LT1464/LT1465
Dual/Quad Micropower,
1MHz C-Load Picoampere
Bias Current JFET Input Op Amps
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FEATURES
DESCRIPTION
The LT®1464 (dual) and LT1465 (quad) are the first
micropower op amps (200µA max per amp) to offer
picoampereinputbiascurrents(500fAtyp)andunity-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.
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Input Bias Current:
2pA Max (LT1464A)
20pA Max (LT1464, LT1465)
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Supply Current per Amplifier: 200µA Max
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Gain Bandwidth Product: 1MHz Typ
Slew Rate: 0.9V/µs Typ
Input Common Mode Range Includes Positive Rail
Unity-Gain Stable for C-LoadTM 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
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In the design and testing of the LT1464/LT1465, particular
emphasis has been placed on optimizing performance in
thelowcostSO-8(dual)and14-leadSO(quad)packagefor
±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.
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APPLICATIONS
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Battery-Powered Systems
Photocurrent Amplifiers
Low Frequency, Micropower Active Filters
Low Droop Track-and-Hold Circuits
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, LTC and LT are registered trademarks of Linear Technology Corporation.
C-Load is a trademark of Linear Technology Corporation.
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TYPICAL APPLICATION
Micropower Low Droop Track-and-Hold/Peak Detector
+
V
1/4 LTC201 13
15
14
C1
Small-Signal Response, CLOAD = 10nF
10nF
16
A
POLYSTYRENE
1
MCT2
5
4
5
+
–
V
V
2
3
8
2
1
6
4
5
+
–
R1*
7
1
1/2 LT1464
1/2 LT1464
V
OUT
6
IN
B
MCT2
–
+
4
–
LT1464 • TA01
V
1/4 LTC201
2
3
1
0.5pA
10nF
2
6
4
TYPICAL DROOP =
= 0.05mV/s
1464 • TA02
TOTAL SUPPLY CURRENT = 46µ0A MAX
R1 = 60Ω0 FOR ±15V SUPPLIES
R1 = Ω0 FOR ±5V SUPPLIES
AV = 1
5
*
V
S = ±5V, ±15V
CL = 10nF
FUNCTION
Track-and-Hold
Positive Peak Detector Reset
Negative Peak Detector Reset
LTC201 switch is open for logic "1".
MODE
Track
IN A
0
0
IN B
0
0
MODE IN A
IN B
1
1
Hold
1
0
1
Store
Store
0
0
0
1