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LMH6645/46/47 2.7V, 650µA, 55MHz, Rail-to-Rail Input and Output Amplifiers with Shutdown
Option
June 2005
LMH6645/46/47
2.7V, 650µA, 55MHz, Rail-to-Rail Input and Output
Amplifiers with Shutdown Option
General 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 appli-
cations. 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 inde-
pendent 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 be-
haved with minimal output fluctuations during transitions.
This allows the part to be used in power saving mode, as
well as multiplexing applications. Miniature packages
(SOT23, MSOP-8, and SO-8) are further means to ease the
adoption of these low power high speed devices in applica-
tions where board area is at a premium.
Features
(V
S
= 2.7V, T
A
= 25˚C, R
L
= 1kΩ to V
+
/2, A
V
= +1. Typical
values unless specified).
n
−3dB BW
55MHz
n
Supply voltage range
2.5V to 12V
n
Slew rate
22V/µs
n
Supply current
650µA/channel
n
Output short circuit current
42mA
±
20mA
n
Linear output current
n
Input common mode voltage
0.3V beyond rails
n
Output voltage swing
20mV from rails
n
Input voltage noise
17nV/
n
Input current noise
0.75pA/
Applications
n
n
n
n
n
Active filters
High speed portable devices
Multiplexing applications (LMH6647)
Current sense buffer
High speed transducer amp
Connection Diagrams
SOT23-5 (LMH6645)
SOT23-6 (LMH6647)
SOIC-8 (LMH6645)
20020259
20020260
Top View
Top View
20020261
Top View
LMH
™
is a trademark of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation
DS200202
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LMH6645/46/47
SOIC-8 (LMH6647)
SOIC-8 and MSOP-8
(LMH6646)
20020262
20020263
Top View
Top View
Ordering Information
Package
5-Pin SOT-23
6-Pin SOT-23
SOIC-8
Part Number
LMH6645MF
LMH6645MFX
LMH6647MF
LMH6647MFX
LMH6645MA
LMH6645MAX
LMH6646MA
LMH6646MAX
LMH6647MA
LMH6647MAX
MSOP-8
LMH6646MM
LMH6646MMX
A70A
LMH6647MA
LMH6646MA
LMH6645MA
A69A
Package Marking
A68A
Transport Media
1k Units Tape and Reel
3k Units Tape and Reel
1k Units Tape and Reel
3k Units Tape and Reel
95 Units Rails
2.5k Units Tape and Reel
95 Units Rails
2.5k Units Tape and Reel
95 Units Rails
2.5k Units Tape and Reel
1k Units Tape and Reel
3.5k Units Tape and Reel
MUA08A
M08A
MF06A
NSC Drawing
MF05A
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2
LMH6645/46/47
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
Machine Model
V
IN
Differential
Output Short Circuit Duration
Supply Voltage (V
+
- V
−
)
Voltage at Input/Output pins
Storage Temperature Range
Junction Temperature (Note 4)
2KV (Note 2)
200V (Note 9)
Soldering Information
Infrared or Convection (20 sec)
Wave Soldering (10 sec)
235˚C
260˚C
Operating Ratings
(Note 1)
Supply Voltage (V
+
– V
−
)
Temperature Range (Note 4)
Package Thermal Resistance (Note 4) (θ
JA
)
SOT23-5
SOT23-6
SOIC-8
MSOP-8
265˚C/W
265˚C/W
190˚C/W
235˚C/W
2.5V to 12V
−40˚C to +85˚C
±
2.5V
(Note 3, 11)
12.6V
V
+
+0.8V, V
−
−0.8V
−65˚C to +150˚C
+150˚C
2.7V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for at T
J
= 25˚C, V
+
= 2.7V, V
−
= 0V, V
CM
= V
O
= V
+
/2, and R
f
= 2kΩ, and R
L
= 1kΩ to V
+
/2.
Boldface
limits apply at the temperature extremes.
Symbol
BW
e
n
i
n
CT Rej.
SR
T
ON
T
OFF
TH
SD
I
SD
V
OS
TC V
OS
I
B
−3dB BW
Input-Referred Voltage Noise
Input-Referred Current Noise
Cross-Talk Rejection
(LMH6646 only)
Slew Rate
Turn-On Time
(LMH6647 only)
Turn-Off Time
(LMH6647 only)
Shutdown Threshold
(LMH6647 only)
Shutdown Pin Input Current
(LMH6647 only)
Input Offset Voltage
Input Offset Average Drift
Input Bias Current
I
S
≤
50µA
(Note 7)
0V
≤
V
CM
≤
2.7V
(Note 12)
V
CM
= 2.5V (Note 7)
V
CM
= 0.5V (Note 7)
I
OS
R
IN
C
IN
CMVR
Input Offset Current
Common Mode Input
Resistance
Common Mode Input
Capacitance
Input Common-Mode Voltage
Range
CMRR
≥
50dB
3.0
2.8
0V
≤
V
CM
≤
2.7V
−3
−4
Parameter
Conditions
A
V
= +1, V
OUT
= 200mV
PP
,
V
CM
= 0.7V
f = 100kHz
f = 1kHz
f = 100kHz
f = 1kHz
f = 5MHz, Receiver:
R
f
= R
g
= 510Ω, A
V
= +2
A
V
= −1, V
O
= 2V
PP
(Note 8, 13)
15
Min
(Note 6)
40
Typ
(Note 5)
55
17
25
0.75
1.20
47
22
250
560
1.95
−20
2.30
Max
(Note 6)
Units
MHz
nV/
pA/
dB
V/µs
ns
ns
V
µA
±
1
±
5
0.40
−0.68
1
3
2
−0.5
3.2
3
4
2
2.2
−2
−2.2
500
mV
µV/˚C
µA
nA
MΩ
pF
−0.3
−0.1
V
3
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LMH6645/46/47
2.7V Electrical Characteristics
Symbol
CMRR
A
VOL
V
O
Parameter
Common Mode Rejection
Ratio
Large Signal Voltage Gain
Output Swing
High
Output Swing
Low
I
SC
Output Short Circuit Current
(Continued)
Unless otherwise specified, all limits guaranteed for at T
J
= 25˚C, V
+
= 2.7V, V
−
= 0V, V
CM
= V
O
= V
+
/2, and R
f
= 2kΩ, and R
L
= 1kΩ to V
+
/2.
Boldface
limits apply at the temperature extremes.
Conditions
V
CM
Stepped from 0V to 2.7V
V
CM
Stepped from 0V to 1.55V
V
O
= 0.35V to 2.35V
R
L
= 1k to V
+
/2
R
L
= 10k to V
+
/2
R
L
= 1k to V
+
/2
R
L
= 10k to V /2
Sourcing to V
−
V
ID
= 200mV (Note 10)
Sinking to V
+
V
ID
= −200mV (Note 10)
I
OUT
PSRR
I
S
Output Current
Power Supply Rejection Ratio
Supply Current (per channel)
V
OUT
= 0.5V from rails
V
+
= 2.7V to 3.7V or
V
−
= 0V to −1V
Normal Operation
Shutdown Mode (LMH6647 only)
75
+
Min
(Note 6)
46
58
76
74
2.55
Typ
(Note 5)
77
76
87
2.66
2.68
40
20
43
42
Max
(Note 6)
Units
dB
dB
V
150
mV
mA
±
20
83
650
15
1250
50
mA
dB
µA
5V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for at T
J
= 25˚C, V
+
= 5V, V
−
= 0V, V
CM
= V
O
= V
+
/2, and R
f
= 2kΩ, and R
L
= 1kΩ to V
+
/2.
Boldface
limits apply at the temperature extremes.
Symbol
BW
e
n
i
n
CT Rej.
SR
T
ON
T
OFF
TH
SD
I
SD
V
OS
TC V
OS
I
B
−3dB BW
Input-Referred Voltage Noise
Input-Referred Current Noise
Cross-Talk Rejection
(LMH6646 only)
Slew Rate
Turn-On Time (LMH6647 only)
Turn-Off Time (LMH6647 only)
Shutdown Threshold
(LMH6647 only)
Shutdown Pin Input Current
(LMH6647 only)
Input Offset Voltage
Input Offset Average Drift
Input Bias Current
I
S
≤
50µA
(Note 7)
0V
≤
V
CM
≤
5V
(Note 12)
V
CM
= 4.8V (Note 7)
V
CM
= 0.5V (Note 7)
I
OS
R
IN
Input Offset Current
Common Mode Input
Resistance
4
Parameter
Conditions
A
V
= +1, V
OUT
= 200mV
PP
f = 100kHz
f = 1kHz
f = 100kHz
f = 1kHz
f = 5MHz, Receiver:
R
f
= R
g
= 510Ω, A
V
= +2
A
V
= −1, V
O
= 2V
PP
(Note 8, 13)
Min
(Note 6)
40
Typ
(Note 5)
55
17
25
0.75
1.20
47
Max
(Note 6)
Units
MHz
nV/
pA/
dB
V/µs
ns
ns
15
22
210
500
4.25
4.60
V
−20
−3
−4
µA
3
4
+2
−2.2
−2
−2.2
500
mV
µV/C
±
1
±
5
+0.36
−0.68
1
3
µA
0V
≤
V
CM
≤
5V
nA
MΩ
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