LT1784 LINER [Linear Technology], LT1784 Datasheet

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LT1784

Manufacturer Part Number
LT1784
Description
2.5MHz, Over-The-Top Low Power, Rail-to-Rail Input and Output Op Amp in SOT-23
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Operates with Inputs Above V
Rail-to-Rail Input and Output
Low Profile (1mm) ThinSOT
Gain Bandwidth Product: 2.5MHz
Slew Rate: 2.1V/ s
Low Input Offset Voltage: 3.5mV Max
High Voltage Gain: 1000V/mV
Single Supply Input Range: 0V to 18V
Specified on 3V, 5V and 5V Supplies
Reverse Battery Protection to 18V
Low Power: 750 A Supply Current Max
Output Shutdown on 6-Lead Version
High Output Current: 15mA Min
Operating Temperature Range: – 40 C to 85 C
Portable Instrumentation
Battery-Powered Systems
Sensor Conditioning
Supply Current Sensing
MUX Amplifiers
4mA to 20mA Transmitters
Programmable Gain, A
IN
9.09k
R2
R3
1k
SHDN
+
LT1782
10k
U
R1
A
V
= 20
V
V
CC
EE
V
V
CC
= 2, A
A
V
= 2
SHDN
V
OR 1+
TM
A
= 20, 100kHz Amplifier
V
+
+
= 1+
LT1784
U
Package
R1 + R2
R2 + R3
V
V
CC
EE
R3
R1
1784 TA01
OUT
and Output Op Amp in SOT-23
Low Power, Rail-to-Rail Input
DESCRIPTIO
The LT
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 750 A 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-Top
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 5 A. 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.
Over-The-Top and ThinSOT are trademarks of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1784 is a 2.5MHz op amp available in the small
2.5MHz, Over-The-Top
Programmable Gain Amplifier
–10
–15
–20
–5
30
25
20
15
10
5
0
1k
Frequency Response
U
10k
A
A
V
V
FREQUENCY (Hz)
= 20
= 2
100k
1M
1784 TA01a
10M
LT1784
TM
opera-
1

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LT1784 Summary of contents

Page 1

... 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 ...

Page 2

... C A 0.1Hz to 10Hz f = 10kHz f = 10kHz Differential Common Mode – 1.2V Common Mode 18V CM ORDER PART NUMBER TOP VIEW + V 6 LT1784CS6 SHDN 5 LT1784IS6 – PART MARKING S6 PACKAGE LTIW = 230 LTIX = MIN TYP MAX 1.5 3.5 4.2 4 250 ...

Page 3

... – OUT P 5V 0.1 –1 S OUT 3V 1. 10k 1kHz LT1784 = MIN TYP MAX UNITS 100 dB 133 1000 V/mV 90 V/mV 60 V/mV 266 1000 V/mV 180 V/mV 120 V/ ...

Page 4

... LT1784 ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the specified temperature range, otherwise specifications are 5V 0V,V = 0V, for the 6-lead part OUT SYMBOL PARAMETER V Input Offset Voltage Input Offset Voltage Drift (Note Input Offset Current OS I Input Bias Current ...

Page 5

... GBW at Note 11: The LT1784C is guaranteed to meet specified performance from The LT1784C is designed, characterized and expected to meet specified performance from – but is not tested or QA sampled at these temperatures. LT1784I is guaranteed to meet specified performance from – ...

Page 6

... LT1784 W U TYPICAL PERFOR A CE CHARACTERISTICS Input Bias Current vs Common Mode Voltage 300,000 250,000 200,000 150,000 100,000 800 T = – 600 400 T = 125 C A 200 0 –200 –400 3.5 4 4 COMMON MODE VOLTAGE (V) 1784 G04 Output Saturation Voltage vs ...

Page 7

... FREQUENCY (Hz) Disabled Output Impedance vs Frequency 2. 2.5V PIN 5 100k 10k 1k 100 100 1k 10k 100k FREQUENCY (Hz) LT1784 Gain Bandwidth Product and Phase Margin vs Supply Voltage A = –1 V PHASE MARGIN 10k 5kHz GAIN BANDWIDTH 2.7 PRODUCT 2.6 2.5 2.4 125 ...

Page 8

... LT1784 W U TYPICAL PERFOR A CE CHARACTERISTICS Capacitive Load Handling Overshoot vs Capacitive Load 5V 2. 100 1000 CAPACITIVE LOAD (pF) 1784 G22 Total Harmonic Distortion + Noise vs Load Resistance TOTAL ...

Page 9

... V . The input offset voltage of the NPN stage is untrimmed and is typically 3mV. A Schottky diode in the collector of the input transistors, along with special geometries for these NPN transistors, allow the LT1784 to operate with either or both of its inputs + + above about 0.3V above V , the NPN input transis- tors is fully saturated and the input bias current is typically 200 A at room temperature ...

Page 10

... Q12 0.75k 0.75k Q9 Q10 D4 D5 – . When shut – Adjustable Clamp + V – LT1784 + V CLAMP + – LT1784 OUT V - ~80mV CLAMP – 10k WORKS WELL – 100kHz Q3 D3 Q19 Q17 Q16 Q18 Q15 Q13 Q14 ...

Page 11

... REF A2 A 1.90 .09 – .20 (.074) (.004 – .008) REF (NOTE 2) LT1784 .25 – .50 (.010 – .020) (5PLCS, NOTE 2) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES) 3. DRAWING NOT TO SCALE 4. DIMENSIONS ARE INCLUSIVE OF PLATING 5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 6 ...

Page 12

... Simple Polarity Selector IN 1V/DIV OUT 1V/DIV OUT FOLLOW 0V SHDN – V 5V/DIV INVERT 1785 TA06a LT1784 LT1784 – 10V + 1784 TA02 INPUTS BELOW GROUND Single Supply Full Wave Rectifier 1k OUT BAT54 – LT1784 + WORKS WELL TO 15kHz 1785 TA05 1785 TA06b ...

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