TYPICAL PERFOR A CE CHARACTERISTICS VEE (Pin 5) = 0V (LT6550), GND (Pin 5) = 0V (LT6551) Input Bias Current vs Input Voltage 0 –5 –5 TA = 125°C –10 TA = 25°C –15 TA = –55°C –20 TA = 125°C –10 –15 TA = 25°C –20 TA = –55°C –25 0 0.2 0.4 0.6 0.8 1.0 1.2 INPUT VOLTAGE (V) –30 1.4 1.6 0 0.5 1.0 1.5 INPUT VOLTAGE (V) Output Saturation Voltage vs Load Current (Output Low) TA = 25°C TA = –55°C 0.01 0.01 1 0.
PAGE 7
LT6550/LT6551 U W 5V/3.3V TYPICAL PERFOR A CE CHARACTERISTICS VEE (Pin 5) = 0V (LT6550), GND (Pin 5) = 0V (LT6551) Frequency Response with Capacitive Loads Capacitive Load Handling, Overshoot vs Capacitive Load GAIN (dB) 9 CL = 150pF CL = 50pF 7 6 CL = 10pF 5 RL = OPEN 30 25 RL = 150Ω 20 15 4 10 3 5 2 10k 1M 10M FREQUENCY (Hz) 10 100M 500M VS = 5V, 0V VOUT = 2.
PAGE 8
LT6550/LT6551 U W 5V/3.3V TYPICAL PERFOR A CE CHARACTERISTICS VEE (Pin 5) = 0V (LT6550), GND (Pin 5) = 0V (LT6551) Large Signal Response 6550/51 G22 CL = 20pF VS = 5V, 0V VOUT = 0.5V TO 3.
PAGE 9
LT6550/LT6551 ±5V TYPICAL PERFOR A CE CHARACTERISTICS (LT6550 Only) U W VGND (Pin 4) = 0V 12 11 –0.2 6.0 5.9 10 –0.4 –0.6 1M 10M FREQUENCY (Hz) –1.
PAGE 10
LT6550/LT6551 W BLOCK DIAGRA S LT6551 Block Diagram LT6550 Block Diagram 450Ω 450Ω 450Ω IN1 VCC VCC – OA + – OA + 450Ω 450Ω IN1 OUT1 450Ω 450Ω OUT1 450Ω IN2 IN2 – OA + – OA + 450Ω OUT2 450Ω 450Ω OUT2 450Ω IN3 IN3 – OA + – OA + OUT3 450Ω OUT3 450Ω IN4 GND – OA + N/C VEE 6550 BD01 GND OUT4 6551 BD02 65501fa 10
PAGE 11
LT6550/LT6551 U U W U APPLICATIO S I FOR ATIO Amplifier Characteristics Figure 1 shows a simplified schematic of one channel of the LT6551 quad. Resistors RF and RG provide an internal gain of 2. (The LT6550 triple is a slight variation with the gain setting resistor, RG, connected to a separate ground pin). The input stage consists of transistors Q1 to Q8 and resistor R1. This topology allows for high slew rates at low supply voltages.
PAGE 12
LT6550/LT6551 U W U U APPLICATIO S I FOR ATIO Power Dissipation The dissipation for the amplifiers is: The LT6550/LT6551, enhanced θJA MS package, has Pin 5 (VEE for the LT6550 and GND for the LT6551) fused to the lead frame. This thermal connection increases the efficiency of the PC board as a heat sink. The PCB material can be very effective at transmitting heat between the pad area attached to Pin 5 and a ground or power plane layer.
PAGE 13
LT6550/LT6551 U TYPICAL APPLICATIO S Video Splitter 470µF 4k 1 LUMINANCE 75Ω LT6551 450Ω 10 1k – OA + 2 450Ω 3 75Ω 450Ω 1k 5 450Ω LUMINANCE OUT1 8 75Ω 450Ω S-VIDEO CONNECTOR – OA + 4 LUMINANCE OUT2 450Ω 4k CHROMA VCC = 5V 9 75Ω – OA + VCC = 5V 470µF 450Ω CHROMA OUT1 7 75Ω OUT1 450Ω – OA + 6 75Ω S-VIDEO CHROMA CONNECTOR OUT2 6551 TA02 OUT2 65501fa 13
PAGE 14
LT6550/LT6551 U TYPICAL APPLICATIO Consumer products require generation of YPBPR luminance/chrominance component signals, often from RGB source content. The YPBPR format has a luminance signal and two weighted color difference signals at baseband. Even with their fixed internal gain resistors, two LT6550s connected as shown easily implement the required conversion matrix equations.
PAGE 15
LT6550/LT6551 U PACKAGE DESCRIPTIO MS Package 10-Lead Plastic MSOP (Reference LTC DWG # 05-08-1661) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.50 0.305 ± 0.038 (.0197) (.0120 ± .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 0.497 ± 0.076 (.0196 ± .003) REF 10 9 8 7 6 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .006) DETAIL “A” 0° – 6° TYP GAUGE PLANE 1 2 3 4 5 0.53 ± 0.152 (.021 ± .006) DETAIL “A” 1.10 (.
PAGE 16
LT6550/LT6551 U TYPICAL APPLICATIO 10MHz Reference Distribution Amplifier LT6551 450Ω 450Ω 4.53k 10MHz LABORATORY FREQUENCY REFERENCE (4dBm MAX) 50Ω 10 – 10nF 1 + 450Ω 1k OA 50Ω + 450Ω OA OA 7 50Ω 10nF 450Ω – 4 10nF 450Ω + 450Ω 8 50Ω – 3 10nF 450Ω – 2 VCC = 3.