1
LT1457
s
Handles 10,000pF Capacitive Load
s
450
V Max Offset Voltage
s
1200
V Max Offset Voltage in S8 Package
s
50pA Bias Current at 70
C
s
13nV/
Hz Voltage Noise
s
4V/
s Slew Rate
s
4
V/
C Drift
s
130dB Channel Separation
The LT1457 is a dual, JFET input op amp optimized for
handling large capacitive loads in combination with preci-
sion performance.
Precision specifications include 220
V offset voltage in
plastic and surface mount packages. At 70
C input bias
current is 50pA, input offset current is 20pA. Channel
separation is 130dB.
Other dual JFET input op amps from Linear Technology
include the LT1057, which is three times faster than the
LT1457 but at the expense of significantly lower capacitive
load handling capability; and the LT1113 with 4.5nV/
Hz
voltage noise.
Dual, Precision
JFET Input Op Amp
FEATURES
DESCRIPTIO
N
U
V
S
= 15V
T
A
= 25
C
A
V
= +1
CAPACITIVE LOAD (nF)
0
20
60
40
80
100
OVERSHOOT (%)
100
LT11457 TA01
0.1
1
10
Capacitive Load Handling
Input Offset Voltage Distribution
S8 Package
s
Sample-and-Hold (Drives Large Hold Capacitors)
s
A/D and D/A Converters
s
Photodiode Amplifiers
s
Voltage-to-Frequency Converters
APPLICATIO
N
S
U
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
INPUT OFFSET VOLTAGE (mV)
0
3
6
9
15
12
18
21
PERCENT OF UNITS
1.0
LT1457 TA02
1.0
0.6
0.2
0.6
0.2
0.8
0.4
0
0.8
0.4
V
S
=
15V
T
A
= 25
C
400 DUALS
(800 OP AMPS)
TESTED FROM
3 RUNS
2
LT1457
LT1457ACN8
LT1457CN8
ORDER PART
NUMBER
Supply Voltage ......................................................
20V
Differential Input Voltage .......................................
40V
Input Voltage .......................... Equal to Supply Voltages
Output Short-Circuit Duration .......................... Indefinite
Operating Temperature Range ................ 40
C to 85
C
Storage Temperature Range ................. 65
C to 150
C
Lead Temperature (Soldering, 10 sec).................. 300
C
ABSOLUTE
M
AXI
M
U
M
RATINGS
W
W
W
U
PACKAGE/ORDER I
N
FOR
M
ATIO
N
W
U
U
LT1457S8
8
7
6
5
4
3
2
1
IN A
+IN A
V
+
TOP VIEW
N8 PACKAGE
8-LEAD PLASTIC DIP
OUT A
OUT B
V
IN B
+IN B
A
B
T
JMAX
= 115
C,
JA
= 130
C/ W
8
7
6
5
4
3
2
1
V
+IN B
IN A
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SOIC
+IN A
OUT A
IN B
V
+
OUT B
B
A
NOTE: THIS PIN CONFIGURATION DIFFERS FROM
THE 8-LEAD DIP PIN LOCATIONS. INSTEAD, IT
FOLLOWS THE INDUSTRY STANDARD LT1013DS8
SO PACKAGE CONFIGURATION.
T
JMAX
= 130
C,
JA
= 190
C/ W
S8 PART MARKING
1457
Consult factory for Industrial and Military grade parts.
LT1457AC
LT1457C/LT1457S8
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT1457AC/C
150
450
200
800
V
LT1457S8
220
1200
V
I
OS
Input Offset Current
Fully Warmed Up
3
40
4
50
pA
I
B
Input Bias Current
Fully Warmed Up
5
50
7
75
pA
Input Resistance -Differential
10
12
10
12
-Common-Mode
V
CM
= 11V to 8V
10
12
10
12
V
CM
= 8V to 11V
10
11
10
11
Input Capacitance
4
4
pF
e
n
Input Noise Voltage
0.1Hz to 10Hz
2.0
2.1
V
PP
e
n
Input Noise Voltage Density
f
O
= 10Hz
26
28
nV/
Hz
f
O
= 1kHz (Note 2)
13
22
14
24
nV/
Hz
i
n
Input Noise Current Density
f
O
= 10Hz, 1kHz (Note 3)
1.5
4
1.8
6
fA/
Hz
A
VOL
Large-Signal Voltage Gain
V
O
=
10V, R
L
= 2k
150
350
100
300
V/mV
V
O
=
10V, R
L
= 1k
120
250
80
220
V/mV
Input Voltage Range
10.5
14.3
10.5
14.3
V
11.5
11.5
V
CMRR
Common-Mode Rejection Ratio
V
CM
=
10.5V
86
100
82
98
dB
PSRR
Power Supply Rejection Ratio
V
S
=
4.5V to
18V
88
103
86
102
dB
V
OUT
Output Voltage Swing
R
L
= 2k
12
13
12
13
V
SR
Slew Rate
2
4
2
4
V/
s
V
S
=
15V, T
A
= 25
C,V
CM
= 0V unless otherwise noted. (Note 1)
ELECTRICAL CHARACTERISTICS
3
LT1457
GBW
Gain-Bandwidth Product
(Note 5)
1.0
1.7
1.0
1.7
MHz
I
S
Supply Current Per Amplifier
1.8
3.0
1.8
3.0
mA
Channel Separation
DC to 5kHz, V
IN
=
10V
132
130
dB
LT1457AC
LT1457C/LT1457S8
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
S
=
15V, T
A
= 25
C,V
CM
= 0V unless otherwise noted. (Note 1)
ELECTRICAL CHARACTERISTICS
V
S
=
15V, V
CM
= 0V, 0
C
T
A
70
C, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
LT1457AC
LT1457C/LT1457S8
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT1457AC/C
q
350
1100
400
1800
V
LT1457S8
q
500
2300
V
Average Temperature Coefficient of
q
3
10
4
16
V/
C
Input Offset Voltage
I
OS
Input Offset Current
Warmed Up, T
A
= 85
C
0.1
0.5
0.1
0.6
nA
I
B
Input Bias Current
Warmed Up, T
A
= 85
C
0.2
0.7
0.2
0.9
nA
A
VOL
Large-Signal Voltage Gain
V
O
=
10V, R
L
= 2k
q
40
120
30
110
V/mV
CMRR
Common-Mode Rejection Ratio
V
CM
=
10.4V
q
84
97
80
95
dB
PSRR
Power Supply Rejection Ratio
V
S
=
5V to
17V
q
86
100
83
98
dB
V
OUT
Output Voltage Swing
R
L
= 2k
q
12
12.7
12
12.6
V
I
S
Supply Current Per Amplifier
T
A
= 40
C
3.8
3.8
mA
T
A
= 85
C
1.7
1.7
mA
V
S
=
15V, V
CM
= 0V, 40
C
T
A
85
C, unless otherwise noted. (Note 6)
ELECTRICAL CHARACTERISTICS
The
q
denotes the specifications which apply over the full operating
temperature range.
Note 1: Typical parameters are defined as the 60% yield of distributions of
individual amplifiers; i.e., out of 100 LT1457s (200 op amps) typically 120
will be better than the indicated specification.
Note 2: This parameter is tested on a sample basis only.
Note 3: Current noise is calculated from the formula: i
n
= (2qI
b
)
1/2
, where
q = 1.6 x 10
19
coulomb. The noise of source resistors up to 1G
swamps the contribution of current noise.
Note 4: This parameter is not 100% tested.
Note 5: Gain-Bandwidth product is not tested. It is guaranteed by design
and by inference from the slew rate measurement.
Note 6: The LT1457 is not tested and not quality-assurance-sampled at
40
C and at 85
C. These specifications are guaranteed by design,
correlation, and/or inference from 0
C, 25
C, and 70
C tests.
LT1457AC
LT1457C/LT1457S8
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
LT1457AC/C
q
250
900
330
1500
V
LT1457S8
q
400
1900
V
Average Temperature Coefficient of
q
3
10
4
16
V/
C
Input Offset Voltage (Note 4)
I
OS
Input Offset Current
Warmed Up, T
A
= 70
C
18
150
20
250
pA
I
B
Input Bias Current
Warmed Up, T
A
= 70
C
50
250
60
350
pA
A
VOL
Large-Signal Voltage Gain
V
O
=
10V, R
L
= 2k
q
70
220
50
200
V/mV
CMRR
Common-Mode Rejection Ratio
V
CM
=
10.4V
q
85
98
80
96
dB
PSRR
Power Supply Rejection Ratio
V
S
=
4.5V to
18V
q
87
102
84
100
dB
V
OUT
Output Voltage Swing
R
L
= 2k
q
12
12.8
12
12.8
V
I
S
Supply Current Per Amplifier
q
3.2
3.2
mA
T
A
= 70
C
1.7
1.7
mA
4
LT1457
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
V
S
= 15V
V
CM
= 0V
WARMED UP
AMBIENT TEMPERATURE (
C)
3
10
30
100
300
1000
INPUT BIAS AND OFFSET CURRENT (pA)
100
LT1457 TPC01
0
25
50
75
BIAS CURRENT
OFFSET CURRENT
Input Bias and Offset Current vs
Temperature
V
S
= 15V
T
A
= 25
C
N8 PACKAGE
S8 PACKAGE
TIME AFTER POWER ON (MINUTES)
0
60
30
120
90
150
CHANGE IN OFFSET VOLTAGE (
V)
5
LT1457 TPC03
0
1
2
3
4
Warm-Up Drift
V
S
= 15V
T
A
= 70
C
T
A
= 25
C
COMMON-MODE INPUT VOLTAGE (V)
20
20
0
60
40
80
120
140
100
160
INPUT BIAS CURRENT (pA)
15
LT1457 TPC02
15
10
5
0
5
10
Input Bias Current Over
the Common-Mode Range
Input Offset Voltage Distribution
N8 Package
Long Term Drift of
Representative Units
Voltage Gain vs Temperature
V
S
= 15V
V
O
= 10V
R
L
= 2k
R
L
= 1k
TEMPERATURE (
C)
10
100
30
1000
300
VOLTAGE GAIN (V/mV)
100
75
LT1457 TPC05
50
25
25
50
0
V
S
= 15V
T
A
= 25
C
TIME (MONTHS)
50
30
10
10
30
50
OFFSET VOLTAGE CHANGE (
V)
5
40
20
0
20
40
LT1457 TPC06
0
1
2
4
3
0.1Hz to 10Hz Noise
Voltage Noise vs Frequency
Channel Separation vs Frequency
FREQUENCY (Hz)
10
30
50
70
20
100
RMS VOLTAGE NOISE DENSITY (nV/
Hz)
10k
LT1457 TPC07
3
10
30
100
300
1k
3k
1/f CORNER = 28Hz
V
S
= 15V
T
A
= 25
C
V
S
= 15V
T
A
= 25
C
TIME (SECONDS)
NOISE VOLTAGE (1
V/DIV)
10
LT1457 TPC08
0
2
4
8
6
FREQUENCY (Hz)
60
100
80
140
120
160
CHANNEL SEPARATION (dB)
1M
LT1457 TPC09
1
10
100
1k
10k
100k
V
S
= 15V
T
A
= 25
C
V
IN
= 20V
P-P
TO 5kHz
R
L
= 2k
LIMITED BY
THERMAL
INTERACTION AT
DC = 132dB
LIMITED BY PIN TO
PIN CAPACITANCE
R
S
= 10
R
S
= 1k
INPUT OFFSET VOLTAGE (mV)
0.8
PERCENT OF UNITS
12
15
18
0.8
LT1457 TPC04
9
6
0
0.4
0
0.4
3
24
21
0.6
0.2
0.2
0.6
V
S
=
15V
T
A
= 25
C
900 DUALS
(1800 OP AMPS)
TESTED FROM 3
RUNS
5
LT1457
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
FREQUENCY (Hz)
0
20
40
60
100
80
120
CMRR (dB)
10M
LT1457 TPC10
10
100
1k
10k
1M
100k
V
S
= 15V
T
A
= 25
C
Gain, Phase vs Frequency
FREQUENCY (MHz)
15
20
15
10
5
0
5
10
100
80
60
40
20
0
20
25
VOLTAGE GAIN (dB)
PHASE MARGIN (DEG)
10
LT1457 TPC16
0.1
1.0
V
S
= 15V
T
A
= 25
C
PHASE MARGIN = 80
, C
L
= 10pF
PHASE MARGIN = 51
, C
L
= 1000pF
C
L
= 10pF
C
L
= 10pF
GAIN
PHASE
C
L
= 1000pF
C
L
= 1000pF
TEMPERATURE (
C)
2
4
6
8
10
2.5
2.0
1.5
1.0
SLEW RATE (V/
s)
GBW (MHz)
100
LT1457 TPC18
50
25
0
25
50
75
GBW
V
S
= 15V
SLEW FALL
SLEW RISE
TEMPERATURE (
C)
90
100
110
120
CMRR, PSRR (dB)
100
LT1457 TPC12
50
25
0
75
25
50
V
S
= 5V TO 17V FOR PSRR
V
S
= 15V, V
CM
= 10.5V FOR CMRR
PSRR
CMRR
Undistorted Output Swing vs
Frequency
FREQUENCY (Hz)
0
6
18
12
24
30
PEAK TO PEAK OUTPUT SWING (V)
10M
LT11457 TPC17
10k
100k
1M
V
S
= 15V
T
A
= 25
C
TEMPERATURE (
C)
15
13
11
11
13
14
12
10
12
14
15
COMMON -MODE RANGE (V)
100
LT1457 TPC11
50
25
0
25
75
50
V
S
= 15V
Common-Mode Rejection Ratio
vs Frequency
Common-Mode Range vs
Temperature
Common-Mode and Power Supply
Rejections vs Temperature
TIME FROM OUTPUT SHORT TO GROUND (MINUTES)
50
30
10
10
30
40
20
0
20
40
50
SHORT-
CIRCUIT CURRENT (mA)
LT1457 TPC15
0
1
3
2
V
S
= 15V
T
A
= 40
C
T
A
= 85
C
T
A
= 25
C
T
A
= 85
C
T
A
= 40
C
T
A
= 25
C
Short-Circuit Current vs Time
(One Output Shorted to Ground)
Supply Current vs Temperature
TEMPERATURE (
C)
0
1
2
3
SUPPLY CURRENT PER AMPLIFIER (mA)
100
LT1457 TPC14
50
25
0
75
25
50
V
S
= 5V
V
S
= 15V
Slew Rate, Gain-Bandwidth
Product vs Temperature
FREQUENCY (Hz)
0
40
20
60
80
120
100
140
PSRR (dB)
10M
LT1457 TPC13
10
100
1k
10k
1M
100k
T
A
= 25
C
POSITIVE
SUPPLY
NEGATIVE
SUPPLY
Power Supply Rejection Ratio
vs Frequency
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