June 2001
KM4112
Product Brief
SOT23-5 shown (not actual size)
70µA, Low Cost, +2.7V and +5V,
7.3MHz Rail-to-Rail Amplifier
Outperforms the competition in
single-supply applications at a
lower power!
Features
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70µA supply current
7.3MHz bandwidth
Fully specified at +2.7V and +5V supplies
Output voltage range: 0.04V to 4.96V; V
s
= +5
Input voltage range: -0.3V to +3.8V; V
s
= +5
9V/µs slew rate
±4mA linear output current
±9mA short circuit output current
29nV/√Hz input voltage noise
Competes with low power CMOS amplifiers
Small package option (SOT23-5)
Advertised
Specifications
G = 1 BW
Noise
Slew rate
Supply current
KM4112
7.3
29
9
70
Typical CMOS
Amplifier
1
30
1
50
Units
MHz
nV/
√
Hz
V/
µ
s
µA
Typical Performance Plot
Non-Inverting Freq. Response V
s
= +5V
Normalized Magnitude (2dB/div)
G=
2
R
f
= 10kΩ
Applications
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Portable/battery-powered applications
A/D buffer
Active filters
Signal conditioning
Portable test instruments
General Description
The KM4112 is an ultra-low power, low cost, voltage
feedback amplifier. The KM4112 uses only 70µA of
supply current and is designed to operate on +2.7V,
+5V, or ±2.5V supplies. The input voltage range
extends 300mV below the negative rail and 1.2V
below the positive rail.
The KM4112 offers high bipolar performance at a
low CMOS price. The KM4112 offers superior
dynamic performance with a 7.3MHz small signal
bandwidth and 9V/µs slew rate. The combination
of low power, high bandwidth, and rail-to-rail
performance make the KM4112 well suited for
battery-powered communication/computing systems.
0.01
0.1
1
10
Frequency (MHz)
Ordering Information
Part No.
KM4111IT5
KM4111IT5TR3
Package
SOT23-5
SOT23-5
Container
Partial Reel
Reel
Pack Qty
<3000
3000
Eval Bd*
KEB002
KEB002
Temperature range for all parts: -40°C to +85°C.
* Evaluation boards are available to aid in the evaluation of these products. See the full
data sheet or website for complete information.
© 2001 Fairchild Semiconductor International
Patents Pending
www.fairchildsemi.com
KM4112
Typical Specifications
Electrical Characteristics
(G = +2, R
f
= 10kΩ, R
L
= 10kΩ to V
s
/2, T
a
= +25°C, unless noted)
PARAMETERS
Frequency Domain Response
2
-3dB bandwidth
full power bandwidth
gain bandwidth product
Time Domain Response
rise and fall time
settling time to 0.1%
1
overshoot
slew rate
Distortion and Noise Response
2nd harmonic distortion
1
3rd harmonic distortion
1
THD
1
input voltage noise
DC Performance
input offset voltage
average drift
input bias current
average drift
input offset current
power supply rejection ratio
open loop gain
quiescent current
CONDITIONS
TYP
Vs = +2.7V
Available Package
TYP
Vs = +5V
UNITS
Out
-V
s
+In
1
2
SOT23-5
5
+V
s
G = +1, V
o
= 0.05V
pp
G = +2, V
o
< 0.2V
pp
G = -1, V
o
= 2V
pp
6.5
3
2
3.5
55
700
4
7
68
65
63
30
1
3
90
100
2.1
63
82
62
7.3
3.4
2.5
4
50
600
7
9
67
56
55
29
1
8
90
100
1.3
63
76
70
MHz
MHz
MHz
MHz
ns
ns
%
V/µs
dBc
dBc
dB
nV/Hz
mV
µV/°C
nA
pA/°C
nA
dB
dB
µA
MΩ
pF
V
dB
V
V
mA
mA
V
-
+
3
4
-In
0.2V step
2V step
2V step
2V step, G = -1
2V
pp
, 100kHz
2V
pp
, 100kHz
2V
pp
, 100kHz
>10kHz
Typical Circuit
Configuration
+V
s
6.8µF
+
In
+
-
R
g
0.01µF
Out
R
f
DC
KM4112
Input Characteristics
input resistance
input capacitance
input common mode voltage range
common mode rejection ratio
DC
Output Characteristics
output voltage swing
linear output current
short circuit output current
power supply operating range
2) For G = +1, R
f
= 0.
>10
1.6
1.6
-0.3 to 1.5 -0.3 to 3.8
95
97
0.035 to 2.665 0.04 to 4.96
R
L
= 10kΩ to V
s
/2
R
L
= 2kΩ to V
s
/2
0.07 to 2.6 0.09 to 4.9
±4
±4
±9
±9
2.5 to 5.5
Notes:
1) For +2.7V supply, a 1V
pp
condition was used.
Absolute Maximum Ratings
supply voltage
maximum junction temperature
storage temperature range
lead temperature (10 sec)
operating temperature range
input voltage range
internal power dissipation
θ
ja
for 5 lead SOT23
0 to +6V
+175°C
-65°C to +150°C
+260°C
-40° to +85°C
+V
s
+0.5V; -V
s
-0.5V
see power derating curves in the full data sheet
256°C/W
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT
OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:
1.
Life support devices or systems are devices or systems which, (a) are intended for
surgical implant into the body, or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a significant injury of the user.
2.
A critical component in any component of a life support device or system whose failure
to perform can be reasonably expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
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