February 2001
KM4270
Product Brief
Dual, Low Cost, +2.7V and +5V,
Rail-to-Rail I/O Amplifier
Preliminary
Outperforms the competition in
single-supply applications at a
SOIC-8
(not actual size)
MSOP-8
(not actual size)
lower cost!
Advertised 5V
Specifications
G = 1 BW
Noise
Slew rate
Supply current
KM4270
4.3
27
9
160
A
5
22
2
850
Competitors
B
C
5.5 5.6
25
24
6.0
2
750 250
Features at 2.7V
I
I
I
I
I
I
I
I
I
160µA supply current per amplifier
4.9MHz bandwidth
Output swings to within 20mV of either rail
Input voltage range exceeds the rail by >250mV
5.3V/µs slew rate
35mA short circuit output current
24nV/√Hz input voltage noise
Directly replaces MAX4126, OPA2340, LMV822,
and TLV2462 in single supply applications
Available in SOIC and MSOP package options
Available Packages
SOIC
Out1
1
2
3
4
8
7
-
+
Applications
I
I
I
I
I
I
I
I
I
Portable/battery-powered applications
PCMCIA, USB
Mobile communications, cellular phones, pagers
Notebooks and PDA’s
Sensor Interface
A/D buffer
Active filters
Signal conditioning
Portable test instruments
General Description
The KM4270 is a dual ultra-low cost, low power,
voltage feedback amplifier. At 5V, the KM4270 uses
only 160µA of supply current per amplifier and is
designed to operate from a supply range of 2.5V to
5.5V. The input voltage range exceeds the negative
and positive rails. The KM4170 (single) and KM4470
(quad) are also available.
The KM4270 offers high bipolar performance at a low
CMOS price. The KM4270 offers superior dynamic
performance with a 4.9MHz small signal bandwidth
and 5.3V/µs slew rate. The combination of low power,
high bandwidth, and rail-to-rail performance make
the KM4270 well suited for battery-powered com-
munication/computing systems.
© 2001 Fairchild Semiconductor
Corporation
Patents Pending
P
e
r
m
i
l
-In1
+In1
-V
s
i
-
+
a
n
+V
s
Out1
Out2
-In2
+In2
-In1
+In1
-V
s
6
5
y
r
D
6.4
11
1.6
550
Units
MHz
nV/√Hz
V/µs
µA
MSOP
8
-
+
1
2
3
4
+V
s
Out2
-In2
+In2
7
-
+
6
5
Ordering Information
Part No.
Package
KM4270IC8
SOIC-8
KM4270IC8TR3
SOIC-8
KM4270IM8
MSOP-8
KM4270IM8TR3 MSOP-8
Container
Rail
Reel
Rail
Reel
Pack Qty
95
2500
50
4000
Eval Bd*
KEB006
KEB006
KEB010
KEB010
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.
www.fairchildsemi.com
KM4270
Typical Specifications
Electrical Characteristics
(G = +2, R
f
= 5kΩ, 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
overshoot
slew rate
CONDITIONS
TYP
Vs = +2.7V
Typical Circuit
Configuration
TYP
Vs = +5V
UNITS
+V
s
MHz
MHz
MHz
MHz
ns
%
V/µs
dBc
dBc
%
nV/Hz
nV/Hz
dB
mV
µV/°C
nA
pA/°C
dB
dB
µA
MΩ
pF
V
dBc
V
V
V
mA
mA
V
G = +1, V
o
= 0.02V
pp
G = +2, V
o
= 0.2V
pp
G = +2, V
o
= 2V
pp
4.9
3.7
1.4
2.2
163
<1
5.3
-75
-76
0.03
24
32
TBD
0.5
5
90
32
83
90
136
4.3
3.0
2.3
2.0
110
<1
9
-73
-75
0.03
27
28
TBD
1.5
15
90
40
60
80
160
6.8µF
+
Distortion and Noise Response
2nd harmonic distortion
1
3rd harmonic distortion
1
THD
1
input voltage noise
input voltage noise
crosstalk
DC Performance
input offset voltage
average drift
input bias current
average drift
power supply rejection ratio
open loop gain
quiescent current per amplifier
Pr
1V step
1V step
1V step
In
+
-
0.01µF
Out
R
f
KM4270
el
DC
1V
pp
, 10KHz
1V
pp
, 10KHz
1V
pp
, 10KHz
>10KHz
>2KHz
10KHz
R
g
Input Characteristics
input resistance
input capacitance
input common mode voltage range
common mode rejection ratio
DC
Output Characteristics
output voltage swing
im
12
12
2
2
-0.25
to 2.95
-0.25
to 5.25
81
85
0.020 to 2.68 0.04 to 4.96
0.05 to 2.63 0.07 to 4.9
0.11 to 2.52 0.14 to 4.67
16
30
35
60
2.5 to 5.5
output current
short circuit output current
recommended power supply operating range
2) For G = +1, R
f
= 0.
R
L
= 10kΩ to V
s
/2
R
L
= 1kΩ to V
s
/2
R
L
= 200Ω to V
s
/2
in
Notes:
1) For +5V supply, a 2V
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
θ
ja
for 8 lead SOIC
θ
ja
for 8 lead MSOP
0 to +6V
+175°C
-65°C to +150°C
+300°C
-40° to +85°C
+V
s
+ 0.5V, -V
s
- 0.5V
152°C/W
206°C/W
ar
y
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.
Lit No. 600312-001
Embedded System
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