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LT1784 Schematic ( PDF Datasheet ) - Linear Technology

Teilenummer LT1784
Beschreibung Over-The-Top Low Power / Rail-to-Rail Input and Output Op Amp in SOT-23
Hersteller Linear Technology
Logo Linear Technology Logo 




Gesamt 12 Seiten
LT1784 Datasheet, Funktion
www.DataSheet4U.com
LT1784
2.5MHz, Over-The-Top
Low Power, Rail-to-Rail Input
and Output Op Amp in SOT-23
FEATURES
s Operates with Inputs Above V+
s Rail-to-Rail Input and Output
s Low Profile (1mm) ThinSOTTM Package
s Gain Bandwidth Product: 2.5MHz
s Slew Rate: 2.1V/µs
s Low Input Offset Voltage: 3.5mV Max
s High Voltage Gain: 1000V/mV
s Single Supply Input Range: 0V to 18V
s Specified on 3V, 5V and ±5V Supplies
s Reverse Battery Protection to 18V
s Low Power: 750µA Supply Current Max
s Output Shutdown on 6-Lead Version
s High Output Current: 15mA Min
s
Operating
Temperature
U
Range:
40°C
to
85°C
APPLICATIO S
s Portable Instrumentation
s Battery-Powered Systems
s Sensor Conditioning
s Supply Current Sensing
s MUX Amplifiers
s 4mA to 20mA Transmitters
DESCRIPTIO
The LT®1784 is a 2.5MHz op amp available in the small
SOT-23 package that operates on all single and split
supplies with a total voltage of 2.5V to 18V. The amplifier
draws less than 750µA of quiescent current and has
reverse battery protection, drawing negligible current for
reverse supply voltages up to 18V.
The input range of the LT1784 includes ground, and a
unique feature of this device is its Over-The-TopTM opera-
tion capabilitity with either or both of its inputs above the
positive rail. The inputs handle 18V both differential and
common mode, independent of supply voltage. The input
stage incorporates phase reversal protection to prevent
false outputs from occurring even when the inputs are 9V
below the negative supply.
The LT1784 can drive loads up to 15mA and still maintain
rail-to-rail capability. A shutdown feature on the 6-lead
version can disable the part, making the output high
impedance and reducing quiescent current to 5µA. The
LT1784 op amp is available in the 5- and 6-lead
SOT-23 packages. For applications requiring lower power,
refer to the LT1782 and LT1783 data sheets.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top and ThinSOT are trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Programmable Gain, AV = 2, AV = 20, 100kHz Amplifier
VCC
AV = 20
AV = 2
IN
R2
9.09k
R3
1k
SHDN
VCC
+
LT1782
VEE
R1
10k
SHDN
VCC
+
LT1784
VEE
OUT
( )R1 + R2
AV = 1+
R3
( )R1
OR 1+
R2 + R3
1784 TA01
DataSheet4 U .com
Programmable Gain Amplifier
Frequency Response
30
25
20
15
10
5
0
–5
–10
–15
–20
1k
AV = 20
AV = 2
10k 100k 1M
FREQUENCY (Hz)
10M
1784 TA01a
1






LT1784 Datasheet, Funktion
www.DataSheet4U.com
LT1784
TYPICAL PERFOR A CE CHARACTERISTICS
Input Bias Current vs Common
Mode Voltage
300,000
250,000 VS = 5V, 0V
200,000
150,000
100,000
TA = 25°C
800
600 TA = –55°C
400
TA = 125°C
200
0
–200
–400
3.5
4 4.5 5 5.5 14 16 18
COMMON MODE VOLTAGE (V)
1784 G04
Output Saturation Voltage vs
Input Overdrive
100
OUTPUT HIGH
Output Saturation Voltage vs
Load Current (Output High)
1
VS = ±2.5V
VOD = 30mV
Output Saturation Voltage vs
Load Current (Output Low)
1
VS = ±2.5V
VOD = 30mV
0.1 TA = 125°C
TA = 25°C
TA = –55°C
0.01
1
10 100 1000 10000
SOURCING LOAD CURRENT (µA)
1784 G05
0.1 TA = 125°C
TA = 25°C
0.01
TA = –55°C
0.001
1
10 100 1000
SINKING LOAD CURRENT (µA)
10000
1784 G06
Output Short-Circuit Current vs
Temperature
50
VS = ±5V
45
0.1Hz to 10Hz Noise Voltage
VS = ±2.5V
10
OUTPUT LOW
VS = ±2.5V
NO LOAD
1
0 10 20 30 40
INPUT OVERDRIVE (mV)
50
60
1784 G07
Noise Voltage Density vs
Frequency
100
VS = ±2.5V
90
80
70
60
50
40
30
20
10
0
1 10 100 1k 10k 100k
FREQUENCY (Hz)
1784 G10
40
SINKING
35
30
25
–50 –25
SOURCING
0 25 50 75
TEMPERATURE (°C)
100 125
DC194 G02
0 12
3 4 5 6 7 8 9 10
TIME (sec)
1784 G09
Input Noise Current vs
Frequency
1.6
VS = ±2.5V
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1 10 100 1k 10k 100k
FREQUENCY (Hz)
1784 G11
Gain and Phase Shift vs
Frequency
70
60
120
VS = ±2.5V
100
50
PHASE
80
40 60
30 40
20 20
GAIN
10 0
0 –20
–10 –40
–20 –60
–30
1k
10k 100k 1M
FREQUENCY (Hz)
–80
10M
1784 G12
6
DataSheet4 U .com

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LT1784 pdf, datenblatt
www.DataSheet4U.com
LT1784
TYPICAL APPLICATIO S
Protected Fault Conditions
–18V
+ V+
LT1784
5V
+ V+
LT1784
+–
24V
5V
+
+
18V LT1784
REVERSE BATTERY
INPUT OVERVOLTAGE
INPUT DIFFERENTIAL VOLTAGE
5V
+
LT1784
10V
1784 TA02
INPUTS BELOW GROUND
Simple Peak Detector
5V
VIN +
LT1784
BAT54
ACCURACY
98%
90%
3dB
BANDWIDTH
3kHz TO 5.7kHz
116Hz TO 47kHz
34Hz TO 96kHz
1µF
VIN = 3VP-P, VCM = 2.5V
VOUT
100k
1784 TA04
Single Supply Full Wave Rectifier
1k
IN
1k
5V
1k
OUT
BAT54
LT1784
+
WORKS WELL
TO 15kHz
1785 TA05
1k
IN
Simple Polarity Selector
1k
V+
LT1784
+ SHDN
V
OUT
FOLLOW 0V
INVERT
V
1785 TA06a
IN
1V/DIV
OUT
1V/DIV
SHDN
5V/DIV
VS = ±5V
100µs/DIV
VIN = 3VP-P AT 5kHz
1785 TA06b
RELATED PARTS
PART NUMBER
LT1782
LT1783
LT1797
LT1637
LT1638/LT1639
LT1880
DESCRIPTION
Micropower Over-The-Top Rail-to-Rail In/Out Op Amp in SOT-23
1.25MHz Over-The-Top Rail-to-Rail In/Out Op Amp in SOT-23
10MHz Rail-to-Rail In/Out Op Amp in SOT-23
1.1MHz Over-The-Top Rail-to-Rail In/Out Op Amp
Dual/Quad 1.2MHz Over-The-Top Rail-to-Rail In/Out Op Amp
SOT-23 Pico Amp Input, Precision, Rail-to-Rail Output Op Amp
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
DataSheet4 U .com(408) 432-1900 q FAX: (408) 434-0507 q www.linear.com
COMMENTS
55µA Max Supply Current, 800µV Max Offset Voltage
300µA Max Supply Current, 800µV Max Offset Voltage
Unity-Gain Stable, 2.25µV/µs Slew Rate
Micropower, 0.4V/µs Slew Rate
Micropower 230µA Max, 0.4V/µs Slew Rate
150µV Offset, 900pA Bias Current
1784f LT/TP 0601 2K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2000

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