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LT1638_15

Description
1.2MHz, 0.4V/s Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps
File Size260KB,18 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LT1638_15 Overview

1.2MHz, 0.4V/s Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps

FEATURES
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LT1638/LT1639
1.2MHz, 0.4V/µs
Over-The-Top Micropower
Rail-to-Rail Input and Output
Op Amps
DESCRIPTION
The LT
®
1638 is a low p wer dual rail-to-rail input and output
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 in the standard 14-pin PDIP
and surface mount packages. For space limited applications
the LT1638 is available in a 3mm x 3mm x 0.8mm dual
fine pitch leadless package (DFN).
The LT1638/LT1639 op amps operate on all single and split
supplies with a total voltage of 2.5V to 44V drawing only
170μA of quiescent current per amplifier. These ampli-
fiers are reverse battery protected and draw no current
for reverse supply up to 18V.
The input range of the LT1638/LT1639 includes both sup-
plies, and a unique feature of this device is its capability
to operate over the top with either or both of its inputs
above V
+
. The inputs handle 44V, both differential and
common mode, independent of supply voltage. The input
stage incorporates phase reversal protection to prevent
false outputs from occurring when the inputs are 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.
Output Voltage vs Input Voltage
Operates with Inputs Above V
+
Rail-to-Rail Input and Output
Low Power: 230μA per Amplifier Max
Gain Bandwidth Product: 1.2MHz
Slew Rate: 0.4V/μs
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
Available in 14-Lead SO, 8-Lead MSOP and DFN
Packages
APPLICATIONS
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Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
Supply Current Sensing
Battery Monitoring
Micropower Active Filters
4mA to 20mA Transmitters
L,
LT, LTC, LTM, Over-The-Top, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATION
Over-The-Top
®
Comparator with
100mV Hysteresis Centered at 0mV
10k
V1
V
CC
1M
1M
V
CC
V
CC
5V
+
A
1/2 LT1638
+
B
1/2 LT1638
1M
V0
0V
10k
V2
1M
1638/39 TA01
V
CC
= 5V, V
CM
= 0V TO 44V, t
PD
= 27μs
20mV/DIV
1638/39 TA02
16389fg
1

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LT1638_15 LT1639_15
Description 1.2MHz, 0.4V/s Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps 1.2MHz, 0.4V/s Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps
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