Fairchild Semiconductor KM4121, KM4111 Datasheet
Features
■
208µA supply current
■
35MHz bandwidth
■
Power down to Is= 35µA (KM4121)
■
Fully specified at +2.7V and +5V supplies
■
Output voltage range: 0.08V to 4.88V; Vs= +5
■
Input voltage range: -0.3V to +3.8V; Vs= +5
■
27V/µs slew rate
■
±8.5mA linear output current
■
±13mA short circuit output current
■
21nV/√Hz input voltage noise
■
Directly replaces MAX4281
■
Small package options (SOT23-5 and SOT23-6)
Applications
■
Portable/battery-powered applications
■
A/D buffer
■
Active filters
■
Signal conditioning
■
Portable test instruments
General Description
The KM4111 (single) and KM4121 (single with disable)
are ultra-low power, low cost, voltage feedback
amplifiers. These amplifiers use only 208µA of supply
current and are 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 KM4111 offers high bipolar performance at a
low CMOS price. The KM4111 offers superior dynamic
performance with a 35MHz small signal bandwidth
and 27V/µs slew rate. The combination of lowpower,
high bandwidth, and rail-to-rail performance make
the KM4111 well suited for battery-powered communication/computing systems.
KM4111/KM4121
0.2mA, Low Cost, +2.7V & +5V, 35MHz Rail-to-Rail Amplifiers
www.fairchildsemi.com
REV. 1B June 2001
KM4111/KM4121 Packages
SOT23-5 (KM4111)
SOT23-6 (KM4121)
Non-Inverting Freq. Response Vs = +5V
G = 2
1
Out
-V
2
s
3
+In
1
Out
-V
2
s
3
+In
+V
5
s
-
+
4
-In
+V
6
s
DIS
5
-
+
4
-In
Normalized Magnitude (2dB/div)
0.1
1
Frequency (MHz)
10
100
DATA SHEET KM4111/KM4121
2 REV. 1B June 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
28 MHz 1
G = +2, Vo< 0.2V
pp
15 MHz
full power bandwidth G = -1, Vo= 2V
pp
7 MHz
gain bandwidth product 16 MHz
Time Domain Response
rise and fall time 0.2V step 16 ns
settling time to 0.1% 1V step 140 ns
overshoot 2V step, G = -1 1 %
slew rate 2V step, G = -1 20 V/µs
Distortion and Noise Response
2nd harmonic distortion 1Vpp, 100kHz 85 dBc
3rd harmonic distortion 1Vpp, 100kHz 63 dBc
THD 1Vpp, 100kHz 62 dB
input voltage noise >10kHz 23 nV/√Hz
DC Performance
input offset voltage 0.8 ±5 mV 2
average drift 11 µV/°C
input bias current 0.37 1.3 µA2
average drift 1 nA/°C
input offset current 8 130 nA 2
power supply rejection ratio DC 60 56 dB 2
open loop gain 65 56 dB 2
quiescent current 185 245 µA2
Disable Characteristics
turn on time 1 µs
turn off time 3.5 µs
off isolation 1MHz 74 dB
quiescent current 13 µA
Input Characteristics
input resistance >10 MΩ
input capacitance 1.4 pF
input common mode voltage range -0.3 to 1.5 V
common mode rejection ratio DC, Vcm= 0V to Vs- 1.5 92 65 dB 2
Output Characteristics
output voltage swing RL= 10kΩ to Vs/2 0.06 to 2.62 V
RL= 2kΩ to Vs/2 0.08 to 2.6 0.2 to 2.4 V 2
linear output current ±8 mA
short circuit output current ±12.5 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
6 lead SOT23 230°C/W
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
KM4111/KM4121 Electrical Characteristics
(Vs= +2.7V, G = 2, RL= 2kΩ to Vs/2, Rf= 2.5kΩ; unless noted)
KM4111/KM4121 DATA SHEET
REV. 1B June 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
35 MHz 1
G = +2, Vo< 0.2V
pp
18 MHz
full power bandwidth G = -1, Vo= 2V
pp
8 MHz
gain bandwidth product 20 MHz
Time Domain Response
rise and fall time 0.2V step 13 ns
settling time to 0.1% 2V step 140 ns
overshoot 2V step, G = -1 1 %
slew rate 2V step, G = -1 27 V/µs
Distortion and Noise Response
2nd harmonic distortion 2Vpp, 100kHz 78 dBc
3rd harmonic distortion 2Vpp, 100kHz 66 dBc
THD 2Vpp, 100kHz 65 dB
input voltage noise >10kHz 21 nV/√Hz
DC Performance
input offset voltage -1.5 ±5 mV 2
average drift 20 µV/°C
input bias current 0.37 1.3 µA2
average drift 1 nA/°C
input offset current 7 130 nA 2
power supply rejection ratio DC 60 56 dB 2
open loop gain 62 56 dB 2
quiescent current 208 260 µA2
Disable Characteristics
turn on time 0.7 µs
turn off time 4.5 µs
off isolation 1MHz 72 dB
quiescent current 35 µA
Input Characteristics
input resistance >10 MΩ
input capacitance 1.2 pF
input common mode voltage range -0.3 to 3.8 V
common mode rejection ratio DC, Vcm= 0V to Vs- 1.5 95 65 dB 2
Output Characteristics
output voltage swing RL= 10kΩ to Vs/2 0.08 to 4.88 V
RL= 2kΩ to Vs/2 0.1 to 4.8 0.2 to 4.7 V 2
linear output current ±8.5 mA
short circuit output current ±13 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.
KM4111/KM4121 Electrical Characteristics
(Vs= +5V, G = 2, RL= 2kΩ to Vs/2, Rf= 2.5kΩ; unless noted)
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