LMH6628
Dual Wideband, Low Noise, Voltage Feedback Op Amp
General Description
The National LMH6628 is a high speed dual op amp that
offers a traditional voltage feedback topology featuring unity
gain stability and slew enhanced circuitry. The LMH6628's
low noise and very low harmonic distortion combine to form
a wide dynamic range op amp that operates from a single
(5V to 12V) or dual (
5V) power supply.
Each of the LMH6628's closely matched channels provides
a 300MHz unity gain bandwidth and low input voltage noise
density (2nV/
). Low 2nd/3rd harmonic distortion (-65/
-74dBc at 10MHz) make the LMH6628 a perfect wide dy-
namic range amplifier for matched I/Q channels.
With its fast and accurate settling (12ns to 0.1%), the
LMH6628 is also an excellent choice for wide dynamic
range, anti-aliasing filters to buffer the inputs of hi resolution
analog-to-digital converters. Combining the LMH6628's two
tightly matched amplifiers in a single 8-pin SOIC package
reduces cost and board space for many composite amplifier
applications such as active filters, differential line drivers/
receivers, fast peak detectors and instrumentation amplifi-
ers.
The LMH6628 is fabricated using National's VIP10
TM
com-
plimentary bipolar process.
To reduce design times and assist in board layout, the
LMH6628
is
supported
by
an
evaluation
board
(CLC730036).
Features
n
Wide unity gain bandwidth: 300MHz
n
Low noise: 2nV/
n
Low Distortion: -65/-74dBc (10MHz)
n
Settling time: 12ns to 0.1%
n
Wide supply voltage range:
2.5V to
6V
n
High output current:
85mA
n
Improved replacement for CLC428
Applications
n
High speed dual op amp
n
Low noise integrators
n
Low noise active filters
n
Driver/receiver for transmission systems
n
High speed detectors
n
I/Q channel amplifiers
Connection Diagram
8-Pin SOIC
20038535
Top View
Inverting Frequency Response
20038515
January 2003
LMH6628
Dual
W
ideband,
Low
Noise,
V
oltage
Feedback
Op
Amp
2003 National Semiconductor Corporation
DS200385
www.national.com
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 (Note 4)
Human Body Model
2kV
Machine Model
200V
Supply Voltage
13.5
Short Circuit Current
(Note 3)
Common-Mode Input Voltage
V
+
- V
-
Differential Input Voltage
V
+
- V
-
Maximum Junction Temperature
+150C
Storage Temperature Range
-65C to +150C
Lead Temperature (soldering 10 sec)
+300C
Operating Ratings
(Note 1)
Thermal Resistance (Note 5)
Package
(
JC
)
(
JA
)
SOIC
65C/W
145C/W
Temperature Range
-40C to +85C
Nominal Supply Voltage
2.5V to
6V
Electrical Characteristics
(Note 2)
V
CC
=
5V, A
V
= +2V/V, R
F
= 100
, R
G
= 100
, R
L
= 100
; unless otherwise specified. Boldface limits apply at the
temperature extremes.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Frequency Domain Response
GB
Gain Bandwidth Product
V
O
<
0.5V
PP
200
MHz
SSBW
-3dB Bandwidth, A
V
= +1
V
O
<
0.5V
PP
180
300
MHz
SSBW
-3dB Bandwidth, A
V
= +2
V
O
<
0.5V
PP
100
MHz
GFL
Gain Flatness
V
O
<
0.5V
PP
GFP
Peaking
DC to 200MHz
0.0
dB
GFR
Rolloff
DC to 20MHz
.1
dB
LPD
Linear Phase Deviation
DC to 20MHz
.1
deg
Time Domain Response
TR
Rise and Fall Time
1V Step
4
ns
TS
Settling Time
2V Step to 0.1%
12
ns
OS
Overshoot
1V Step
1
%
SR
Slew Rate
4V Step
300
550
V/s
Distortion And Noise Response
HD2
2nd Harmonic Distortion
1V
PP
, 10MHz
-65
dBc
HD3
3rd Harmonic Distortion
1V
PP
, 10MHz
-74
dBc
Equivalent Input Noise
V
N
Voltage
1MHz to 100MHz
2
nV/
I
N
Current
1MHz to 100MHz
2
pA/
XTLKA
Crosstalk
Input Referred, 10MHz
-62
dB
Static, DC Performance
G
OL
Open-Loop Gain
56
53
63
dB
V
IO
Input Offset Voltage
.5
2
2.6
mV
DV
IO
Average Drift
5
V/C
I
BN
Input Bias Current
.7
20
30
A
DI
BN
Average Drift
150
nA/C
I
OS
Input Offset Current
0.3
6
A
I
OSD
Average Drift
5
nA/C
PSRR
Power Supply Rejection Ratio
60
46
70
dB
CMRR
Common-Mode Rejection Ratio
57
54
62
dB
I
CC
Supply Current
Per Channel, R
L
=
7.5
7.0
9
12
12.5
mA
LMH6628
www.national.com
2
Electrical Characteristics
(Note 2) (Continued)
V
CC
=
5V, A
V
= +2V/V, R
F
= 100
, R
G
= 100
, R
L
= 100
; unless otherwise specified. Boldface limits apply at the
temperature extremes.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
Miscellaneous Performance
R
IN
Input Resistance
Common-Mode
500
k
Differential-Mode
200
k
C
IN
Input Capacitance
Common-Mode
1.5
pF
Differential-Mode
1.5
pF
R
OUT
Output Resistance
Closed-Loop
.1
V
O
Output Voltage Range
R
L
=
3.8
V
V
OL
R
L
= 100
3.2
3.1
3.5
V
CMIR
Input Voltage Range
Common- Mode
3.7
V
I
O
Output Current
50
85
mA
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications, see the Electrical Characteristics tables.
Note 2: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of
the device such that T
J
= T
A
. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self heating where T
J
>
T
A
.
See Note 6 for information on temperature de-rating of this device." Min/Max ratings are based on product characterization and simulation. Individual parameters
are tested as noted.
Note 3: Output is short circuit protected to ground, however maximum reliability is obtained if output current does not exceed 160mA.
Note 4: Human body model, 1.5k
in series with 100pF. Machine model, 0 In series with 200pF.
Note 5: The maximum power dissipation is a function of T
J(MAX)
,
JA
and T
A
. The maximum allowable power dissipation at any ambient temperature is
P
D
= (T
J(MAX)
-T
A
)/
JA
. All numbers apply for packages soldered directly onto a PC board.
Ordering Information
Package
Part Number
Package Marking
Transport Media
NSC Drawing
8-pin SOIC
LMH6628MA
LMH6628MA
Rails
M08A
LMH6628MAX
2.5k Units Tape and Reel
LMH6628
www.national.com
3
Typical Performance Characteristics
(T
A
= +25, A
V
= +2, V
CC
=
5V, R
f
=100
, R
L
= 100
, un-
less specified)
Non-Inverting Frequency Response
Inverting Frequency Response
20038513
20038515
Frequency Response vs. Load Resistance
Frequency Response vs. Output Amplitude
20038525
20038510
Frequency Response vs. Capacitive Load
Gain Flatness & Linear Phase
20038516
20038524
LMH6628
www.national.com
4
Typical Performance Characteristics
(T
A
= +25, A
V
= +2, V
CC
=
5V, R
f
=100
, R
L
= 100
,
unless specified) (Continued)
Channel Matching
Channel to Channel Crosstalk
20038514
20038509
Pulse Response (V
O
= 2V)
Pulse Response (V
O
= 100mV)
20038511
20038512
2nd Harmonic Distortion vs. Output Voltage
3rd Harmonic Distortion vs. Output Voltage
20038507
20038508
LMH6628
www.national.com
5
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