LMH6672
Dual, High Output Current, High Speed Op Amp
General Description
The LMH6672 is a low cost, dual high speed op amp capable
of driving signals to within 1V of the power supply rails. It
features the high output drive with low distortion required for
the demanding application of a single supply xDSL line
driver.
When connected as a differential output driver, the LMH6672
can drive a 50
load to 16.8V
PP
swing with only -93dBc
distortion, fully supporting the peak upstream power levels
for upstream full-rate ADSL. The LMH6672 is fully specified
for operation with 5V and 12V supplies. Ideal for PCI modem
cards and xDSL modems.
Applications
n
ADSL PCI modem cards
n
xDSL external modems
n
Line drivers
Features
n
High Output Drive
19.2V
PP
differential output voltage, R
L
= 50
9.6V
PP
single-ended output voltage, R
L
= 25
n
High Output Current
200mA
@
V
O
= 9
VPP
, V
S
= 12V
n
Low Distortion
93dB SFDR
@
100KHz, V
O
= 8.4V
PP
, R
L
= 25
92dB SFDR
@
1MHz, V
O
= 2V
PP
, R
L
= 100
n
High Speed
130MHz 3dB bandwidth (G = 2)
160V/s slew rate
n
Low Noise
4.5nV/
: input noise voltage
1.7pA/
: input noise current
n
Low supply current: 6.2mA/amp
n
Single-supply operation: 5V to 12V
n
Available in 8-pin SOIC, PSOP and LLP
Connection Diagram
8-Pin SOIC/PSOP/LLP
20016602
Top View
Typical Application
20016601
Figure 1
Ordering Information
Package
Part Number
Package Marking
Transport Media
NSC Drawing
8-Pin SOIC
LMH6672MA
LMH6672MA
Rails
M08A
LMH6672MAX
LMH6672MA
2.5k Units Tape and Reel
8-Pin PSOP
LMH6672MR
LMH6672MR
Rails
MRA08A
LMH6672MRX
LMH6672MR
2.5k Units Tape and Reel
8-Pin LLP
LMH6672LD
L6672LD
1k Units Tape and Reel
LDC08A
LMH6672LDX
L6672LD
4.5k Units Tape and Reel
January 2002
LMH6672
Dual,
High
Output
Current,
High
Speed
Op
Amp
2002 National Semiconductor Corporation
DS200166
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 2)
Human Body Model
2kV
Machine Model
200V
V
IN
Differential
1.2V
Output Short Circuit Duration
(Note 2)
Supply Voltage (V
+
- V
-
)
13.2V
Voltage at Input/Output pins
V
+
+0.8V, V
-
-0.8V
Storage Temperature Range
-65C to +150C
Junction Temperature
+150C (Note 4)
Soldering Information
Infrared or Convection (20 sec)
235C
Wave Soldering (10 sec)
260C
Operating Ratings
(Note 1)
Supply Voltage (V
+
- V
-
)
2.5V to
6.5V
Junction Temperature Range
-40C to 150C
Package Thermal Resistance (
JA
)
8-pin SOIC
172C/W
8-pin PSOP
58.6C/W
8-pin LLP
40C/W
Electrical Characteristics
T
J
= 25C, G = +2, V
S
=
2.5 to
6V, R
f
= R
IN
= 470
, R
L
= 100
; Unless otherwise specified.
Symbol
Parameter
Conditions
Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)
Units
Dynamic Performance
-3dB Bandwidth
130
MHz
0.1dB Bandwidth
V
S
=
6V
22
MHz
Slew Rate
V
S
=
6V, 4V Step, 10-90%
170
V/s
Rise and Fall Time
V
S
= 6V, 4V Step, 10-90%
18.5
ns
Distortion and Noise Response
2
nd
Harmonic Distortion
V
O
= 8.4V
PP
, f = 100KHz, R
L
= 25
-95
dBc
V
O
= 8.4V
PP
, f = 1MHz, R
L
= 100
-92
dBc
3
rd
Harmonic Distortion
V
O
= 8.4V
PP
, f = 100KHz, R
L
= 25
-93
dBc
V
O
= 2V
PP
, f = 1MHz, R
L
= 100
-95
dBc
Input Noise Voltage
f = 100KHz
4.5
nV
Input Noise Current
f = 100KHz
1.7
pA/
Input Characteristics
V
OS
Input Offset Voltage
T
J
= -40C to 150C
-5.5
-0.2
5.5
mV
-4
-0.2
4
I
B
Input Bias Current
T
J
= -40C to 150C
8
14
A
I
OS
Input Offset Current
T
J
= -40C to 150C
-2.1
0
2.1
A
CMVR
Common Voltage Range
V
S
=
6V
-6.0
4.5
V
CMRR
Common-Mode Rejection Ratio
V
S
=
6V, T
J
= -40C to 150C
150
9.5
V/V
Transfer Characteristics
A
VOL
Voltage Gain
R
L
= 1k, T
J
= -40C to 150C
1.0
2.5
V/mV
R
L
= 25
, T
J
= -40C to 150C
0.67
1.7
V/mV
Output Swing
R
L
= 25
, V
S
=
6V
-4.5
4.8
4.5
V
R
L
= 25
, T
J
= -40C to 150C,
V
S
=
6V
-4.4
4.8
4.4
Output Swing
R
L
= 1k, V
S
=
6V
-4.8
4.8
4.8
V
R
L
= 1k, T
J
= -40C to 150C,
V
S
=
6V
-4.7
4.8
4.7
I
SC
Output Current (Note 3)
V
O
= 0, V
S
=
6V
400
788
mA
V
O
= 0, V
S
=
6V,
T
J
= -40C to 150C
260
600
mA
Power Supply
LMH6672
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2
Electrical Characteristics
(Continued)
T
J
= 25C, G = +2, V
S
=
2.5 to
6V, R
f
= R
IN
= 470
, R
L
= 100
; Unless otherwise specified.
Symbol
Parameter
Conditions
Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)
Units
I
S
Supply Current/Amp
V
S
=
6V
8
mA
V
S
=
6V, T
J
= -40C to 150C
6.2
9
PSRR
Power Supply Rejection Ratio
V
S
=
2.5V to
6V,
T
J
= -40C to 150C
72
78
dB
2.5V Electrical Characteristics
T
J
= 25C, G = +2, V
S
=
2.5 to
6V, R
f
= R
IN
= 470
, R
L
= 100
; Unless otherwise specified.
Symbol
Parameter
Conditions
Min
(Note 6)
Typ
(Note 5)
Max
(Note 6)
Units
Dynamic Performance
-3dB Bandwidth
125
MHz
0.1dB Bandwidth
32
MHz
Slew Rate
0.4V Step, 10-90%
115
V/s
Rise and Fall Time
0.4V Step, 10-90%
2.75
ns
Distortion and Noise Response
2
nd
Harmonic Distortion
V
O
= 2V
PP
, f = 100KHz, R
L
= 25
-85
dBc
V
O
= 2V
PP
, f = 1MHz, R
L
= 100
-87
dBc
3
rd
Harmonic Distortion
V
O
= 2V
PP
, f = 100KHz, R
L
= 25
-90
dBc
V
O
= 2V
PP
, f = 1MHz, R
L
= 100
-88
dBc
Input Characteristics
V
OS
Input Offset Voltage
T
J
= -40C to 150C
-5.5
5.5
mV
-4.0
1.1
4.0
I
B
Input Bias Current
T
J
= -40C to 150C
8.0
14
A
CMVR
Common-Mode Voltage Range
-2.5
1.0
V
CMRR
Common-Mode Rejection Ratio
T
J
= -40C to 150C
150
57
V/V
Transfer Characteristics
A
VOL
Voltage Gain
R
L
= 25
, T
J
= -40C to 150C
0.67
1.54
V/mV
R
L
= 1k, T
J
= -40C to 150C
1.0
2.0
Output Characteristics
V
O
Output Voltage Swing
R
L
= 25
1.20
1.45
V
R
L
= 25
, T
J
= -40C to 150C
1.10
1.35
R
L
= 1k
1.30
1.60
R
L
= 1k, T
J
= -40C to 150C
1.25
1.50
Power Supply
I
S
Supply Current/Amp
8.0
mA
T
J
= -40C to 150C
5.6
9.0
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 and the test conditions, see the Electrical Characteristics.
Note 2: Human body model, 1.5k
in series with 100pF. Machine model, 200
in series with 100pF.
Note 3: Shorting the output to either supply or ground will exceed the absolute maximum T
J
and can result in failure.
Note 4: 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.
Note 5: Typical values represent the most likely parametric norm.
Note 6: All limits are guaranteed by testing, characterization or statistical analysis.
LMH6672
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3
Typical Performance Characteristics
At T
J
= 25C, R
F
= 470
gain = +2, R
L
= 100
. Unless oth-
erwise specified.
Output Swing R
L
= 25
, 1k
@
-40C, 25C, 85C
Positive Output Swing into 1k
20016635
20016645
Negative Output Swing into 1k
Positive Output Swing into 25
20016646
20016644
Negative Output Swing into 25
+V
OUT
vs. I
LOAD
20016647
20016640
LMH6672
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4
Typical Performance Characteristics
At T
J
= 25C, R
F
= 470
gain = +2, R
L
= 100
. Unless
otherwise specified. (Continued)
-V
OUT
vs. I
LOAD
+V
OUT
vs. I
LOAD
20016641
20016643
-V
OUT
vs. I
LOAD
Supply Current vs. Supply Voltage
20016642
20016632
Sourcing Current vs. Supply Voltage
Sinking Current vs. Supply Voltage
20016633
20016634
LMH6672
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5
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