LT1639 Linear Technology, LT1639 Datasheet

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LT1639

Manufacturer Part Number
LT1639
Description
1.2MHz/ 0.4V/us Over-The-TopTM Micropower Rail-to-Rail Input and Output Op Amps
Manufacturer
Linear Technology
Datasheet

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FEATURES
APPLICATIONS
TYPICAL
Over-The-Top is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Operates with Inputs Above V
Rail-to-Rail Input and Output
Low Power: 230 A per Amplifier Max
Gain Bandwidth Product: 1.2MHz
Slew Rate: 0.4V/ s
High Output Current: 25mA Min
Specified on 3V, 5V and 15V Supplies
Reverse Battery Protection to 18V
No Supply Sequencing Problems
High Voltage Gain: 1500V/mV
Single Supply Input Range: – 0.4V to 44V
High CMRR: 98dB
No Phase Reversal
Battery- or Solar-Powered Systems
Supply Current Sensing
Battery Monitoring
Micropower Active Filters
4mA to 20mA Transmitters
Portable Instrumentation
Sensor Conditioning
Over-The-Top Comparator with 100mV Hysteresis Centered at 0mV
V1
V2
10k
10k
APPLICATION
U
+
1/2 LT1638
A
1M
V
1M
CC
V
CC
= 5V, V
+
U
1M
V
CC
CM
1M
= 0V TO 44V, t
+
1/2 LT1638
B
V
CC
PD
= 27 s
Rail-to-Rail Input and Output
1638/39 TA01
Over-The-Top
V0
DESCRIPTION
The LT
operational amplifier available in the standard 8-pin PDIP and
SO packages as well as the 8-lead MSOP package. The
LT1639 is a low power quad rail-to-rail input and output
operational amplifier offered on the standard 14-pin PDIP
and surface mount packages.
The LT1638/LT1639 op amps operate on all single and
split supplies with a total voltage of 2.5V to 44V drawing
only 170 A of quiescent current per amplifier. These
amplifiers are reverse battery protected and draw no
current for reverse supply up to 18V.
The input range of the LT1638/LT1639 includes both
supplies, and a unique feature of this device is its capability
to operate over the top with either or both of its inputs
above V
common mode, independent of supply voltage. The input
stage incorporates phase reversal protection to prevent
false outputs from occurring even when the inputs are 22V
below the negative supply. Protective resistors are
included in the input leads so that current does not
become excessive when the inputs are forced below the
negative supply. The LT1638/LT1639 can drive loads up to
25mA and still maintain rail-to-rail capability. The op amps
are unity-gain stable and drive all capacitive loads up to
1000pF when optional output compensation is used.
®
1638 is a low power dual rail-to-rail input and output
+
. The inputs handle 44V, both differential and
5V
0V
Output Voltage vs Input Voltage
U
1.2MHz, 0.4V/ s
TM
LT1638/LT1639
Micropower
Op Amps
1638/39 TA02
1

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LT1639 Summary of contents

Page 1

... PDIP and SO packages as well as the 8-lead MSOP package. The LT1639 is a low power quad rail-to-rail input and output operational amplifier offered on the standard 14-pin PDIP and surface mount packages. ...

Page 2

... LT1639 N, S Packages – LT1638C MS8 Package – LT1638/LT1639 N, S Packages LT1638CMS8 V = 44V (Note 4) CM TOP VIEW OUT OUT D – – +IN A ...

Page 3

... – 100 A per Amplifier 1kHz – – – LT1638/LT1639 MIN TYP MAX UNITS 0 P-P 20 nV/ Hz 0.3 pA 2.5 M 1.4 5 ...

Page 4

... This depends on the power supply voltage and how many amplifiers are shorted. Note 3: The LT1638C/LT1639C are guaranteed to meet specifications and are designed, characterized and expected to meet the extended temperature limits, but are not tested at – and 85 C. ...

Page 5

... SINKING LOAD CURRENT (mA) 1638/39 G05 Noise Voltage Density vs Frequency 100 1k FREQUENCY (Hz) 1638/39 G09 LT1638/LT1639 Input Bias Current vs Common Mode Voltage 10000 8000 6000 T = – 125 –20 – ...

Page 6

... LT1638/LT1639 W U TYPICAL PERFORMANCE CHARACTERISTICS Gain and Phase Shift vs Frequency 2. PHASE GAIN –10 – 100 1000 FREQUENCY (kHz) 1638/39 G12 Gain Bandwidth Product and Phase Margin vs Supply Voltage 1500 60 1400 50 PHASE MARGIN 1300 40 GAIN BANDWIDTH 1200 ...

Page 7

... 0.5V TO 2. 0.2V TO 2.2V IN 0.001 0 LOAD RESISTANCE TO GROUND (k ) Large-Signal Response V = 15V LT1638/LT1639 Undistorted Output Swing vs Frequency 35 DISTORTION 15V 2. 10000 0.1 1 FREQUENCY (kHz) 1638/39 G22 Total Harmonic Distortion + Noise vs Output Voltage ...

Page 8

... Inputs The LT1638/LT1639 have two input stages, NPN and PNP (see the Simplified Schematic), resulting in three distinct operating regions as shown in the Input Bias Current vs Common Mode typical performance curve ...

Page 9

... U TYPICAL APPLICATIONS With 1.2MHz bandwidth, Over-The-Top capability, re- verse-battery protection and rail-to-rail input and output features, the LT1638/LT1639 are ideal candidates for general purpose applications. The lowpass slope limiting filter in Figure 1 limits the maximum dV/dT (not frequency) that it passes. When the input signal differs from the output by one forward diode drop will turn on ...

Page 10

... LT1638/LT1639 U TYPICAL APPLICATIONS proportional to the load current convenient monitor, the 2k load resistor converts the current into a voltage. The + positive supply rail not limited to the 5V supply of the op amp and could be as high as 44V 200 5V 0.2 + 1/2 LT1638 200 – I LOAD LOAD )(I ...

Page 11

... MIN 0.100 0.010 (2.540 0.254) S Package 14-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.004 – 0.010 (0.101 – 0.254) 0.228 – 0.244 (5.791 – 6.197) 0.050 (1.270) TYP LT1638/LT1639 0.400* (10.160) MAX 0.255 0.015* (6.477 0.381 ...

Page 12

... Independent of V and is converted into a voltage. Amp G . The scale factor for LOGIC 1/4 LT1639 – LOGIC HIGH (5V) = CHARGING LOGIC LOW (0V) = DISCHARGING + OUT 1/4 LT1639 10k – 90.9k 1638/39 F05 5V 500V/ 400kHz GBW OS(MAX) VOL(MIN) Extends 44V above V , ...

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