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PDF LTC1541 Data sheet ( Hoja de datos )
| Número de pieza | LTC1541 | |
| Descripción | Micropower Op Amp/ Comparator and Reference | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1541/LTC1542
Micropower Op Amp,
Comparator and Reference
FEATURES
s Quiescent Current: 5µA Typ
s Outputs Swing Rail-to-Rail
s Low Op Amp Offset Voltage: 700µV Max
s Reference Output Drives 0.01µF Capacitor
s Internal 1.2V ±0.4% Reference Output (LTC1541)
s Low Input Bias Current: 1nA Max
s Reference Output Can Source Up to 2mA
s Internal ±3mV Comparator Hysteresis
s Comparator and Op Amp Input Range
Includes Ground
s Op Amp Capable of Driving Up to 1000pF Load
s Unity-Gain Stable and 12kHz Bandwidth
s 2.5V to 12.6V SupDpalyisyV-oClhtaaigneedRCaonngtreol Outputs
s Pin Compatible Upgrade for MAX951/MAX953
U
APPLICATIONS
s Battery- or Solar-Powered Systems
s Automotive Keyless Entry
s Low Frequency, Local Area Alarms/Detectors
s Infrared Receivers for Remote Controls
s Smoke Detectors and Safety Sensors
s GSM Portable Phones
DESCRIPTION
The LTC®1541/LTC1542 combine a micropower ampli-
fier, comparator and bandgap reference (LTC1541) in an
8-pin package. The part operates from a single 2.5V to
12.6V or dual ±1.25V to ±6.3V supply with a typical supply
current of 5µA. Both the op amp and comparator feature
a common mode input voltage range that extends from the
negative supply to within 1.3V of the positive supply. The
op amp output stage swings from rail-to-rail. The
comparator’s inverting input is internally connected to the
reference output (LTC1541).
The reference output voltage is 1.2V ±1% over the
extended temperature range. The output can drive a
bypass capacitor of up to 0.01µF without any oscillations.
It can also source up to 2mA and sink up to 20µA.
The op amp is internally compensated to be unity-gain
stable with typical GBW at 12kHz and slew rate of 8V/ms.
The comparator has ±3mV of internal hysteresis to ensure
clean output switching, even with slow moving input
signals.
The LTC1541/LTC1542 are available in MSOP and SO-8
packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Pilot Light Flame Detector with Low-Battery Lockout
TYPE R
1N457
10M
VIN = 3.6V TO 9V
1k 100k
–+
10k 1N457
ICC = 7µA AT VIN = 5V
3+ 8
2.2µF 1/2 LTC1541 1
2–
2M
1M
2M
10k
OUTPUT HIGH = “ON”
OUTPUT LOW = “OFF”
2N3904
5+
1/2 LTC1541
6–
SCR LOAD
7 LOW BATTERY
1.2V INTERNAL
REFERENCE
VN2222
1541/42 • TA01
Op Amp VOS Distribution,
VCM = 2.5V, SO-8 Package
Total of 839 Units
50
VCC = 5V
VSS = 0V
40
30
20
10
0
–600
–300
0
300
INPUT OFFSET VOLTAGE (µV)
600
1541/42 TA02
1
1 page  
LTC1541/LTC1542
ELECTRICAL CHARACTERISTICS VCC = 3V, VSS = 0V, TA = 25°C, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Op Amp
VOS Input Offset Voltage
VCM = 1.5V (SO-8)
Commercial Grade (SO-8)
Industrial Grade (SO-8)
0.70 mV
q 1.25 mV
q 1.65 mV
VCM = 1.5V (MSOP)
1.00 mV
q 1.75 mV
IB Input Bias Current
AVOL Large-Signal Gain
VCM = 1.5V
AMPOUT = 0.5V to 2.5V, No Load
AMPOUT = 0.5V to 2.5V, RLOAD = 100k
Commercial Grade
Industrial Grade
q 0.01
80.0 1000
45.5 500
q 22.0
q 20.0
1
nA
V/mV
V/mV
V/mV
V/mV
GBW
SR
VCM
CMRR
Gain Bandwidth
Slew Rate
Input Common Mode Range
Common Mode Rejection Ratio
AV = 1V/V
AV = 1V/V
VCM = VSS to (VCC – 1.3V)
Commercial Grade
Industrial Grade
q VSS
q
q
12 kHz
8 V/ms
VCC – 1.3
0.40
0.50
1.00
V
mV/V
mV/V
mV/V
PSRR
Power Supply Rejection Ratio
VCC = 3V to 12V
Commercial Grade
Industrial Grade
0.19 mV/V
q 0.21 mV/V
q 0.23 mV/V
VOH Output High Voltage
VOL Output Low Voltage
ISOURCE
Output Source Current
RLOAD = 100k to VSS
Commercial Grade
Industrial Grade
RLOAD = 100k to VCC
Commercial Grade
Industrial Grade
VCC – 0.07
q VCC – 0.10
q VCC – 0.12
VCC + 0.05
q VCC + 0.10
q VCC + 0.12
0.6 0.95
q 0.4
V
V
V
V
V
V
mA
mA
ISINK Output Sink Current
1.2 1.8
q 0.8
mA
mA
en Input Noise Voltage
fO = 0.1Hz to 10Hz
3 µVP-P
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Supply current is tested with COMPIN+ = (REF – 100mV) for
LTC1541 and COMPIN+ = 0V, COMPIN– = 100mV for LTC1542.
Note 2: Input offset voltage is defined as the center of the input referred
hysteresis, VCM = REF (LTC1541). VCM = 1/2 VCC (LTC1542).
Note 3: Trip point is defined as the differential input voltage required to
make the comparator output change state. The difference between upper
and lower trip point is equal to the width of the input referred hysteresis,
VCM = REF (LTC1541). VCM = 1/2 VCC (LTC1542).
Note 4: The input leakage current is measured for COMPIN+ at 1.5V
(LTC1541) and COMPIN+ = COMPIN– = 1.5V (LTC1542).
5
5 Page 
TYPICAL APPLICATIO S
Negative Reference
VCC
3V TO 9V
200k
2– 8
LTC1542
3
OP AMP
+4
VSS
–3V
1
LT1634-2.5
VOUT
–2.5V
1541/42 TA05
LTC1541/LTC1542
Sungle Supply Function Generator
VCC
3V TO 12V
5M
2– 8
LTC1542 1
5M OP AMP
3+ 4
R1
10M
0.1µF
R2
500k 6 –
LTC1542
5
COMP
+
R3
5M
R1
FREQ ≈ 4C • R2 • R3
7
1541/42 TA04
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
MS8 Package
8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.007
(0.18)
0° – 6° TYP
0.021 ± 0.004
(0.53 ± 0.01)
0.040 ± 0.006
(1.02 ± 0.15)
SEATING
PLANE 0.012
(0.30)
0.006 ± 0.004
(0.15 ± 0.10)
0.025
(0.65)
TYP
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
0.118 ± 0.004*
(3.00 ± 0.10)
8 76 5
0.192 ± 0.004
(4.88 ± 0.10)
0.118 ± 0.004**
(3.00 ± 0.10)
1 234
MSOP08 0596
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0°– 8° TYP
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
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
BSC
0.228 – 0.244
(5.791 – 6.197)
0.189 – 0.197*
(4.801 – 5.004)
8 765
1 2 34
0.150 – 0.157**
(3.810 – 3.988)
SO8 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 LTC1541.PDF ] | |
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