Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsInterface ICsInterface IC - multiplexers SOICN 14

OUT

A0IN3

IN2

GND

IN1

GND

IN0 1

7 8

LMH6574

www.ti.com

SNCS103C –NOVEMBER 2004–REVISED SEPTEMBER 2005

LMH6574 4:1 High Speed Video Multiplexer

Check for Samples: LMH6574

FEATURES

DESCRIPTION

The LMH™ 6574 is a high performance analog

• 500 MHz, 500 mV −3 dB Bandwidth, A

= 2

multiplexer optimized for professional grade video

• 400 MHz, 2V

−3 dB Bandwidth, A

= 2

and other high fidelity high bandwidth analog

• 8 ns Channel Switching Time

applications. The output amplifier selects any one of

four buffered input signals based on the state of the

• 70 dB Channel to Channel Isolation @ 10 MHz

two address bits. The LMH6574 provides a 400 MHz

• 0.02%, 0.05° Diff. Gain, Phase

bandwidth at 2 V

output signal levels. Multimedia

• 0.1 dB Gain Flatness to 150 MHz

and high definition television (HDTV) applications can

benefit from the LMH6574's 0.1 dB bandwidth of 150

• 2200 V/μs Slew Rate

MHz and its 2200 V/μs slew rate.

• Wide Supply Voltage Range: 6V (±3V) to

12V (±6V)

The LMH6574 supports composite video applications

with its 0.02% and 0.05° differential gain and phase

• -68 dB HD2 @ 5 MHz

errors for NTSC and PAL video signals while driving

• -84 dB HD3 @ 5 MHz

a single, back terminated 75Ω load. An 80 mA linear

output current is available for driving multiple video

APPLICATIONS

load applications.

• Video Router

The LMH6574 gain is set by external feedback and

• Multi Input Video Monitor gain set resistors for maximum flexibility.

• Instrumentation/Test Equipment

The LMH6574 is available in the 14 pin SOIC

package.

• Receiver IF Diversity Switch

• Multi Channel A/D Driver

• Picture in Picture Video Switch

Connection Diagram

Figure 1. 14-Pin SOIC (Top View)

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2LMH is a trademark of Texas Instruments.

3All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (22 pages)

PAGE 1
LMH6574 www.ti.com SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 LMH6574 4:1 High Speed Video Multiplexer Check for Samples: LMH6574 FEATURES DESCRIPTION 1 • • • • • • • • 23 • • 500 MHz, 500 mV −3 dB Bandwidth, AV = 2 400 MHz, 2VPP −3 dB Bandwidth, AV = 2 8 ns Channel Switching Time 70 dB Channel to Channel Isolation @ 10 MHz 0.02%, 0.05° Diff. Gain, Phase 0.
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LMH6574 SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 www.ti.com Truth Table A1 A0 EN SD OUT 1 1 0 0 CH 3 1 0 0 0 CH2 0 1 0 0 CH1 0 0 0 0 CH 0 X X 1 0 Disable X X X 1 Shutdown These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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LMH6574 www.ti.com SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 ±5V Electrical Characteristics VS = ±5V, RL = 100Ω, AV = 2 V/V, RF = 575 Ω, TJ = 25 °C, Unless otherwise specified. Bold numbers specify limits at temperature extremes. Symbol Conditions (1) Parameter Min Typ Max Units Frequency Domain Performance SSBW −3 dB Bandwidth VOUT = 0.5 VPP 500 MHz LSBW –3 dB Bandwidth VOUT = 2 VPP 400 MHz .1 dBBW 0.1 dB Bandwidth VOUT = 0.
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LMH6574 SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 www.ti.com ±5V Electrical Characteristics (continued) VS = ±5V, RL = 100Ω, AV = 2 V/V, RF = 575 Ω, TJ = 25 °C, Unless otherwise specified. Bold numbers specify limits at temperature extremes. Symbol IiH Conditions (1) Parameter Logic Pin Input Current High (3) Min Logic Input = 2.0V, Select & Enable Pins (SD & EN) Typ Max Units 47 68 72.5 µA Miscellaneous Performance RIN+ Input Resistance CIN Input Capacitance 5 kΩ 0.
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LMH6574 www.ti.com SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 ±3.3V Electrical Characteristics VS = ±3.3V, RL = 100Ω, AV = 2 V/V, RF = 575 Ω; Unless otherwise specified. Symbol Conditions (1) Parameter Min Typ Max Units Frequency Domain Performance SSBW −3 dB Bandwidth VOUT = 0.5 VPP 475 MHz LSBW −3 dB Bandwidth VOUT = 2.0 VPP 375 MHz 0.1 dBBW 0.1 dB Bandwidth VOUT = 0.5 VPP 100 MHz GFP Peaking DC to 200 MHz 0.
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LMH6574 SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 www.ti.com Typical Performance Characteristics Vs = ±5V, RL = 100Ω, AV = 2, RF = RG = 575Ω; unless otherwise specified. Frequency Response vs. VOUT Frequency Response vs. Gain 1 0 0 -1 -1 VOUT = 0.5 VPP NORMALIZED GAIN (dB) NORMALIZED GAIN (dB) 1 -2 VOUT = 1 VPP -3 -4 VOUT = 2 VPP -5 -6 VOUT = 4 VPP -7 VS = ±5V -8 AV = 1, RF = 1.
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LMH6574 www.ti.com SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 Typical Performance Characteristics (continued) Vs = ±5V, RL = 100Ω, AV = 2, RF = RG = 575Ω; unless otherwise specified. Pulse Response 2VPP Pulse Response 2VPP 1.5 1.5 VS = ±5V VS = ±3.3V 0.5 0.5 VOUT (V) 1 VOUT (V) 1 0 0 -0.5 -0.5 -1 -1 -1.5 -1.5 5 0 10 15 20 25 30 5 0 10 TIME (ns) 15 20 25 30 TIME (ns) Figure 8. Figure 9.
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LMH6574 SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 www.ti.com Typical Performance Characteristics (continued) Vs = ±5V, RL = 100Ω, AV = 2, RF = RG = 575Ω; unless otherwise specified. SHUTDOWN Switching 0.5 Shutdown Glitch 0.5 AV = 2 -0.25 -0.5 3 VOUT OUTPUT (V) 0 SHUTDOWN (V) 0 -0.25 -0.5 -0.75 6 2 4 SHUTDOWN 1 SHUTDOWN VOLTAGE (V) VOUT VOUT (V) VIN = 0V 0.25 0.25 2 SHUTDOWN 0 0 10 0 20 30 40 50 60 70 80 40 60 80 100 120 140 160 TIME (ns) TIME (ns) Figure 14.
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LMH6574 www.ti.com SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 Typical Performance Characteristics (continued) Vs = ±5V, RL = 100Ω, AV = 2, RF = RG = 575Ω; unless otherwise specified. HD2 vs. VS -60 CH2 f = 5 MHz -65 -70 -70 DISTORTION (dBc) DISTORTION (dBc) CH3 -65 -75 -80 -85 HD3 vs. VS -60 CH1 CH0 -90 VOUT = 2 VPP -75 CH3 -80 -85 CH1 -90 CH2 f = 5 MHz VOUT = 2 VPP -95 -95 CH0 -100 -100 5 6 7 8 9 11 10 12 5 6 SUPPLY VOLTAGE (V) 7 Figure 20.
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LMH6574 SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 www.ti.com Typical Performance Characteristics (continued) Vs = ±5V, RL = 100Ω, AV = 2, RF = RG = 575Ω; unless otherwise specified. Crosstalk vs. Frequency -30 Off Isolation -30 UNSELECTED INPUT TO SELECTED INPUT TO OUTPUT -40 OUTPUT, VS = ±5V -50 -60 -70 -80 -60 DISABLE -70 -80 -90 -90 -100 -100 -110 0.01 0.1 1 10 100 1000 SHUTDOWN -110 0.01 FREQUENCY (MHz) 0.1 1 10 100 FREQUENCY (MHz) Figure 26.
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LMH6574 www.ti.com SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 APPLICATION NOTES GENERAL INFORMATION + V A0 14 RT 8 IN 0 1 A1 RIN0 IN 1 9 3 + - RIN1 VOUT 13 12 IN 2 RT ROUT RF 5 RG IN 3 SD 11 RIN2 7 10 RT RIN3 EN 2, 4 6 RT - V Figure 28. Typical Application The LMH6574 is a high-speed 4:1 analog multiplexer, optimized for very high speed and low distortion.
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LMH6574 SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 www.ti.com FEEDBACK RESISTOR SELECTION SUGGESTED VALUE OF RF (:) 1600 1400 1200 1000 800 600 400 200 0 1 2 3 4 5 6 7 8 9 10 GAIN (V/V) Figure 29. Suggested RF vs. Gain The LMH6574 has a current feedback output buffer with gain determined by external feedback (RF) and gain set (RG) resistors. With current feedback amplifiers, the closed loop frequency response is a function of RF.
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LMH6574 www.ti.com SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 MULTIPLEXER EXPANSION Figure 30 shows an 8:1 MUX using two LMH6574s. A0 4:1 A1 8 A0 9 A1 A2 1 0 1 3 ROUT + - IN 5 13 2 RF 12 3 7 RG LMH6574 11 VOUT SD 8 4:1 A0 1 4 9 5 A1 3 ROUT + - IN 5 13 6 RF 12 7 7 RG LMH6574 11 SD Figure 30. 8:1 MUX USING TWO LMH6574s R2 D1 C1 TO SD R1 Figure 31.
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LMH6574 SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 www.ti.com With the SHUTDOWN pin putting the output stage into a high impedance state, several LMH6574’s can be tied together to form a larger input MUX. However, there is a loading effect on the active output caused by the unselected devices. The circuit in Figure 32 shows how to compensate for this effect. For the 16:1 MUX function shown in Figure 32 below the gain error would be about −0.8 dB, or about 9%.
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LMH6574 www.ti.com SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 ROUT VOUT 45: RL CL LMH6574 1 k: 10 pF Figure 33. Decoupling Capacitive Loads 90 VS = ±5V SUGGESTED ROUT (:) 80 LOAD = 1 k: || CL 70 60 50 40 30 20 10 0 1 10 100 CAPACTIVE LOAD (pF) 1000 Figure 34. Suggested ROUT vs. Capacitive Load 2 CL = 8.
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LMH6574 SNCS103C – NOVEMBER 2004 – REVISED SEPTEMBER 2005 www.ti.com POWER DISSIPATION The LMH6574 is optimized for maximum speed and performance in the small form factor of the standard SOIC package. To ensure maximum output drive and highest performance, thermal shutdown is not provided. Therefore, it is of utmost importance to make sure that the TJMAX is never exceeded due to the overall power dissipation. Follow these steps to determine the Maximum power dissipation for the LMH6574: 1.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LMH6574MAX/NOPB Package Package Pins Type Drawing SOIC D 14 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 16.4 Pack Materials-Page 1 6.5 B0 (mm) K0 (mm) P1 (mm) 9.35 2.3 8.0 W Pin1 (mm) Quadrant 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMH6574MAX/NOPB SOIC D 14 2500 367.0 367.0 35.
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