Fairchild Semiconductor KM4112 Datasheet
Features
■
70µA supply current
■
7.3MHz bandwidth
■
Fully specified at +2.7V and +5V supplies
■
Output voltage range: 0.04V to 4.96V; Vs= +5
■
Input voltage range: -0.3V to +3.8V; Vs= +5
■
9V/µs slew rate
■
±4mA linear output current
■
±9mA short circuit output current
■
29nV/√Hz input voltage noise
■
Competes with low power CMOS amps
■
Small package option (SOT23-5)
Applications
■
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.
KM4112
70µA, Low Cost, +2.7V & +5V, 7.3MHz Rail-to-Rail Amplifier
www.fairchildsemi.com
REV. 2 July 2001
KM4112 Package
SOT23-5
Non-Inverting Freq. Response Vs = +5V
G = 2
Rf = 10kΩ
Out
-V
+In
+V
1
2
s
+
3
5
s
-
4
-In
Normalized Magnitude (2dB/div)
0.01
0.1
Frequency (MHz)
1
10
DATA SHEET KM4112
2 REV. 2 July 2001
PARAMETERS CONDITIONS TYP MIN & MAX UNITS NOTES
Case Temperature +25°C +25°C
Frequency Domain Response
-3dB bandwidth G = +1, Vo= 0.05V
pp
6.5 MHz 1
G = +2, Vo< 0.2V
pp
3 MHz
full power bandwidth G = -1, Vo= 2V
pp
2 MHz
gain bandwidth product 3.5 MHz
Time Domain Response
rise and fall time 0.2V step 55 ns
settling time to 0.1% 1V step 700 ns
overshoot 1V step, 7 %
slew rate 2V step, G = -1 7 V/µs
Distortion and Noise Response
2nd harmonic distortion 1Vpp, 100kHz 68 dBc
3rd harmonic distortion 1Vpp, 100kHz 65 dBc
THD 1Vpp, 100kHz 63 dB
input voltage noise >10kHz 30 nV/√Hz
DC Performance
input offset voltage 1 ±5 mV 2
average drift 3 µV/°C
input bias current 90 250 nA 2
average drift 100 pA/°C
input offset current 2.1 100 nA 2
power supply rejection ratio DC 63 58 dB 2
open loop gain 82 65 dB 2
quiescent current 62 95 µA2
Input Characteristics
input resistance >10 MΩ
input capacitance 1.6 pF
input common mode voltage range -0.3 to 1.5 V
common mode rejection ratio DC, Vcm= 0V to Vs- 1.5 95 68 dB 2
Output Characteristics
output voltage swing RL= 10kΩ to Vs/2 0.035 to 2.665 0.15 to 2.55 V 2
RL= 2kΩ to Vs/2 0.07 to 2.6 V
linear output current ±4 mA
short circuit output current ±9 mA
power supply operating range 2.7 2.5 to 5.5 V
Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels
are determined from tested parameters.
NOTES:
1) For G = +1, Rf= 0.
2) 100% tested at +25°C.
Absolute Maximum Ratings Package Thermal Resistance
supply voltage 0 to +6V
Package θ
JA
maximum junction temperature +175°C
5 lead SOT23 256°C/W
storage temperature range -65°C to +150°C
lead temperature (10 sec) +260°C
operating temperature range (recommended) -40°C to +85°C
input voltage range +V
s
+0.5V; -Vs -0.5V
internal power dissipation see power derating curves
KM4112 Electrical Characteristics
(Vs= +2.7V, G = 2, RL= 10kΩ to Vs/2, Rf= 10kΩ; unless noted)
KM4112 DATA SHEET
REV. 2 July 2001 3
PARAMETERS CONDITIONS TYP MIN & MAX UNITS NOTES
Case Temperature +25°C +25°C
Frequency Domain Response
-3dB bandwidth G = +1, Vo= 0.05V
pp
7.3 MHz 1
G = +2, Vo< 0.2V
pp
3.4 MHz
full power bandwidth G = -1, Vo= 2V
pp
2.5 MHz
gain bandwidth product 4 MHz
Time Domain Response
rise and fall time 0.2V step 50 ns
settling time to 0.1% 2V step 600 ns
overshoot 2V step, 4 %
slew rate 2V step, G = -1 9 V/µs
Distortion and Noise Response
2nd harmonic distortion 2Vpp, 100kHz 67 dBc
3rd harmonic distortion 2Vpp, 100kHz 56 dBc
THD 2Vpp, 100kHz 55 dB
input voltage noise >10kHz 29 nV/√Hz
DC Performance
input offset voltage 1 ±5 mV 2
average drift 8 µV/°C
input bias current 90 250 nA 2
average drift 100 pA/°C
input offset current 1.3 100 nA 2
power supply rejection ratio DC 63 58 dB 2
open loop gain 76 65 dB 2
quiescent current 70 100 µA2
Input Characteristics
input resistance >10 MΩ
input capacitance 1.6 pF
input common mode voltage range -0.3 to 3.8 V
common mode rejection ratio DC, Vcm= 0V to Vs- 1.5 97 68 dB 2
Output Characteristics
output voltage swing RL= 10kΩ to Vs/2 0.04 to 4.96 0.15 to 4.85 V 2
RL= 2kΩ to Vs/2 0.09 to 4.9 V
linear output current ±4 mA
short circuit output current ±9 mA
power supply operating range 5 2.5 to 5.5 V
Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels
are determined from tested parameters.
NOTES:
1) For G = +1, Rf= 0.
2) 100% tested at +25°C.
KM4112 Electrical Characteristics
(Vs= +5V, G = 2, RL= 10kΩ to Vs/2, Rf= 10kΩ; unless noted)
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