LT1672/LT1673/LT1674
2µA Max, A
V
≥
5 Single, Dual
and Quad Over-The-Top Precision
Rail-to-Rail Input and Output Op Amps
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Gain of 5 Stable
Low Supply Current: 2
µ
A Max per Amplifier
Rail-to-Rail Input and Output
Low Offset Voltage: 375
µ
V Max
Over-The-Top
TM
Inputs Operate Above V
+
Gain Bandwidth Product: 12kHz
Wide Supply Range: 2.2V to 36V
Single Supply Input Range: – 0.3V to 36V
Low Input Bias Current: 250pA
Low Input Offset Current: 20pA
High A
VOL
: 100V/mV Minimum Driving 100kΩ Load
Output Sources and Sinks 500µA Load Current
Reverse Battery Protected to 18V
The LT
®
1672/LT1673/LT1674 are ultralow power
(I
S
≤
2µA) decompensated (A
V
≥
5) op amps with preci-
sion specifications. The extremely low supply current is
combined with excellent amplifier specifications: input
offset voltage is 375µV maximum with a typical drift of
only 0.4µV/°C, input offset current is 100pA maximum. A
minimum open-loop gain (A
VOL
) of 100V/mV ensures that
gain errors are small. The devices’ characteristics change
little over the supply range of 2.2V to
±15V.
Supply
rejection is 90dB and the common mode rejection ratio is
90dB. Operation is specified for 3V, 5V and
±15V
supplies.
Reverse battery protection (–18V min) and inputs that
operate above the positive supply make the LT1672/
LT1673/LT1674 easy to use in harsh environments.
The low bias currents and offset current of the amplifier
permit the use of megohm level source resistors without
introducing significant errors. Voltage noise at 4µV
P-P
is
remarkably low considering the low supply current. For
unity gain stable versions of these amplifiers, see the
LT1494/LT1495/LT1496.
The LT1672 is available in the 8-pin MSOP, PDIP and SO
packages. The LT1673 is available in plastic 8-pin PDIP
and SO-8 packages with the standard dual op amp pinout.
The LT1674 is available in 14-pin PDIP and SO packages.
APPLICATIO S
s
s
s
s
s
s
Battery- or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Micropower Filter
Photodiode Amplifier
High Impedance Circuits
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
TYPICAL APPLICATION
Single Supply, 60µW Precision Instrumentation Amplifier
5V
100k*
V
IN1
80
+
1/2 LT1673
1M
5V
1M
100k
110k
UNITS
–
–
1000pF
110k
1M
100k
1M
LT1672
V
OUT
+
1M
5V
0.0047µF
LT1389-2.5
1672/3/4 TA01
–
100k*
V
IN2
1/2 LT1673
+
A
V
= 100
BANDWIDTH = 1kHz
CMRR = 65dB AT 120Hz
*500V TRANSIENT PROTECTION
TOTAL SUPPLY CURRENT = 12µA
U
TC V
OS
Distribution
120 AMPLIFIERS
70 V
S
=
±2.5V
– 40°C to 85°C
60
50
40
30
20
10
0
–1.5
– 0.9
– 0.3
0.3
TC V
OS
(µV/°C)
0.9
1.5
1672/3/4 TA02
U
U
1
LT1672/LT1673/LT1674
ABSOLUTE
AXI U
RATI GS
Total Supply Voltage (V
+
to V
–
) .............................. 36V
Differential Input Voltage ......................................... 36V
Input Current ......................................................
±10mA
Output Short-Circuit Duration ....................... Continuous
Operating Temperature Range (Note 2) .. – 40°C to 85°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NC
–IN
+IN
V
–
1
2
3
4
8
7
6
5
NC
V
+
OUT
NC
ORDER PART
NUMBER
LT1672CMS8
LT1672IMS8
NC 1
–IN 2
+IN 3
V
–
4
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 250°C/ W
MS8 PART MARKING
LTFH
LTFJ
TOP VIEW
OUT A 1
–IN A 2
A
+IN A 3
V
–
4
N8 PACKAGE
8-LEAD PDIP
B
5
8
7
6
V
+
OUT B
–IN B
+IN B
ORDER PART
NUMBER
LT1673CN8
LT1673CS8
LT1673IN8
LT1673IS8
S8 PART MARKING
1673
1673I
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 150°C/ W (N8)
T
JMAX
= 150°C,
θ
JA
= 190°C/ W (S8)
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
T
A
= 25°C, V
S
= 5V, 0V; V
S
= 3V, 0V; V
CM
= V
O
= half supply, unless otherwise noted.
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
CONDITIONS
V
S
= 5V
V
S
= 3V
V
S
= 5V, MS8 Package
V
S
= 3V, MS8 Package
(Note 5)
V
CM
= 10V (Note 6)
(Note 5)
0.1Hz to 10Hz
MIN
TYP
150
200
150
200
250
180
20
4
MAX
375
475
475
575
1000
360
100
UNITS
µV
µV
µV
µV
pA
nA
pA
µV
P-P
I
B
I
OS
Input Bias Current
Input Offset Current
Input Noise Voltage
2
U
U
W
W W
U
W
(Note 1)
Specified Temperature Range (Note 3) ... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Junction Temperature ........................................... 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
8
7
6
5
NC
V
+
OUT
NC
ORDER PART
NUMBER
LT1672CN8
LT1672CS8
LT1672IN8
LT1672IS8
S8 PART MARKING
1672
1672I
ORDER PART
NUMBER
LT1674CN
LT1674CS
LT1674IN
LT1674IS
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 130°C/ W (N8)
T
JMAX
= 150°C,
θ
JA
= 190°C/ W (S8)
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V
+
4
+IN B 5
–IN B 6
OUT B 7
N PACKAGE
14-LEAD PDIP
B
C
A
D
14 OUT D
13 –IN D
12 +IN D
11 V
–
10 +IN C
9
8
–IN C
OUT C
S PACKAGE
14-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 110°C/ W (N)
T
JMAX
= 150°C,
θ
JA
= 150°C/ W (S)
LT1672/LT1673/LT1674
ELECTRICAL CHARACTERISTICS
T
A
= 25°C, V
S
= 5V, 0V; V
S
= 3V, 0V; V
CM
= V
O
= half supply, unless otherwise noted.
SYMBOL
e
n
i
n
A
VOL
PARAMETER
Input Noise Voltage Density
Input Noise Current Density
Large-Signal Voltage Gain
Input Voltage Range
Common Mode Rejection Ratio
CONDITIONS
f = 100Hz
f = 100Hz
V
S
= 5V, V
O
= 0.25V to 4.5V, R
L
= 100k
V
S
= 3V, V
O
= 0.25V to 2.5V, R
L
= 100k
V
CM
= 0V to 4V, V
S
= 5V
V
CM
= 0V to 10V, V
S
= 5V
V
S
= 2.2V to 12V, V
CM
= V
O
= 0.5V
MIN
TYP
185
10
500
250
106
95
99
2.1
50
210
V
+
– 0.035
V
+
– 0.160
1.3
1.5
5
12
MAX
UNITS
nV/√Hz
fA/√Hz
V/mV
V/mV
V
dB
dB
dB
V
mV
mV
V
V
mA
µA
V
V/ms
kHz
CMRR
PSRR
V
OL
V
OH
I
SC
I
S
SR
GBW
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Output Voltage Swing LOW
No Load
I
SINK
= 100µA
Output Voltage Swing HIGH
No Load
I
SOURCE
= 100µA
Short-Circuit Current
(Note 5)
Supply Current per Amplifier
(Note 6)
Reverse Supply Voltage
I
S
= 10µA per Amplifier
Slew Rate
A
V
= – 5, V
S
=
±10V
Gain Bandwidth Product
f = 100Hz
100
50
0
90
74
90
36
2.2
100
410
V
+
– 0.07
V
+
– 0.32
0.7
–18
1.6
2
The
q
denotes the specifications which apply over the temperature range of 0°C
≤
T
A
≤
70°C. V
S
= 5V, 0V; V
S
= 3V, 0V;
V
CM
= V
O
= half supply, unless otherwise noted. (Note 3)
SYMBOL PARAMETER
Input Offset Voltage
V
OS
CONDITIONS
V
S
= 5V
V
S
= 3V
V
S
= 5V, MS8 Package
V
S
= 3V, MS8 Package
(Note 4)
(Note 5)
V
CM
= 10V (Note 6)
(Note 5)
V
S
= 5V, V
O
= 0.25V to 4.5V, R
L
= 100k
V
S
= 3V, V
O
= 0.25V to 2.5V, R
L
= 100k
V
CM
= 0.2V to 4V, V
S
= 5V
V
CM
= 0.2V to 10V, V
S
= 5V
V
S
= 2.4V to 12V, V
CM
= V
O
= 0.5V
No Load
I
SINK
= 100µA
No Load
I
SOURCE
= 100µA
(Note 5)
(Note 6)
MIN
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
V
OS
TC
I
B
I
OS
A
VOL
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
Large-Signal Voltage Gain
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Output Voltage Swing LOW
Output Voltage Swing HIGH
Short-Circuit Current
Supply Current per Amplifier
CMRR
PSRR
V
OL
V
OH
I
SC
I
S
75
40
0.2
89
64
89
TYP
175
225
175
225
0.4
250
240
20
280
150
106
85
99
2.3
55
225
+
– 0.04
V
V
+
– 0.18
1.1
1.9
MAX
425
525
525
625
2
1200
500
120
36
2.4
110
450
V
+
– 0.08
V
+
– 0.36
0.6
2.8
UNITS
µV
µV
µV
µV
µV/°C
pA
nA
pA
V/mV
V/mV
V
dB
dB
dB
V
mV
mV
V
V
mA
µA
3
LT1672/LT1673/LT1674
ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the temperature range of – 40°C
≤
T
A
≤
85°C. V
S
= 5V, 0V; V
S
= 3V, 0V;
V
CM
= V
O
= half supply, unless otherwise noted. (Note 3)
SYMBOL PARAMETER
V
OS
Input Offset Voltage
CONDITIONS
V
S
= 5V
V
S
= 3V
V
S
= 5V, MS8 Package
V
S
= 3V, MS8 Package
(Note 4)
(Note 5)
V
CM
= 10V (Note 6)
(Note 5)
V
S
= 5V, V
O
= 0.25V to 4.5V, R
L
= 100k
V
S
= 3V, V
O
= 0.25V to 2.5V, R
L
= 100k
V
CM
= 0.2V to 4V, V
S
= 5V
V
CM
= 0.2V to 10V, V
S
= 5V
V
S
= 2.7V to 12V, V
CM
= V
O
= 0.5V
No Load
I
SINK
= 100µA
No Load
I
SOURCE
= 100µA
(Note 5)
(Note 6)
MIN
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
V
OS
TC
I
B
I
OS
A
VOL
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
Large-Signal Voltage Gain
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Output Voltage Swing LOW
Output Voltage Swing HIGH
Short-Circuit Current
Supply Current per Amplifier
CMRR
PSRR
V
OL
V
OH
I
SC
I
S
55
30
0.2
88
62
88
TYP
200
250
200
250
0.4
250
275
20
215
115
106
75
99
2.6
60
245
V
+
– 0.05
V
+
– 0.19
0.9
2.1
MAX
475
575
575
675
2
1700
750
170
36
2.7
120
490
V
+
– 0.10
V
+
– 0.38
0.4
3.1
UNITS
µV
µV
µV
µV
µV/°C
pA
nA
pA
V/mV
V/mV
V
dB
dB
dB
V
mV
mV
mV
mV
mA
µA
T
A
= 25°C, V
S
=
±15V,
V
CM
= V
O
= 0V, unless otherwise noted.
SYMBOL PARAMETER
Input Offset Voltage
V
OS
I
B
I
OS
A
VOL
CMRR
PSRR
V
OL
V
OH
I
SC
I
S
Input Bias Current
Input Offset Current
Large-Signal Voltage Gain
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing LOW
Output Voltage Swing HIGH
Short-Circuit Current
Supply Current per Amplifier
CONDITIONS
MS8 Package
MIN
TYP
200
200
25
20
360
120
120
–14.85
–14.75
14.89
14.81
1.5
1.9
MAX
575
675
1000
100
21
UNITS
µV
µV
pA
pA
V/mV
V
dB
dB
V
V
V
V
mA
µA
V
O
=
±10V,
R
L
= 100k
V
CM
= – 15V to 14V
V
S
=
±5V
to
±15V
R
L
= 1M
R
L
= 100k
R
L
= 1M
R
L
= 100k
100
– 15
100
96
–14.70
–14.50
14.78
14.62
0.7
2.8
4
LT1672/LT1673/LT1674
ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the temperature range of 0°C
≤
T
A
≤
70°C, V
S
=
±15V,
V
CM
= V
O
= 0V,
unless otherwise noted. (Note 3)
SYMBOL PARAMETER
Input Offset Voltage
V
OS
I
B
I
OS
A
VOL
CMRR
PSRR
V
OL
V
OH
I
SC
I
S
Input Bias Current
Input Offset Current
Large-Signal Voltage Gain
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing LOW
Output Voltage Swing HIGH
Short-Circuit Current
Supply Current per Amplifier
CONDITIONS
MS8 Package
q
q
q
q
MIN
V
O
=
±10V,
R
L
= 100k
V
CM
= –14.8V to 14V
V
S
=
±5V
to
±15V
R
L
= 1M
R
L
= 100k
R
L
= 1M
R
L
= 100k
q
q
q
q
q
q
q
q
q
q
60
– 14.8
98
94
TYP
225
225
250
20
240
120
120
–14.84
–14.73
14.88
14.79
1.3
2.4
MAX
625
725
1200
120
21
–14.67
–14.46
14.76
14.58
0.6
3.5
UNITS
µV
µV
pA
pA
V/mV
V
dB
dB
V
V
V
mV
mA
µA
The
q
denotes the specifications which apply over the temperature range of –40°C
≤
T
A
≤
85°C, V
S
=
±15V,
V
CM
= V
O
= 0V,
unless otherwise noted. (Note 3)
SYMBOL PARAMETER
V
OS
Input Offset Voltage
I
B
I
OS
A
VOL
CMRR
PSRR
V
OL
V
OH
I
SC
I
S
Input Bias Current
Input Offset Current
Large-Signal Voltage Gain
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing LOW
Output Voltage Swing HIGH
Short-Circuit Current
Supply Current per Amplifier
CONDITIONS
MS8 Package
q
q
q
q
MIN
V
O
=
±10V,
R
L
= 100k
V
CM
= –14.8V to 14V
V
S
=
±5V
to
±15V
R
L
= 1M
R
L
= 100k
R
L
= 1M
R
L
= 100k
q
q
q
q
q
q
q
q
q
q
50
– 14.8
96
92
TYP
250
250
250
20
200
114
120
–14.83
–14.72
14.87
14.77
1.1
2.8
MAX
675
775
1700
170
21
–14.66
–14.44
14.74
14.54
0.4
4.2
UNITS
µV
µV
pA
pA
V/mV
V
dB
dB
V
V
V
V
mA
µA
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2:
The LT1672C/LT1673C/LT1674C and LT1672I/LT1673I/LT1674I
are guaranteed functional over the Operating Temperature Range of – 40°C
to 85°C.
Note 3:
The LT1672C/LT1673C/LT1674C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1672C/LT1673C/LT1674C are
designed, characterized and expected to meet specified performance from
– 40°C to 85°C but are not tested or QA sampled at these temperatures.
The LT1672I/LT1673I/LT1674I are guaranteed to meet specified
performance from – 40°C to 85°C.
Note 4:
This parameter is not 100% tested.
Note 5:
V
S
= 5V limit guaranteed by correlation to V
S
= 3V and V
S
=
±15V
tests.
Note 6:
V
S
= 3V limit guaranteed by correlation to V
S
= 5V and V
S
=
±15V
tests.
5
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