Final Electrical Specifications
LT1677
Low Noise, Rail-to-Rail
Precision Op Amp
February 2000
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
Rail-to-Rail Input and Output
100% Tested Low Voltage Noise:
3.2nV/√Hz Typ at 1kHz
4.5nV/√Hz Max at 1kHz
Offset Voltage: 60µV Max
Low V
OS
Drift: 0.2µV/°C Typ
Low Input Bias Current: 20nA Max
Wide Supply Range: 3V to
±15V
High A
VOL
: 4V/µV Min, R
L
= 1k
High CMRR: 109dB Min
High PSRR: 108dB Min
Gain Bandwidth Product: 7.2MHz
Slew Rate: 2.5V/µs
Operating Temperature Range: – 40°C to 85°C
The LT
®
1677 features the lowest noise performance avail-
able for a rail-to-rail operational amplifier: 3.2nV/√Hz
wideband noise, 1/f corner frequency of 13Hz and 70nV
peak-to-peak 0.1Hz to 10Hz noise. Low noise is combined
with outstanding precision: 20µV offset voltage and
0.2µV/°C drift, 130dB common mode and power supply
rejection and 7.2MHz gain bandwidth product. The com-
mon mode range exceeds the power supply by 100mV.
The voltage gain of the LT1677 is extremely high, especially
with a single supply: 20 million driving a 1k load.
In the design, processing and testing of the device, particular
attention has been paid to the optimization of the entire
distribution of several key parameters. Consequently, the
specifications of even the lowest cost grade have been
spectacularly improved compared to competing rail-to-rail
amplifiers.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
s
s
s
Low Noise Signal Processing
Microvolt Accuracy Threshold Detection
Strain Gauge Amplifiers
Tape Head Preamplifiers
Direct Coupled Audio Gain Stages
Infrared Detectors
TYPICAL APPLICATIO
Precision High Side Current Sense
SOURCE
R
IN
1k
LOAD
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
+
3
–
R
LINE
0.1Ω
2
7
LT1677
4
6
ZETEX
BC856B
V
OUT
R
OUT
20k
1677 TA01
V
OUT
R
OUT
= R
LINE
R
I
LOAD
IN
= 2V/AMP
U
U
U
1
LT1677
ABSOLUTE
AXI U
RATI GS
(Note 1)
Operating Temperature Range
LT1677C (Note 4) ............................. – 40°C to 85°C
LT1677I ............................................. – 40°C to 85°C
Specified Temperature Range
LT1677C (Note 5) ............................. – 40°C to 85°C
LT1677I ............................................. – 40°C to 85°C
Supply Voltage ......................................................
±22V
Input Voltages (Note 2) ............ 0.3V Beyond Either Rail
Differential Input Current (Note 2) .....................
±
25mA
Output Short-Circuit Duration (Note 3) ............ Indefinite
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
V
OS
TRIM 1
–IN 2
+IN 3
V
–
4
N8 PACKAGE
8-LEAD PDIP
T
JMAX
= 150°C,
θ
JA
= 130°C/ W
V
OS
8 TRIM
ORDER PART
NUMBER
LT1677CN8
LT1677IN8
–
+
7
6
5
V
+
OUT
NC
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
T
A
= 25°C, V
S
=
±15V,
V
CM
= V
O
= 0V unless otherwise noted.
MIN
TYP
20
150
1.5
0.3
±2
0.16
– 0.4
3
5
20
70
33
100
5.2
25
7
3.2
17
5.3
4.5
±20
0.4
15
25
200
MAX
60
400
5
UNITS
µV
µV
mV
µV/Mo
nA
µA
µA
nA
nA
nA
nV
P-P
nV
P-P
nV
P-P
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
CONDITIONS (Note 6)
V
CM
= 14V to 15.1V
V
CM
= –13.3V to –15.1V
∆V
OS
∆Time
I
B
Long Term Input Voltage Stability
Input Bias Current
V
CM
= 14V to 15.1V
V
CM
= –13.3V to –15.1V
– 1.5
I
OS
Input Offset Current
V
CM
= 14V to 15.1V
V
CM
= –13.3V to –15.1V
e
n
Input Noise Voltage
0.1Hz to 10Hz (Note 7)
V
CM
= 15V
V
CM
= –15V
V
CM
= 0V, f
O
= 10Hz
V
CM
= 15V, f
O
= 10Hz
V
CM
= –15V, f
O
= 10Hz
V
CM
= 0V, f
O
= 1kHz (Note 8)
V
CM
= 15V, f
O
= 1kHz
V
CM
= –15V, f
O
= 1kHz
Input Noise Voltage Density
2
U
U
W
W W
U
W
TOP VIEW
V
OS
1
TRIM
–IN 2
+IN 3
V
–
4
8
V
OS
TRIM
V
+
OUT
NC
ORDER PART
NUMBER
LT1677CS8
LT1677IS8
S8 PART MARKING
1677
1677I
–
+
7
6
5
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 190°C/ W
LT1677
ELECTRICAL CHARACTERISTICS
SYMBOL
i
n
V
CM
R
IN
C
IN
CMRR
PSRR
A
VOL
PARAMETER
Input Noise Current Density
Input Voltage Range
Input Resistance
Input Capacitance
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Common Mode
V
S
=
±2.5V
V
CM
= –13.3V to 14.0V
V
CM
=
±15.1V
V
S
=
±1.7V
to
±18V
V
S
= 2.7V to 40V, V
CM
= V
O
= 1.7V
R
L
≥
10k, V
O
=
±14V
R
L
≥
1k, V
O
=
±13.5V
R
L
≥
600Ω, V
O
=
±10V
V
CC
= 5V or 3V, V
EE
= 0V, V
CM
= 1.7V,
R
L
to GND, V
OUT
= 0.5V to:
R
L
≥
10k, V
CC
– 0.5V
R
L
≥
1k, V
CC
– 0.7V
V
OL
Output Voltage Swing Low
Above V
EE
I
SINK
= 0.1mA
I
SINK
= 2.5mA
I
SINK
= 10mA
Below V
CC
I
SOURCE
= 0.1mA
I
SOURCE
= 2.5mA
I
SOURCE
= 10mA
25
R
L
≥
10k (Note 9)
f
O
= 100kHz
R
L
= 2k, A
V
= 1, f
O
= 1kHz, V
O
= 10V
P-P
10V Step 0.1%, A
V
= +1
10V Step 0.01%, A
V
= +1
I
OUT
= 0
A
V
= 100, f = 10kHz
1.7
4.5
109
74
106
108
7
4
0.4
T
A
= 25°C, V
S
=
±15V,
V
CM
= V
O
= 0V unless otherwise noted.
MIN
TYP
1.2
0.3
±15.1
±15.2
2
3.8
4.2
130
95
130
125
25
20
0.7
MAX
UNITS
pA/√Hz
pA/√Hz
V
GΩ
pF
pF
dB
dB
dB
dB
V/µV
V/µV
V/µV
CONDITIONS (Note 6)
f
O
= 10Hz
f
O
= 1kHz
2
1.5
10
4
80
110
300
110
190
500
35
2.5
7.2
0.0006
5
6
80
1
2.75
3.5
170
250
500
170
300
700
V/µV
V/µV
mV
mV
mV
mV
mV
mV
mA
V/µs
MHz
%
µs
µs
Ω
Ω
mA
V
OH
Output Voltage Swing High
I
SC
SR
GBW
THD
t
S
R
O
I
S
Output Short-Circuit Current (Note 3)
Slew Rate
Gain Bandwidth Product
Total Harmonic Distortion
Settling Time
Open-Loop Output Resistance
Closed-Loop Output Resistance
Supply Current
3
LT1677
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.
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
V
CM
= 14.0V to 14.8V
V
CM
= –13.3V to –15V
∆V
OS
∆Temp
I
B
Average Input Offset Drift
Input Bias Current
V
CM
= 14.0V to 14.8V
V
CM
= –13.3V to –15V
I
OS
Input Offset Current
V
CM
= 14.0V to 14.8V
V
CM
= –13.3V to –15V
V
CM
CMRR
PSRR
A
VOL
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
CM
= –13.3V to 14.0V
V
CM
= –15V to 14.8V
V
S
=
±1.7V
to
±18V
V
S
= 2.8V to 40V, V
CM
= V
O
= 1.7V
R
L
≥
10k, V
O
=
±14V
R
L
≥
1k, V
O
=
±13.5V
R
L
≥
600Ω, V
O
=
±10V
V
CC
= 5V or 3V, V
EE
= 0V, V
CM
= 1.7V,
V
OUT
= 0.4V to:
R
L
≥
10k, V
CC
– 0.5V
R
L
≥
1k, V
CC
– 0.7V
V
OL
Output Voltage Swing Low
Above V
EE
I
SINK
= 0.1mA
I
SINK
= 2.5mA
I
SINK
= 10mA
Below V
CC
I
SOURCE
= 0.1mA
I
SOURCE
= 2.5mA
I
SOURCE
= 10mA
R
L
≥
10k (Note 9)
f
O
= 100kHz
SO-8
N8 (Note 10)
CONDITIONS (Note 6)
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
MIN
TYP
30
180
1.8
0.40
0.20
±3
0.19
– 0.43
2
90
90
MAX
120
550
6
2
0.5
±35
0.6
20
220
350
14.8
UNITS
µV
µV
mV
µV/°C
µV/°C
nA
µA
µA
nA
nA
nA
V
dB
dB
dB
dB
V/µV
V/µV
V/µV
–2
–15
106
73
104
106
4
2
0.3
126
93
127
122
20
10
0.5
q
q
q
q
q
q
q
q
q
q
q
q
3
0.5
8
4
85
160
400
140
230
580
200
320
600
200
350
800
V/µV
V/µV
mV
mV
mV
mV
mV
mV
mA
V/µs
MHz
3.9
mA
V
OH
Output Voltage Swing High
I
SC
SR
GBW
I
S
Output Short-Circiut Current (Note 3)
Slew Rate
Gain Bandwidth Product
Supply Current
20
1.5
27
2.3
6.2
3.0
4
LT1677
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 5)
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
V
CM
= 14.0V to 14.7V
V
CM
= –13.3V to –15V
∆V
OS
∆Temp
I
B
Average Input Offset Drift
Input Bias Current
V
CM
= 14.0V to 14.7V
V
CM
= –13.3V to –15V
I
OS
Input Offset Current
V
CM
= 14.0V to 14.7V
V
CM
= –13.3V to –15V
V
CM
CMRR
PSRR
A
VOL
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V
CM
= –13.3V to 14.0V
V
CM
= –15V to 14.7V
V
S
=
±1.7V
to
±18V
V
S
= 3.1V to 40V, V
CM
= V
O
= 1.7V
R
L
≥
10k, V
O
=
±14V
R
L
≥
1k, V
O
=
±13.5V
R
L
≥
600Ω, V
O
=
±10V
V
CC
= 5V or 3V, V
EE
= 0V, V
CM
= 1.7V,
V
OUT
= 0.5V to:
R
L
≥
10k, V
CC
– 0.5V
R
L
≥
1k, V
CC
– 0.7V
V
OL
Output Voltage Swing Low
Above V
EE
I
SINK
= 0.1mA
I
SINK
= 2.5mA
I
SINK
= 10mA
Below V
CC
I
SOURCE
= 0.1mA
I
SOURCE
= 2.5mA
I
SOURCE
= 10mA
R
L
≥
10k (Note 9)
f
O
= 100kHz
SO-8
N8 (Note 10)
CONDITIONS (Note 6)
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
MIN
TYP
45
200
2
0.40
0.20
±7
0.25
– 0.45
6
100
100
MAX
180
650
6.5
2.0
0.5
±50
0.75
40
250
400
14.7
UNITS
µV
µV
mV
µV/°C
µV/°C
nA
µA
µA
nA
nA
nA
V
dB
dB
dB
dB
V/µV
V/µV
V/µV
– 2.3
–15
105
72
103
105
3
1.5
0.2
124
91
125
120
17
8
0.35
q
q
q
q
q
q
q
q
q
q
q
q
2
0.2
15
2
90
175
450
150
250
600
230
350
650
250
375
850
V/µV
V/µV
mV
mV
mV
mV
mV
mV
mA
V/µs
MHz
4.0
mA
V
OH
Output Voltage Swing High
I
SC
SR
GBW
I
S
Output Short-Circuit Current (Note 3)
Slew Rate
Gain Bandwidth Product
Supply Current
18
1.2
25
2.0
5.8
3.1
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2:
The inputs are protected by back-to-back diodes. Current limiting
resistors are not used in order to achieve low noise. If differential input
voltage exceeds
±1.4V,
the input current should be limited to 25mA. If the
common mode range exceeds either rail, the input current should be
limited to 10mA.
Note 3:
A heat sink may be required to keep the junction temperature
below absolute maximum.
Note 4:
The LT1677C and LTC1677I are guaranteed functional over the
Operating Temperature Range of – 40°C to 85°C.
Note 5:
The LT1677C is guaranteed to meet specified performance from
0°C to 70°C. The LT1677C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LT1677I is guaranteed to meet the
extended temperature limits.
Note 6:
Typical parameters are defined as the 60% yield of parameter
distributions of individual amplifier; i.e., out of 100 LT1677s, typically 60
op amps will be better than the indicated specification.
Note 7:
See the test circuit and frequency response curve for 0.1Hz to
10Hz tester in the Applications Information section of the LT1677 data
sheet.
Note 8:
Noise is 100% tested.
Note 9:
Slew rate is measured in A
V
= – 1; input signal is
±7.5V,
output
measured at
±2.5V.
Note 10:
This parameter is not 100% tested.
5
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