LT1462/LT1463
Dual/Quad Micropower,
260µW C-Load Picoampere
Bias Current JFET Input Op Amps
FEATURES
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DESCRIPTION
The LT
®
1462 (dual) and LT1463 (quad) are the first
micropower op amps (45µA max per amp) to offer
picoampere input bias currents (1pA typ) and unity gain
stability for capacitive loads up to 10nF. The output can
swing a 10k load to within 1.5V of either supply, just like
op amps that require an order of magnitude more supply
current. This unique combination of performance makes
the LT1462/LT1463 ideal over a wide range of input and
output impedances.
In the design and testing of the LT1462/LT1463, particular
emphasis has been placed on optimizing performance in
the low cost SO-8 (dual) and 14-lead SO package (quad) for
±15V
and
±5V
supplies. The input common mode range
includes the positive rail. Slew rate (0.08V/µs min) and gain
bandwidth product (125kHz min) are 100% tested. A full set
of matching specifications is also provided.
, LTC and LT are registered trademarks of Linear Technology Corporation.
C-Load is a trademark of Linear Technology Corporation.
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Input Bias Current:
2pA Max (LT1462A)
20pA Max (LT1462, LT1463)
Supply Current per Amplifier: 45
µ
A Max
Unity-Gain Stable for C-Load
TM
Up to 10nF
Input Common Mode Range Includes Positive Rail
Guaranteed Specs with
±5V, ±15V
Supplies
Gain Bandwidth Product: 175kHz Typ
Slew Rate: 0.13V/µs Typ
Guaranteed Matching Specifications
Standard Pinout: SO-8, SO-14 Package
APPLICATIONS
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Battery-Powered Systems
Photocurrent Amplifiers
Low Frequency, Micropower Active Filters
Low Droop Track-and-Hold Circuits
TYPICAL APPLICATION
Low Power Logging Amplifier
R8
100k
D1
1N4148
C1
1nF
R5
24k
C5
200pF
1
D3
1N4148
R6
100k
12
Q1
2N3904
C5
1µF
R9
1M
DC
OUT C3
0.47µF
7
C4
10µF
8
AC
OUT
R3
10k
5
+
AMP 3
1/4 LT1463
PHOTODIODE
R2
24k
C2
200pF
+
3
–
R1
100Ω
5V
2
4
6
–
1/4 LT1463
11
–5V
R7
10M
R10
50k
10
+
1/4 LT1463
9
–
R11
1M
+
1/4 LT1463
14
13
–
R4
10M
D2
1N4148
R3
100k
INPUT
DC OUTPUT
CURRENT VOLTAGE OF AMP 3
10pA
–0.145V
100pA
–0.341V
1nA
–0.518V
10nA
–0.684V
100nA
–0.846V
1
µA
–0.995V
10
µA
–1.13V
100
µA
–1.25V
1mA
–1.37V
R12
10k
1462 • TA01
U
U
U
Small-Signal Response, C
L
= 10nF
A
V
= 1
V
S
=
±5V, ±15V
C
L
= 10nF
1462 • TA02
1
LT1462/LT1463
ABSOLUTE
MAXIMUM
RATINGS
Supply Voltage .....................................................
±20V
Differential Input Voltage .......................................
±40V
Input Current ....................................................... 20mA
Output Short-Circuit Duration ......................... Indefinite
Operating Temperature Range ............... – 40°C to 85°C
Specified Temperature Range ................ – 40°C to 85°C
Maximum Junction Temperature ......................... 150°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
OUT A 1
–IN A 2
+IN B 3
V
–
4
A
B
8
7
6
5
V
+
OUT B
–IN B
+IN B
ORDER PART
NUMBER
LT1462ACN8
LT1462ACS8
LT1462CN8
LT1462CS8
S8 PART MARKING
1462
1462A
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 130°C/ W (N)
T
JMAX
= 150°C,
θ
JA
= 190°C/ W (S)
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
OS
I
OS
I
B
e
n
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Voltage Density
Input Noise Current Density
CMRR
PSRR
R
IN
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Input Resistance—Differential
Common Mode
Common Mode
Input Capacitance
Large-Signal Voltage Gain
V
S
=
±5V
V
S
=
±15V
V
S
=
±5V
V
S
=
±15V
V
S
=
±5V
V
S
=
±15V
0.1Hz to 10Hz
f
O
= 10Hz
f
O
= 1000Hz
V
S
=
±15V,
V
CM
= 0V, T
A
= 25°C, unless otherwise noted.
LT1462AC
MIN
TYP
MAX
0.4
0.6
0.3
0.5
±0.5
±1
2
92
76
0.5
76
81
89
90
10
12
10
12
10
11
3
100
50
600
200
100
50
74
78
0.8
2.0
1.2
2.0
±2.0
±3.0
LT1462C/LT1463C
MIN
TYP
MAX
0.4
0.6
0.5
±
1
2
92
76
0.5
89
90
10
12
10
12
10
11
3
600
200
0.8
2.0
15
±20
UNITS
mV
mV
pA
pA
pA
pA
µV
P-P
nV/√Hz
nV/√Hz
fA/√Hz
dB
dB
Ω
Ω
Ω
pF
V/mV
V/mV
CONDITIONS (Note 1)
f
O
= 10Hz, 1kHz (Note 3)
V
CM
= – 12.5V to 15V
V
S
=
±2.5V
to
±20V
V
CM
= – 12.5V to 8V
V
CM
= 8V to 15V
V
O
=
±10V,
R
L
= 10k
V
S
=
±5V,
V
O
=
±2V,
R
L
= 10k
C
IN
A
VOL
2
U
U
W
W W
U
W
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
ORDER PART
NUMBER
LT1463CN
LT1463CS
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)
LT1462/LT1463
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
OUT
Output Voltage Swing
V
S
=
±15V,
V
CM
= 0V, T
A
= 25°C, unless otherwise noted.
MIN
±13.5
±11.0
±3.5
±13
LT1462AC
TYP
MAX
±13.7
±12.4
±3.7
±17
0.13
175
28
26
132
0.5
0.8
0.4
0.5
74
78
85
88
1.3
3.0
3.0
4.0
72
76
45
43
LT1462C/LT1463C
MIN
TYP
MAX
±13.5
±11.0
±3.5
±13
0.08
125
±13.7
±12.4
±3.7
±17
0.13
175
28
26
132
0.5
0.8
0.5
85
88
1.3
3.0
20
45
43
UNITS
V
V
V
mA
V/µs
kHz
µA
µA
dB
mV
mV
pA
pA
dB
dB
CONDITIONS (Note 1)
R
L
= 10k
R
L
= 2k
V
S
=
±5V,
R
L
= 2k
I
O
SR
GBW
I
S
Output Current
Slew Rate
Gain Bandwidth Product
Supply Current per Amplifier
V
S
=
±5V
Channel Separation
f = 10Hz, V
O
=
±10V,
R
L
= 10k
V
S
=
±5V
V
S
=
±15V
V
S
=
±5V
V
S
=
±15V
(Notes 5, 7)
(Notes 5, 7)
R
L
= 10k (Note 4)
f = 10kHz
0.08
125
V
OS
∆I
B+
∆CMRR
∆PSRR
Offset Voltage Match (Note 7)
Noninverting Bias Current Match
(Note 7)
Common Mode Rejection Match
Power Supply Rejection Match
V
S
=
±15V,
V
CM
= 0V, 0°C
≤
T
A
≤
70°C, unless otherwise noted.
SYMBOL PARAMETER
V
OS
∆V
OS
∆Temp
I
OS
I
B
CMRR
PSRR
A
VOL
I
O
V
OUT
Input Offset Voltage
Average Input Offset Voltage Drift
Input Offset Current
Input Bias Current
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Output Current
Output Voltage Swing
R
L
= 10k
R
L
= 2k
V
S
=
±5V,
R
L
= 2k
R
L
= 10k (Note 4)
f = 10kHz
V
S
=
±5V
Offset Voltage Match (Note 7)
Noninverting Bias Current Match
(Note 7)
V
S
=
±5V
V
S
=
±15V
V
CM
= – 12V to 15V
V
S
=
±3V
to
±20V
V
O
=
±10V,
R
L
= 10k
V
S
=
±5V,
V
O
=
±2V,
R
L
= 2k
CONDITIONS (Note 1)
V
S
=
±5V
V
S
=
±15V
(Note 6)
q
q
q
LT1462AC
MIN
TYP
MAX
0.5
0.9
7
10
60
75
80
90
45
±11
±13.4
±10.5
±3.4
0.075
100
88
89
600
140
±14
±13.6
±12.1
±3.6
0.128
140
31
28
0.7
0.9
5
45
43
2.0
3.5
40
1.4
2.8
20
50
150
LT1462C/LT1463C
MIN
TYP
MAX
0.5
0.9
7
25
150
72
76
90
45
±11
±13.4
±10.5
±3.4
0.075
100
88
89
600
140
±14
±13.6
±12.1
±3.6
0.128
140
31
28
0.7
0.9
35
45
43
2.0
3.5
500
1.4
2.8
20
450
750
UNITS
mV
mV
µV/°C
pA
pA
dB
dB
V/mV
V/mV
mA
V
V
V
V/µs
kHz
µA
µA
mV
mV
pA
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
SR
GBW
I
S
V
OS
∆I
B+
Slew Rate
Gain Bandwidth Product
Supply Current per Amplifier
3
LT1462/LT1463
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
∆CMRR
∆PSRR
Common Mode Rejection Match
Power Supply Rejection Match
(Notes 5, 7)
(Notes 5, 7)
V
S
=
±15V,
V
CM
= 0V, 0°C
≤
T
A
≤
70°C, unless otherwise noted.
LT1462AC
MIN
TYP
MAX
q
q
CONDITIONS (Note 1)
LT1462C/LT1463C
MIN
TYP
MAX
70
74
84
87
UNITS
dB
dB
73
77
84
87
V
S
=
±15V,
V
CM
= 0V, – 40°C
≤
T
A
≤
85°C (Note 2), unless otherwise noted.
SYMBOL PARAMETER
V
OS
∆V
OS
∆Temp
I
OS
I
B
CMRR
PSRR
A
VOL
I
O
V
OUT
Input Offset Voltage
Average Input Offset Voltage Drift
Input Offset Current
Input Bias Current
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Output Current
Output Voltage Swing
R
L
= 10k
R
L
= 2k
V
S
=
±5V,
R
L
= 2k
R
L
= 10k (Note 4)
f = 10kHz
V
S
=
±5V
Offset Voltage Match (Note 7)
Noninverting Bias Current Match
(Note 7)
Common Mode Rejection Match
Power Supply Rejection Match
(Notes 5, 7)
(Notes 5, 7)
V
S
=
±5V
V
S
=
±15V
V
CM
= –12V to 15V
V
S
=
±3V
to
±20V
V
O
=
±10V,
R
L
= 10k
V
S
=
±5V,
V
O
=
±2V,
R
L
= 2k
CONDITIONS (Note 1)
V
S
=
±5V
V
S
=
±15V
(Note 6)
q
q
q
LT1462AC
MIN
TYP
MAX
0.6
1.0
7
40
200
74
79
80
40
±10
±13.2
±10.0
±3.2
0.070
95
87
88
500
120
±13
±13.4
±11.8
±3.4
0.126
135
33
31
0.8
1.0
20
72
76
83
86
50
48
2.5
4.0
100
1.5
3.0
20
150
500
LT1462C/LT1463C
MIN
TYP
MAX
0.6
1.0
7
60
300
70
74
80
40
±10
±13.2
±10.0
±3.2
0.070
95
87
88
500
120
±13
±13.4
±11.8
±3.4
0.126
135
33
31
0.8
1.0
70
68
72
83
86
50
48
2.5
4.0
800
1.5
3.0
20
700
2500
UNITS
mV
mV
µV/°C
pA
pA
dB
dB
V/mV
V/mV
mA
V
V
V
V/µs
kHz
µA
µA
mV
mV
pA
dB
dB
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
SR
GBW
I
S
V
OS
∆I
B+
∆CMRR
∆PSRR
Slew Rate
Gain Bandwidth Product
Supply Current per Amplifier
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1:
Typical parameters are defined as 60% yield of parameter
distributions of individual amplifiers, i.e., out of 100 LT1463s (or 100
LT1462s) typically 240 op amps (or 120) will be better than the indicated
specification.
Note 2:
The LT1462 and LT1463 are designed, characterized and expected
to meet these extended temperature limits, but are not tested at – 40°C
and 85°C. Guaranteed I grade parts are available, consult factory.
Note 3:
Current noise is calculated from the formula: i
n
= (2qi
b
)
1/2
where
q = (1.6)(10
–19
) coulomb. The noise of source resistors up to 1G swamps
the contribution of current noise.
Note 4:
Slew rate is measured in A
V
= –1; input signal is
±7.5V,
output is
measured at
±2.5V.
Note 5:
∆CMRR
and
∆PSRR
are defined as follows:
1. CMRR and PSRR are measured in
µV/V
on the individual amplifiers.
2. The difference is calculated between the matching sides in
µV/V.
3. The result is converted to dB.
Note 6:
This parameter is not 100% tested.
Note 7:
Matching parameters are the difference between amplifiers A and
D and between B and C on the LT1463; between the two amplifiers on the
LT1462.
4
LT1462/LT1463
TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias and Offset Current vs
Temperature
10000
20
V
S
=
±15V
V
CM
= 0V
LT1462/LT1463
LT1462A
V
S
=
±15V
T
A
= 25°C
INPUT BIAS AND OFFSET CURRENT (pA)
1000
COMMON MODE RANGE (V)
10
–5
0
5
–10
COMMON MODE INPUT VOLTAGE (V)
15
LT1462 • TPC02
INPUT BIAS CURRENT (pA)
100
BIAS CURRENT
10
OFFSET CURRENT
1
0
25
75
100
50
AMBIENT TEMPERATURE (°C)
125
Supply Current vs Temperature
60
SUPPLY CURRENT PER AMPLIFIER (µA)
40
V
S
=
±15V
V
S
=
±5V
20
30
100
1/f CORNER = 5Hz
30
0.1
10
25 50 75
–75 –50 –25 0
TEMPERATURE (°C)
100 125
LT1462 • TPC04
NOISE VOLTAGE (2µV/DIV)
50
RMS VOLTAGE NOISE DENSITY (nV/√Hz)
Voltage Gain vs Temperature
1000
900
800
V
O
=
±10V,
V
S
=
±15V
V
O
=
±2V,
V
S
=
±5V
R
L
= 10k
V
S
=
±15V
SLEW RATE (V/µs)
VOLTAGE GAIN (V/mV)
0.15
SLEW FALL
0.13
GAIN BANDWIDTH
0.11
300
700
600
500
400
300
200
100
CHANNEL SEPARATION (dB)
V
S
=
±5V
0
–75 –50 –25 0 25 50 75
TEMPERATURE (°C)
U W
LT1462 • TPC01
LT1463 • TPC07
Input Bias Current Over the
Common Mode Range
16
15
14
13
12
Common Mode Range vs
Temperature
15
10
5
–11
–12
–13
–14
V
S
=
±15V
–15
–75 –50 –25 0 25 50 75 100 125
TEMPERATURE (°C)
LT1462 • TPC03
0
–5
–15
Voltage Noise vs Frequency
1000
V
S
=
±15V
T
A
= 25°C
0.1Hz to 10Hz Noise
1
10
100
FREQUENCY (Hz)
1000
LT1462 • TPC05
0
2
6
4
TIME (SEC)
8
10
LT1462 • TPC06
Slew Rate, Gain Bandwidth
Product vs Temperature
0.17
V
S
=
±15V
SLEW RISE
GAIN BANDWIDTH (kHz)
Channel Separation vs Frequency
400
160
140
V
S
=
±15V
T
A
= 25°C
R
L
= 10k
120
200
100
100
80
100 125
0.09
–75 –50 –25
0
0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1462 • TPC08
60
10
100
10k
1k
FREQUENCY (Hz)
100k
1M
LT1462 • TPC09
5
FPGA/CPLD
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