Datasheet

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OUT

IN1

IN0

SEL

LMH6570

www.ti.com

SNCS104C –APRIL 2005–REVISED MAY 2013

LMH6570 2:1 High Speed Video Multiplexer

Check for Samples: LMH6570

FEATURES

DESCRIPTION

The LMH™6570 is a high performance analog

• 500 MHz, 500 mV

, −3 dB Bandwidth, A

multiplexer optimized for professional grade video

• 400 MHz, 2V

, −3 dB Bandwidth, A

and other high fidelity, high bandwidth analog

• 8 ns Channel Switching Time

applications. The output amplifier selects one of two

buffered input signals based on the state of the SEL

• 70 dB Channel to Channel Isolation @ 10 MHz

pin. The LMH6570 provides a 400 MHz bandwidth at

• 0.02%, 0.05° Diff. Gain, Diff. Phase

2 V

output signal levels. Multimedia and high

• 0.1 dB Gain Flatness to 150 MHz

definition television (HDTV) applications can benefit

from the LMH6570's 0.1 dB bandwidth of 150 MHz

• 2200 V/μs Slew Rate

and its 2200 V/μs slew rate.

• Wide Supply Voltage Range: 6V (±3V) to 12V

(±6V)

The LMH6570 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 LMH6570 gain is set by external feedback and

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

• Instrumentation / Test Equipment

The LMH6570 is available in the 8-pin SOIC

package.

• Receiver IF Diversity Switch

• Multi Channel A/D Driver

• Picture in Picture Video Switch

Connection Diagram

Figure 1. 8-Pin SOIC - Top View

See D Package

Truth Table

SEL SD OUTPUT

1 0 IN1 * (1+RF/RG)

0 0 IN0 * (1+RF/RG)

X 1 Shutdown

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 (21 pages)

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LMH6570 www.ti.com SNCS104C – APRIL 2005 – REVISED MAY 2013 LMH6570 2:1 High Speed Video Multiplexer Check for Samples: LMH6570 FEATURES DESCRIPTION 1 • • • • • • • • 23 • • The LMH™6570 is a high performance analog multiplexer optimized for professional grade video and other high fidelity, high bandwidth analog applications. The output amplifier selects one of two buffered input signals based on the state of the SEL pin. The LMH6570 provides a 400 MHz bandwidth at 2 VPP output signal levels.
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LMH6570 SNCS104C – APRIL 2005 – REVISED MAY 2013 www.ti.com 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. Absolute Maximum Ratings (1) (2) Human Body Model ESD Tolerance (3) 2000V Machine Model 200V Supply Voltage (V+ − V−) 13.2V IOUT (4) 130 mA Signal & Logic Input Pin Voltage ±(VS+0.
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LMH6570 www.ti.com SNCS104C – APRIL 2005 – REVISED MAY 2013 ±5V Electrical Characteristics (continued) VS = ±5V, RL = 100Ω, RF=576Ω, AV=2 V/V, TJ=25 °C, Unless otherwise specified. Bold numbers specify limits at temperature extremes. Symbol Conditions (1) Parameter Min (2) Typ (3) Max (2) Units TSS Settling Time to 0.
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LMH6570 SNCS104C – APRIL 2005 – REVISED MAY 2013 www.ti.com ±5V Electrical Characteristics (continued) VS = ±5V, RL = 100Ω, RF=576Ω, AV=2 V/V, TJ=25 °C, Unless otherwise specified. Bold numbers specify limits at temperature extremes.
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LMH6570 www.ti.com SNCS104C – APRIL 2005 – REVISED MAY 2013 ±3.3V Electrical Characteristics (continued) VS = ±3.3V, RL = 100Ω, RF=576Ω, AV=2 V/V; Unless otherwise specified.
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LMH6570 SNCS104C – APRIL 2005 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics Vs = ±5V, RL = 100Ω, AV=2, RF=RG=576Ω; unless otherwise specified. Frequency Response vs. VOUT 1 1 0 0 -1 -1 VOUT = 0.5 VPP NORMALIZED GAIN (dB) NORMALIZED GAIN (dB) Frequency Response vs. Gain -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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LMH6570 www.ti.com SNCS104C – APRIL 2005 – REVISED MAY 2013 Typical Performance Characteristics (continued) Vs = ±5V, RL = 100Ω, AV=2, RF=RG=576Ω; unless otherwise specified. Pulse Response 2VPP Pulse Response 2VPP 1.5 1.5 VS = ±3.3V 1 0.5 0.5 VOUT (V) VOUT (V) VS = ±5V 1 0 0 -0.5 -0.5 -1 -1 -1.5 -1.5 5 0 10 15 20 25 30 5 0 10 15 20 TIME (ns) TIME (ns) Figure 8. Figure 9.
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LMH6570 SNCS104C – APRIL 2005 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) Vs = ±5V, RL = 100Ω, AV=2, RF=RG=576Ω; unless otherwise specified. SHUTDOWN Switching Shutdown Glitch 0.5 0.08 0.25 0.06 SHUTDOWN GLITCH VOUT 3 0.02 SHUTDOWN ON 0 -0.02 4 SHUTDOWN SIGNAL 2 CONTROL (V) -0.5 OUTPUT (V) VOUT (V) -0.25 SHUTDOWN (V) 0.04 0 2 1 0 SHUTDOWN 0 10 0 20 30 40 50 60 70 0 80 5 TIME (ns) Figure 14. Figure 15. HD2 vs. Frequency HD3 vs.
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LMH6570 www.ti.com SNCS104C – APRIL 2005 – REVISED MAY 2013 Typical Performance Characteristics (continued) Vs = ±5V, RL = 100Ω, AV=2, RF=RG=576Ω; unless otherwise specified. HD2 vs. VOUT HD3 vs. VOUT -30 -40 f = 5 MHz f = 5 MHz -40 -50 -50 DISTORTION (dBc) DISTORTION (dBc) CH 1 -60 -70 -80 CH 0 -60 -70 -80 -90 -90 -100 -100 0 1 2 3 4 5 6 7 0 8 OUTPUT VOLTAGE (VPP) 2 5 Figure 21. Minimum VOUT vs. IOUT (1) Maximum VOUT vs. IOUT (1) 6 7 8 4 MAXIMUM OUTPUT VOLTAGE (V) -2.
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LMH6570 SNCS104C – APRIL 2005 – REVISED MAY 2013 www.ti.com APPLICATION NOTES GENERAL INFORMATION V + 6 IN 0 SEL 1 RT 2 RIN0 + IN 1 VOUT 7 ROUT RF 8 4 RG RIN1 SD 3 RT 5 - V Figure 26. Typical Application The LMH6570 is a high-speed 2:1 analog multiplexer, optimized for very high speed and low distortion. With selectable gain and excellent AC performance, the LMH6570 is ideally suited for switching high resolution, presentation grade video signals.
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LMH6570 www.ti.com SNCS104C – APRIL 2005 – REVISED MAY 2013 FEEDBACK RESISTOR SELECTION 1600 SUGGESTED VALUE OF RF (:) 1400 1200 1000 800 600 400 200 0 1 2 3 4 5 6 7 8 9 10 GAIN (V/V) Figure 27. Suggested RF vs. Gain The LMH6570 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. For a gain of 2 V/V, the recommended value of RF is 576Ω.
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LMH6570 SNCS104C – APRIL 2005 – REVISED MAY 2013 www.ti.com R1 75: + ON 487: RL 75: R2 75: 576: + OFF STAGE GAIN = 1 + RF/RG = 2.18 V/V 487: 576: R3 75: + GAIN ERROR OFF R4 75: + [(1138/3) || 75] + 75 = 0.91 V/V NET GAIN = 0.5 * STAGE GAIN * GAIN ERROR = 0.993 V/V 487: 576: [(1138/3) || 75] · 2 = OFF 487: 576: Figure 28. Multiplexer Gain Compensation BUILDING A 4:1 MULITPLEXER Figure 29 shows an 4:1 MUX using two LMH6570’s.
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LMH6570 www.ti.com SNCS104C – APRIL 2005 – REVISED MAY 2013 R2 D1 TO SD C1 R1 Figure 30. Delay Circuit Implementation If it is important in the end application to make sure that no two inputs are presented to the output at the same time, an optional delay block can be added, to drive the SHUTDOWN pin of each device, as shown. Figure 30 shows one possible approach to this delay circuit.
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LMH6570 SNCS104C – APRIL 2005 – REVISED MAY 2013 www.ti.com 2 90 80 LOAD = 1 k: || CL 70 0 NORMALIZED GAIN (dB) SUGGESTED ROUT (:) CL = 8.6 pF, ROUT = 63: VS = ±5V 60 50 40 30 20 CL = 18 pF, ROUT = 48: -2 CL = 56 pF, ROUT = 24: -4 CL = 100 pF, ROUT = 19: -6 V OUT = 1 VPP CL || 1 k: -8 V = ±5V S 10 AV = 2 (V/V) 0 -10 1 10 100 CAPACTIVE LOAD (pF) 1 1000 10 100 1000 FREQUENCY (MHz) Figure 32. Suggested ROUT vs. Capacitive Load Figure 33. Frequency Response vs.
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LMH6570 www.ti.com SNCS104C – APRIL 2005 – REVISED MAY 2013 Follow these steps to determine the maximum power dissipation for the LMH6570: 1. Calculate the quiescent (no-load) power: PAMP = ICC* (VS), where • VS = V+ - V− (1) 2. Calculate the RMS power dissipated in the output stage: PD (rms) = rms ((VS - VOUT) * IOUT) where • • VOUT and IOUT are the voltage across The current through the external load and VS is the total supply voltage (2) 3.
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LMH6570 SNCS104C – APRIL 2005 – REVISED MAY 2013 www.ti.com REVISION HISTORY Changes from Revision B (April 2013) to Revision C • 16 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LMH6570MAX/NOPB Package Package Pins Type Drawing SOIC D 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.5 B0 (mm) K0 (mm) P1 (mm) 5.4 2.0 8.0 W Pin1 (mm) Quadrant 12.
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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) LMH6570MAX/NOPB SOIC D 8 2500 367.0 367.0 35.
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