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LMH6645, LMH6646, LMH6647
SNOS970D –JUNE 2001–REVISED NOVEMBER 2014
LMH664x 2.7 V, 650 μA, 55 MHz, Rail-to-Rail Input and Output Amplifiers
with Shutdown Option
1 Features
3 Description
•
(VS = 2.7V, TA = 25°C, RL = 1kΩ to V+/2, AV = +1.
The LMH6645 (single) and LMH6646 (dual), rail-to-
rail input and output voltage feedback amplifiers, offer
high speed (55 MHz), and low voltage operation (2.7
V) in addition to micro-power shutdown capability
(LMH6647, single).
1
Typical Values Unless Specified.
•
•
•
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−3dB BW 55 MHz
Supply Voltage Range 2.5 V to 12 V
Slew Rate 22 V/μs
Input common mode voltage range exceeds either
supply by 0.3 V, enhancing ease of use in multitude
of applications where previously only inferior devices
could be used. Output voltage range extends to
within 20 mV of either supply rails, allowing wide
dynamic range especially in low voltage applications.
Even with low supply current of 650 μA/amplifier,
output current capability is kept at a respectable ±20
mA for driving heavier loads. Important device
parameters such as BW, Slew Rate and output
current are kept relatively independent of the
operating supply voltage by a combination of process
enhancements and design architecture.
Supply Current 650 μA/channel
Output Short Circuit Current 42 mA
Linear Output Current ±20 mA
Input Common Mode Voltage 0.3 V Beyond Rails
Output Voltage Swing 20 mV from Rails
Input Voltage Noise 17 nV/√Hz
Input Current Noise 0.75 pA/√Hz
2 Applications
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Active Filters
Device Information(1)
High Speed Portable Devices
Multiplexing Applications (LMH6647)
Current Sense Buffer
PART NUMBER
PACKAGE
SOT-23 (5)
SOIC (8)
BODY SIZE (NOM)
2.90 mm × 1.60 mm
4.90 mm × 3.91 mm
4.90 mm × 3.91 mm
3.00 mm × 3.00 mm
2.92 mm × 1.60 mm
4.90 mm × 3.91 mm
LMH6645
High Speed Transducer Amp
SOIC (8)
LMH6646
LMH6647
VSSOP (8)
SOT-23 (6)
SOIC (8)
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Closed Loop Frequency Response
for Various Temperature
Frequency Response for Various AV
A
= +2
V
GAIN
A
= +1
V
0
-2
-4
GAIN
85°C
0
-2
-4
25°C
A
= +10
V
0
0
PHASE
50
PHASE
50
100
100
A
= +5
V
-40°C
1M
10M
Frequency (Hz)
200M
100k
100M 200M
100k
1M
10M
Frequency (Hz)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.