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National Semiconductor LMH6624 Manual

Summary of LMH6624

  • Page 1

    Lmh6624 ultra low noise wideband operational amplifier general description the lmh6624 combines wide bandwidth (1.5 gbw) with very low input noise (0.92nv/ , 2.3pa/ ) and ultra low dc errors (100µv v os , ± 0.1µv/˚c drift) providing a very precise operational amplifier with wide dynamic range. This ...

  • Page 2

    Absolute maximum ratings (note 1) if military/aerospace specified devices are required, please contact the national semiconductor sales office/ distributors for availability and specifications. Esd tolerance human body model 2000v(note 2) machine model 200v (note 9) v in differential ± 1.2v supply v...

  • Page 3

    ± 2.5v electrical characteristics (continued) unless otherwise specified, all limits guaranteed for at t a = 25˚c, v + = 2.5v, v − = −2.5v, v cm = 0v, a v = +20, r f = 500 Ω, r l = 100 Ω. Boldface limits apply at the temperature extremes. See (note 12). Symbol parameter conditions min (note 6) typ (...

  • Page 4

    ± 6v electrical characteristics (continued) unless otherwise specified, all limits guaranteed for at t a = 25˚c, v + = 6v, v − = −6v, v cm = 0v, a v = +20, r f = 500 Ω, r l = 100 Ω. Boldface limits apply at the temperature extremes. See (note 12). Symbol parameter conditions min (note 6) typ (note 5...

  • Page 5

    Note 1: absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the electrical...

  • Page 6

    Typical performance characteristics noise vs. Frequency amplifier peaking with varying r f 20058950 20058917 open loop frequency response over temperature open loop frequency response over temperature 20058959 20058960 frequency response with varying v s frequency response with varying v s 20058913 ...

  • Page 7

    Typical performance characteristics (continued) inverting frequency response inverting frequency response 20058916 20058915 non-inverting frequency response non-inverting frequency response 20058904 20058903 non-inverting frequency response varying v in non-inverting frequency response varying v in ...

  • Page 8

    Typical performance characteristics (continued) non-inverting frequency response varying v in non-inverting frequency response varying v in 20058908 20058907 frequency response with cap. Loading frequency response with cap. Loading 20058940 20058941 frequency response with cap. Loading frequency res...

  • Page 9

    Typical performance characteristics (continued) sourcing current vs. V out sourcing current vs. V out 20058957 20058954 sinking current vs. V out sinking current vs. V out 20058958 20058956 v os vs. V supply i os vs. V supply 20058955 20058953 lmh6624 www.National.Com 9.

  • Page 10

    Typical performance characteristics (continued) distortion vs. Frequency distortion vs. Frequency 20058944 20058946 distortion vs. Frequency distortion vs. Gain 20058945 20058942 distortion vs. V out peak to peak distortion vs. V out peak to peak 20058943 20058947 lmh6624 www.National.Com 10

  • Page 11

    Typical performance characteristics (continued) non-inverting large signal pulse response non-inverting large signal pulse response 20058909 20058910 non-inverting small signal pulse response non-inverting small signal pulse response 20058912 20058911 psrr vs. Frequency psrr vs. Frequency 20058948 2...

  • Page 12

    Typical performance characteristics (continued) input referred cmrr vs. Frequency input referred cmrr vs. Frequency 20058901 20058902 lmh6624 www.National.Com 12.

  • Page 13

    Application section introduction the lmh6624, a very wide gain bandwidth, ultra low noise voltage feedback operational amplifier, enables applications such as medical diagnostic ultrasound, magnetic tape & disk storage and fiber-optics to achieve maximum high frequency signal-to-noise ratios. The se...

  • Page 14

    r g = r seq for bias current cancellation. Figure 4 illus- trates the equivalent noise model using this assumption. Figure 5 is a plot of e ni against equivalent source resistance (r seq ) with all of the contributing voltage noise source of equation 2. This plo...

  • Page 15

    Application section (continued) single supply operation the lmh6624 can be operated with single power supply as shown in figure 8. Both the input and output are capacitively coupled to set the dc operating point. Low noise transimpedance amplifier figure 9 implements a low-noise transimpedance ampli...

  • Page 16

    Application section (continued) high-gain sallen-key active filters the lmh6624 is well suited for high gain sallen-key type of active filters. Figure 12 shows the 2 nd order sallen-key low pass filter topology. Using component predistortion methods discussed in oa-21 enables the proper selection of...

  • Page 17

    Application section (continued) symmetry between the positive and negative paths in the layout of differential circuitry should be maintained to mini- mize the imbalance of amplitude and phase of the differential signal. These free evaluation boards are shipped when a device sample request is placed...

  • Page 18

    Physical dimensions inches (millimeters) unless otherwise noted 5-pin sot23 ns package number mf05a 8-pin soic ns package number m08a lmh6624 www.National.Com 18.

  • Page 19: Lmh6624

    Notes 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. Life support devices or systems are d...