LMH6629 Ultra-Low Noise, High-Speed Operational Amplifier with Shutdown
November 2, 2010
LMH6629
Ultra-Low Noise, High-Speed Operational Amplifier with
Shutdown
General Description
The LMH6629 is a high-speed, ultra low-noise amplifier de-
signed for applications requiring wide bandwidth with high
gain and low noise such as in communication, test and mea-
surement, optical and ultrasound systems.
The LMH6629 operates on 2.7 to 5.5V supply with an input
common mode range that extends below ground and outputs
that swing to within 0.8V of the rails for ease of use in single
supply applications. Heavy loads up to ±250 mA can be driven
by high-frequency large signals with the LMH6629's –3dB
bandwidth of 900 MHz and 1600 V/µs slew rate. The
LMH6629 (LLP-8 package only) has user-selectable internal
compensation for minimum gains of 4 or 10 controlled by
pulling the COMP pin low or high, thereby avoiding the need
for external compensation capacitors required in competitive
devices. Compensation for the SOT23-5 package is internally
set for a minimum stable gain of 10 V/V. The LLP-8 package
also provides the power-down enable/ disable feature.
The low-input noise (0.69nV/
√
Hz and 2.6 pA/
√
Hz), low dis-
tortion (HD2/ HD3 = −90 dBc/−94 dBc) and ultra-low DC
errors (800 µV V
OS
maximum over temperature, ±0.45 µV/°C
drift) allow precision operation in both AC- and DC-coupled
applications.
The LMH6629 is fabricated in National Semiconductor’s pro-
prietary SiGe process and is available in a 3mm x 3mm 8-pin
LLP, as well as the SOT23-5, package.
Features
Specified for V
S
= 5V, R
L
= 100Ω,
A
V
= 10V/V LLP-8 package,
unless specified
900 MHz
■
–3dB bandwidth
0.69 nV/
√
Hz
■
Input voltage noise
±0.8 mV
■
Input offset voltage max. over temperature
1600 V/
μs
■
Slew rate
−90 dBc
■
HD2 @ f = 1MHz, 2V
PP
HD3 @ f = 1MHz, 2V
PP
−94 dBc
■
2.7V to 5.5V
■
Supply voltage range
15.5 mA
■
Typical supply current
≥
4 or
≥
10 V/V
■
Selectable min. gain
75 ns
■
Enable Time
±250 mA
■
Output Current
LLP-8 and SOT23-5 Packages
■
Applications
■
■
■
■
■
■
■
■
Instrumentation Amplifiers
Ultrasound Pre-amps
Wide-band Active Filters
Opto-electronics
Medical imaging systems
Base-station Amplifiers
Low-Noise Single Ended to Differential Conversion
Trans-impedance amplifier
Typical Application Circuit
30068011
FIGURE 1. Transimpedance Amplifier
© 2010 National Semiconductor Corporation
300680
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LMH6629
Ordering Information
Package
LLP-8
Part Number
LMH6629SD
LMH6629SDE
LMH6629SDX
LMH6629MF
SOT23-5
LMH6629MFE
LM6629MFX
AE7A
L6629
Package Marking
Transport Media
1k Units Tape and Reel
250 Units Tape and Reel
4.5k Units Tape and Reel
1k Units Tape and Reel
250 Units Tape and Reel
3k Units Tape and Reel
MF05A
SDA08A
NSC Drawing
Connection Diagrams
30068001
30068052
LLP-8 (Top View)
SOT23-5 (Top View)
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2
LMH6629
Absolute Maximum Ratings
(Note
1, Note
2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Tolerance (Note
4)
Human Body Model
Machine Model
Charge-Device Model
Positive Supply Voltage
Differential Input Voltage
Analog Input Voltage Range
Digital Input Voltage
2kV
200V
750V
−0.5 to 6.0V
3V
−0.5 to V
S
−0.5 to V
S
Junction Temperature
+150°C
Storage Temperature Range
−65°C to +150°C
Soldering Information
See Product Folder at www.national.com and http://
www.national.com/ms/MS/MS-SOLDERING.pdf
Operating Ratings
Supply Voltage (V+ - V−
Operating Temperature Range
Package
LLP-8
SOT23-5
(Note
1)
2.7V to 5.5V
−40°C to +125°C
(θ
JA
)
71°C/W
179°C/W
5V Electrical Characteristics
The following specifications apply for single supply with V
S
= 5V, R
L
= 100Ω
terminated to 2.5V, gain = 10V/V, V
O
= 2V
PP
, V
CM
=
V
S
/2, COMP Pin = HI (LLP-8 package), unless otherwise noted.
Boldface
limits apply at the temperature extremes. (Note
2).
Symbol
Parameter
Conditions
Min
(Note
6)
Typ
(Note
6)
900
1000
800
380
190
330
190
95
0
dB
2
1600
530
0.90
0.95
ns
2.8
42
2
V/μs
MHz
MHz
MHz
Max
(Note
6)
Units
DYNAMIC PERFORMANCE
V
O
= 200 mV
PP
, LLP-8 package
SSBW
Small signal −3dB
bandwidth
V
O
= 200 mV
PP
, SOT23-5 package
A
V
= 4, V
O
= 200 mV
PP
,
COMP Pin = LO
V
O
= 2V
PP
COMP Pin = LO, A
V
= 4, V
O
= 2V
PP
A
V
= 10, V
O
= 200 mV
PP
,
LLP-8 package
0.1 dB bandwidth
A
V
= 10, V
O
= 200 mV
PP
,
SOT23-5 package
A
V
= 4, V
O
= 200 mV
PP
,
COMP Pin = LO
V
O
= 200 mV
PP
,
LLP-8 package
V
O
= 200 mV
PP
,
SOT23-5 package
A
V
= 10, 2V step
SR
Slew rate
A
V
= 4, 2V step,
COMP Pin = LO
A
V
= 10, 2V step, 10% to 90%,
LLP-8 package
t
r
/ t
f
Rise/fall time
A
V
= 10, 2V step, 10% to 90%, SOT23-5
package
A
V
= 4, 2V step, 10% to 90%,
COMP Pin = LO, (Slew Rate Limited)
T
s
Settling time
Overload Recovery
A
V
= 10, 1V step, ±0.1%
V
IN
= 1V
PP
LSBW
Large signal −3dB
bandwidth
Peaking
3
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LMH6629
Symbol
Parameter
Conditions
Min
(Note
6)
Typ
(Note
6)
−90
−88
−70
−65
−94
−87
−82
−75
31
27
0.69
2.6
8.0
Max
(Note
6)
Units
NOISE AND DISTORTION
fc = 1MHz, V
O
= 2V
PP
COMP Pin = LO, A
V
= 4, fc = 1 MHz, V
O
= 2V
PP
fc = 10 MHz, V
O
= 2V
PP
COMP Pin = LO, fc = 10 MHz,
A
V
= 4V, V
O
= 2V
PP
fc = 1MHz, V
O
= 2V
PP
COMP Pin = LO, A
V
= 4, fc = 1MHz, V
O
= 2V
PP
fc = 10 MHz, V
O
= 2V
PP
COMP Pin = LO, fc = 10 MHz,
V
O
= 2V
PP
OIP3
e
n
i
n
NF
ANALOG I/O
CMRR > 70 dB, LLP-8 package
CMVR
Input voltage range
CMRR > 70 dB, SOT23-5 package
R
L
= 100Ω
to V
S
/2
V
O
Output voltage range
No Load
I
OUT
V
OS
TcV
OS
I
BI
I
OS
T
C
I
OS
C
CM
R
CM
Linear output current
Input offset voltage
Input offset voltage
temperature drift
Input bias current
Input offset current
Input offset voltage
temperature drift
Input capacitance
Input resistance
(Note
7)
Common Mode
Common Mode
82
70
81
78
LLP-8 package
SOT23-5 package
74
72
(Note
7)
(Note
6)
V
O
= 2.5V (Note
3)
0.89
0.95
0.76
0.85
−0.30
−0.30 to
3.8
0.82 to
4.19
0.72 to
4.28
250
±150
±0.45
−15
±0.1
±2.8
1.7
450
−23
−37
±1.8
±3.0
±780
±800
4.0
3.9
4.1
4.0
3.8
V
Two-tone 3
rd
order
intercept point
Noise Voltage
Noise current
Noise Figure
fc = 25 MHz, V
O
= 2 V
PP
composite
fc = 75 MHz, V
O
= 2V
PP
composite
Input referred f > 1MHz
R
S
= R
T
= 50Ω
HD2
2
nd
order distortion
dBc
HD3
3
rd
order distortion
dBc
dBm
nV/
√
Hz
pA/
√
Hz
dB
V
mA
µV
μV/°C
μA
μA
nA/°C
pF
kΩ
MISCELLANEOUS PARAMETERS
CMRR
Common mode rejection V
CM
from 0V to 3.7V, LLP-8 package
ratio
V
CM
from 0V to 3.7V, SOT23-5 package
Power supply rejection
ratio
Open loop gain
87
87
83
78
78
dB
PSRR
A
VOL
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4
LMH6629
Symbol
Parameter
Conditions
Min
(Note
6)
Typ
(Note
6)
Max
(Note
6)
Units
DIGITAL INPUTS/TIMING
V
IL
V
IH
I
IL
I
IH
T
en
T
dis
Logic low-voltage
threshold
Logic high-voltage
threshold
Logic low-bias current
Logic high-bias current
Enable time
Disable time
PD and COMP pins, , LLP-8 package
PD and COMP pins, LLP-8 package
PD and COMP pins = 0.8V, , LLP-8
package(Note
6)
PD and COMP pins = 2.5V, LLP-8
package(Note
6)
LLP-8 package
LLP-8 package
No Load, Normal Operation (PD Pin = HI
or open for LLP-8 package)
No Load, Shutdown (PD Pin =LO for
LLP-8 package)
2.5
−23
−19
−16
−14
−28
−22
75
80
16.7
18.2
1.85
2.0
−34
−38
−27
−29
0.8
V
µA
ns
POWER REQUIREMENTS
15.5
1.1
I
S
Supply Current
mA
5
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