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PDF LT1490 Data sheet ( Hoja de datos )
| Número de pieza | LT1490 | |
| Descripción | Dual and Quad Micropower Rail-to-Rail Input and Output Op Amps | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT1490 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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LT1490/LT1491
Dual and Quad
Micropower Rail-to-Rail
Input and Output Op Amps
FEATURES
s Rail-to-Rail Input and Output
s Single Supply Input Range: – 0.4V to 44V
s Micropower: 50µA/Amplifier Max
s Specified on 3V, 5V and ±15V Supplies
s High Output Current: 20mA
s Output Drives 10,000pF with Output Compensation
s Reverse Battery Protection to 18V
s No Supply Sequencing Problems
s High Voltage Gain: 1500V/mV
s High CMRR: 98dB
s No Phase Reversal
s Gain Bandwidth Product: 200kHz
U
APPLICATIONS
s Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
s Supply Current Sensing
s Battery Monitoring
s Micropower Active Filters
s 4mA to 20mA Transmitters
DESCRIPTION
The dual LT®1490 and quad LT1491 op amps operate on all
single and split supplies with a total voltage of 2V to 44V
drawing only 40µA of quiescent current per amplifier. These
amplifiers are reverse supply protected; they draw no current
for reverse supply up to 18V. The input range of the LT1490/
LT1491 includes both supplies and the output swings to both
supplies. Unlike most micropower op amps, the LT1490/
LT1491 can drive heavy loads; their rail-to-rail outputs drive
20mA. The LT1490/LT1491 are unity-gain stable and drive all
capacitive loads up to 10,000pF when optional 0.22µF and
150Ω compensation is used.
The LT1490/LT1491 have a unique input stage that oper-
ates and remains high impedance when above the positive
supply. The inputs take 44V both differential and common
mode even when operating on a 3V supply. Built-in resis-
tors protect the inputs for faults below the negative supply
up to 22V. There is no phase reversal of the output for inputs
22V below V – or 44V above V–, independent of V +.
The LT1490 dual op amp is available in the 8-pin SO and
PDIP packages. The quad LT1491 is available in the 14-pin
SO and PDIP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
CHARGER
VOLTAGE
RS
0.2Ω
IBATT
RA
2k
RA'
2k
Battery Monitor
+
A
1/4 LT1491
–
Q1
2N3904
LOAD
RB
2k
RB'
2k
+
VBATT = 12V
+
B
1/4 LT1491
–
Q2
2N3904
S1
RG
10k
10k
–
C
1/4 LT1491
+
LOGIC
LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING
+
D
1/4 LT1491
–
90.9k
VOUT
IBATT
=
VOUT
=
(RS)(RG/RA)(GAIN)
VOUT AMPS
GAIN
S1 = OPEN, GAIN = 1
S1 = CLOSED, GAIN = 10
RA = RB
VS = 5V, 0V
1490/91 TA01
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
80
70
TA = 125°C
60
TA = 25°C
50
40 TA = –55°C
30
20
10
0
0 5 10 15 20 25 30 35 40 45
TOTAL SUPPLY VOLTAGE (V)
1490/91 G01
Output Saturation Voltage
vs Load Current (Output High)
1
VS = ± 2.5V
VOD = 30mV
Minimum Supply Voltage
400
300
200
100
0
– 100
TA = 25°C
TA = –55°C
– 200
–300 TA = 125°C
– 400
0
1 234
TOTAL SUPPLY VOLTAGE (V)
5
1490/91 G02
Output Saturation Voltage
vs Load Current (Output Low)
1
VS = ± 2.5V
VOD = 30mV
TA = 125°C
0.1
TA = 25°C
TA = – 55°C
0.01
0.001
0.01 0.1
1
SOURCING LOAD CURRENT (mA)
10
1490/90 G04
0.1Hz to 10Hz Noise Voltage
VS = ±2.5V
0 1 2 3 4 5 6 7 8 9 10
TIME (SEC)
1490 G07
TA = 125°C
0.1 TA = 25°C
TA = – 55°C
0.01
0.001
0.01 0.1
1
SINKING LOAD CURRENT (mA)
10
1490/90 G05
Noise Voltage Density
vs Frequency
80
70
60
50
40
30
1
10 100
FREQUENCY (Hz)
1k
1490/91 G08
LT1490/LT1491
Input Bias Current
vs Common Mode Voltage
6000
VS = 5V, 0V
4000
2000
30 TA = –55°C
20
10
0
–10
4.0
TA = 25°C
TA = 125°C
4.4 4.8 5.2 5.6
COMMON MODE VOLTAGE (V)
44
1490/91 G03
Output Saturation Voltage
vs Input Overdrive
100
VS = ± 2.5V
90 NO LOAD
80
70
60
50
40
30
OUTPUT HIGH
20
10 OUTPUT LOW
0
0 10 20 30 40 50 60 70 80 90 100
INPUT OVERDRIVE (mV)
1490/91 G06
Input Noise Current vs Frequency
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
1 10 100 1k
FREQUENCY (Hz)
1490/91 G09
5
5 Page 
LT1490/LT1491
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
N Package
14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770*
(19.558)
MAX
14 13 12 11 10
9
8
0.255 ± 0.015*
(6.477 ± 0.381)
0.300 – 0.325
(7.620 – 8.255)
0.130 ± 0.005
(3.302 ± 0.127)
1 234 56 7
0.045 – 0.065
(1.143 – 1.651)
0.009 – 0.015
(0.229 – 0.381)
0.015
(0.380)
MIN
+0.025
0.325 –0.015
( )8.255
+0.635
–0.381
0.125
(3.175)
MIN
0.005
(0.125)
MIN
0.100 ± 0.010
(2.540 ± 0.254)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.065
(1.651)
TYP
0.018 ± 0.003
(0.457 ± 0.076)
N14 0695
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 – 0.344*
(8.560 – 8.738)
14 13 12 11 10
9
8
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
1234567
0° – 8° TYP
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.050
(1.270)
TYP
S14 0695
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1490.PDF ] | |
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