Fairchild Semiconductor KM4270IC8TR3 Datasheet
Preliminary
Preliminary
February 2001
KM4270
Dual, Low Cost, +2.7V and +5V,
Rail-to-Rail I/O Amplifier
Product Brief
Features at 2.7V
■
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
Applications
■
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 communication/computing systems.
© 2001 Fairchild Semiconductor Corporation www.fairchildsemi.com
Patents Pending
Outperforms the competition in
single-supply applications at a
lower cost!
Advertised 5V KM4270 Competitors Units
Specifications A B C D
G = 1 BW 4.3 5 5.5 5.6 6.4 MHz
Noise 27 22 25 24 11 nV/√Hz
Slew rate 9 2 6.0 2 1.6 V/µs
Supply current 160 850 750 250 550 µA
Available Packages
Ordering Information
Part No. Package Container Pack Qty Eval Bd*
KM4270IC8 SOIC-8 Rail 95 KEB006
KM4270IC8TR3 SOIC-8 Reel 2500 KEB006
KM4270IM8 MSOP-8 Rail 50 KEB010
KM4270IM8TR3 MSOP-8 Reel 4000 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.
SOIC
MSOP
MSOP-8
(not actual size)
SOIC-8
(not actual size)
+V
Out1
-In1
+In1
-V
1
2
-
+
3
4
s
8
7
6
-
+
5
Out2
-In2
+In2
Out1
s
-In1
+In1
-V
s
1
2
3
4
-
+
+V
8
s
Out2
7
-In2
6
-
+
5
+In2
Preliminary
KM4270
Typical Specifications
Typical Circuit
Configuration
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
Electrical Characteristics
(G = +2, Rf= 5kΩ, RL= 10kΩ to Vs/2, Ta= +25°C, unless noted)
PARAMETERS CONDITIONS TYP TYP UNITS
Vs = +2.7V Vs= +5V
Frequency Domain Response
2
-3dB bandwidth G = +1, Vo= 0.02V
pp
4.9 4.3 MHz
G = +2, Vo= 0.2V
pp
3.7 3.0 MHz
full power bandwidth G = +2, Vo= 2V
pp
1.4 2.3 MHz
gain bandwidth product 2.2 2.0 MHz
Time Domain Response
rise and fall time 1V step 163 110 ns
overshoot 1V step <1 <1 %
slew rate 1V step 5.3 9 V/µs
Distortion and Noise Response
2nd harmonic distortion
1
1Vpp, 10KHz -75 -73 dBc
3rd harmonic distortion
1
1Vpp, 10KHz -76 -75 dBc
THD
1
1Vpp, 10KHz 0.03 0.03 %
input voltage noise >10KHz 24 27 nV/Hz
input voltage noise >2KHz 32 28 nV/Hz
crosstalk 10KHz TBD TBD dB
DC Performance
input offset voltage 0.5 1.5 mV
average drift 5 15 µV/°C
input bias current 90 90 nA
average drift 32 40 pA/°C
power supply rejection ratio DC 83 60 dB
open loop gain 90 80 dB
quiescent current per amplifier 136 160 µA
Input Characteristics
input resistance 12 12 MΩ
input capacitance 2 2 pF
input common mode voltage range -0.25 to 2.95 -0.25 to 5.25 V
common mode rejection ratio DC 81 85 dBc
Output Characteristics
output voltage swing RL= 10kΩ to Vs/2 0.020 to 2.68 0.04 to 4.96 V
RL= 1kΩ to Vs/2 0.05 to 2.63 0.07 to 4.9 V
RL= 200Ω to Vs/2 0.11 to 2.52 0.14 to 4.67 V
output current 16 30 mA
short circuit output current 35 60 mA
recommended power supply operating range 2.5 to 5.5 V
Notes: 1) For +5V supply, a 2V
pp
condition was used.
2) For G = +1, R
f
= 0.
Absolute Maximum Ratings
supply voltage 0 to +6V
maximum junction temperature +175°C
storage temperature range -65°C to +150°C
lead temperature (10 sec) +300°C
operating temperature range -40° to +85°C
input voltage range +Vs + 0.5V, -Vs - 0.5V
θjafor 8 lead SOIC 152°C/W
θjafor 8 lead MSOP 206°C/W
+V
s
6.8µF
+
In
R
g
0.01µF
+
KM4270
R
Out
f
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