January 9, 2012
LMH6642/LMH6643/LMH6644
Low Power, 130MHz, 75mA Rail-to-Rail Output Amplifiers
General Description
Features
The LMH664X family true single supply voltage feedback am-
plifiers offer high speed (130MHz), low distortion (−62dBc),
and exceptionally high output current (approximately 75mA)
at low cost and with reduced power consumption when com-
pared against existing devices with similar performance.
(VS = ±5V, TA = 25°C, RL = 2kΩ, AV = +1. Typical values un-
less specified).
−3dB BW (AV = +1)
Supply voltage range
130MHz
2.7V to 12.8V
130V/µs
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Slew rate (Note 8), (AV = −1)
Supply current (no load)
Output short circuit current
Linear output current
Input common mode volt.
Output voltage swing
Input voltage noise (100kHz)
Input current noise (100kHz)
THD (5MHz, RL = 2kΩ, VO = 2VPP, AV = +2)
Settling time
Input common mode voltage range extends to 0.5V below V
2.7mA/amp
+115mA/−145mA
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and 1V from V+. Output voltage range extends to within
40mV of either supply rail, allowing wide dynamic range es-
pecially desirable in low voltage applications. The output
stage is capable of approximately 75mA in order to drive
heavy loads. Fast output Slew Rate (130V/µs) 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.
±75mA
0.5V beyond V−, 1V from V+
40mV from rails
17nV/
0.9pA/
−62dBc
68ns
Fully characterized for 3V, 5V, and ±5V
Overdrive recovery
Output short circuit protected (Note 11)
No output phase reversal with CMVR exceeded
Careful attention has been paid to ensure device stability un-
der all operating voltages and modes. The result is a very well
behaved frequency response characteristic (0.1dB gain flat-
ness up the 12MHz under 150Ω 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 applica-
tions as well as other applications.
100ns
Applications
Active filters
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CD/DVD ROM
ADC buffer amp
This device family offers professional quality video perfor-
mance with low DG (0.01%) and DP (0.01°) characteristics.
Differential Gain and Differential Phase characteristics are al-
so well maintained under heavy loads (150Ω) 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.
Portable video
Current sense buffer
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Closed Loop Gain vs. Frequency for Various Gain
Large Signal Frequency Response
20018547
20018535
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200185 SNOS966O
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