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Non-Inverting Freq. Response V
s
= +5V
Normalized Magnitude (2dB/div)
Frequency (MHz)
0.1
1
10
100
G = 2
Features
I
208
A supply current
I
35MHz bandwidth
I
Power down to I
s
= 35
A (KM4121)
I
Fully specified at +2.7V and +5V supplies
I
Output voltage range: 0.08V to 4.88V; V
s
= +5
I
Input voltage range: -0.3V to +3.8V; V
s
= +5
I
27V/
s slew rate
I
8.5mA linear output current
I
13mA short circuit output current
I
21nV/
Hz input voltage noise
I
Directly replaces MAX4281
I
Small package options (SOT23-5 and SOT23-6)
Applications
I
Portable/battery-powered applications
I
A/D buffer
I
Active filters
I
Signal conditioning
I
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 208
A 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/
s slew rate. The combination of lowpower,
high bandwidth, and rail-to-rail performance make
the KM4111 well suited for battery-powered commu-
nication/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
-
+
1
2
3
Out
-V
s
+In
+V
s
-In
5
4
-
+
1
2
3
Out
-V
s
+In
+V
s
-In
6
4
5
DIS
SOT23-5 (KM4111)
SOT23-6 (KM4121)
DATA SHEET
KM4111/KM4121
2
REV. 1B June 2001
PARAMETERS
CONDITIONS
TYP
MIN & MAX
UNITS
NOTES
Case Temperature
+25C
+25C
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/
s
Distortion and Noise Response
2nd harmonic distortion
1V
pp
, 100kHz
85
dBc
3rd harmonic distortion
1V
pp
, 100kHz
63
dBc
THD
1V
pp
, 100kHz
62
dB
input voltage noise
>10kHz
23
nV/
Hz
DC Performance
input offset voltage
0.8
5
mV
2
average drift
11
V/C
input bias current
0.37
1.3
A
2
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
A
2
Disable Characteristics
turn on time
1
s
turn off time
3.5
s
off isolation
1MHz
74
dB
quiescent current
13
A
Input Characteristics
input resistance
>10
M
input capacitance
1.4
pF
input common mode voltage range
-0.3 to 1.5
V
common mode rejection ratio
DC, V
cm
= 0V to V
s
- 1.5
92
65
dB
2
Output Characteristics
output voltage swing
R
L
= 10k
to V
s
/2
0.06 to 2.62
V
R
L
= 2k
to V
s
/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 +25C.
Absolute Maximum Ratings
Package Thermal Resistance
supply voltage
0 to +6V
Package
JA
maximum junction temperature
+175C
5 lead SOT23
256C/W
storage temperature range
-65C to +150C
6 lead SOT23
230C/W
lead temperature (10 sec)
+260C
operating temperature range (recommended) -40C to +85C
input voltage range
+V
s
+0.5V; -V
s
-0.5V
internal power dissipation
see power derating curves
KM4111/KM4121 Electrical Characteristics
(V
s
= +2.7V, G = 2, R
L
= 2k
to V
s
/2, R
f
= 2.5k
; unless noted)
KM4111/KM4121
DATA SHEET
REV. 1B June 2001
3
PARAMETERS
CONDITIONS
TYP
MIN & MAX
UNITS
NOTES
Case Temperature
+25C
+25C
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/
s
Distortion and Noise Response
2nd harmonic distortion
2V
pp
, 100kHz
78
dBc
3rd harmonic distortion
2V
pp
, 100kHz
66
dBc
THD
2V
pp
, 100kHz
65
dB
input voltage noise
>10kHz
21
nV/
Hz
DC Performance
input offset voltage
-1.5
5
mV
2
average drift
20
V/C
input bias current
0.37
1.3
A
2
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
A
2
Disable Characteristics
turn on time
0.7
s
turn off time
4.5
s
off isolation
1MHz
72
dB
quiescent current
35
A
Input Characteristics
input resistance
>10
M
input capacitance
1.2
pF
input common mode voltage range
-0.3 to 3.8
V
common mode rejection ratio
DC, V
cm
= 0V to V
s
- 1.5
95
65
dB
2
Output Characteristics
output voltage swing
R
L
= 10k
to V
s
/2
0.08 to 4.88
V
R
L
= 2k
to V
s
/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 +25C.
KM4111/KM4121 Electrical Characteristics
(V
s
= +5V, G = 2, R
L
= 2k
to V
s
/2, R
f
= 2.5k
; unless noted)
4
REV. 1B June 2001
KM4111/KM4121 Performance Characteristics
(V
s
= +5V, G = 2, R
L
= 2k
to V
s
/2, R
f
= 2.5k
; unless noted)
Non-Inverting Frequency Response V
s
= +5V
Normalized Magnitude (2dB/div)
Frequency (MHz)
0.1
1
G = 10
10
100
G = 5
G = 1
R
f
= 0
G = 2
Inverting Frequency Response V
s
= +5V
Normalized Magnitude (1dB/div)
Frequency (MHz)
0.1
1
G = -10
10
100
G = -5
G = -2
G = -1
Non-Inverting Freq. Response V
s
= +2.7V
Normalized Magnitude (2dB/div)
Frequency (MHz)
0.1
1
G = 10
10
100
G = 5
G = 2
G = 1
R
f
= 0
Inverting Frequency Response V
s
= +2.7V
Normalized Magnitude (1dB/div)
Frequency (MHz)
0.1
1
G = -10
10
100
G = -5
G = -1
G = -2
Large Signal Frequency Response
Magnitude (1dB/div)
Frequency (MHz)
0.1
1
10
100
V
o
= 1V
pp
V
o
= 2V
pp
Open Loop Gain & Phase vs. Frequency
Open Loop Gain (dB)
Frequency (Hz)
10
100
1k
1M
100k
10k
10M
-20
0
20
100
40
80
60
Open Loop
Ph
a
s
e (de
g
)
-200
-160
-120
40
-80
0
-40
|Gain|
Phase
Input Voltage Noise
Voltage Noise (nV/
Hz)
Frequency (Hz)
100
1k
10k
1M
0
20
40
60
80
100
100k
2nd & 3rd Harmonic Distortion; V
s
= +5V
Distortion (dBc)
Frequency (kHz)
10
100
3rd
1000
2nd
-100
-90
-80
-70
-60
-50
-40
V
o
= 2V
pp
DATA SHEET
KM4111/KM4121
KM4111/KM4121
DATA SHEET
KM4111/KM4121 Performance Characteristics
(V
s
= +5V, G = 2, R
L
= 2k
to V
s
/2, R
f
= 2.5k
; unless noted)
2nd & 3rd Harmonic Distortion; V
s
= +2.7V
Distortion (dBc)
Frequency (kHz)
10
100
3rd
1000
2nd
-100
-90
-80
-70
-60
-50
-40
V
o
= 1V
pp
PSRR
PSRR (dB)
Frequency (Hz)
100
1k
10k
1M
100k
10M
-70
-60
-50
-40
-30
10
-20
-10
0
CMRR
CMRR (dB)
Frequency (Hz)
10
100
1k
1M
100k
10k
10M
-100
-90
-80
-70
-20
-60
-50
-30
-40
Output Swing vs. R
L
Output Swing (V
pp
)
R
L
(k
)
1
10
100
4.55
4.60
4.70
4.85
4.75
4.80
4.65
Small Signal Pulse Response V
s
= +5V
Output Voltage (0.05V/div)
Time (1
s/div)
Large Signal Pulse Response V
s
= +5V
Output Voltage (0.5V/div)
Time (1
s/div)
Enable Disable Response V
s
= +5V
Output Voltage (0.1V/div)
Time (1
s/div)
Disable Pulse
5V
0V
KM4111/KM4121
DATA SHEET
REV. 1B June 2001
5
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