Document
LMH6739 Very Wideband, Low Distortion Triple Video Buffer
November 2004
LMH6739 Very Wideband, Low Distortion Triple Video Buffer
General Description
The LMH6739 is a very wideband, DC coupled monolithic programmable gain buffer designed specifically for ultra high resolution video systems as well as wide dynamic range systems requiring exceptional signal fidelity. Benefiting from National’s current feedback architecture, the LMH6739 offers gains of −1, 1 and 2. At a gain of +2 the LMH6739 supports ultra high resolution video systems with a 400 MHz 2 VPP 3 dB Bandwidth. With 12-bit distortion level through 30 input referred noise, the MHz (RL = 100Ω), 2.3nV/ LMH6739 is the ideal driver or buffer for high speed flash A/D and D/A converters. Wide dynamic range systems such as radar and communication receivers requiring a wideband amplifier offering exceptional signal purity will find the LMH6739’s low input referred noise and low harmonic distortion make it an attractive solution. The LMH6739 is available in a space saving SSOP package.
Features
n n n n n n n n 750 MHz −3 dB small signal bandwidth (AV = +1) −85 dBc 3rd harmonic distortion (20 MHz) 2.3 nV/ input noise voltage 3300 V/µs slew rate 32 mA supply current (10.6 mA per op amp) 90 mA linear output current 0.02/0.01 Diff. Gain / Diff. Phase (RL = 150Ω) 2mA shutdown current
Applications
n n n n n n n n n RGB video driver High resolution projectors Flash A/D driver D/A transimpedance buffer Wide dynamic range IF amp Radar/communication receivers DDS post-amps Wideband inverting summer Line driver
Connection Diagram
16-Pin SSOP
20104110
Top View
Ordering Information
Package 16-pin SSOP Part Number LMH6739MQ LMH6739MQX Package Marking LH6739MQ Transport Media 95 Units/Rail 2.5k Units Tape and Reel NSC Drawing MQA16
VIP10™ is a trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation
DS201041
www.national.com
LMH6739
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (V+ - V– ) IOUT Common Mode Input Voltage Maximum Junction Temperature Storage Temperature Range Soldering Information Infrared or Convection (20 sec.) Wave Soldering (10 sec.) 235˚C 260˚C 13.2V (Note 3)
ESD Tolerance (Note 4) Human Body Model Machine Model Storage Temperature Range 2000V 200V −65˚C to +150˚C
± VCC
+150˚C −65˚C to +150˚C
Operating Ratings (Note 1)
Operating Temperature Range Supply Voltage (V+ - V– ) Thermal Resistance Package 16-Pin SSOP (θJC) 36˚C/W (θJA) 120˚C/W −40˚C 8V to +85˚C 12V
Electrical Characteristics (Note 2)
AV = +2, VCC = ± 5V, RL = 100Ω; unless otherwise specified. Symbol UGBW SSBW LSBW 0.1 dB Bandwidth GFR2 TRS TRL SR ts te td Distortion HD2L HD2 HD2H HD3L HD3 HD3H Equivalent Input Noise VN ICN NCN DG DP VOS IBN IBI PSRR Non-Inverting Voltage Inverting Current Non-Inverting Current Differential Gain Differential Phase Input Offset Voltage (Note 6) Input Bias Current (Note 6) Input Bias Current (Note 6) Power Supply Rejection Ratio (Note 6) Non-Inverting Inverting 50 48.5 −16 −21 3rd Harmonic Distortion 2nd Harmonic Distortion 2 VPP, 5 MHz 2 VPP, 20 MHz 2 VPP, 50 MHz 2 VPP, 5 MHz 2 VPP, 20 MHz 2 VPP, 50 MHz −80 −71 −55 −90 −85 −65 2.3 12 3 .02 .01 0.5 −8 −2 53 nV/ pA/ pA/ % degree dBc dBc Rolloff Rise and Fall Time (10% to 90%) Slew Rate Settling Time to 0.1% Enable Time Disable Time Time Domain Response 2V Step 5V Step 5V Step 2V Step From Disable = rising edge. From Disable = falling edge. 0.9 1.7 3300 10 7.3 4.5 ns V/µs ns ns ns Parameter -3 dB Bandwidth -3 dB Bandwidth Conditions Unity Gain, VOUT = 200 mVPP VOUT = 200 mVPP VOUT = 2 VPP VOUT = 2 VPP
@ 300 MHz, VOUT = 2 VPP
Min
Typ 750 480 400 150 1.0
Max
Units MHz MHz MHz dB
Frequency Domain Performance
> 1 MHz > 1 MHz > 1 MHz
4.43 MHz, RL = 150Ω 4.43 MHz, RL = 150Ω
Video Performance
Static, DC Performance
± 2.5 ± 4.5
0 +5
mV µV µA dB
± 30 ± 40
www.national.com
2
LMH6739
Electrical Characteristics (Note 2)
Symbol CMRR ICC Parameter Common Mode Rejection Ratio (Note 6) Supply Current (Note 6) Supply Current Disabled V+ Supply Current Disabled V
−
(Continued) AV = +2, VCC = ± 5V, RL = 100Ω; unless otherwise specified. Conditions Min 46 44 All three amps Enabled, No Load RL = ∞ RL = ∞ 375 RL = ∞ Typ 50 32 1.9 1.1 450 0.2 1000 .8 Output impedance of input buffer. DC RL = 100Ω RL = ∞ 30 0.05 35 40 2.2 1.3 525 Max Units dB mA mA mA Ω % kΩ pF Ω Ω
Internal Feedback & Gain Set Resistor Value Gain Error Miscellaneous Performance RIN+ CIN+ RIN− RO VO Non-Inverting Input Resistance Non-Inverting Input Capacitance Inverting Input Impedance Output Impedance Output Voltage Range (Note 6)
± 1.1
CMIR IO ISC IIH IIL VDMAX VDMIM
Common Mode Input Range (Note 6) Linear Output Current (Note 3) (Note 6) Short Circuit Current (Note 5) Disable Pin Bias Current High Disable Pin Bias Current Low Voltage for D.