1
LT1464/LT1465
Dual/Quad Micropower,
1MHz C-Load Picoampere
Bias Current JFET Input Op Amps
+
13
4
15
14
2
3
5
V
+
V
1/4 LTC201
1/4 LTC201
16
5
6
1
A
IN
B
7
R1*
1/2 LT1464
+
2
3
1
1/2 LT1464
1
2
1
2
5
4
5
4
6
6
8
4
V
+
V
C1
10nF
POLYSTYRENE
V
OUT
TYPICAL DROOP = = 0.05mV/s
TOTAL SUPPLY CURRENT = 460
A MAX
* R1 = 600
FOR
15V SUPPLIES
R1 = 0
FOR
5V SUPPLIES
0.5pA
10nF
LT1464 TA01
FUNCTION
MODE
IN A IN B
MODE IN A IN B
Track-and-Hold
Track
0
0
Hold
1
1
Positive Peak Detector Reset
0
0
Store
0
1
Negative Peak Detector Reset
0
0
Store
1
0
LTC201 switch is open for logic "1".
MCT2
MCT2
Small-Signal Response, C
LOAD
= 10nF
A
V
= 1
V
S
=
5V,
15V
C
L
= 10nF
TYPICAL APPLICATIO
N
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
C-Load is a trademark of Linear Technology Corporation.
1464 TA02
Micropower Low Droop Track-and-Hold/Peak Detector
s
Battery-Powered Systems
s
Photocurrent Amplifiers
s
Low Frequency, Micropower Active Filters
s
Low Droop Track-and-Hold Circuits
APPLICATIO
N
S
U
s
Input Bias Current:
2pA Max (LT1464A)
20pA Max (LT1464, LT1465)
s
Supply Current per Amplifier: 200
A Max
s
Gain Bandwidth Product: 1MHz Typ
s
Slew Rate: 0.9V/
s Typ
s
Input Common Mode Range Includes Positive Rail
s
Unity-Gain Stable for C-Load
TM
Up to 10nF
s
Open-Loop Gain: 1 Million Typ
s
Guaranteed Specs with
5V,
15V Supplies
s
Guaranteed Matching Specifications
s
Standard Pinout: SO-8, SO-14 Package
The LT
1464 (dual) and LT1465 (quad) are the first
micropower op amps (200
A 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/
s min) and gain
bandwidth product (650kHz min) are 100% tested. A full
set of matching specifications is also provided.
FEATURES
DESCRIPTIO
N
U
2
LT1464/LT1465
ABSOLUTE
M
AXI
M
U
M
RATINGS
W
W
W
U
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
ORDER PART
NUMBER
LT1464ACN8
LT1464ACS8
LT1464CN8
LT1464CS8
ORDER PART
NUMBER
LT1465CN
LT1465CS
TOP VIEW
S PACKAGE
14-LEAD PLASTIC SO
N PACKAGE
14-LEAD PDIP
1
2
3
4
5
6
7
14
13
12
11
10
9
8
OUT A
IN A
+IN A
V
+
+IN B
IN B
OUT B
OUT D
IN D
+IN D
V
+IN C
IN C
OUT C
A
B
D
C
T
JMAX
= 150
C,
JA
= 110
C/ W (N)
T
JMAX
= 150
C,
JA
= 150
C/ W (S)
Consult factory for Industrial and Military grade parts.
S8 PART MARKING
1
2
3
4
8
7
6
5
TOP VIEW
V
+
OUT B
IN B
+IN B
OUT A
IN A
+IN B
V
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
B
A
T
JMAX
= 150
C,
JA
= 130
C/ W (N)
T
JMAX
= 150
C,
JA
= 190
C/ W (S)
PACKAGE/ORDER I
N
FOR
M
ATIO
N
W
U
U
ELECTRICAL CHARACTERISTICS
V
S
=
15V, V
CM
= 0V, T
A
= 25
C, unless otherwise noted.
LT1464AC
LT1464C/LT1465C
SYMBOL
PARAMETER
CONDITIONS (Note 1)
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
V
S
=
5V
0.4
0.8
0.4
0.8
mV
V
S
=
15V
0.6
2.0
0.6
2.0
mV
I
OS
Input Offset Current
V
S
=
5V
0.2
1.2
pA
V
S
=
15V
0.5
2.0
0.5
15
pA
I
B
Input Bias Current
V
S
=
5V
0.4
2.0
pA
V
S
=
15V
0.5
3.0
0.5
20
pA
e
n
Input Noise Voltage
0.1Hz to 10Hz
2
2
V
P-P
Input Noise Voltage Density
f
O
= 10Hz
33
33
nV/
Hz
f
O
= 1000Hz
24
24
nV/
Hz
Input Noise Current Density
f
O
= 10Hz, 1kHz (Note 3)
0.4
0.4
fA/
Hz
CMRR
Common Mode Rejection Ratio
V
CM
= 12.5V to 15V
76
85
74
85
dB
PSRR
Power Supply Rejection Ratio
V
S
=
2.5V to
20V
81
90
78
90
dB
R
IN
Input Resistance--Differential
10
12
10
12
Common Mode
V
CM
= 12.5V to 8V
10
12
10
12
Common Mode
V
CM
= 8V to 15V
0
11
10
11
C
IN
Input Capacitance
3
3
pF
A
VOL
Large-Signal Voltage Gain
V
O
=
10V, R
L
= 10k
350
1000
300
900
V/mV
V
O
=
10V, R
L
= 2k
150
450
150
450
V/mV
V
S
=
5V, V
O
=
2V, R
L
= 10k
100
250
100
250
V/mV
V
S
=
5V, V
O
=
1V, R
L
= 2k
50
170
50
170
V/mV
1464A
1464
3
LT1464/LT1465
ELECTRICAL CHARACTERISTICS
V
S
=
15V, V
CM
= 0V, T
A
= 25
C, unless otherwise noted.
LT1464AC
LT1464C/LT1465C
SYMBOL
PARAMETER
CONDITIONS (Note 1)
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OUT
Output Voltage Swing
R
L
= 10k
13.5
13.7
13.5
13.7
V
R
L
= 2k
13.3
13.5
13.3
13.5
V
V
S
=
5V, R
L
= 2k
3.5
3.7
3.5
3.7
V
SR
Slew Rate
R
L
= 10k (Note 4)
0.5
0.9
0.5
0.9
V/
s
GBW
Gain Bandwidth Product
f = 10kHz
650
1000
650
1000
kHz
I
S
Supply Current per Amplifier
145
200
145
200
A
V
S
=
5V
135
200
135
200
A
Channel Separation
f = 10Hz, V
O
=
10V, R
L
= 10k
132
132
dB
V
OS
Offset Voltage Match (Note 7)
V
S
=
5V
0.5
1.3
0.5
1.3
mV
V
S
=
15V
0.8
3.3
0.8
3.3
mV
I
B
+
Noninverting Bias Current Match
V
S
=
5V
0.4
3.0
pA
(Note 7)
V
S
=
15V
0.5
4.0
0.5
30
pA
CMRR
Common Mode Rejection Match
(Notes 5, 7)
74
85
71
85
dB
PSRR
Power Supply Rejection Match
(Notes 5, 7)
78
88
74
88
dB
V
S
=
15V, V
CM
= 0V, 0
C
T
A
70
C, unless otherwise noted.
LT1464AC
LT1464C/LT1465C
SYMBOL
PARAMETER
CONDITIONS (Note 1)
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
V
S
=
5V
q
0.5
1.4
0.5
1.4
mV
V
S
=
15V
q
0.9
2.8
0.9
2.8
mV
V
OS
Average Input Offset Voltage Drift
(Note 6)
q
7
20
7
20
V/
C
Temp
I
OS
Input Offset Current
q
10
50
25
450
pA
I
B
Input Bias Current
q
60
150
150
750
pA
CMRR
Common Mode Rejection Ratio
V
CM
= 12V to 15V
q
75
85
73
85
dB
PSRR
Power Supply Rejection Ratio
V
S
=
3V to
20V
q
80
89
77
89
dB
A
VOL
Large-Signal Voltage Gain
V
O
=
10V, R
L
= 10k
q
200
600
200
600
V/mV
V
O
=
10V, R
L
= 2k
q
100
350
100
350
V/mV
V
S
=
5V, V
O
=
2V, R
L
= 10k
q
80
200
80
200
V/mV
V
S
=
5V, V
O
=
1V, R
L
= 2k
q
45
150
45
150
V/mV
V
OUT
Output Voltage Swing
R
L
= 10k
q
13.4
13.6
13.4
13.6
V
R
L
= 2k
q
13.2
13.4
13.2
13.4
V
V
S
=
5V, R
L
= 2k
q
3.4
3.6
3.4
3.6
V
SR
Slew Rate
R
L
= 10k (Note 4)
q
0.4
0.8
0.4
0.8
V/
s
GBW
Gain Bandwidth Product
f = 10kHz
q
540
870
540
870
kHz
I
S
Supply Current per Amplifier
q
160
220
160
220
A
V
S
=
5V
q
150
220
150
220
A
V
OS
Offset Voltage Match (Note 7)
V
S
=
5V
q
0.7
2.0
0.7
2.0
mV
V
S
=
15V
q
0.9
3.5
0.9
3.5
mV
I
B
+
Noninverting Bias Current Match
q
5
40
35
500
pA
(Note 7)
4
LT1464/LT1465
ELECTRICAL CHARACTERISTICS
V
S
=
15V, V
CM
= 0V, 0
C
T
A
70
C, unless otherwise noted.
LT1464AC
LT1464C/LT1465C
SYMBOL
PARAMETER
CONDITIONS (Note 1)
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
CMRR
Common Mode Rejection Match
(Notes 5, 7)
q
73
84
70
84
dB
PSRR
Power Supply Rejection Match
(Notes 5, 7)
q
77
85
73
85
dB
V
S
=
15V, V
CM
= 0V, 40
C
T
A
85
C (Note 2), unless otherwise noted.
LT1464AC
LT1464C/LT1465C
SYMBOL
PARAMETER
CONDITIONS (Note 1)
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
V
S
=
5V
q
0.6
1.5
0.6
1.5
mV
V
S
=
15V
q
1.0
3.0
1.0
3.0
mV
V
OS
Average Input Offset Voltage Drift
(Note 6)
q
7
20
7
20
V/
C
Temp
I
OS
Input Offset Current
q
40
150
60
700
pA
I
B
Input Bias Current
q
200
500
300
2500
pA
CMRR
Common Mode Rejection Ratio
V
CM
= 12V to 15V
q
74
84
72
84
dB
PSRR
Power Supply Rejection Ratio
V
S
=
3V to
20V
q
79
88
76
88
dB
A
VOL
Large-Signal Voltage Gain
V
O
=
10V, R
L
= 10k
q
175
400
175
400
V/mV
V
O
=
10V, R
L
= 2k
q
80
250
80
250
V/mV
V
S
=
5V, V
O
=
2V, R
L
= 10k
q
70
180
70
180
V/mV
V
S
=
5V, V
O
=
1V, R
L
= 2k
q
45
140
45
140
V/mV
V
OUT
Output Voltage Swing
R
L
= 10k
q
13.2
13.4
13.2
13.4
V
R
L
= 2k
q
13.0
13.2
13.0
13.2
V
V
S
=
5V, R
L
= 2k
q
3.2
3.4
3.2
3.4
V
SR
Slew Rate
R
L
= 10k (Note 4)
q
0.35
0.7
0.35
0.7
V/
s
GBW
Gain Bandwidth Product
f = 10kHz
q
510
850
510
850
kHz
I
S
Supply Current per Amplifier
q
165
230
165
230
A
V
S
=
5V
q
160
230
160
230
A
V
OS
Offset Voltage Match (Note 7)
V
S
=
5V
q
0.8
2.5
0.8
2.5
mV
V
S
=
15V
q
1.0
4.0
1.0
4.0
mV
I
B
+
Noninverting Bias Current Match
q
20
100
70
800
pA
(Note 7)
CMRR
Common Mode Rejection Match
(Notes 5, 7)
q
72
83
69
83
dB
PSRR
Power Supply Rejection Match
(Notes 5, 7)
q
76
81
73
81
dB
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 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
V/V on the individual amplifiers.
2. The difference is calculated between the matching sides in
V/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.
5
LT1464/LT1465
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
Input Bias and Offset Current vs
Temperature
AMBIENT TEMPERATURE (
C)
0
INPUT BIAS AND OFFSET CURRENT (pA)
100
LT1464 TPC01
25
50
75
125
10000
1000
100
10
1
LT1464/LT1465
LT1464A
OFFSET CURRENT
BIAS CURRENT
Common Mode Range vs
Temperature
TEMPERATURE (
C)
75 50
0
50
100
COMMON MODE RANGE (V)
16
15
14
13
12
11
12
13
14
15
25
25
LT1464 TPC03
75
125
V
S
=
15V
Supply Current vs Temperature
0.1Hz to 10Hz Noise
TEMPERATURE (
C)
75
SUPPLY CURRENT PER AMPLIFIER (
A)
25
25
75
125
LT1464 TPC04
200
175
150
125
100
75
50
50
0
50
100
V
S
=
5V
V
S
=
15V
TIME (SEC)
0
NOISE VOLTAGE (2
V/DIV)
8
LT1464 TPC06
2
4
6
10
Voltage Gain vs Temperature
Channel Separation vs Frequency
TEMPERATURE (
C)
75
VOLTAGE GAIN (V/mV)
25
1.4k
1.2k
1k
800
600
400
200
0
LT1464 TPC07
25
75
50
50
0
100 125 150
R
L
= 10k, V
S
=
15V
R
L
= 2k, V
S
=
15V
R
L
= 2k, V
S
=
5V
R
L
= 10k, V
S
=
5V
V
O
=
10V, V
S
=
15V
V
O
=
2V, R
L
= 10k, V
S
=
5V
V
O
=
1V, R
L
= 2k, V
S
=
5V
FREQUENCY (Hz)
10
CHANNEL SEPARATION (dB)
160
140
120
100
80
60
100k
LT1464 TPC09
100
1k
10k
1M
V
S
=
15V
T
A
= 25
C
V
IN
= 10V
P-P
R
L
= 10k
Input Bias Current Over the
Common Mode Range
COMMON MODE INPUT VOLTAGE (V)
15
10
INPUT BIAS CURRENT (pA)
5
10
80
70
60
50
40
30
20
10
0
10
LT1464 TPC02
5
0
15
V
S
=
15V
T
A
= 25
C
Voltage Noise vs Frequency
Slew Rate, Gain Bandwidth
Product vs Temperature
TEMPERATURE (
C)
75
SLEW RATE (V/
s)
GAIN BANDWIDTH (MHz)
1.75
1.50
1.25
1.00
0.75
0.50
1.5
1.3
1.1
0.9
0.7
0.5
25
25
50
150
LT1464 TPC08
50
0
75 100 125
SLEW FALL
SLEW RISE
GAIN BANDWIDTH
V
S
=
15V
FREQUENCY (Hz)
3
RMS VOLTAGE NOISE DENSITY (nV/
Hz)
100
70
50
30
20
10
30
10k
LT1464 TPC05
10
100
300
1k
3k
V
S
=
15V
T
A
= 25
C
1/f CORNER = 9Hz
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