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PDF LT1494 Data sheet ( Hoja de datos )
| Número de pieza | LT1494 | |
| Descripción | Rail-to-Rail Input and Output Op Amps | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT1494/LT1495/LT1496
1.5µA Max, Single, Dual
and Quad Over-The-Top Precision
Rail-to-Rail Input and Output Op Amps
FEATURES
s Low Supply Current: 1.5µA Max
s Rail-to-Rail Input and Output
s Low Offset Voltage: 375µV Max
s Operating Temperature Range: – 40°C to 125°C
s Over-The-TopTM Inputs Operate Above V+
s Wide Supply Range: 2.2V to 36V
s Single Supply Input Range: – 0.3V to 36V
s Low Input Bias Current: 250pA
s Low Input Offset Current: 20pA
s High AVOL: 100V/mV Minimum Driving 100kΩ Load
s Output Sources and Sinks 500µA Load Current
s Reverse Battery Protected to 18V
U
APPLICATIO S
s Battery- or Solar-Powered Systems
s Portable Instrumentation
s Remote Sensor Amplifier
s Micropower Filter
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
DESCRIPTIO
The LT®1494/LT1495/LT1496 are the lowest power
(IS ≤ 1.5µA) op amps with precision specifications. The
extremely low supply current is combined with excellent
amplifier specifications: input offset voltage is 375µV
maximum with a typical drift of only 0.4µV/°C, input offset
current is 100pA maximum. A minimum open-loop gain
(AVOL) of 100V/mV ensures that gain errors are small. The
device characteristics 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 LT1494/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 4µVP-P is
remarkably low considering the low supply current.
The LT1494 is available in the 8-Pin MSOP, PDIP and SO
packages.The LT1495 is available in plastic 8-Pin PDIP
and SO packages with the standard dual op amp pinout.
The LT1496 is available in 14-Pin SO and PDIP packages.
TYPICAL APPLICATION
Micropower Integrating Current Sense
RESET
VCC RI
1M
RS
0.1Ω 1M
IL
0.1µF
–
1/2 LT1495
+
LOAD
10M
VCC
200k
–
1/2 LT1495
+
10M
VO
1495 TA01
( )OUTPUT SWITCHES
WHEN ILdt = 0.98 VCC
RI
RS
C = (4.9A)(SEC) FOR VCC = 5V
IS = 3µA DURING INTEGRATION; IS = 5µA END OF INTEGRATION
TC VOS Distribution
30
100 AMPLIFIERS
25
VS = ±2.5V
–40°C TO 85°C
20
15
10
5
0
– 2.0 –1.6 –1.2 –0.8 –0.4 0 0.4 0.8 1.2 1.6 2.0
TC VOS (µV/°C)
1495 TA02
1
1 page  
LT1494/LT1495/LT1496
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the temperature range of – 40°C ≤ TA ≤ 125°C. VS = 5V, 0V; VS = 3V, 0V; VCM = VO =
half supply, unless otherwise noted. (Note 3)
SYMBOL
VOS
VOS TC
IB
IOS
AVOL
CMRR
PSRR
VOL
VOH
IS
PARAMETER
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
Large-Signal Voltage Gain
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Minimum Operating Supply Voltage
Output Voltage Swing LOW
Output Voltage Swing HIGH
Supply Current per Amplifier
CONDITIONS
VS = 5V
VS = 3V
(Note 4)
(Note 5)
VCM = 10V (Note 6)
(Note 5)
VS = 5V, VO = 0.25V to 4.5V, RL = 100k
VS = 3V, VO = 0.25V to 2.5V, RL = 100k
VCM = 0.5V to 4V, VS = 5V
VCM = 0.5V to 10V, VS = 5V
VS = 2.7V to 12V, VCM = VO = 0.5V
No Load
ISINK = 100µA
No Load
ISOURCE = 100µA
(Note 6)
LT1494H/LT1495H/LT1496H
MIN TYP MAX
q 225 875
q 275 975
q 0.4 3
q 3.8 10
q
0.300
2
q 0.3 2
q4
q2
25
17
q 0.5
36
q 72
q
95
85
q 86
105
q 2.7
q
q
q V+ – 140
q V+ – 450
70
275
V+ – 45
V+ – 225
160
550
q 25
UNITS
µV
µV
µV/°C
nA
µA
nA
V/mV
V/mV
V
dB
dB
dB
V
mV
mV
mV
mV
µA
TA = 25°C, VS = ±15V, VCM = VO = 0V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
VOS Input Offset Voltage
MS8 Package
IB Input Bias Current
IOS Input Offset Current
AVOL Large-Signal Voltage Gain
Input Voltage Range
VO = ±10V, RL = 100k
CMRR
PSRR
VOL
VOH
ISC
IS
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Output Voltage Swing LOW
Output Voltage Swing HIGH
Short-Circuit Current
Supply Current per Amplifier
VCM = – 15V to 14V
VS = ±5V to ±15V
RL = 1M
RL = 100k
RL = 1M
RL = 100k
MIN
100
– 15
100
96
14.78
14.62
0.7
TYP
200
200
25
20
360
120
120
–14.85
–14.75
14.89
14.81
1.5
1.4
MAX
575
675
1000
100
21
–14.70
–14.50
2.0
UNITS
µV
µV
pA
pA
V/mV
V
dB
dB
V
V
V
V
mA
µA
5
5 Page 
APPLICATIONS INFORMATION
V+
D1 D2
Q10
IN +
LT1494/LT1495/LT1496
D3
Q13
Q14
C1
D7
Q15
+
I1
Q20
Q21
OUT
IN –
Q1 Q2
Q3 Q4
Q7 (V +) – 0.8V Q16
Q17
Q5 Q6
0.5 0.5
0.5 0.5
Q11 Q12
D4
D5
D6
Q9 Q8
+
R1 R2 I2
Q19
Q18
Q22
1495 F03
Figure 3. Simplified Schematic
The input stage is formed by two diff amps Q1-Q2 and Q3-
Q6. For signals with a common mode voltage between VEE
and (VCC – 0.8V), Q1 and Q2 are active. When the input
common mode exceeds (VCC – 0.8V), Q7 turns on,
diverting the current from diff amp Q1-Q2 to current
mirror Q8-Q9. The current from Q8 biases on the other diff
amp consisting of PNP’s Q5-Q6 and NPN’s Q3-Q4. Though
Q5-Q6 are driven from the emitters rather than the base,
the basic diff amp action is the same. When the common
mode voltage is between (VCC – 0.8V) and VCC, devices Q3
and Q4 act as followers, forming a buffer between the
amplifier inputs and the emitters of the Q5-Q6. If the
common mode voltage is taken above VCC, Schottky
diodes D1 and D2 reverse bias and devices Q3 and Q4 then
act as diodes. The diff amp formed by Q5-Q6 operates
normally, however, the input bias current increases to the
emitter current of Q5-Q6, which is typically 180nA. The
graph, Input Bias Current vs Common Mode Voltage
found in the Typical Performance Characteristics section,
shows these transitions at three temperatures.
The collector currents of the two-input pairs are combined
in the second stage consisting of Q11 to Q16, which
furnishes most of the voltage gain. Capacitor C1 sets the
amplifier bandwidth. The output stage is configured for
maximum swing by the use of common emitter output
devices Q21 and Q22. Diodes D4 to D6 and current source
Q15 set the output quiescent current.
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT1494.PDF ] | |
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