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PDF LT1797 Data sheet ( Hoja de datos )
| Número de pieza | LT1797 | |
| Descripción | 10MHz/ Rail-to-Rail Input and Output Op Amp in SOT-23 | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Rail-to-Rail Input and Output
s Small SOT-23 Package
s Gain Bandwidth Product: 10MHz
s –40°C to 85°C Operation
s Slew Rate: 2.25V/µs
s Low Input Offset Voltage: 1.5mV Max
s High Output Current: 25mA Min
s Specified on 3V, 5V and ±5V Supplies
s High Voltage Gain: 1000V/mV 10k Load
s High CMRR: 88dB Min
s High PSRR: 80dB Min
s Input Bias Current: 300nA Max
s Input Offset CurrUent: 25nA Max
APPLICATIO S
s Portable Instrumentation
s Rail-to-Rail Buffer Amplifiers
s Low Voltage Signal Processing
s Driving A/D Converters
s Battery-Powered Systems
LT1797
10MHz, Rail-to-Rail
Input and Output
Op Amp in SOT-23
DESCRIPTIO
The LT®1797 is a unity-gain stable 10MHz op amp avail-
able in the small SOT-23 package that operates on all
single and split supplies with a total voltage of 2.7V to 12V.
The amplifier draws 1mA of quiescent current and has a
slew rate of 2.25V/µs.
The input common mode range of the LT1797 includes
both rails, making it ideal for current sensing applications.
The input stage incorporates phase reversal protection to
prevent false outputs from occurring when the inputs are
driven beyond the supplies. Protective resistors are in-
cluded in the input leads so that current does not become
excessive when the inputs are forced above or below the
supplies.
The output of the LT1797 can swing to within 50mV of V +
and 8mV of V – without drawing excess current in either
condition. The amplifier can drive loads up to 25mA and
still maintain rail-to-rail capability.
The LT1797 op amp is available in the space saving 5-lead
SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
3.3k
0805
×3
BZX84C6V8
VZ = 6.8V
–48V SUPPLY
(–42V TO –56V)
Fast Compact – 48V Current Sense
30.1Ω
1%
0.003Ω
1% 3W
–+
ISENSE
–
LT1797
+
VOUT = 3V – 0.1Ω • ISENSE
ISENSE = 0A TO 30A
ACCURACY ≈ 3%
VOUT
Q1
FMMT493
R1 1k
4.7k 1%
VS = 3V
R1 REDUCES Q1 DISSIPATION
0.1µF
SETTLES TO 1% IN 2µs,
1V OUTPUT STEP
–48V LOAD
1797 TA01
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
1.8
1.6 TA = 125°C
1.4
1.2 TA = 25°C
1.0
TA = –55°C
0.8
0.6
0.4
0.2
0
0 1 2 3 4 5 6 7 8 9 10 11 12
TOTAL SUPPLY VOLTAGE (V)
1797 G01
Output Saturation Voltage
vs Load Current (Output High)
1
VS = ±2.5V
VOD = 30mV
Minimum Supply Voltage
300
200
100
0
–100
TA = 125°C
TA = 25°C
–200
TA = –55°C
–300
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
TOTAL SUPPLY VOLTAGE (V)
1797 G02
Output Saturation Voltage
vs Load Current (Output Low)
1
VS = ±2.5V
VOD = 30mV
TA = 25°C
0.1
TA = 125°C
TA = –55°C
0.01
1µ
10µ 100µ 1m
SOURCING LOAD CURRENT (A)
10m
1797 G04
Output Short-Circuit Current
vs Temperature
50
VS = ±2.5V
45
SOURCING CURRENT
40
SINKING CURRENT
35
30
25
20
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1797 G07
0.1
0.01 TA = 125°C
TA = –55°C
TA = 25°C
0.001
1µ
10µ 100µ
1m
SINKING LOAD CURRENT (A)
10m
1797 G05
0.1Hz to 10Hz Noise Voltage
VS = ±5V
0 1 2 3 4 5 6 7 8 9 10
TIME (SEC)
1797 G08
LT1797
Input Bias Current
vs Common Mode Voltage
100
VS = 5V, 0V
50
TA = –55°C
0
TA = 25°C
–50 TA = 125°C
–100
–150
–200
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
COMMON MODE VOLTAGE (V)
1797 G03
Output Saturation Voltage
vs Input Overdrive
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0
VS = ±2.5V
IOUT = 0
OUTPUT HIGH
OUTPUT LOW
10 20 30 40 50 60 70 80 90 100
INPUT OVERDRIVE (mV)
1797 G06
Input Noise Voltage Density
vs Frequency
100
VS = ±2.5V
80
60
40
20
0
10 100 1k 10k 100k
FREQUENCY (Hz)
1797 G09
5
5 Page 
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
S5 Package
5-Lead Plastic SOT-23
(LTC DWG # 05-08-1633)
2.80 – 3.00
(0.110 – 0.118)
(NOTE 3)
2.60 – 3.00
(0.102 – 0.118)
1.50 – 1.75
(0.059 – 0.069)
1.90
(0.074)
REF
0.00 – 0.15
(0.00 – 0.006)
0.95
(0.037)
REF
0.90 – 1.45
(0.035 – 0.057)
0.35 – 0.55
(0.014 – 0.022)
0.09 – 0.20
(0.004 – 0.008)
(NOTE 2)
0.35 – 0.50
0.90 – 1.30
(0.014 – 0.020) (0.035 – 0.051)
FIVE PLACES (NOTE 2)
S5 SOT-23 0599
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DIMENSIONS ARE INCLUSIVE OF PLATING
3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
4. MOLD FLASH SHALL NOT EXCEED 0.254mm
5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ)
LT1797
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 LT1797.PDF ] | |
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