LT1465_15 Datasheet, PDF (1/12 Pages) Linear Technology – Dual/Quad Micropower, 1MHz C-Load Picoampere Bias Current JFET Input Op Amps

LT1464/LT1465
Dual/Quad Micropower,
1MHz C-Load Picoampere
Bias Current JFET Input Op Amps
FEATURES
s _{Input Bias Current:}
2pA Max (LT1464A)
20pA Max (LT1464, LT1465)
s _{Supply Current per Amplifier: 200µA Max}
s _{Gain Bandwidth Product: 1MHz Typ}
s _{Slew Rate: 0.9V/µs 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}
U
APPLICATIONS
s _{Battery-Powered Systems}
s _{Photocurrent Amplifiers}
s _{Low Frequency, Micropower Active Filters}
s _{Low Droop Track-and-Hold Circuits}
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.
TYPICAL APPLICATION
Micropower Low Droop Track-and-Hold/Peak Detector
V⁺
1/4 LTC201 13 15
A ¹⁶
4 14
V^–
1 MCT2 5
5₊
26
4
7 ^R1*
1/2 LT1464
IN
6_–
1 MCT2 5
1/4 LTC201
2
B
1
26
4
5
3
C1
10nF
POLYSTYRENE
V⁺
2_–
8
1
1/2 LT1464
3₊
4
V^–
V_OUT
LT1464 • TA01
TYPICAL DROOP = ^0.5pA = 0.05mV/s
10nF
TOTAL SUPPLY CURRENT = 460 µA MAX
* R1 = 600 Ω FOR ±15V SUPPLIES
R1 = 0 Ω FOR ±5V SUPPLIES
FUNCTION
MODE
Track-and-Hold
Track
Positive Peak Detector Reset
Negative Peak Detector Reset
LTC201 switch is open for logic "1".
IN A IN B MODE IN A IN B
0 0 Hold 1 1
0 0 Store 0 1
0 0 Store 1 0
Small-Signal Response, C_LOAD = 10nF
A_V = 1
V_S = ±5V, ±15V
C_L = 10nF
1464 • TA02
1