LT1464/LT1465
Dual/Quad Micropower,
1MHz C-Load Picoampere
Bias Current JFET Input Op Amps
FEATURES
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DESCRIPTION
The LT
®
1464 (dual) and LT1465 (quad) are the first
micropower op amps (200µA max per amp) to offer
picoampere input bias currents (500fA 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 LT1464/LT1465 ideal over a wide range of input and
output impedances.
In the design and testing of the LT1464/LT1465, particular
emphasis has been placed on optimizing performance in
the low cost SO-8 (dual) and 14-lead SO (quad) package for
±15V
and
±5V
supplies. The input common mode range
includes the positive rail. Slew rate (0.5V/µs min) and gain
bandwidth product (650kHz 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 (LT1464A)
20pA Max (LT1464, LT1465)
Supply Current per Amplifier: 200
µ
A Max
Gain Bandwidth Product: 1MHz Typ
Slew Rate: 0.9V/µs Typ
Input Common Mode Range Includes Positive Rail
Unity-Gain Stable for C-Load
TM
Up to 10nF
Open-Loop Gain: 1 Million Typ
Guaranteed Specs with
±5V, ±15V
Supplies
Guaranteed Matching Specifications
Standard Pinout: SO-8, SO-14 Package
APPLICATIONS
s
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Battery-Powered Systems
Photocurrent Amplifiers
Low Frequency, Micropower Active Filters
Low Droop Track-and-Hold Circuits
TYPICAL APPLICATION
Micropower Low Droop Track-and-Hold/Peak Detector
V
+
1/4 LTC201 13
A
16
1 MCT2
4
V
–
5
14
V
+
2
7
R1*
1 MCT2
2
2
5
3
6
4
5
3
6
4
2
5
15
C1
10nF
POLYSTYRENE
Small-Signal Response, C
LOAD
= 10nF
+
1/2 LT1464
–
+
8
1
V
OUT
1/2 LT1464
4
V
–
TYPICAL DROOP =
IN
1/4 LTC201
B
1
6
–
LT1464 • TA01
0.5pA
= 0.05mV/s
10nF
TOTAL SUPPLY CURRENT = 460
µA
MAX
* R1 = 600
Ω
FOR
±15V
SUPPLIES
R1 = 0
Ω
FOR
±5V
SUPPLIES
A
V
= 1
V
S
=
±5V, ±15V
C
L
= 10nF
FUNCTION
Track-and-Hold
Positive Peak Detector
Negative Peak Detector
MODE
Track
Reset
Reset
IN A IN B
0
0
0
0
0
0
MODE IN A IN B
Hold
1
1
Store
0
1
Store
1
0
LTC201 switch is open for logic "1".
U
U
U
1464 • TA02
1
LT1464/LT1465
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
N8 PACKAGE
8-LEAD PDIP
A
B
8
7
6
5
V
+
OUT B
–IN B
+IN B
ORDER PART
NUMBER
LT1464ACN8
LT1464ACS8
LT1464CN8
LT1464CS8
S8 PART MARKING
1464A
1464
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
O
=
±10V,
R
L
= 10k
V
O
=
±10V,
R
L
= 2k
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.
LT1464AC
MIN
TYP
MAX
0.4
0.6
0.2
0.5
±0.4
±0.5
2
33
24
0.4
76
81
85
90
10
12
10
12
0
11
3
350
150
100
50
1000
450
250
170
300
150
100
50
74
78
0.8
2.0
1.2
2.0
±2.0
±3.0
LT1464C/LT1465C
MIN
TYP
MAX
0.4
0.6
0.5
±
0.5
2
33
24
0.4
85
90
10
12
10
12
10
11
3
900
450
250
170
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
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
C
IN
A
VOL
V
S
=
±5V,
V
O
=
±2V,
R
L
= 10k
V
S
=
±5V,
V
O
=
±1V,
R
L
= 2k
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
LT1465CN
LT1465CS
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)
LT1464/LT1465
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
±13.3
±3.5
0.5
650
LT1464AC
TYP
MAX
±13.7
±13.5
±3.7
0.9
1000
145
135
132
0.5
0.8
0.4
0.5
74
78
85
88
1.3
3.3
3.0
4.0
71
74
200
200
LT1464C/LT1465C
MIN
TYP
MAX
±13.5
±13.3
±3.5
0.5
650
±13.7
±13.5
±3.7
0.9
1000
145
135
132
0.5
0.8
0.5
85
88
1.3
3.3
30
200
200
UNITS
V
V
V
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
R
L
= 10k (Note 4)
f = 10kHz
V
S
=
±5V
SR
GBW
I
S
Slew Rate
Gain Bandwidth Product
Supply Current per Amplifier
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)
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
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
V
CM
= – 12V to 15V
V
S
=
±3V
to
±20V
V
O
=
±10V,
R
L
= 10k
V
O
=
±10V,
R
L
= 2k
V
S
=
±5V,
V
O
=
±2V,
R
L
= 10k
V
S
=
±5V,
V
O
=
±1V,
R
L
= 2k
V
OUT
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
CONDITIONS (Note 1)
V
S
=
±5V
V
S
=
±15V
(Note 6)
q
q
q
MIN
LT1464AC
TYP
MAX
0.5
0.9
7
10
60
1.4
2.8
20
50
150
LT1464C/LT1465C
MIN
TYP
MAX
0.5
0.9
7
25
150
73
77
200
100
80
45
±13.4
±13.2
±3.4
0.4
540
85
89
600
350
200
150
±13.6
±13.4
±3.6
0.8
870
160
150
0.7
0.9
35
220
220
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
V/mV
V/mV
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
q
75
80
200
100
80
45
±13.4
±13.2
±3.4
0.4
540
85
89
600
350
200
150
±13.6
±13.4
±3.6
0.8
870
160
150
0.7
0.9
5
220
220
2.0
3.5
40
SR
GBW
I
S
V
OS
∆I
B+
Slew Rate
Gain Bandwidth Product
Supply Current per Amplifier
3
LT1464/LT1465
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.
LT1464AC
MIN
TYP
MAX
q
q
CONDITIONS (Note 1)
LT1464C/LT1465C
MIN
TYP
MAX
70
73
84
85
UNITS
dB
dB
73
77
84
85
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
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
V
CM
= –12V to 15V
V
S
=
±3V
to
±20V
V
O
=
±10V,
R
L
= 10k
V
O
=
±10V,
R
L
= 2k
V
S
=
±5V,
V
O
=
±2V,
R
L
= 10k
V
S
=
±5V,
V
O
=
±1V,
R
L
= 2k
V
OUT
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
CONDITIONS (Note 1)
V
S
=
±5V
V
S
=
±15V
(Note 6)
q
q
q
LT1464AC
MIN
TYP
MAX
0.6
1.0
7
40
200
74
79
175
80
70
45
±13.2
±13.0
±3.2
0.35
510
84
88
400
250
180
140
±13.4
±13.2
±3.4
0.7
850
165
160
0.8
1.0
20
72
76
83
81
230
230
2.5
4.0
100
1.5
3.0
20
150
500
LT1464C/LT1465C
MIN
TYP
MAX
0.6
1.0
7
60
300
72
76
175
80
70
45
±13.2
±13.0
±3.2
0.35
510
84
88
400
250
180
140
±13.4
±13.2
±3.4
0.7
850
165
160
0.8
1.0
70
69
73
83
81
230
230
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
V/mV
V/mV
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
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 LT1465s (or 100
LT1464s) typically 240 op amps (or 120) will be better than the indicated
specification.
Note 2:
The LT1464 and LT1465 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 1GΩ
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 LT1465; between the two amplifiers on the
LT1464.
4
LT1464/LT1465
TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias and Offset Current vs
Temperature
10000
INPUT BIAS AND OFFSET CURRENT (pA)
LT1464/LT1465
LT1464A
1000
INPUT BIAS CURRENT (pA)
60
50
40
30
20
10
0
COMMON MODE RANGE (V)
100
BIAS CURRENT
10
OFFSET CURRENT
1
0
25
75
100
50
AMBIENT TEMPERATURE (°C)
125
Supply Current vs Temperature
200
RMS VOLTAGE NOISE DENSITY (nV/√Hz)
SUPPLY CURRENT PER AMPLIFIER (µA)
175
V
S
=
±15V
150
125
100
75
50
25 50 75
–75 –50 –25 0
TEMPERATURE (°C)
V
S
=
±5V
50
30
1/f CORNER = 9Hz
20
10
100 125
LT1464 • TPC04
NOISE VOLTAGE (2µV/DIV)
Voltage Gain vs Temperature
1.4k
1.2k
V
O
=
±10V,
V
S
=
±15V
V
O
=
±2V,
R
L
= 10k, V
S
=
±5V
V
O
=
±1V,
R
L
= 2k, V
S
=
±5V
R
L
= 10k, V
S
=
±15V
R
L
= 2k, V
S
=
±15V
SLEW RATE (V/µs)
1k
800
600
400
200
CHANNEL SEPARATION (dB)
VOLTAGE GAIN (V/mV)
0
–75 –50 –25
R
L
= 2k, V
S
=
±5V
R
L
= 10k, V
S
=
±5V
0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1464 • TPC07
U W
LT1464 • TPC01
Input Bias Current Over the
Common Mode Range
80
70
16
Common Mode Range vs
Temperature
15
14
13
12
V
S
=
±15V
T
A
= 25°C
–11
–12
–13
–14
–15
V
S
=
±15V
–75 –50 –25 0
25 50 75
TEMPERATURE (°C)
100 125
LT1464 • TPC03
–10
–15
–5
0
–10
5
10
COMMON MODE INPUT VOLTAGE (V)
15
LT1464 • TPC02
Voltage Noise vs Frequency
100
70
V
S
=
±15V
T
A
= 25°C
0.1Hz to 10Hz Noise
3
10
30
100 300 1k
FREQUENCY (Hz)
3k
10k
0
2
6
4
TIME (SEC)
8
10
LT1464 • TPC05
LT1464 • TPC06
Slew Rate, Gain Bandwidth
Product vs Temperature
1.75
SLEW FALL
1.5
Channel Separation vs Frequency
160
V
S
=
±15V
T
A
= 25°C
V
IN
= 10V
P-P
R
L
= 10k
1.50
1.3
140
GAIN BANDWIDTH (MHz)
1.25
GAIN BANDWIDTH
1.00
SLEW RISE
0.75
V
S
=
±15V
0.50
–75 –50 –25
1.1
120
0.9
100
0.7
80
0.5
0 25 50 75 100 125 150
TEMPERATURE (°C)
LT1464 • TPC08
60
10
100
10k
1k
FREQUENCY (Hz)
100k
1M
LT1464 • TPC09
5
嵌入式系统
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