LMH6702
Ultra Low Distortion, Wideband Op Amp
General Description
The LMH6702 is a very wideband, DC coupled monolithic
operational amplifier designed specifically for wide dynamic
range systems requiring exceptional signal fidelity. Benefit-
ing from National's current feedback architecture, the
LMH6702 offers unity gain stability at exceptional speed
without need for external compensation.
With its 720MHz bandwidth (A
V
= 2V/V, V
O
= 2V
PP
), 10-bit
distortion levels through 60MHz (R
L
= 100
), 1.83nV/
input referred noise and 12.5mA supply current, the
LMH6702 is the ideal driver or buffer for high-speed flash
A/D and D/A converters.
Wide dynamic range systems such as radar and communi-
cation receivers, requiring a wideband amplifier offering ex-
ceptional signal purity, will find the LMH6702's low input
referred noise and low harmonic and intermodulation distor-
tion make it an attractive high speed solution.
The LMH6702 is constructed using National's VIP10
TM
com-
plimentary bipolar process and National's proven current
feedback architecture. The LMH6702 is available in SOIC
and SOT23-5 packages.
Features
V
S
=
5V, T
A
= 25C, A
V
= +2V/V, R
L
= 100
, V
OUT
= 2V
PP
,
Typical unless Noted:
n
2
nd
/3
rd
Harmonics (5MHz, SOT23-5)
-100/-96dBc
n
-3dB Bandwidth (V
OUT
= 2V
PP
)
720MHz
n
Low noise
1.83nV/
n
Fast settling to 0.1%
13.4ns
n
Fast slew rate
3100V/s
n
Supply current
12.5mA
n
Output current
80mA
n
Low Intermodulation Distortion (75MHz)
-67dBc
n
Improved Replacement for CLC409 and CLC449
Applications
n
Flash A/D driver
n
D/A transimpedance buffer
n
Wide dynamic range IF amp
n
Radar/communication receivers
n
Line driver
n
High resolution video
Inverting Frequency Response
Harmonic Distortion vs. Load and Frequency
20039002
20039007
June 2003
LMH6702
Ultra
Low
Distortion,
W
ideband
Op
Amp
2003 National Semiconductor Corporation
DS200390
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.
V
S
6.75V
I
OUT
(Note 3)
Common Mode Input Voltage
V
-
to V
+
Maximum Junction Temperature
+150C
Storage Temperature Range
-65C to +150C
Soldering Information
Infrared or Convection (20 sec.)
235C
Wave Soldering (10 sec.)
260C
ESD Tolerance (Note 4)
Human Body Model
2000V
Machine Model
200V
Storage Temperature Range
-65C to +150C
Operating Ratings
(Note 1)
Thermal Resistance
Package
(
JC
)
(
JA
)
8-Pin SOIC
75C/W
160C/W
5-Pin SOT23
120C/W
187C/W
Operating Temperature
-40C to +85C
Nominal Supply Voltage
5V to
6V
Electrical Characteristics
(Note 2)
A
V
= +2, V
S
=
5V, R
L
= 100
, R
F
= 237
; unless specified
Symbol
Parameter
Conditions
Min
(Note 6)
Typ
(Note 6)
Max
(Note 6)
Units
Frequency Domain Performance
SSBW
LG
-3dB Bandwidth
V
OUT
= 2V
PP
720
MHz
LSBW
LG
V
OUT
= 4V
PP
480
SSBW
HG
V
OUT
= 2V
PP
, A
V
= +10
140
GF
0.1dB
0.1dB Gain Flatness
V
OUT
= 2V
PP
120
MHz
LPD
Linear Phase Deviation
DC to 100MHz
0.09
deg
DG
Differential Gain
R
L
=150
, 3.58MHz/4.43MHz
0.024/0.021
%
DP
Differential Phase
R
L
= 150
, 3.58MHz/4.43MHz
0.004/0.007
deg
Time Domain Response
TRS/TRL
Rise and Fall Time
2V Step
0.87/0.77
ns
6V Step
1.70/1.70
ns
OS
Overshoot
2V Step
0
%
SR
Slew Rate
6V
PP
, 40% to 60% (Note 5)
3100
V/s
T
s
Settling Time to 0.1%
2V Step
13.4
ns
Distortion And Noise Response
HD2L
2
nd
Harmonic Distortion
2V
PP
, 5MHz (Note 9)
(SOT23-5/SOIC)
-100/ -87
dBc
HD2
2V
PP
, 20MHz (Note 9)
(SOT23-5/SOIC)
-79/ -72
dBc
HD2H
2V
PP
, 60MHz (Note 9)
(SOT23-5/SOIC)
-63/ -64
dBc
HD3L
3
rd
Harmonic Distortion
2V
PP
, 5MHz (Note 9)
(SOT23-5/SOIC)
-96/ -98
dBc
HD3
2V
PP
, 20MHz (Note 9)
(SOT23-5/SOIC)
-88/ -82
dBc
HD3H
2V
PP
, 60MHz (Note 9)
(SOT23-5/SOIC)
-70/ -65
dBc
OIM3
IMD
75MHz, P
O
= 10dBm/ tone
-67
dBc
V
N
Input Referred Voltage Noise
>
1MHz
1.83
nV/
I
N
Input Referred Inverting Noise
Current
>
1MHz
18.5
pA/
I
NN
Input Referred Non-Inverting
Noise Current
>
1MHz
3.0
pA/
SNF
Total Input Noise Floor
>
1MHz
-158
dBm
1Hz
INV
Total Integrated Input Noise
1MHz to 150MHz
35
V
LMH6702
www.national.com
2
Electrical Characteristics
(Note 2) (Continued)
A
V
= +2, V
S
=
5V, R
L
= 100
, R
F
= 237
; unless specified
Symbol
Parameter
Conditions
Min
(Note 6)
Typ
(Note 6)
Max
(Note 6)
Units
Static, DC Performance
V
IO
Input Offset Voltage
1.0
4.5
6.0
mV
DV
IO
Input Offset Voltage Average
Drift
(Note 8)
-13
V/C
I
BN
Input Bias Current
Non-Inverting (Note 7)
-6
15
21
A
DI
BN
Input Bias Current Average Drift
Non-Inverting (Note 8)
+40
nA/C
I
BI
Input Bias Current
Inverting (Note 7)
-8
30
34
A
DI
BI
Input Bias Current Average Drift
Inverting (Note 8)
-10
nA/C
PSRR
Power Supply Rejection Ratio
DC
47
45
52
dB
CMRR
Common Mode Rejection Ration
DC
45
44
48
dB
I
CC
Supply Current
R
L
=
11.0
10.0
12.5
16.1
17.5
mA
Miscellaneous Performance
R
IN
Input Resistance
Non-Inverting
1.4
M
C
IN
Input Capacitance
Non-Inverting
1.6
pF
R
OUT
Output Resistance
Closed Loop
30
m
V
OL
Output Voltage Range
R
L
= 100
3.3
3.2
3.5
V
CMIR
Input Voltage Range
Common Mode
1.9
2.2
V
I
O
Output Current
50
80
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
.
Min/Max ratings are based on production testing unless otherwise specified.
Note 3: The maximum output current (I
OUT
) is determined by device power dissipation limitations.
Note 4: Human body model: 1.5k
in series with 100pF. Machine model: 0 in series with 200pF.
Note 5: Slew Rate is the average of the rising and falling edges.
Note 6: Typical numbers are the most likely parametric norm. Bold numbers refer to over temperature limits.
Note 7: Negative input current implies current flowing out of the device.
Note 8: Drift determined by dividing the change in parameter at temperature extremes by the total temperature change.
Note 9: Harmonic distortion is strongly influenced by package type (SOT23-5 or SOIC). See Application Note section under "Harmonic Distortion" for more
information.
LMH6702
www.national.com
3
Connection Diagrams
8-Pin SOIC
5-Pin SOT23
20039024
Top View
20039025
Top View
Ordering Information
Package
Part Number
Package Marking
Transport Media
NSC Drawing
8-pin SOIC
LMH6702MA
LMH6702MA
95 Units/Rail
M08A
LMH6702MAX
2.5k Units Tape and Reel
5-Pin SOT23
LMH6702MF
A83A
1k Units Tape and Reel
MF05A
LMH6702MFX
3k Units Tape and Reel
LMH6702
www.national.com
4
Typical Performance Characteristics
(T
A
= 25C, V
S
=
5V, R
L
= 100
, R
f
= 237
; Unless Speci-
fied).
Non-Inverting Frequency Response
Inverting Frequency Response
20039001
20039002
Frequency Response for Various R
L
's, A
V
= +2
Frequency Response for Various R
L
's, A
V
= +4
20039018
20039017
Step Response, 2V
PP
Step Response, 6V
PP
20039005
20039006
LMH6702
www.national.com
5
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