LT1462/LT1463
Dual/Quad Micropower,
260碌W C-Load Picoampere
Bias Current JFET Input Op Amps
FEATURES
s
DESCRIPTION
The LT
廬
1462 (dual) and LT1463 (quad) are the first
micropower op amps (45碌A(chǔ) 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
鹵15V
and
鹵5V
supplies. The input common mode range
includes the positive rail. Slew rate (0.08V/碌s 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
碌
A Max
Unity-Gain Stable for C-Load
TM
Up to 10nF
Input Common Mode Range Includes Positive Rail
Guaranteed Specs with
鹵5V, 鹵15V
Supplies
Gain Bandwidth Product: 175kHz Typ
Slew Rate: 0.13V/碌s 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
1碌F
R9
1M
DC
OUT C3
0.47碌F
7
C4
10碌F
8
AC
OUT
R3
10k
5
+
AMP 3
1/4 LT1463
PHOTODIODE
R2
24k
C2
200pF
+
3
鈥?/div>
R1
100鈩?/div>
5V
2
4
6
鈥?/div>
1/4 LT1463
11
鈥?V
R7
10M
R10
50k
10
+
1/4 LT1463
9
鈥?/div>
R11
1M
+
1/4 LT1463
14
13
鈥?/div>
R4
10M
D2
1N4148
R3
100k
INPUT
DC OUTPUT
CURRENT VOLTAGE OF AMP 3
10pA
鈥?.145V
100pA
鈥?.341V
1nA
鈥?.518V
10nA
鈥?.684V
100nA
鈥?.846V
1
碌A(chǔ)
鈥?.995V
10
碌A(chǔ)
鈥?.13V
100
碌A(chǔ)
鈥?.25V
1mA
鈥?.37V
R12
10k
1462 鈥?TA01
U
U
U
Small-Signal Response, C
L
= 10nF
A
V
= 1
V
S
=
鹵5V, 鹵15V
C
L
= 10nF
1462 鈥?TA02
1
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