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LMH6642/LMH6643/LMH6644 Low Power, 130MHz, 75mA Rail-to-Rail Output Amplifiers
November 20, 2008
LMH6642/LMH6643/LMH6644
Low Power, 130MHz, 75mA Rail-to-Rail Output Amplifiers
General Description
The LMH664X family true single supply voltage feedback am-
plifiers offer high speed (130MHz), low distortion (−62dBc),
and exceptionally high output current (approximately 75mA)
at low cost and with reduced power consumption when com-
pared against existing devices with similar performance.
Input common mode voltage range extends to 0.5V below V
−
and 1V from V
+
. Output voltage range extends to within
40mV of either supply rail, allowing wide dynamic range es-
pecially desirable in low voltage applications. The output
stage is capable of approximately 75mA in order to drive
heavy loads. Fast output Slew Rate (130V/µs) ensures large
peak-to-peak output swings can be maintained even at higher
speeds, resulting in exceptional full power bandwidth of
40MHz with a 3V supply. These characteristics, along with
low cost, are ideal features for a multitude of industrial and
commercial applications.
Careful attention has been paid to ensure device stability un-
der all operating voltages and modes. The result is a very well
behaved frequency response characteristic (0.1dB gain flat-
ness up the 12MHz under 150Ω load and A
V
= +2) with
minimal peaking (typically 2dB maximum) for any gain setting
and under both heavy and light loads. This along with fast
settling time (68ns) and low distortion allows the device to
operate well in ADC buffer, and high frequency filter applica-
tions as well as other applications.
This device family offers professional quality video perfor-
mance with low DG (0.01%) and DP (0.01°) characteristics.
Differential Gain and Differential Phase characteristics are al-
so well maintained under heavy loads (150Ω) and throughout
the output voltage range. The LMH664X family is offered in
single (LMH6642), dual (LMH6643), and quad (LMH6644)
options. See ordering information for packages offered.
Features
(V
S
= ±5V, T
A
= 25°C, R
L
= 2kΩ, A
V
= +1. Typical values un-
less specified).
130MHz
■
−3dB BW (A
V
= +1)
Supply voltage range
2.7V to 12.8V
■
130V/µs
■
Slew rate (Note 8), (A
V
= −1)
2.7mA/amp
■
Supply current (no load)
+115mA/−145mA
■
Output short circuit current
±75mA
■
Linear output current
Input common mode volt.
0.5V beyond V
−
, 1V from V
+
■
40mV from rails
■
Output voltage swing
17nV/
■
Input voltage noise (100kHz)
0.9pA/
■
Input current noise (100kHz)
−62dBc
■
THD (5MHz, R
L
= 2kΩ, V
O
= 2V
PP
, A
V
= +2)
68ns
■
Settling time
Fully characterized for 3V, 5V, and ±5V
■
100ns
■
Overdrive recovery
■
Output short circuit protected (Note 11)
■
No output phase reversal with CMVR exceeded
Applications
■
■
■
■
■
Active filters
CD/DVD ROM
ADC buffer amp
Portable video
Current sense buffer
Closed Loop Gain vs. Frequency for Various Gain
Large Signal Frequency Response
20018535
20018547
© 2008 National Semiconductor Corporation
200185
www.national.com
LMH6642/LMH6643/LMH6644
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
V
IN
Differential
Output Short Circuit Duration
Supply Voltage (V
+
- V
−
)
Voltage at Input/Output pins
Input Current
Storage Temperature Range
Junction Temperature (Note 4)
2KV (Note 2)
200V (Note 9)
±2.5V
(Note 3), (Note 11)
13.5V
+
+0.8V, V
−
−0.8V
V
±10mA
−65°C to +150°C
+150°C
Soldering Information
Infrared or Convection Reflow(20 sec)
Wave Soldering Lead Temp.(10 sec)
235°C
260°C
Operating Ratings
(Note 1)
2.7V to 12.8V
−40°C to +85°C
265°C/W
190°C/W
235°C/W
145°C/W
155°C/W
Supply Voltage (V
+
– V
−
)
Junction Temperature Range (Note 4)
Package Thermal Resistance (Note 4)
(θ
JA
)
5-Pin SOT-23
8-Pin SOIC
8-Pin MSOP
14-Pin SOIC
14- Pin TSSOP
3V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for at T
J
= 25°C, V
+
= 3V, V
−
= 0V, V
CM
= V
O
= V
+
/2, V
ID
(input differential voltage)
as noted (where applicable) and R
L
= 2kΩ to V
+
/2.
Boldface
limits apply at the temperature extremes.
Symbol
BW
BW
0.1dB
PBW
e
n
i
n
THD
DG
−3dB BW
0.1dB Gain Flatness
Full Power Bandwidth
Input-Referred Voltage Noise
Input-Referred Current Noise
Total Harmonic Distortion
Differential Gain
Parameter
Conditions
A
V
= +1, V
OUT
= 200mV
PP
A
V
= +2, −1, V
OUT
= 200mV
PP
A
V
= +2, R
L
= 150Ω
to V+/2,
R
L
= 402Ω,
V
OUT
= 200mV
PP
A
V
= +1, −1dB, V
OUT
= 1V
PP
f = 100kHz
f = 1kHz
f = 100kHz
f = 1kHz
f = 5MHz, V
O
= 2V
PP
, A
V
= −1,
R
L
= 100Ω
to V
+
/2
V
CM
= 1V, NTSC, A
V
= +2
R
L
=150Ω
to V
+
/2
R
L
=1kΩ to V
+
/2
DP
Differential Phase
V
CM
= 1V, NTSC, A
V
= +2
R
L
=150Ω
to V
+
/2
R
L
=1kΩ to V
+
/2
CT Rej.
T
S
SR
V
OS
TC V
OS
I
B
I
OS
R
IN
C
IN
Cross-Talk Rejection
Settling Time
Slew Rate (Note 8)
Input Offset Voltage
Input Offset Average Drift
Input Bias Current
Input Offset Current
Common Mode Input Resistance
Common Mode Input
Capacitance
(Note 12)
(Note 7)
f = 5MHz, Receiver:
R
f
= R
g
= 510Ω,
A
V
= +2
V
O
= 2V
PP
, ±0.1%, 8pF Load,
V
S
= 5V
A
V
= −1, V
I
= 2V
PP
90
0.03
47
68
120
±1
±5
−1.50
20
3
2
−2.60
−3.25
800
1000
±5
±7
dB
ns
V/µs
mV
µV/°C
µA
nA
MΩ
pF
0.03
0.05
deg
0.17
%
40
17
48
0.90
3.3
−48
MHz
nV/
pA/
dBc
Min
(Note 6)
80
Typ
(Note 5)
115
46
19
Max
(Note 6)
Units
MHz
MHz
www.national.com
2
LMH6642/LMH6643/LMH6644
Symbol
CMVR
Parameter
Input Common-Mode Voltage
Range
Conditions
CMRR
≥
50dB
Min
(Note 6)
Typ
(Note 5)
−0.5
Max
(Note 6)
−0.2
−0.1
Units
1.8
1.6
CMRR
A
VOL
Common Mode Rejection Ratio
Large Signal Voltage Gain
V
CM
Stepped from 0V to 1.5V
V
O
= 0.5V to 2.5V
R
L
= 2kΩ to V
+
/2
V
O
= 0.5V to 2.5V
R
L
= 150Ω
to V
+
/2
V
O
Output Swing
High
Output Swing
Low
I
SC
Output Short Circuit Current
R
L
= 2kΩ to V
+
/2, V
ID
= 200mV
R
L
= 150Ω
to V
+
/2, V
ID
= 200mV
R
L
= 2kΩ to V
+
/2, V
ID
= −200mV
R
L
= 150Ω
to V
+
/2, V
ID
= −200mV
Sourcing to V
+
/2
V
ID
= 200mV (Note 10)
Sinking to V
+
/2
V
ID
= −200mV (Note 10)
I
OUT
+PSRR
I
S
Output Current
V
OUT
= 0.5V from either supply
75
Positive Power Supply Rejection V
+
= 3.0V to 3.5V, V
CM
= 1.5V
Ratio
Supply Current (per channel)
No Load
50
35
55
40
72
80
75
74
70
2.90
2.80
2.0
95
96
82
2.98
2.93
25
75
95
110
±65
85
2.70
4.00
4.50
75
150
V
dB
dB
V
mV
mA
mA
dB
mA
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, V
ID
(input differential voltage)
as noted (where applicable) and R
L
= 2kΩ to V
+
/2.
Boldface
limits apply at the temperature extremes.
Symbol
BW
BW
0.1dB
PBW
e
n
i
n
THD
DG
Parameter
−3dB BW
0.1dB Gain Flatness
Full Power Bandwidth
Input-Referred Voltage Noise
Input-Referred Current Noise
Total Harmonic Distortion
Differential Gain
Conditions
A
V
= +1, V
OUT
= 200mV
PP
A
V
= +2, −1, V
OUT
= 200mV
PP
A
V
= +2, R
L
= 150Ω
to V+/2,
R
f
= 402Ω,
V
OUT
= 200mV
PP
A
V
= +1, −1dB, V
OUT
= 2V
PP
f = 100kHz
f = 1kHz
f = 100kHz
f = 1kHz
f = 5MHz, V
O
= 2V
PP
, A
V
= +2
NTSC, A
V
= +2
R
L
=150Ω
to V
+
/2
R
L
= 1kΩ to V
+
/2
DP
Differential Phase
NTSC, A
V
= +2
R
L
= 150Ω
to V
+
/2
R
L
= 1kΩ to V
+
/2
CT Rej.
T
S
SR
Cross-Talk Rejection
Settling Time
Slew Rate (Note 8)
f = 5MHz, Receiver:
R
f
= R
g
= 510Ω,
A
V
= +2
V
O
= 2V
PP
, ±0.1%, 8pF Load
A
V
= −1, V
I
= 2V
PP
95
0.01
47
68
125
dB
ns
V/µs
0.05
0.05
deg
22
17
48
0.90
3.3
−60
0.16
%
MHz
nV/
pA/
dBc
Min
(Note 6)
90
Typ
(Note 5)
120
46
15
Max
(Note 6)
Units
MHz
MHz
3
www.national.com
LMH6642/LMH6643/LMH6644
Symbol
V
OS
TC V
OS
I
B
I
OS
R
IN
C
IN
CMVR
Parameter
Input Offset Voltage
Input Offset Average Drift
Input Bias Current
Input Offset Current
Common Mode Input Resistance
Common Mode Input
Capacitance
Input Common-Mode Voltage
Range
Conditions
Min
(Note 6)
Typ
(Note 5)
±1
Max
(Note 6)
±5
±7
−2.60
−3.25
800
1000
Units
mV
µV/°C
µA
nA
MΩ
pF
(Note 12)
(Note 7)
±5
−1.70
20
3
2
CMRR
≥
50dB
3.8
3.6
−0.5
4.0
95
98
82
4.98
4.90
25
100
55
40
70
55
79
115
140
±70
90
2.70
−0.2
−0.1
V
CMRR
A
VOL
Common Mode Rejection Ratio
Large Signal Voltage Gain
V
CM
Stepped from 0V to 3.5V
V
O
= 0.5V to 4.50V
R
L
= 2kΩ to V
+
/2
V
O
= 0.5V to 4.25V
R
L
= 150Ω
to V
+
/2
72
86
82
76
72
4.90
4.65
dB
dB
V
O
Output Swing
High
Output Swing
Low
R
L
= 2kΩ to V
+
/2, V
ID
= 200mV
R
L
= 150Ω
to V
+
/2, V
ID
= 200mV
R
L
= 2kΩ to V
+
/2, V
ID
= −200mV
R
L
= 150Ω
to V
+
/2, V
ID
= −200mV
Sourcing to V
+
/2
V
ID
= 200mV (Note 10)
Sinking to V
+
/2
V
ID
= −200mV (Note 10)
V
100
150
mV
I
SC
Output Short Circuit Current
mA
I
OUT
+PSRR
I
S
Output Current
V
O
= 0.5V from either supply
mA
dB
4.25
5.00
Positive Power Supply Rejection V
+
= 4.0V to 6V
Ratio
Supply Current (per channel)
No Load
mA
±5V Electrical Characteristics
Unless otherwise specified, all limits guaranteed for at T
J
= 25°C, V
+
= 5V, V
−
= −5V, V
CM
= V
O
= 0V, V
ID
(input differential voltage)
as noted (where applicable) and R
L
= 2kΩ to ground.
Boldface
limits apply at the temperature extremes.
Symbol
BW
BW
0.1dB
PBW
e
n
i
n
THD
Parameter
−3dB BW
0.1dB Gain Flatness
Full Power Bandwidth
Input-Referred Voltage Noise
Input-Referred Current Noise
Total Harmonic Distortion
Conditions
A
V
= +1, V
OUT
= 200mV
PP
A
V
= +2, −1, V
OUT
= 200mV
PP
A
V
= +2, R
L
= 150Ω
to V+/2,
R
f
= 806Ω,
V
OUT
= 200mV
PP
A
V
= +1, −1dB, V
OUT
= 2V
PP
f = 100kHz
f = 1kHz
f = 100kHz
f = 1kHz
f = 5MHz, V
O
= 2V
PP
, A
V
= +2
24
17
48
0.90
3.3
−62
MHz
nV/
pA/
dBc
Min
(Note 6)
95
Typ
(Note 5)
130
46
12
Max
(Note 6)
Units
MHz
MHz
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