Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsInterface ICsInterface IC - multiplexers SSOP 16

LMH6572

Triple 2:1 High Speed Video Multiplexer

General Description

The LMH

™

6572 is a high performance analog mulitplexer

optimized for professional grade video and other high fidelity

high bandwidth analog applications. The LMH6572 provides

a 290MHz bandwidth at 2 V

output signal levels. The 140

MHz of .1 dB bandwidth and a 1500 V/µs slew rate make this

part suitable for High Definition Television (HDTV) and High

Resolution Multimedia Video applications.

The LMH6572 supports composite video applications with its

0.02% and 0.02˚ differential gain and phase errors for NTSC

and PAL video signals while driving a single, back terminated

75Ω load. The LMH6572 can deliver 80 mA linear output

current for driving multiple video load applications.

The LMH6572 has an internal gain of two for driving back

terminated transmission lines at a net gain of one.

The LMH6572 is available in the SSOP package.

Features

n 350 MHz, 250 mV −3 dB bandwidth

n 290 MHz, 2 V

−3 dB bandwidth

n 10 ns channel switching time

n 90 dB channel to channel isolation

5 MHz

n 0.02%, 0.02˚ diff. gain, phase

n .1 dB gain flatness to 140 MHz

n 1400 V/µs slew rate

n Wide supply voltage range: 6V (

3V) to 12V (

6V)

n −78 dB HD2

10MHz

n −75 dB HD3

10MHz

Applications

n RGB video router

n Multi input video monitor

n Fault tolerant data switch

Connection Diagram

16-Pin SSOP

20109605

Top View

Truth Table

SEL EN OUT

0 0 CH 1

1 0 CH 0

X 1 Disable

Ordering Information

Package Part Number Package Marking Transport Media NSC Drawing

16-Pin SSOP

LMH6572MQ

LH6572MQ

95 Units/Rail

MQA16

LMH6572MQX 2.5 Units Tape and Reel

LMH

™

is a trademark of National Semiconductor Corporation.

August 2004

LMH6572 Triple 2:1 High Speed Video Multiplexer

Summary of content (12 pages)

PAGE 1
LMH6572 Triple 2:1 High Speed Video Multiplexer General Description Features The LMH™6572 is a high performance analog mulitplexer optimized for professional grade video and other high fidelity high bandwidth analog applications. The LMH6572 provides a 290MHz bandwidth at 2 VPP output signal levels. The 140 MHz of .1 dB bandwidth and a 1500 V/µs slew rate make this part suitable for High Definition Television (HDTV) and High Resolution Multimedia Video applications.
PAGE 2
LMH6572 Absolute Maximum Ratings (Note 1) Soldering Information If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 4) Human Body Model Supply Voltage (V+ − V−) IOUT (Note 3) 260˚C (Note 1) 200V Operating Temperature −40˚C to 85˚C 13.
PAGE 3
LMH6572 ± 5V Electrical Characteristics (Continued) VS = ± 5V, RL = 100Ω, Unless otherwise specified. Symbol ICC Parameter Conditions(Note 2) Supply Current (Note 5) No Load Supply Current Disabled(Note 5) No Load VIH Logic High Threshold(Note 5) Select & Enable Pins VIL Logic Low Threshold (Note 5) Select & Enable Pins IiL Logic Pin Input Current Low(Note 7) Logic Input = 0V IiH Logic Pin Input Current High(Note 7) Logic Input = 2.0V Min Typ Max Units 20 23 25 28.5 mA 2.0 2.
PAGE 4
LMH6572 ± 3.3V Electrical Characteristics (Continued) VS = ± 3.3V, RL = 100Ω; Unless otherwise specified. Symbol HD3 IMD Parameter 3rd Harmonic Distortion 3 rd Order Intermodulation Products Conditions(Note 2) Min Typ Max Units 2 VPP, 10MHz −74 dBc 10 MHz, Two tones 2Vpp at output −79 dBc 2.
PAGE 5
LMH6572 Typical Performance Characteristics Vs = ± 5V, RL = 100Ω; unless otherwise specified. Frequency Response vs. VOUT Frequency Response vs. VOUT 20109602 20109601 Suggested RS vs. Capacitive Load Load= 1kΩ i CL Frequency Response vs. Capacitive Load 20109613 20109604 Harmonic Distortion vs. Output Voltage Harmonic Distortion vs. Output Voltage 20109612 20109611 5 www.national.
PAGE 6
LMH6572 Typical Performance Characteristics Vs = ±5V, RL = 100Ω; unless otherwise specified. Harmonic Distortion vs. Frequency Harmonic Distortion vs. Frequency 20109603 20109610 Harmonic Distortion vs. Supply Voltage Channel Switching Time 20109616 20109621 Disable Time Pulse Response 20109626 www.national.
PAGE 7
Crosstalk (Continued) PSRR 20109614 20109607 PSRR Closed Loop Output Impedance 20109606 20109609 Closed Loop Output Impedance 20109608 7 www.national.com LMH6572 Typical Performance Characteristics Vs = ±5V, RL = 100Ω; unless otherwise specified.
PAGE 8
LMH6572 Application Notes GENERAL INFORMATION The LMH6572 is a high-speed triple 2:1 multiplexer, optimized for very high speed and low distortion. With a fixed gain of 2 and excellent AC performance, the LMH6572 is ideally suited for switching high resolution, presentation grade video signals. The LMH6572 has no internal ground reference. Single or split supply configurations are both possible. The LMH6572 features very high speed channel switching and disable times.
PAGE 9
(Continued) An alternate approach would be to tie the outputs directly together and let all devices share a common back termination resistor in order to alleviate the gain error issue above. The drawback in this case is the increased capacitive load presented to the output of each LMH6572 due to the offstate capacitance of the LMH6572. EXPANDING THE MUX It is possible to build higher density MUX’s by paralleling several LMH6572’s. Figure 4 shows a 4:1 RGB MUX using two LMH6572’s: 20109617 FIGURE 3.
PAGE 10
LMH6572 Application Notes (Continued) 20109619 FIGURE 5. Delay Circuit Implementation R2 should be kept small compared to R1 in order to not reduce the ENABLE voltage and to produce little or no delay to ENABLE. Other Applications 20109604 The LMH6572 may be utilized in systems that involve a single RGB channel as well whenever there is a need to switch between different “flavors” of a single RGB input. Here are some examples: 1. RGB positive polarity, negative polarity switch FIGURE 7.
PAGE 11
PMAX = (150˚ – TAMB)/ θJA, where TAMB = Ambient temperature (˚C) and θJA = Thermal resistance, from junction to ambient, for a given package (˚C/W). For the SSOP package θJA is 125˚C/W. (Continued) POWER DISSIPATION The LMH6572 is optimized for maximum speed and performance in the small form factor of the standard SSOP package. To achieve its high level of performance, the LMH6572 consumes 23 mA of quiescent current, which cannot be neglected when considering the total package power dissipation limit.
PAGE 12
LMH6572 Triple 2:1 High Speed Video Multiplexer Physical Dimensions inches (millimeters) unless otherwise noted 16-Pin SSOP NS Package Number MQA16 LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1.