PDF LMH6553 Data sheet ( Hoja de datos )

Número de pieza	LMH6553
Descripción	900 MHz Fully Differential Amplifier
Fabricantes	National Semiconductor
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No Preview Available ! www.DataSheet4U.com November 17, 2008 LMH6553 900 MHz Fully Differential Amplifier With Output Limiting Clamp General Description The LMH6553 is a 900 MHz differential amplifier with an in- tegrated adjustable output limiting clamp. The clamp increas- es system performance and provides transient over-voltage protection to following stages. The internal clamp feature of the LMH6553 reduces or eliminates the need for external dis- crete overload protection networks. When used to drive ADCs, the amplifier's output clamp allows low voltage ADC inputs to be protected from being overdriven and damaged by large input signals appearing at the system input. Fast over- drive recovery of 600 ps ensures the amplifier output rapidly recovers from a clamping event and quickly resumes to follow the input signal. The LMH6553 delivers exceptional band- width, distortion, and noise performance ideal for driving ADCs up to 14-bits. The LMH6553 could also be used for au- tomotive, communication, medical, test and measurement, video, and LIDAR applications. With external gain set resistors and integrated common mode feedback, the LMH6553 can be configured as either a differ- ential input to differential output or single ended input to differential output gain block. The LMH6553 can be AC or DC coupled at the input which makes it suitable for a wide range of applications including communication systems and high speed oscilloscope front ends. The LMH6553 is available in 8-pin PSOP and 8-pin LLP packages, and is part of our LMH® high speed amplifier family. Features ■ 900 MHz −3 dB small signal bandwidth @ AV = 1 ■ 670 MHz −3 dB large signal bandwidth @ AV = 1 ■ −79 dB THD @ 20 MHz ■ −92 dB IMD3 @ fc = 20 MHz ■ 10 ns settling time to 0.1% ■ 600 ps clamp overdrive recovery time ■ 40 mV clamp accuracy with 100% Overdrive ■ −0.1 mV/°C clamp temperature drift ■ 4.5 to 12 supply voltage operation Applications ■ Differential ADC driver ■ Video over twisted pair ■ Differential line driver ■ Single end to differential converter ■ High speed differential signaling ■ IF/RF amplifier ■ SAW filter buffer/driver ■ CCD Output Limiting Amplifier ■ Automotive Safety Applications Typical Application Single-Ended Input Differential Output ADC Driver LMH® is a registered trademark of National Semiconductor Corporation. © 2008 National Semiconductor Corporation 300437 30043769 www.national.com 1 page Symbol Parameter www.DataSheet4U.com Conditions Min Typ Max (Note 8) (Note 7) (Note 8) Noise Figure (See Figure 5) Input Characteristics 50Ω System, AV = 9, 10 MHz 10.3 IBI IBoffset Input Bias Current (Note 11) Input Bias Current Differential (Note 7) VCM = 0V, VID = 0V, IBoffset = (IB− - IB+)/2 −90 45 −24 2 90 24 CMRR Common Mode Rejection Ratio (Note 7) DC, VCM = 0V, VID = 0V 80 RIN CIN CMVR Input Resistance Input Capacitance Input Common Mode Voltage Range Differential Differential CMRR > 38 dB ±1.0 15 0.5 ±1.2 Output Performance Output Voltage Swing (Note 7) Differential Output 5.32 5.47 IOUT Linear Output Current (Note 7) VOUT = 0V ISC Short Circuit Current One Output Shorted to Ground VIN = 2V Single-Ended (Note 6) ±75 ±95 ±140 Clamp Performance V CLAMP VCLAMP Voltage Range Continuous Operation (Note 11) VCM VCM + 2.0 VCLAMP Peak Voltage (Note 14) VCM + 3.0 Default VCLAMP Voltage Upper Clamp Level Accuracy VCLAMP Floating VIN = 0V, VCLAMP = +0.5V, VCM = 0, VO = +0.5V, 100% Overdrive 0.42 −39 0.48 −30 0.54 +39 Lower Clamp Level Accuracy VIN = 0V, VCLAMP = +0.5V, VCM = 0, VO = −0.5V, −18 6 +18 100% Overdrive Clamp Accuracy Temperature Drift −0.1 Clamp Pin Bias Current Clamp Pin Bias Drift VIN = 0V, VCLAMP = 1V, VCM = 0 23.5 0.3 Diff Amp Input Bias Shift Linear to Clamped Operation 50 Clamp Pin Input Impedance 30 1 Clamp Pin Feedthrough f = 10 MHz −60 Clamp Bandwidth Clamp Slew Rate 0.5VDC + 40 mVPP, SE VIN = 2V 100% Overdrive 125 52 Clamp Overshoot Clamp Overshoot Clamp Overshoot Width VIN = 1V Step, AV = 2 V/V, VCLAMP = 0.5V, VCM= 0V, 100% Overdrive VIN = 1V Step, AV= 2 V/V, VCLAMP = 1V, VCM = 0.5V, 100% Overdrive (Note 13) 105 105 650 Clamp Overdrive Recovery Time Linearity Guardband (Note 12) VIN = 2V Step, AV = 2 V/V, VCLAMP = 0.5V, VCM = 0V, 50% Output Crossing f = 75 MHz, VOD = 2 VPP, RL = 800, SFDR Down 3 dB 600 40 Output Common Mode Control Circuit Common Mode Small Signal Bandwidth VIN+ = VIN− = 0 130 VOSCM Slew Rate Output Common Mode Error VIN+ = VIN− = 0 Common Mode, VIN = float, VCM = 0 186 −20 2 20 Units dB µA µA dBc Ω pF V VPP mA mA V V mV mV/°C µA µA/°C µA kΩ/pF dB MHz V/µs mV mV ps ps mV MHz V/μs mV 5 www.national.com 5 Page www.DataSheOeut4tpUu.ctoCmommon Mode Pulse Response Distortion vs. Frequency Single-Ended Input (RL=800Ω) 30043724 Distortion vs. Supply Voltage (fc=20Mhz, RL=800Ω) 30043729 Distortion vs. Supply Voltage (fc=75Mhz, RL=800Ω) 30043743 Distortion vs. VCM (fc=20Mhz, RL=800Ω) 30043737 Distortion vs. VCM (fc=75Mhz, RL=800Ω) 30043738 11 30043767 www.national.com 11 Page

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