LT1677IS8#PBF [Linear]
暂无描述;LT1677
Low Noise, Rail-to-Rail
Precision Op Amp
U
FEATURES
DESCRIPTIO
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 90nV
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.
■
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 VOS Drift: 0.2µV/°C Typ
■
Low Input Bias Current: 20nA Max
■
Wide Supply Range: 3V to ±18V
■
High AVOL: 7V/µV Min, RL = 10k
The voltage gain of the LT1677 is extremely high, 19 million
(typical) driving a 10k load.
■
High CMRR: 109dB Min
■
High PSRR: 108dB Min
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 have been spectacularly improved compared
to competing rail-to-rail amplifiers.
■
Gain Bandwidth Product: 7.2MHz
■
Slew Rate: 2.5V/µs
■
Operating Temperature Range: –40°C to 85°C
U
APPLICATIO S
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
■
Low Noise Signal Processing
■
Microvolt Accuracy Threshold Detection
■
Strain Gauge Amplifiers
Tape Head Preamplifiers
■
■
Direct Coupled Audio Gain Stages
■
Infrared Detectors
■
Battery-Powered Microphones
U
TYPICAL APPLICATIO
Distribution of Offset Voltage
25
T
= 25°C
= ±15V
A
S
3V Electret Microphone Amplifier
V
20
15
A
= –100
R3
V
1.5V
1M
C1
R1
10k
1.5V
7
R2
10k
0.68µF
TO PA
OR
PANASONIC
ELECTRET
CONDENSER
–
+
2
3
HEADPHONES
10
5
6
MICROPHONE
WM-61
www.panasonic.com/pic
(714) 373-7334
LT1677
4
23Hz
HIGHPASS
1677 TA01
–1.5V
0
0
–40 –30 –20 –10
10 20 30 40
INPUT OFFSET VOLTAGE (µV)
1677 TA02
1677fa
1
LT1677
W W U W
U W
PACKAGE/ORDER I FOR ATIO
TOP VIEW
U
ABSOLUTE AXI U RATI GS
(Note 1)
V
V
OS
TRIM
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
Operating Temperature Range
LT1677C (Note 4) ............................. –40°C to 85°C
LT1677I ............................................. –40°C to 85°C
Specified Temperature Range
OS
1
2
3
4
8
7
6
5
TRIM
–IN
–
+
+V
S
OUT
NC
+IN
–V
S
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 150°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S0-8)
S8 PART MARKING
ORDER PART NUMBER
LT1677CS8
LT1677IS8
LT1677CN8
LT1677IN8
1677
1677I
LT1677C (Note 5) ............................. –40°C to 85°C
LT1677I ............................................. –40°C to 85°C
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The
S
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. V = 3V, V = V = 1.7V; V = 5V, V = V = 2.5V unless otherwise noted.
A
CM
O
S
CM
O
SYMBOL
PARAMETER
CONDITIONS (Note 6)
MIN
TYP
MAX
UNITS
V
Input Offset Voltage (Note 11)
35
55
75
90
150
210
µV
µV
µV
OS
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V
V
V
= V + 0.1V
150
180
200
400
550
650
µV
µV
µV
CM
CM
CM
S
= V – 0.2V, 0°C ≤ T ≤ 70°C
●
●
S
A
= V – 0.3V, –40°C ≤ T ≤ 85°C
S
A
V
V
V
= –0.1V
1.5
1.8
2.0
5.0
6.0
6.5
mV
mV
mV
CM
CM
CM
= 0V, 0°C ≤ T ≤ 70°C
●
●
A
= 0V, –40°C ≤ T ≤ 85°C
A
∆V
Average Input Offset Drift (Note 10)
Long Term Input Voltage Stability
Input Bias Current (Note 11)
SO-8
N8
●
●
0.40
0.20
2.0
1.5
µV/°C
µV/°C
OS
∆Temp
∆V
∆Time
0.3
µV/Mo
OS
I
±2
±3
±7
± 20
± 35
± 50
nA
nA
nA
B
0°C ≤ T ≤ 70°C
–40°C ≤ T ≤ 85°C
●
●
A
A
V
V
V
= V + 0.1V
0.19
0.19
0.25
0.40
0.60
0.75
µA
µA
µA
CM
CM
CM
S
= V – 0.2V, 0°C ≤ T ≤ 70°C
●
●
S
A
= V – 0.3V, –40°C ≤ T ≤ 85°C
S
A
V
V
V
= –0.1V
–1.2
–2.0
–2.3
–0.41
–0.45
–0.47
µA
µA
µA
CM
CM
CM
= 0V, 0°C ≤ T ≤ 70°C
●
●
A
= 0V, –40°C ≤ T ≤ 85°C
A
I
Input Offset Current (Note 11)
4
5
8
15
20
40
nA
nA
nA
OS
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V
V
V
= V + 0.1V
6
10
15
30
40
65
nA
nA
nA
CM
CM
CM
S
= V – 0.2V, 0°C ≤ T ≤ 70°C
●
●
S
A
= V – 0.3V, –40°C ≤ T ≤ 85°C
S
A
V
V
V
= –0.1V
20
25
30
100
150
160
nA
nA
CM
CM
CM
= 0V, 0°C ≤ T ≤ 70°C
●
●
A
= 0V, –40°C ≤ T ≤ 85°C
nA
A
1677fa
2
LT1677
ELECTRICAL CHARACTERISTICS
otherwise noted.
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. V = 3V, V = V = 1.7V; V = 5V, V = V = 2.5V unless
A
S
CM
O
S
CM
O
SYMBOL PARAMETER
CONDITIONS (Note 6)
MIN
TYP
MAX
UNITS
e
Input Noise Voltage
0.1Hz to 10Hz (Note 7)
90
180
600
nV
P-P
nV
P-P
nV
P-P
n
V
V
= V
= 0V
CM
CM
S
Input Noise Voltage Density (Note 8)
f = 10Hz
5.2
7
25
nV/√Hz
nV/√Hz
nV/√Hz
O
V
V
= V , f = 10Hz
= 0V, f = 10Hz
CM
CM
S O
O
f = 1kHz
3.2
5.3
17
4.5
nV/√Hz
nV/√Hz
nV/√Hz
O
V
V
= V , f = 1kHz
= 0V, f = 1kHz
CM
CM
S O
O
i
Input Noise Current Density
Input Voltage Range
f = 10Hz
f = 1kHz
O
1.2
0.3
pA/√Hz
pA/√Hz
n
O
V
–0.1
0
0
V + 0.1V
V
V
V
CM
S
0°C ≤ T ≤ 70°C
●
●
V – 0.2V
A
S
–40°C ≤ T ≤ 85°C
V – 0.3V
S
A
R
IN
Input Resistance
Common Mode
2
GΩ
C
Input Capacitance
4.2
pF
IN
CMRR
Common Mode Rejection Ratio (Note 11)
V = 3V
S
V
V
= –0.1V to 3.1V
= 0V to 2.7V
55
53
68
67
dB
dB
CM
CM
●
V = 5V
S
V
V
= –0.1V to 5.1V
= 0V to 4.7V
60
58
73
72
dB
dB
CM
CM
●
●
PSRR
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V = 2.7V to 40V, V = V = 1.7V
108
105
125
120
dB
dB
S
CM
O
V = 3.1V to 40V, V = V = 1.7V
S
CM
O
A
V = 3V, R ≥ 10k, V = 2.5V to 0.7V
0.6
0.4
0.4
4
3
3
V/µV
V/µV
V/µV
VOL
S
L
O
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V = 3V, R ≥ 2k, V = 2.2V to 0.7V
0.5
0.4
0.4
1
0.9
0.8
V/µV
V/µV
V/µV
S
L
O
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V = 3V, R ≥ 600Ω, V = 2.2V to 0.7V
0.20
0.15
0.10
0.43
0.40
0.35
V/µV
V/µV
V/µV
S
L
O
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V = 5V, R ≥ 10k, V = 4.5V to 0.7V
0.8
0.7
0.7
5
4
4
V/µV
V/µV
V/µV
S
L
O
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V = 5V, R ≥ 2k, V = 4.2V to 0.7V
0.40
0.35
0.25
0.9
0.8
0.6
V/µV
V/µV
V/µV
S
L
O
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V = 5V, R ≥ 600Ω, V = 4.2V to 0.7V
0.35
0.30
0.20
0.67
0.60
0.45
V/µV
V/µV
V/µV
S
L
O
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
1677fa
3
LT1677
ELECTRICAL CHARACTERISTICS
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. V = 3V, V = V = 1.7V; V = 5V, V = V = 2.5V unless
A
S
CM
O
S
CM
O
otherwise noted.
SYMBOL PARAMETER
V
CONDITIONS (Note 6)
MIN
TYP
MAX
UNITS
Output Voltage Swing Low (Note 11)
Output Voltage Swing High (Note 11)
Output Short-Circuit Current (Note 3)
Above GND
OL
I
= 0.1mA
110
125
130
170
200
230
mV
mV
mV
SINK
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Above GND
I
= 2.5mA
170
195
205
250
320
350
mV
mV
mV
SINK
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Above GND
I
= 10mA
370
440
465
500
600
650
mV
mV
mV
SINK
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V
Below V
OH
S
I
= 0.1mA
75
85
93
170
200
250
mV
mV
mV
SOURCE
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Below V
S
I
= 2.5mA
170
195
205
300
350
375
mV
mV
mV
SOURCE
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Below V
S
I
= 10mA
450
510
525
700
800
850
mV
mV
mV
SOURCE
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
I
V = 3V
15
14
13
22
20
19
mA
mA
mA
SC
S
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V = 5V
20
18
17
29
27
25
mA
mA
mA
S
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
SR
Slew Rate (Note 13)
A = –1
1.7
1.5
1.2
2.5
2.3
2.0
V/µs
V/µs
V/µs
V
R ≥ 10k, 0°C ≤ T ≤ 70°C
●
●
L
A
R ≥ 10k, –40°C ≤ T ≤ 85°C
L
A
GBW
Gain Bandwidth Product (Note 11)
Settling Time
f = 100kHz
4.5
3.8
3.7
7.2
6.2
5.8
MHz
MHz
MHz
O
f = 100kHz, 0°C ≤ T ≤ 70°C
●
●
O
A
f = 100kHz, –40°C ≤ T ≤ 85°C
O
A
t
2V Step 0.1%, A = +1
2V Step 0.01%, A = +1
2.1
3.5
µs
µs
S
V
V
R
Open-Loop Output Resistance
Closed-Loop Output Resistance
I
= 0
OUT
V
80
1
Ω
Ω
O
A = 100, f = 10kHz
I
Supply Current (Note 12)
2.60
2.75
2.80
3.4
3.7
3.8
mA
mA
mA
S
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
1677fa
4
LT1677
ELECTRICAL CHARACTERISTICS
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. V = ±15V, V = V = 0V unless otherwise noted.
A
S
CM
O
SYMBOL
PARAMETER
CONDITIONS (Note 6)
MIN
TYP
MAX
UNITS
V
Input Offset Voltage
20
30
45
60
120
180
µV
µV
µV
OS
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V
V
V
= 15.1V
= 14.8V, 0°C ≤ T ≤ 70°C
= 14.7V, –40°C ≤ T ≤ 85°C
150
180
200
400
550
650
µV
µV
µV
CM
CM
CM
●
●
A
A
V
V
V
= –15.1V
= –15V, 0°C ≤ T ≤ 70°C
= –15V, –40°C ≤ T ≤ 85°C
1.5
1.8
2.0
5.0
6.0
6.5
mV
mV
mV
CM
CM
CM
●
●
A
A
∆V
∆Temp
∆V
∆Time
Average Input Offset Drift (Note 10)
Long Term Input Voltage Stability
Input Bias Current
SO-8
N8
●
●
0.40
0.20
2.0
1.5
µV/°C
µV/°C
OS
0.3
µV/Mo
OS
I
±2
±3
±7
± 20
± 35
± 50
nA
nA
nA
B
0°C ≤ T ≤ 70°C
–40°C ≤ T ≤ 85°C
●
●
A
A
V
V
V
= 15.1V
= 14.8V, 0°C ≤ T ≤ 70°C
= 14.7V, –40°C ≤ T ≤ 85°C
0.19
0.20
0.25
0.40
0.60
0.75
µA
µA
µA
CM
CM
CM
●
●
A
A
V
V
V
= –15.1V
= –15V, 0°C ≤ T ≤ 70°C
= –15V, –40°C ≤ T ≤ 85°C
–1.2
–2.0
–2.3
–0.42
–0.46
–0.48
µA
µA
µA
CM
CM
CM
●
●
A
A
I
Input Offset Current
3
5
8
15
20
40
nA
nA
nA
OS
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V
V
V
= 15.1V
= 14.8V, 0°C ≤ T ≤ 70°C
= 14.7V, –40°C ≤ T ≤ 85°C
5
8
12
25
35
60
nA
nA
nA
CM
CM
CM
●
●
A
A
V
V
V
= –15.1V
= –15V, 0°C ≤ T ≤ 70°C
= –15V, –40°C ≤ T ≤ 85°C
20
25
30
105
160
170
nA
nA
nA
CM
CM
CM
●
●
A
A
e
Input Noise Voltage
0.1Hz to 10Hz (Note 7)
90
180
600
nV
P-P
nV
P-P
nV
P-P
n
V
V
= 15V
= –15V
CM
CM
Input Noise Voltage Density
f = 10Hz
5.2
7
25
nV/√Hz
nV/√Hz
nV/√Hz
O
V
V
= 15V, f = 10Hz
= –15V, f = 10Hz
CM
CM
O
O
f = 1kHz
3.2
5.3
17
4.5
nV/√Hz
nV/√Hz
nV/√Hz
O
V
= 15V, f = 1kHz
= –15V, f = 1kHz
CM
CM
O
V
O
i
Input Noise Current Density
Input Voltage Range
f = 10Hz
f = 1kHz
O
1.2
0.3
pA/√Hz
pA/√Hz
n
O
V
–15.1
–15.0
–15.0
15.1
14.8
14.7
V
V
V
CM
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
R
Input Resistance
Input Capacitance
Common Mode
2
GΩ
IN
C
4.2
pF
IN
1677fa
5
LT1677
ELECTRICAL CHARACTERISTICS
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. V = ± 15V, V = V = 0V unless otherwise noted.
A
S
CM
O
SYMBOL
PARAMETER
CONDITIONS (Note 6)
MIN
TYP
MAX
UNITS
CMRR
Common Mode Rejection Ratio
V
= –13.3V to 14V
109
105
130
124
dB
dB
CM
●
●
●
●
V
V
= –15.1V to 15.1V
= –15V to 14.7V
74
72
95
91
dB
dB
CM
CM
PSRR
Power Supply Rejection Ratio
Large-Signal Voltage Gain
V = ±1.7V to ±18V
106
103
130
125
dB
dB
S
V = 2.7V to 40V
V = 3.1V to 40V
108
105
125
120
dB
dB
S
S
A
V
R ≥ 10k, V = ±14V
7
4
3
19
13
8
V/µV
V/µV
V/µV
VOL
L
O
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
R ≥ 2k, V = ±13.5V
0.50
0.30
0.15
0.75
0.67
0.24
V/µV
V/µV
V/µV
L
O
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
R ≥ 600Ω, V = ±10V
0.2
0.5
V/µV
L
O
Output Voltage Swing Low
Above –V
OL
S
I
= 0.1mA
A
110
125
130
170
200
230
mV
mV
mV
SINK
0°C ≤ T ≤ 70°C
–40°C ≤ T ≤ 85°C
●
●
A
Above –V
S
I
= 2.5mA
170
195
205
250
320
350
mV
mV
mV
SINK
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Above –V
S
I
= 10mA
370
440
450
500
600
650
mV
mV
mV
SINK
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
V
Output Voltage Swing High
Below +V
S
OH
I
= 0.1mA
110
130
140
170
200
250
mV
mV
mV
SOURCE
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Below +V
S
I
= 2.5mA
A
210
240
250
300
350
375
mV
mV
mV
SOURCE
0°C ≤ T ≤ 70°C
–40°C ≤ T ≤ 85°C
●
●
A
Below +V
S
I
= 10mA
A
520
590
620
700
800
850
mV
mV
mV
SOURCE
0°C ≤ T ≤ 70°C
●
●
–40°C ≤ T ≤ 85°C
A
I
Output Short-Circuit Current (Note 3)
Slew Rate
25
20
18
35
30
28
mA
mA
mA
SC
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
SR
R ≥ 10k (Note 9)
1.7
1.5
1.2
2.5
2.3
2.0
V/µs
V/µs
V/µs
L
R ≥ 10k (Note 9) 0°C ≤ T ≤ 70°C
●
●
L
A
R ≥ 10k (Note 9) –40°C ≤ T ≤ 85°C
L
A
GBW
Gain Bandwidth Product
f = 100kHz
4.5
3.8
3.7
7.2
6.2
5.8
MHz
MHz
MHz
O
f = 100kHz, 0°C ≤ T ≤ 70°C
●
●
O
A
f = 100kHz, –40°C ≤ T ≤ 85°C
O
A
1677fa
6
LT1677
ELECTRICAL CHARACTERISTICS
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. V = ± 15V, V = V = 0V unless otherwise noted.
A
S
CM
O
SYMBOL
PARAMETER
CONDITIONS (Note 6)
MIN
TYP
MAX
UNITS
THD
Total Harmonic Distortion
Settling Time
R = 2k, A = 1, f = 1kHz, V = 10V
P-P
0.0006
%
L
V
O
O
t
10V Step 0.1%, A = +1
5
6
µs
µs
S
V
10V Step 0.01%, A = +1
V
R
O
Open-Loop Output Resistance
Closed-Loop Output Resistance
I
= 0
OUT
V
80
1
Ω
Ω
A = 100, f = 10kHz
I
Supply Current
2.75
3.00
3.10
3.5
3.9
4.0
mA
mA
mA
S
0°C ≤ T ≤ 70°C
●
●
A
–40°C ≤ T ≤ 85°C
A
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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 LT1677I are guaranteed functional over the
Operating Temperature Range of –40°C to 85°C.
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 at ±15V supplies.
Note 9: Slew rate is measured in A = –1; input signal is ±7.5V, output
V
measured at ±2.5V.
Note 10: This parameter is not 100% tested. V = 3V and 5V limits are
S
guaranteed by correlation to V = ±15V test.
S
Note 11: V = 5V limits are guaranteed by correlation to V = 3V and
S
S
V = ±15V tests.
S
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
specified performance from –40°C to 85°C.
Note 12: V = 3V limits are guaranteed by correlation to V = 5V and
S
S
V = ±15V tests.
S
Note 13: Guaranteed by correlation to slew rate at V = ±15V and GBW at
S
V = 3V and V = ±15V tests.
S
S
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Voltage Noise vs Frequency
0.1Hz to 10Hz Voltage Noise
0.01Hz to 1Hz Voltage Noise
100
10
1
1/f CORNER 10Hz
< –14.5V
V
CM
1/f CORNER 8.5Hz
V
> 14.5V
V
CM
CM
–13.5V TO 14.5V
1/f CORNER 13Hz
V
S
A
= ±15V
= 25°C
T
0
20
40
60
80
100
0
2
4
6
8
10
0.1
1
10
FREQUENCY (Hz)
100
1000
TIME (SECONDS)
TIME (SECONDS)
1677 G01
1677 G03
1677 G04
1677fa
7
LT1677
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Input Bias Current
vs Temperature
Voltage Noise vs Temperature
Current Noise vs Frequency
10
7
6
5
4
3
2
10
9
8
7
6
5
4
3
2
1
0
V
T
= ±15V
= 25°C
V
= ±15V
S
V
V
= ±15V
CM
S
A
S
V
= 0V
CM
= 0V
10Hz
1kHz
V
< –13.5V
CM
1/f CORNER 180Hz
1
V
CM
–13.5V TO 14.5V
1/f CORNER 90Hz
1/f CORNER 60Hz
100
V
> 14.5V
CM
0.1
10
1000
10000
–50
0
25
50
75 100 125
–50
0
25
50
75 100 125
–25
–25
FREQUENCY (Hz)
TEMPERATURE (°C)
TEMPERATURE (°C)
1677 G07
1677 G08
1677 G05
Offset Voltage Shift
vs Common Mode
Input Bias Current
vs Temperature
Input Bias Current Over the
Common Mode Range
600
500
400
300
200
100
2.5
2.0
250
800
600
V
= ±15V
V
= ±15V
= 25°C
S
S
A
200
150
100
50
T
V
= –14V
CM
1.5
V
IS REFERRED
CM
OS
CURRENT OUT OF DUT
400
TO V = 0V
1.0
V
= –13.6V
V
= 15.15V
CM
CM
200
0.5
INPUT BIAS CURRENT
= 14.3V
0
0
0
V
CM
–0.5
–1.0
–1.5
–2.0
–2.5
–50
–100
–150
–200
–250
–200
–400
–600
–800
V
= –15.3V
CM
V
= 14.7V
CURRENT INTO DUT
CM
V
T
= ±1.5V TO ±15V
= 25°C
S
A
5 TYPICAL PARTS
+
–
–1.0
V
1.0 2.0 –0.8 –0.4
–
V
0.4
–50
0
25
50
75 100 125
–16 –12 –8 –4
0
4
8
12 16
–25
+
TEMPERATURE (°C)
COMMON MODE INPUT VOLTAGE (V)
V
– V (V)
V
– V (V)
CM
CM
1677 G10
1677 G06
1677 G09
Distribution of Input Offset
Voltage Drift (N8)
Distribution of Input Offset
Voltage Drift (SO-8)
Warm-Up Drift
30
25
20
15
10
5
10
8
50
45
40
35
30
25
20
15
10
5
V
T
= ±15V
V
T
= ±15V
V
T
= ±15V
= 25°C
S
A
S
A
S
A
= –40°C TO 85°C
= –40°C TO 85°C
201 PARTS (5 LOTS)
167 PARTS (4 LOTS)
SO PACKAGE
6
N PACKAGE
4
2
0
0
0
–0.8
0
0.4 0.8 1.2 1.6 2.0
–0.4
0.6
INPUT OFFSET VOLTAGE DRIFT (µV/°C)
1.0
1.4
0
1
2
3
4
5
–1.0 –0.6 –0.2 0.2
INPUT OFFSET VOLTAGE DRIFT (µV/°C)
TIME (MINUTES)
1677 G37
1677 G02
1677 G13
1677fa
8
LT1677
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Common Mode Range
vs Temperature
Long-Term Stability of Four
Representative Units
V
vs Temperature of
OS
Representative Units
140
120
100
80
5
4
2.5
2.0
250
200
150
100
50
V
V
= ±15V
V
S
= ±2.5V TO ±15V
S
= 0V
CM
SO-8
N8
3
1.5
125°C
2
1.0
25°C
60
–55°C
1
0.5
–55°C
40
0
0
0
20
–1
–2
–3
–4
–5
–0.5
–1.0
–1.5
–2.0
–2.5
–50
–100
–150
–200
–250
0
V
IS REFERRED 125°C
OS
–20
–40
–60
–80
TO V = 0V
CM
25°C
–
+
–55
–35 –15
5
25 45 65 85 105 125
–1.0
V
1.0 2.0 –0.8 –0.4
–
V
0.4
0
100 200 300 400 500 600 700 800 900
TIME (HOURS)
TEMPERATURE (°C)
+
V
– V (V)
V
– V (V)
CM S
CM
S
1677 G11
1677 G14
1677 G12
Common Mode Rejection Ratio
vs Frequency
Power Supply Rejection Ratio
vs Frequency
Supply Current vs Supply Voltage
4
3
2
1
160
160
140
120
100
V
T
= ±15V
V
T
CM
= ±15V
S
A
S
A
V
= 25°C
= 25°C
140
120
100
80
= 0V
T
= 125°C
= 25°C
A
T
A
NEGATIVE SUPPLY
80
60
POSITIVE SUPPLY
T
A
= –55°C
60
40
20
0
40
20
0
10
100
10k
1
100k 1M
1k
0
±5
±10
±15
±20
1k
10k
100k
1M
10M
FREQUENCY (Hz)
SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
1677 G16
1677 G17
1677 G15
Voltage Gain vs Supply Voltage
(Single Supply)
Voltage Gain vs Frequency
Overshoot vs Load Capacitance
100
10
180
140
100
60
60
50
40
30
20
10
0
T
R
V
= 25°C
V
T
= ±15V
= 25°C
V
T
= ±15V
A
L
S
S
TO GND
: V = V /2
= 25°C
A
A
R
= 10k TO 2k
CM
O
S
L
R
= 10k
= 2k
L
V
CM
= 0V
RISING
EDGE
V
CM
= V
V
= V
EE
CC
CM
R
L
1
FALLING
EDGE
20
0.1
–20
0
10
20
30
0.01
1
100
10k
1M
100M
10
100
CAPACITANCE (pF)
1000
SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
1677 G21
1677 G19
1677 G18
1677fa
9
LT1677
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Large-Signal Transient Response
Small-Signal Transient Response
PM, GBWP, SR vs Temperature
70
60
50
3
V
C
= ±15V
= 15pF
S
L
PHASE
50mV
0
10V
8
7
6
5
4
GBW
–10V
–50mV
SLEW
2
AVCL = –1
S = ±15V
5µs/DIV
AVCL = 1
VS = ±15V
0.5µs/DIV
V
CL = 15pF
1
–50
0
25
50
75 100 125
–25
TEMPERATURE (°C)
1677 G22
Settling Time vs Output Step
(Noninverting)
Settling Time vs Output Step
(Inverting)
Gain, Phase Shift vs Frequency
12
10
12
10
50
40
30
20
10
0
100
80
60
40
20
0
V
V
C
= ±15V
CM
= 10pF
0.01% OF
FULL SCALE
S
V
A
T
= ±15V
= 1
= 25°C
S
V
A
2k
5k
–
+
5k
–
= 0V
V
IN
V
L
OUT
L
V
OUT
2k
+
V
125°C
25°C
–55°C
IN
R
= 1k
8
6
8
6
0.01% OF
FULL SCALE
0.1% OF
FULL SCALE
0.01% OF
FULL SCALE
0.01% OF
FULL SCALE
GAIN
PHASE
0.1% OF
FULL SCALE
4
2
0
4
2
0
0.1% OF
FULL SCALE
0.1% OF
FULL SCALE
V
A
= ±15V
= –1
= 25°C
S
V
A
T
–10
–20
–10 –8 –6 –4 –2
0
2
4
6
8
10
–10 –8 –6 –4 –2
0
2
4
6
8
10
0.1
1
10
100
FREQUENCY (MHz)
OUTPUT STEP (V)
OUTPUT STEP (V)
1677 G25
1677 G26
1677 G34
Output Voltage Swing
vs Load Current
Gain, Phase Shift vs Frequency
Gain, Phase Shift vs Frequency
50
40
30
20
10
0
100
80
60
40
20
0
50
40
30
20
10
0
100
80
60
40
20
0
+V – 0
S
V
V
C
= ±15V
CM
= 10pF
V
V
C
= ±15V
CM
= 10pF
S
S
V = ±15V
S
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–0.7
0.5
= –14V
= 14.7V
–55°C
125°C
L
L
125°C
25°C
–55°C
125°C
25°C
–55°C
25°C
PHASE
GAIN
GAIN
PHASE
125°C
25°C
0.4
0.3
0.2
0.1
–55°C
–10
–20
–10
–20
–V + 0
S
0.1
1
10
100
0.1
1
10
100
–10 –8 –6 –4 –2
0
2
4
6
8
10
I
I
FREQUENCY (MHz)
SINK
SOURCE
FREQUENCY (MHz)
OUTPUT CURRENT (mA)
1677 G36
1677 G35
1677 G27
1677fa
10
LT1677
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Total Harmonic Distortion and
Noise vs Frequency for
Noninverting Gain
Output Short-Circuit Current
vs Time
Closed-Loop Output Impedance
vs Frequency
0.1
0.01
50
40
30
20
10
100
10
V
= ±15V
Z
= 2k/15pF
S
L
–55°C
V
V
A
= ±15V
S
O
V
= 10V
P-P
= +1, +10, +100
25°C
MEASUREMENT BANDWIDTH
= 10Hz TO 80kHz
125°C
1
A
= 100
V
A
V
= +100
–30
–35
–40
–45
–50
0.1
25°C
0.001
0.0001
A
= 10
V
125°C
–55°C
A
= +1
V
0.01
0.001
A
= 1
V
10
100
1k
10k
100k
1M
0
2
3
1
4
20
100
1k
10k 20k
TIME FROM OUTPUT SHORT TO GND (MIN)
FREQUENCY (Hz)
FREQUENCY (Hz)
1677 G29
1677 G30
1677 G28
Total Harmonic Distortion and
Noise vs Frequency for Inverting
Gain
Total Harmonic Distortion and
Noise vs Output Amplitude for
Noninverting Gain
Total Harmonic Distortion and
Noise vs Output Amplitude for
Inverting Gain
0.1
0.01
1
1
Z
= 2k/15pF
= ±15V
Z
L
= 2k/15pF
= ±15V
Z
= 2k/15pF
L
S
L
V
f
V
V
V
A
= ±15V
S
S
O
V
= 1kHz
f
= 1kHz
= 10V
P-P
= –1, –10, – 100
O
O
A
= +1, +10, +100
A
V
= –1, –10, –100
V
0.1
0.01
0.1
MEASUREMENT BANDWIDTH
= 10Hz TO 22kHz
MEASUREMENT BANDWIDTH
= 10Hz TO 22kHz
MEASUREMENT BANDWIDTH
= 10Hz TO 80kHz
A
V
= 100
A
= –100
V
A
V
= –100
0.01
A
V
= 10
A = –10
V
0.001
0.0001
A
= –10
V
A
= –1
A
= 1
0.001
0.001
V
V
A
= –1
100
V
0.0001
0.0001
0.3
1
10
)
30
0.3
1
10
)
30
20
1k
10k 20k
OUTPUT SWING (V
OUTPUT SWING (V
P-P
P-P
FREQUENCY (Hz)
1677 G31
1677 G32
1677 G33
1677fa
11
LT1677
W U U
U
APPLICATIO S I FOR ATIO
General
The adjustment range with a 10kΩ pot is approximately
±2.5mV. Iflessadjustmentrangeisneeded, thesensitiv-
ityandresolutionofthenullingcanbeimprovedbyusing
a smaller pot in conjunction with fixed resistors. The
example has an approximate null range of ±200µV
(Figure 3).
The LT1677 series devices may be inserted directly into
OP-07,OP-27,OP-37andsocketswithorwithoutremoval
of external compensation or nulling components. In addi-
tion, the LT1677 may be fitted to 741 sockets with the
removal or modification of external nulling components.
10k
15V
Rail-to-Rail Operation
1
To take full advantage of an input range that can exceed
the supply, the LT1677 is designed to eliminate phase
reversal. ReferringtothephotographsshowninFigure1,
the LT1677 is operating in the follower mode (AV = +1) at
asingle3Vsupply. TheoutputoftheLT1677clipscleanly
and recovers with no phase reversal. This has the benefit
of preventing lock-up in servo systems and minimizing
distortion components.
–
2
3
8
7
6
OUTPUT
LT1677
INPUT
+
4
–15V
1677 F02
Figure 2. Standard Adjustment
1k
Offset Voltage Adjustment
15V
4.7k
The input offset voltage of the LT1677 and its drift with
temperature are permanently trimmed at wafer
testing to a low level. However, if further adjustment of
VOS is necessary, the use of a 10kΩ nulling potentiometer
will not degrade drift with temperature. Trimming to a
value other than zero creates a drift of (VOS/300)µV/°C,
e.g., if VOS is adjusted to 300µV, the change in drift will be
1µV/°C (Figure 2).
4.7k
1
–
2
3
8
LT1677
4
7
6
OUTPUT
+
–15V
1677 F03
Figure 3. Improved Sensitivity Adjustment
LT1677 Output
Input = –0.5V to 3.5V
3V
2V
1V
0V
3V
2V
1V
0V
–0.5V
–0.5V
1577 F01a
1577 F01b
Figure 1. Voltage Follower with Input Exceeding the Supply Voltage (V = 3V)
S
1677fa
12
LT1677
W U U
APPLICATIO S I FOR ATIO
U
Offset Voltage and Drift
As with all operational amplifiers when RF > 2k, a pole will
be created with RF and the amplifier’s input capacitance,
creating additional phase shift and reducing the phase
margin.Asmallcapacitor(20pFto50pF)inparallelwithRF
will eliminate this problem.
Thermocouple effects, caused by temperature gradients
across dissimilar metals at the contacts to the input
terminals, can exceed the inherent drift of the amplifier
unless proper care is exercised. Air currents should be
minimized, package leads should be short, the two input
leadsshouldbeclosetogetherandmaintainedatthesame
temperature.
Noise Testing
The 0.1Hz to 10Hz peak-to-peak noise of the LT1677 is
measured in the test circuit shown (Figure 6a). The fre-
quency response of this noise tester (Figure 6b) indicates
that the 0.1Hz corner is defined by only one zero. The test
time to measure 0.1Hz to 10Hz noise should not exceed
ten seconds, as this time limit acts as an additional zero to
eliminate noise contributions from the frequency band
below 0.1Hz.
Thecircuitshowntomeasureoffsetvoltageisalsousedas
the burn-in configuration for the LT1677, with the supply
voltages increased to ±20V (Figure 4).
50k*
15V
–
2
7
Measuring the typical 90nV peak-to-peak noise perfor-
mance of the LT1677 requires special test precautions:
6
100Ω* LT1677
V
OUT
+
3
V
= 1000V
OS
OUT
4
1. The device should be warmed up for at least five
minutes. As the op amp warms up, its offset voltage
changes typically 3µV due to its chip temperature
increasing 10°C to 20°C from the moment the power
suppliesareturnedon. Intheten-secondmeasurement
interval these temperature-induced effects can easily
exceed tens of nanovolts.
*RESISTORS MUST HAVE LOW
THERMOELECTRIC POTENTIAL
50k*
–15V
1677 F04
Figure 4. Test Circuit for Offset Voltage and
Offset Voltage Drift with Temperature
Unity-Gain Buffer Application
2. For similar reasons, the device must be well shielded
from air currents to eliminate the possibility of
thermoelectric effects in excess of a few nanovolts,
which would invalidate the measurements.
When RF ≤ 100Ω and the input is driven with a fast, large-
signal pulse (>1V), the output waveform will look as
shown in the pulsed operation diagram (Figure 5).
During the fast feedthrough-like portion of the output, the
input protection diodes effectively short the output to the
inputandacurrent, limitedonlybytheoutputshort-circuit
protection, will be drawn by the signal generator. With
RF ≥ 500Ω, the output is capable of handling the current
requirements (IL ≤ 20mA at 10V) and the amplifier stays
in its active mode and a smooth transition will occur.
3. Sudden motion in the vicinity of the device can also
“feedthrough” to increase the observed noise.
Current noise is measured in the circuit shown in Figure 7
and calculated by the following formula:
1/ 2
⎡
⎢
2⎤
2
)
− 130nV
e
• 101
⎥
(
)
(
no
R
F
⎣
⎦
i =
n
1MΩ 101
(
)(
)
–
2.5V/µs
OUTPUT
The LT1677 achieves its low noise, in part, by operating
the input stage at 100µA versus the typical 10µA of most
other op amps. Voltage noise is inversely proportional
while current noise is directly proportional to the square
1677fa
+
LT1677
1677 F05
Figure 5. Pulsed Operation
13
LT1677
W U U
U
APPLICATIO S I FOR ATIO
100
90
80
70
60
50
40
30
0.1µF
100k
10Ω
–
2k
*
+
22µF
LT1677
SCOPE
× 1
IN
4.3k
+
LT1001
4.7µF
R
= 1M
–
110k
2.2µF
VOLTAGE GAIN
100k
= 50,000
0.1µF
0.01
0.1
1
10
100
*DEVICE UNDER TEST
NOTE: ALL CAPACITOR VALUES ARE FOR
NONPOLARIZED CAPACITORS ONLY
24.3k
FREQUENCY (Hz)
1677 F06a
1677 F06b
Figure 6b. 0.1Hz to 10Hz Peak-to-Peak
Noise Tester Frequency Response
Figure 6a. 0.1Hz to 10Hz Noise Test Circuit
root of the input stage current. Therefore, the LT1677’s
currentnoisewillberelativelyhigh.Atlowfrequencies,the
low 1/f current noise corner frequency (≈90Hz) mini-
mizes current noise to some extent.
100k
100Ω
500k
–
LT1677
e
no
500k
+
In most practical applications, however, current noise will
not limit system performance. This is illustrated in the
Total Noise vs Source Resistance plot (Figure 8) where:
1677 F07
Figure 7
Total Noise = [(op amp voltage noise)2 + (resistor noise)2
+ (current noise RS)2]1/2
Three regions can be identified as a function of source
resistance:
1000
R
R
V
= ±15V
= 25°C
S
A
T
(i) RS ≤ 400Ω. Voltage noise dominates
SOURCE RESISTANCE = 2R
100
10
1
(ii) 400Ω ≤ RS ≤ 50k at 1kHz
400Ω ≤ RS ≤ 8k at 10Hz
Resistor noise
dominates
AT 1kHz
}
AT 10Hz
(iii) RS > 50k at 1kHz
RS > 8k at 10Hz
Current noise
dominates
}
RESISTOR
NOISE ONLY
ClearlytheLT1677shouldnotbeusedinregion(iii),where
total system noise is at least six times higher than the
voltage noise of the op amp, i.e., the low voltage noise
specification is completely wasted. In this region the
LT1792 or LT1793 is the best choice.
0.1
1
10
100
SOURCE RESISTANCE (kΩ)
1677 F08
Figure 8. Total Noise vs Source Resistance
1677fa
14
LT1677
W U U
APPLICATIO S I FOR ATIO
U
Rail-to-Rail Input
Rail-to-Rail Output
The LT1677 has the lowest voltage noise, offset voltage
and highest gain when compared to any rail-to-rail op
amp. The input common mode range for the LT1677 can
exceed the supplies by at least 100mV. As the common
mode voltage approaches the positive rail (+VS – 0.7V),
the tail current for the input pair (Q1, Q2) is reduced,
which prevents the input pair from saturating (refer to the
Simplified Schematic). The voltage drop across the load
resistorsRC1, RC2 isreducedtolessthan200mV, degrad-
ing the slew rate, bandwidth, voltage noise, offset voltage
and input bias current (the cancellation is shut off).
The rail-to-rail output swing is achieved by using transis-
tor collectors (Q28, Q29) instead of customary class A-B
emitter followers for the output stage. Referring to the
SimplifiedSchematic,theoutputNPNtransistor(Q29)sinks
the current necessary to move the output in the negative
direction. The change in Q29’s base emitter voltage is re-
flecteddirectlytothegainnode(collectorsofQ20andQ16).
For large sinking currents, the delta VBE of Q29 can domi-
nate the gain. Figure 9 shows the change in input voltage
for a change in output voltage for different load resistors
connected between the supplies. The gain is much higher
for output voltages above ground (Q28 sources current)
since the change in base emitter voltage of Q28 is attenu-
ated by the gain in the PNP portion of the output stage.
Therefore, for positive output swings (output sourcing
current) there is hardly any change in input voltage for any
load resistance. Highest gain and best linearity is achieved
when the output is sourcing current, which is the case in
singlesupplyoperationwhentheloadisgroundreferenced.
Figure 10 shows gains for both sinking and sourcing load
currents for a worst-case load of 600Ω.
When the input common mode range goes below 1.5V
above the negative rail, the NPN input pair (Q1, Q2) shuts
off and the PNP input pair (Q8, Q9) turns on. The offset
voltage, input bias current, voltage noise and bandwidth
are also degraded. The graph of Offset Voltage Shift vs
Common Mode shows where the knees occur by display-
ing the change in offset voltage. The change-over points
aretemperaturedependent,see thegraphCommonMode
Range vs Temperature.
RL TO 5V
RL = 600
RL = 1k
R
L = 10k
RL TO 0V
0
1
2
3
4
5
–15 –10 –5
0
5
10 15
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
TA = 25°C
VS = 5V
TA = 25°C
VS = ±15V
RL = 600Ω
RL CONNECTED TO 0V
MEASURED ON TEKTRONIX 577 CURVE TRACER
MEASURED ON TEKTRONIX 577 CURVE TRACER
Figure 10. Voltage Gain Single Supply
Figure 9. Voltage Gain Split Supply
1677fa
15
LT1677
U
TYPICAL APPLICATIO S
Microvolt Comparator with Hysteresis
3V Strain Gauge Amplifier
3V
3V
10M
5%
15k
1%
R9
R8
R7
3.4Ω
7.5Ω
22.1Ω
7
R11
1k
3
2
+
–
15k
1%
1
R2
5Ω
R3
R5
698Ω
R*
R*
R*
6
5.49k
OUTPUT
INPUT
LT1677
4
R10
232Ω
3V
R*
+
1677 TA03
V
LT1677
OUT
POSITIVE FEEDBACK TO ONE OF THE NULLING TERMINALS
CREATES APPROXIMATELY 5µV OF HYSTERESIS. OUTPUT
CAN SINK 16mA
INPUT OFFSET VOLTAGE IS TYPICALLY CHANGED LESS THAN
5µV DUE TO THE FEEDBACK
–
R*
R*
FOR TEMP
COMPENSATION
OF GAIN
R4
5.49k
R2
5Ω
*OMEGA SG-3/350LY11
350Ω, 1%
ALL OTHER RESISTORS 1%
R6
22.1Ω
1677 TA06
2 • R* + R6
R6
R4
R2 + (R*/2)
A
V
=
≅ 1000
(
) (
)
TRIM R11 FOR BRIDGE BALANCE
Precision High Side Current Sense
SOURCE
3V < V < 36V
S
R
IN
1k
2
–
7
R
LINE
0.1Ω
6
ZETEX
LT1677
4
BC856B
3
+
V
OUT
R
OUT
V
R
OUT
LOAD
OUT
20k
= R
LINE
I
R
LOAD
IN
= 2V/AMP
1677 TA07
1677fa
16
LT1677
U
TYPICAL APPLICATIO S
3V Super Electret Microphone Amplifier with DC Servo
1.5V
2N3906
1.5V
2N3906
C1
10pF
C3
0.022µF
7Hz POLE FOR SERVO
R5
2k
1.5V
7
16kHz
ROLL OFF
R1
R3
1M
1M
–
+
2
3
6
LT1677
4
1.5V
7
–
2
3
6
–1.5V
LT1677
+
4
R2
80k
C2
100pF
–1.5V
20kHz
ROLL OFF
C4
1µF
1.5V
R4
8k
–
2
3
PANASONIC
ELECTRET
TO
7
HEADPHONES
6
CONDENSER
MICROPHONE
WM-61
LT1677
+
4
(714) 373-7334
–1.5V
–1.5V
1677 TA05
1677fa
17
LT1677
W
W
SI PLIFIED SCHE ATIC
+
+
1677fa
18
LT1677
U
PACKAGE DESCRIPTIO
Dimensions in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
.400*
(10.160)
MAX
8
7
6
5
4
.255 ± .015*
(6.477 ± 0.381)
1
2
3
.130 ± .005
.300 – .325
.045 – .065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
.065
(1.651)
TYP
.008 – .015
(0.203 – 0.381)
.120
.020
(0.508)
MIN
(3.048)
MIN
+.035
.325
–.015
.018 ± .003
(0.457 ± 0.076)
.100
(2.54)
BSC
+0.889
8.255
(
)
N8 1002
–0.381
NOTE:
INCHES
1. DIMENSIONS ARE
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
.045 ±.005
.160 ±.005
NOTE 3
.050 BSC
7
5
8
6
.245
MIN
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
3
4
2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
× 45°
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
.050
(1.270)
BSC
.014 – .019
(0.355 – 0.483)
TYP
NOTE:
INCHES
1. DIMENSIONS IN
(MILLIMETERS)
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
SO8 0303
1677fa
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-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
19
LT1677
U
TYPICAL APPLICATIO
This 2-wire remote Geophone preamp operates on a
current-loop principle and so has good noise immunity.
Quiescent current is ≈10mA for a VOUT of 2.5V. Excitation
will cause AC currents about this point of ~±4mA for a
gain of ~107. Components R5 and Q1 convert the voltage
into a current for transmission back to R10, which con-
verts it into a voltage again. The LM334 and 2N3904 are
not temperature compensated so the DC output contains
temperature information.
V
OUT of ~±1V max. The op amp is configured for a voltage
2-Wire Remote Geophone Preamp
R9
20Ω
+
V
V
LINEAR
TECHNOLOGY
LM334Z
R
–
R8
11Ω
6mA
Q1
12V
3V
2N3904
R2
R6
C
100k
R4
4.99k
+
R
C3
14k
LT1431CZ
220µF
R7
24.9k
A
R5
243Ω
V
R1
365Ω
OUT
2.5V ±1V
2 –
C2
0.1µF
R10
250Ω
7
LT1677
4
GEOSPACE
GS-20DX
L
–
+
6
R
= 630Ω
3
+
GEOPHONE
www.geospacecorp.com/default.htm
C4
R3
16.2k
(713) 939-7093
1000pF
1677 TA04
||
R2 + R3 R4
≅ 107
A
=
V
R1 + R
L
RELATED PARTS
PART NUMBER
LT1028/LT1128
LT1115
DESCRIPTION
Ultralow Noise Precision Op Amps
Ultralow Noise, Low distortion Audio Op Amp
Dual/Quad Low Noise, High Speed Precision Op Amps
COMMENTS
Lowest Noise 0.85nV/√Hz
0.002% THD, Max Noise 1.2nV/√Hz
Similar to LT1007
LT1124/LT1125
LT1126/LT1127
LT1226
Dual/Quad Decompensated Low Noise, High Speed Precision Op Amps
Low Noise, Very High Speed Op Amp
Similar to LT1037
1GHz, 2.6nV/√Hz, Gain of 25 Stable
Precision C-LoadTM Stable
4.2nV/√Hz, 10fA/√Hz
LT1498/LT1499
LT1792
10MHz, 5V/µs, Dual/Quad Rail-to-Rail Input and Output Op Amps
Low Noise, Precision JFET Input Op Amp
LT1793
Low Noise, Picoampere Bias Current Op Amp
6nV/√Hz, 1fA/√Hz, I = 10pA Max
B
LT1806
Low Noise, 325MHz Rail-to-Rail Input and Output Op Amp
Dual/Quad Rail-to-Rail Output Picoamp Input Precision Op Amps
Dual/Quad Rail-to-Rail Output Picoamp Input Precision Op Amps
3.5nV/√Hz
LT1881/LT1882
LT1884/LT1885
C
to 1000pF, I = 200pA Max
LOAD B
2.2MHz Bandwidth, 1.2V/µs SR
C-Load is a trademark of Linear Technology Corporation.
1677fa
LT 0306 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
20
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
© LINEAR TECHNOLOGY CORPORATION 2000
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