LT1638 Datasheet, PDF (1/12 Pages) Linear Technology – 1.2MHz, 0.4V/us Over-The-TopTM Micropower Rail-to-Rail Input and Output Op Amps

FEATURES
s _{Operates with Inputs Above V} ⁺
s _{Rail-to-Rail Input and Output}
s _{Low Power: 230µA per Amplifier Max}
s _{Gain Bandwidth Product: 1.2MHz}
s _{Slew Rate: 0.4V/µs}
s _{High Output Current: 25mA Min}
s _{Specified on 3V, 5V and ±15V Supplies}
s _{Reverse Battery Protection to 18V}
s _{No Supply Sequencing Problems}
s _{High Voltage Gain: 1500V/mV}
s _{Single Supply Input Range: – 0.4V to 44V}
s _{High CMRR: 98dB}
s _{No Phase Reversal}
U
APPLICATIONS
s _{Battery- or Solar-Powered Systems}
Portable Instrumentation
Sensor Conditioning
s _{Supply Current Sensing}
s _{Battery Monitoring}
s _{Micropower Active Filters}
s _{4mA to 20mA Transmitters}
, LTC and LT are registered trademarks of Linear Technology Corporation.
Over-The-Top is a trademark of Linear Technology Corporation.
LT1638/LT1639
1.2MHz, 0.4V/µs
Over-The-Top^TM Micropower
Rail-to-Rail Input and Output
Op Amps
DESCRIPTION
The LT^®1638 is a low power 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 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 170µA 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⁺. 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 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.
TYPICAL APPLICATION
Over-The-Top Comparator with 100mV Hysteresis Centered at 0mV
10k
1M
V_CC
V1
V_CC
1M
V_CC
+
A
1/2 LT1638
+
B
1/2 LT1638
V0
–
1M
–
10k
V2
1M
1638/39 TA01
V_CC = 5V, V_CM = 0V TO 44V, t_PD = 27µs
Output Voltage vs Input Voltage
5V
0V
1638/39 TA02
1