LMH6645 Datasheet, PDF (1/28 Pages) National Semiconductor (TI) – 2.7V, 650μA, 55MHz, Rail-to-Rail Input and Output Amplifiers with Shutdown Option

LMH6645, LMH6646, LMH6647
www.ti.com
SNOS970C – JUNE 2001 – REVISED APRIL 2013
LMH6645/46/47 2.7V, 650μA, 55MHz, Rail-to-Rail Input and Output Amplifiers with
Shutdown Option
Check for Samples: LMH6645, LMH6646, LMH6647
FEATURES
1
(V 23
S
=
2.7V,
T_A
=
25°C,
R_L
=
1kΩ
to
V⁺/2,
A_V
=
+1. Typical values unless specified).
• −3dB BW 55MHz
• Supply Voltage Range 2.5V to 12V
• Slew Rate 22V/μs
• Supply Current 650μA/channel
• Output Short Circuit Current 42mA
• Linear Output Current ±20mA
• Input Common Mode Voltage 0.3V Beyond
Rails
• Output Voltage Swing 20mV from Rails
• Input Voltage Noise 17nV/√Hz
• Input Current Noise 0.75pA/√Hz
APPLICATIONS
• Active filters
• High speed portable devices
• Multiplexing applications (LMH6647)
• Current sense buffer
• High speed transducer amp
DESCRIPTION
The LMH™6645 (single) and LMH6646 (dual), rail-to-
rail input and output voltage feedback amplifiers, offer
high speed (55MHz), and low voltage operation
(2.7V) in addition to micro-power shutdown capability
(LMH6647, single).
Input common mode voltage range exceeds either
supply by 0.3V, enhancing ease of use in multitude of
applications where previously only inferior devices
could be used. Output voltage range extends to
within 20mV of either supply rails, allowing wide
dynamic range especially in low voltage applications.
Even with low supply current of 650μA/amplifier,
output current capability is kept at a respectable
±20mA 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.
In portable applications, the LMH6647 provides
shutdown capability while keeping the turn-off current
to less than 50μA. Both turn-on and turn-off
characteristics are well behaved with minimal output
fluctuations during transitions. This allows the part to
be used in power saving mode, as well as
multiplexing applications. Miniature packages (SOT-
23, VSSOP-8, and SOIC-8) are further means to
ease the adoption of these low power high speed
devices in applications where board area is at a
premium.
Connection Diagram
1
OUTPUT
V^{- 2}
3
+IN
+
-
5 _V+
1
OUTPUT
4
-IN
V^{- 2}
3
+IN
+^-
6 _V+
5
SD
4
-IN
1
N/C
2
-IN
-
3
+IN
+
V^{- 4}
8
N/C
7 _V+
6
OUTPUT
5
N/C
Figure 1. SOT-23-5 (LMH6645)
Package Number DBV0005A
Top View
Figure 2. SOT-23-6 (LMH6647)
Package Number DBV0006A
Top View
Figure 3. SOIC-8 (LMH6645)
Package Number D0008A
Top View
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
LMH is a trademark of Texas Instruments.
2
All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2001–2013, Texas Instruments Incorporated