LT1495 Linear Technology, LT1495 Datasheet

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LT1495

Manufacturer Part Number
LT1495
Description
1.5uA Max/ Dual and Quad Precision Rail-to-Rail Input and Output Op Amps
Manufacturer
Linear Technology
Datasheet

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0
FEATURES
APPLICATIONS
TYPICAL
Low Supply Current: 1.5 A Max
Rail-to-Rail Input and Output
Low Offset Voltage: 375 V Max
Wide Supply Range: 2.2V to 36V
Single Supply Input Range: – 0.3V to 36V
Low Input Bias Current: 250pA
Low Input Offset Current: 20pA
High A
Output Sources and Sinks 500 A Load Current
Reverse Battery Protected to 18V
Battery- or Solar-Powered Systems
Portable Instrumentation
Remote Sensor Amplifier
Micropower Filter
LOAD
V
CC
VOL
R
0.1
I
S
L
OUTPUT SWITCHES
WHEN I
I
: 100V/mV Minimum Driving 100k Load
S
= 3 A DURING INTEGRATION; I
APPLICATION
1M
1M
Micropower Integrating Current Sense
R
V
I
CC
L
dt = 0.98 V
U
10M
+
1/2 LT1495
CC
RESET
0.1 F
200k
R
R
I
S
C = (4.9A)(SEC) FOR V
S
U
10M
= 5 A END OF INTEGRATION
+
1/2 LT1495
CC
= 5V
1495 TA01
V
O
DESCRIPTION
The LT
amps with precision specifications. The extremely low
supply current is combined with excellent amplifier speci-
fications: input offset voltage is 375 V maximum with a
typical drift of only 0.4 V/ C, input offset current is 100pA
maximum. A minimum open-loop gain (A
ensures that gain errors are small. The device character-
istics change little over the supply range of 2.2V to 15V.
Supply rejection is 90dB and the common mode rejection
ratio is 90dB. Operation is specified for 3V, 5V and 15V
supplies. Reverse battery protection (–18V min) and
inputs that operate above the positive supply make the
LT1495/LT1496 easy to use in harsh environments.
The low bias currents and offset current of the amplifier
permit the use of megohm level source resistors without
introducing significant errors. Voltage noise at 4 V
remarkably low considering the low supply current.
The LT1495 is available in plastic 8-pin PDIP and SO-8
packages with the standard dual op amp pinout. The
LT1496 is available in 14-pin SO and PDIP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
1.5 A Max, Dual and Quad
Input and Output Op Amps
®
1495/LT1496 are the lowest power (I
30
25
20
15
10
5
0
– 2.0
100 AMPLIFIERS
V
–40 C TO 85 C
–1.6
S
Precision Rail-to-Rail
= 2.5V
U
–1.2
TC V
–0.8
OS
TC V
–0.4
Distribution
OS
0
LT1495/LT1496
( V/ C)
0.4
0.8
1.2
VOL
1495 TA02
1.6
S
) of 100V/mV
2.0
1.5 A) op
P-P
1
is

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LT1495 Summary of contents

Page 1

... Voltage noise remarkably low considering the low supply current. The LT1495 is available in plastic 8-pin PDIP and SO-8 packages with the standard dual op amp pinout. The LT1496 is available in 14-pin SO and PDIP packages. ...

Page 2

... RATINGS Specified Temperature Range (Note 1) ... – Storage Temperature Range ................. – 150 C Junction Temperature ........................................... 150 C Lead Temperature (Soldering, 10 sec).................. 300 ORDER PART NUMBER 1 OUT A LT1495CN8 2 –IN A LT1495CS8 – PART MARKING 7 OUT B 1495 N PACKAGE ...

Page 3

... V = 0.25V to 4.5V 100k 3V 0.25V to 2.5V 100k 0. 0.2V to 10V 2.7V to 12V 0. LT1495/LT1496 MIN TYP MAX + + V – 0.07 V – 0.035 + + V – 0.32 V – 0.160 0.7 1.3 1.0 1.5 –18 0.4 1.0 2.7 MIN TYP MAX 175 425 225 525 ...

Page 4

... LT1495/LT1496 ELECTRICAL CHARACTERISTICS – 5V, 0V 3V, 0V SYMBOL PARAMETER V Output Voltage Swing LOW OL V Output Voltage Swing HIGH OH I Short-Circuit Current SC I Supply Current per Amplifier 15V 0V, unless otherwise noted SYMBOL PARAMETER ...

Page 5

... Supply Current per Amplifier S The denotes specifications which apply over the full operating temperature range. Note 1: The LT1495/LT1496 are designed, characterized and expected to meet these extended temperature limits, but are not tested at – and 85 C. Guaranteed I grade parts are available; consult factory ...

Page 6

... LT1495/LT1496 W U TYPICAL PERFORMANCE CHARACTERISTICS Output Saturation Voltage vs Load Current (Output Low) 1000 100 – 0 100 1000 LOAD CURRENT ( A) 1495 G04 Gain and Phase Shift vs Frequency 2. PHASE 20 10 GAIN 0 –10 – ...

Page 7

... OUTPUT VOLTAGE (V) 1495 G17 Small-Signal Response 1495 G20 100pF L LT1495/LT1496 Output Impedance vs Frequency 1000 100 0.1 0.01 0 FREQUENCY (kHz) 1495 G15 Open-Loop Gain V = 15V 15V ...

Page 8

... In the worst case, there may not be enough supply current available to take the system up to nominal voltages. Figure graph of LT1495 supply current vs supply voltage for the three limit cases of input offset that could occur during start-up. The circuits are shown in Figure 2. One circuit creates a positive offset, forcing the output to come up saturated high ...

Page 9

... Capacitor C1 sets the , devices Q3 CC amplifier bandwidth. The output stage is configured for maximum swing by the use of common emitter output devices Q21 and Q22. Diodes and current source , Schottky CC Q15 set the output quiescent current. LT1495/LT1496 D7 Q15 Q20 + I 1 Q21 C1 ...

Page 10

... F SUPPLY CURRENT = 6.2 A QUIESCENT – 10kHz LINEARITY: 0.03% PSRR (4.4V TO 36V): 10ppm/V TEMPERATURE DRIFT: 250ppm 0 – 1/2 OUTPUT LT1495 + 10M 10k GAIN: 1000 OFFSET DRIFT: 50nV/ C SUPPLY CURRENT: 5.5 A BANDWIDTH: 0.2Hz CLOCK RATE: 4Hz CD4016 QUAD 1495 TA08 1495 TA07 ...

Page 11

... MIN 0.100 0.010 (2.540 0.254) S Package 14-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.004 – 0.010 (0.101 – 0.254) 0.228 – 0.244 (5.791 – 6.197) 0.050 (1.270) TYP LT1495/LT1496 0.400* (10.160) MAX 0.255 0.015* (6.477 0.381 ...

Page 12

... A 1495 TA06 Filter Frequency Response 0 –10 –20 –30 –40 –50 – 100 1000 FREQUENCY (Hz) LT1495/96 • TA04 , Gain Bandwidth = 120kHz , Gain Bandwidth = 200kHz , Gain Bandwidth = 200kHz , Gain Bandwidth = 60kHz 14956f LT/TP 0697 5K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1997 = 0 IN ...

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