LMH6644| Datasheet

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LMH6642/LMH6643/LMH6644 Low Power, 130MHz, 75mA Rail-to-Rail Output Amplifiers

October 2006

LMH6642/LMH6643/LMH6644 Low Power, 130MHz, 75mA Rail-to-Rail Output Amplifiers
General Description
The LMH664X family true single supply voltage feedback amplifiers offer high speed (130MHz), low distortion (-62dBc), and exceptionally high output current (approximately 75mA) at low cost and with reduced power consumption when compared against existing devices with similar performance. Input common mode voltage range extends to 0.5V below V- and 1V from V+. Output voltage range extends to within 40mV of either supply rail, allowing wide dynamic range especially desirable in low voltage applications. The output stage is capable of approximately 75mA in order to drive heavy loads. Fast output Slew Rate (130V/us) ensures large peak-to-peak output swings can be maintained even at higher speeds, resulting in exceptional full power bandwidth of 40MHz with a 3V supply. These characteristics, along with low cost, are ideal features for a multitude of industrial and commercial applications. Careful attention has been paid to ensure device stability under all operating voltages and modes. The result is a very well b
ehaved frequency response characteristic (0.1dB gain flatness up the 12MHz under 150 load and AV = +2) with minimal peaking (typically 2dB maximum) for any gain setting and under both heavy and light loads. This along with fast settling time (68ns) and low distortion allows the device to operate well in ADC buffer, and high frequency filter applications as well as other applications. This device family offers professional quality video performance with low DG (0.01%) and DP (0.01 ) characteristics. Differential Gain and Differential Phase characteristics are also well maintained under heavy loads (150) and throughout the output voltage range. The LMH664X family is offered in single (LMH6642), dual (LMH6643), and quad (LMH6644) options. See ordering information for packages offered.

Features
(VS = 5V, TA = 25 C, RL = 2k, AV = +1. Typical values unless specified). n -3dB BW (AV = +1) 130MHz n Supply voltage range 2.7V to 12.8V n Slew rate (Note 8), (AV = -1) 130V/us n Supply current (no load) 2.7mA/amp n Output short circuit current +115mA/-145mA 75mA n Linear output current n Input common mode volt. 0.5V beyond V-, 1V from V+ n Output voltage swing 40mV from rails n Input voltage noise (100kHz) 17nV/ n Input current noise (100kHz) 0.9pA/ n THD (5MHz, RL = 2k, VO = 2VPP, AV = +2) -62dBc n Settling time 68ns n Fully characterized for 3V, 5V, and 5V n Overdrive recovery 100ns n Output short circuit protected (Note 11) n No output phase reversal with CMVR exceeded

Applications
n n n n n Active filters CD/DVD ROM ADC buffer amp Portable video Current sense buffer

Closed Loop Gain vs. Frequency for Various Gain

Large Signal Frequency Response

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2006 National Semiconductor Corporation

DS200185

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