Datasheet

ManualsBrandsLINEAR TECHNOLOGY ManualsLinear ICsLinear IC - Amplifier - Video buffering 650 MHz SSOP 16

LT6553

6553f

APPLICATIO S

DESCRIPTIO

FEATURES

TYPICAL APPLICATIO

152

161

–5V

–

370Ω 370Ω

75Ω

–

370Ω 370Ω

75Ω

–

–5V

370Ω370Ω

75Ω

LT6553

6553 TA01a

The LT

6553 is a high-speed triple video amplifier with an

internally fixed gain of 2. The individual amplifiers are

optimized for performance with a double terminated 75Ω

video load and feature a 2V

P–P

full signal bandwidth of

400MHz, making them ideal for driving very high-resolu-

tion video signals. Separate power supply pins for each

amplifier boost channel separation to 75dB, allowing the

LT6553 to excel in many high-speed applications.

While the performance of the LT6553 is optimized for dual

supply operation, it can also be used on a single supply as

small as 4.5V. Using dual 5V supplies, each amplifier

draws only 8mA. When disabled, the amplifiers draw less

than 100µA and the output pins become high impedance.

Furthermore, the amplifiers are capable of turning on in

less than 50ns, making them ideal for multiplexing and

portable applications.

The LT6553 is manufactured on Linear Technology’s

proprietary low voltage complementary bipolar process

and is available in the 16-lead SSOP package that fits in the

same PCB area as an SO-8 package.

■

RGB Amplifiers

■

Coaxial Cable Drivers

■

LCD Projectors

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

■

650MHz –3dB Small Signal Bandwidth

■

400MHz –3dB 2V

P-P

Large Signal Bandwidth

■

150MHz ±0.1dB Bandwidth

■

High Slew Rate: 2500V/µs

■

Fixed Gain of 2 Requires No External Resistors

■

75dB Channel Separation at 10MHz

■

50dB Channel Separation at 100MHz

■

–82dBc 2nd Harmonic Distortion at 10MHz, 2V

P-P

■

–72dBc 3rd Harmonic Distortion at 10MHz, 2V

P-P

■

Low Supply Current: 8mA per Amplifier

■

6ns 0.1% Settling Time for 2V Step

■

TTL Compatible Enable I

≤ 100µA when Disabled

■

Differential Gain of 0.022%, Differential

Phase of 0.006°

■

Wide Supply Range: ±2.25V (4.5V) to ±6V (12V)

■

Available in 16-Lead SSOP Package

650MHz Gain of 2

Triple Video Amplifier

Triple Video Line Driver

TIME (ns)

OUTPUT (V)

1.5

1.0

0.5

–0.5

–1.0

–1.5

4 8 12 16

6553 TA01b

2020 6 10 14 18

= 1V

P–P

= ±5V

= 15OΩ

= 25°C

Large Signal Transient Response

Summary of content (12 pages)

PAGE 1
LT6553 650MHz Gain of 2 Triple Video Amplifier U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 650MHz –3dB Small Signal Bandwidth 400MHz –3dB 2VP-P Large Signal Bandwidth 150MHz ±0.1dB Bandwidth High Slew Rate: 2500V/µs Fixed Gain of 2 Requires No External Resistors 75dB Channel Separation at 10MHz 50dB Channel Separation at 100MHz –82dBc 2nd Harmonic Distortion at 10MHz, 2VP-P –72dBc 3rd Harmonic Distortion at 10MHz, 2VP-P Low Supply Current: 8mA per Amplifier 6ns 0.
PAGE 2
LT6553 U W W W ABSOLUTE AXI U RATI GS U W U PACKAGE/ORDER I FOR ATIO (Note 1) Total Supply Voltage (V+ to V–) ............................ 13.2V Input Current (Note 2) ........................................ ±10mA Output Current (Continuous) ............................. ±70mA EN to DGND Voltage (Note 2) ................................. 5.5V Output Short-Circuit Duration (Note 3) ............ Indefinite Operating Temperature Range (Note 4) ... –40°C to 85°C Specified Temperature Range (Note 5) ...
PAGE 3
LT6553 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, CL = 1.5pF, VEN = 0.4V, VAGND, VDGND = 0V.
PAGE 4
LT6553 U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current per Amplifier vs Temperature SUPPLY CURRENT (mA) VEN = 0V 8 VEN = 0.4V 6 V– = –V+ VEN, VDGND, VIN = 0V 10 TA = 25°C 4 2 8 6 4 0 5 25 45 65 85 105 125 TEMPERATURE (°C) 1 0 2 VS = ±5V VIN = 0V VS = ±5V –2.5 –5.0 0 EN PIN CURRENT (µA) 0 TA = 125°C –20 TA = 25°C TA = –55°C –40 4.0 VS = ±5V VDGND = 0V –40 TA = 125°C –60 TA = –55°C –80 TA = 25°C –100 –120 –7.5 –10.0 –55 –35 –15 –60 –2.
PAGE 5
LT6553 U W TYPICAL PERFOR A CE CHARACTERISTICS Input Noise Spectral Density Input Impedance vs Frequency 1000 VS = ±5V TA = 25°C en in 10 VS = ±5V VIN = 0V TA = 25°C 10 1 VS = ±5V TA = 25°C ±PSRR 60 50 –PSRR 40 +PSRR 30 20 10 1 0.001 0.01 0.1 1 FREQUENCY (kHz) 10 0.1 0.01 100 0.1 1 10 FREQUENCY (MHz) 100 Frequency Response vs Output Amplitude 8 7 Gain Flatness vs Frequency 0.5 VS = ±5V RL = 150Ω TA = 25°C 0.4 VOUT = 2VP-P 0.
PAGE 6
LT6553 U W TYPICAL PERFOR A CE CHARACTERISTICS Video Amplitude Transient Response Small Signal Transient Response 4 VOUT = 700mVP–P 0.8 VS = ±5V RL = 150Ω 0.7 T = 25°C A VIN = 100mVP–P VS = ±5V 0.10 RL = 150Ω TA = 25°C 3 2 OUTPUT (V) 0 –0.05 OUTPUT (V) 0.6 0.05 OUTPUT (V) Large Signal Transient Response 0.9 0.15 0.5 0.4 0.3 0 –1 –2 0.1 –3 0 –0.1 2 4 6 8 10 12 14 16 18 20 TIME (ns) 0 2 4 6 Large Signal Transient Response PERCENT OF UNITS (%) 40 0 –0.
PAGE 7
LT6553 U U U PI FU CTIO S EN (Pin 1): Enable Control Pin. An internal pull-up resistor of 46k defines the pin’s impedance and will turn the part off if the pin is unconnected. When the pin is pulled low, the part is enabled. DGND (Pin 2): Digital Ground Reference for Enable Pin. This pin is normally connected to ground. INR (Pin 3): Red Channel Input. This pin has a nominal impedance of 400kΩ and does not have any internal termination resistor.
PAGE 8
LT6553 U W U U APPLICATIO S I FOR ATIO Power Supplies The LT6553 is optimized for ±5V supplies but can be operated on as little as ±2.25V or a single 4.5V supply and as much as ±6V or a single 12V supply. Internally, each supply is independent to improve channel isolation. Do not leave any supply pins disconnected or the part may not function correctly! Enable/Shutdown The LT6553 has a TTL compatible shutdown mode controlled by the EN pin and referenced to the DGND pin.
PAGE 9
LT6553 U W U U APPLICATIO S I FOR ATIO If the AGND pins are not connected directly to a low impedance ground plane, they must be carefully bypassed to maintain minimal impedance over frequency. Pin 6 is a shared connection of the gain resistors of both channel G and channel B, and any resistance external to this node can significantly decrease the isolation between those channels.
PAGE 10
LT6553 U TYPICAL APPLICATIO S A fourth signal trace is provided at the bottom of the DC714 demo board with dimensions identical to the combined input and output of the other channels. This trace can be used for calibrating the effects of electrical delay and impedance mismatching and is not necessary in an end-user application. Several jumpers and additional connectors are also included to allow for testing of the enable feature and single supply operation.
PAGE 11
LT6553 W W SI PLIFIED SCHE ATIC V+ V+ TO OTHER AMPLIFIERS BIAS AGND 370Ω V+ 46k 150Ω 1k EN 370Ω IN OUT V– DGND V– 6553 SS V– U PACKAGE DESCRIPTIO 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 TYP RECOMMENDED SOLDER PAD LAYOUT 1 .015 ± .004 × 45° (0.38 ± 0.10) .007 – .
PAGE 12
LT6553 U TYPICAL APPLICATIO 3.3V NC7SZ14 1 LT6553 3 R1 ×2 5 ×2 7 75Ω 75Ω 75Ω ×2 LT6553 3 ×2 G0 ×2 7 75Ω 75Ω 75Ω B 16 14 12 11 6 B0 75Ω 10 13 4 5 G 15 2 R0 75Ω 12 9 8 1 SEL R 11 6 B1 75Ω 14 13 4 G1 16 15 2 ×2 8 10 9 NOTE: POWER SUPPLY BYPASS CAPACITORS NOT SHOWN FOR CLARITY –3.3V 6553 F03 Figure 3.