Dell FAIRCHILD KM4212 Dual, 70μA, Low Cost, +2.7V & +5V, 7.3MHz Rail-to-Rail Amplifier Data Handbook
Summary
This datasheet documents the Fairchild KM4212 dual ultra-low power voltage feedback amplifier consuming only 70µA supply current per amplifier while delivering 7.3MHz small-signal bandwidth and 9V/µs slew rate. Fully specified at both +2.7V and +5V supplies (or ±2.5V), the rail-to-rail output swings from 0.04V to 4.96V on a 5V supply while the input voltage range extends 300mV below the negative rail and to 3.8V on a 5V supply. Input voltage noise is 29nV/√Hz with ±4mA linear output current and
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KM4212 Dual, 70µA, Low Cost, +2.7V & +5V, 7.3MHz Rail-to-Rail Amp Features General Description
70µA supply current The KM4212 is an ultra-low power, low cost, voltage 7.3MHz bandwidth feedback amplifier. The KM4212 uses only 70µA of supply current and is designed to operate on +2.7V,
Fully specified at +2.7V and +5V supplies
+5V, or ±2.5V supplies. The input voltage range
Output voltage range: 0.04V to 4.96V; Vs = +5
extends 300m V below the negative rail and 1.2V
Input voltage range: -0.3V to +3.8V; Vs = +5
below the positive rail.
9V/µs slew rate ±4m A linear output current
The KM4212 offers high bipolar performance at a low
±9m A short circuit output current
CMOS price. The KM4212 offers superior dynamic
29n V/√Hz input voltage noise
performance with a 7.3MHz small signal bandwidth
Competes with low power CMOS amps
and 9V/µs slew rate. The combination of low power,
Small package options (SOIC-8 and MSOP-8) high bandwidth, and rail-to-rail performance make
the KM4212 well suited for battery-powered commu-
Applications
nication/computing systems.
or al iz ed ag ni tu de 2d /d iv
Portable/battery-powered applications A/D buffer
The KM4112 single amplifier is also available.
Active filters Signal conditioning Portable test instruments Non-Inverting Freq. Response Vs = +5V
G = 2 Rf = 10kΩKM4212 Packages
SOIC-8
Out1 +Vs
-In1 Out2
+In1 -In2
-Vs +In2
MSOP-8 Frequency (MHz)
Out1 +Vs
-In1 Out2
+In1 -In2
-Vs +In2
REV. 1 August 2001
Page Summary Contents For Dell FAIRCHILD KM4212 Dual, 70μA, Low Cost, +2.7V & +5V, 7.3MHz Rail-to-Rail Amplifier Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 10 |
| File Size | 170.13 KB |
| Published | July 07, 2026 |
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Frequently Asked Questions
What is the primary function and key feature of the KM4212 amplifier?
It is an ultra-low power, low cost voltage supply current feedback amplifier. It offers a low quiescent current (62-95 µA) at 7.3 MHz bandwidth.
What operating supplies can the KM4212 handle?
It operates on +2.7V and +5V fully specified supplies, as well as ±2.5V supplies, with an electrical supply range of 2.7 to 5.5V.
Can this amplifier be used in battery-powered or portable applications?
Yes, its combination of low power consumption, high bandwidth, and rail-to-rail performance makes it well suited for battery-powered communications or computing systems.
What are the two available package options for the KM4212?
The packages available are SOIC-8 and MSOP-8. The full temperature range is specified as -40°C to +85°C.