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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
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 OPA2350, MAX4132, MAX4281
I
Small package options (SOIC-8 and MSOP-8)
Applications
I
A/D buffer
I
Smart card readers
I
Active filters
I
Keyless entry
I
Signal conditioning
I
ASCI input devices
I
Portable test instruments
I
PCMUA cards
I
Portable communications
I
Bar-code readers
I
Portable/battery-powered applications
General Description
The KM4211 is a dual ultra-low power, low cost,
voltage feedback amplifier. The KM4211 uses only
208
A of supply current per amplifier and is designed
to operate from 2.5V to 5.5V or 1.25V to 2.75V
supplies. The input voltage range extends 300mV below
the negative rail and 1.2V below the positive rail.
The KM4211 offers high bipolar performance at a
low CMOS price. The KM4211 offers superior
dynamic performance with a 35MHz small signal
bandwidth and 27V/
s slew rate. The combination
of low power, high bandwidth, and rail-to-rail
performance make the KM4211 well suited for
battery-powered communication/computing systems.
The KM4112 (single) and KM4121 (single with disable)
are also available.
KM4211
Dual, 0.2mA, Low Cost, +2.7V & +5V, 35MHz Rail-to-Rail Amp
www.fairchildsemi.com
REV. 1 June 2001
KM4211 Packages
-
+
-
+
1
2
3
4
Out1
-In1
+In1
-V
s
+V
s
Out2
-In2
+In2
8
7
6
5
SOIC-8
-
+
-
+
1
2
3
4
Out1
-In1
+In1
-V
s
+V
s
Out2
-In2
+In2
8
7
6
5
MSOP-8
DATA SHEET
KM4211
2
REV. 1 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
20
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
crosstalk
100kHz, Vo = 0.2V
pp
98
dB
DC Performance
input offset voltage
0.8
5
mV
2
average drift
11
V/C
input bias current
0.4
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
Input Characteristics
input resistance
>10
M
input capacitance
1.5
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
8 lead SOIC
152C/W
storage temperature range
-65C to +150C
8 lead MSOP
206C/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
KM4211 Electrical Characteristics
(V
s
= +2.7V, G = 2, R
L
= 2k
to V
s
/2, R
f
= 2.5k
; unless noted)
KM4211
DATA SHEET
REV. 1 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
18
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
crosstalk
100kHz, Vo = 0.2V
pp
98
dB
DC Performance
input offset voltage
-1.5
mV
average drift
20
V/C
input bias current
0.4
A
average drift
1
nA/C
input offset current
7
nA
power supply rejection ratio
DC
60
dB
open loop gain
62
dB
quiescent current
208
A
Input Characteristics
input resistance
>10
M
input capacitance
1.35
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
85
dB
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
V
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.
KM4211 Electrical Characteristics
(V
s
= +2.7V, G = 2, R
L
= 2k
to V
s
/2, R
f
= 2.5k
; unless noted)
4
REV. 1 June 2001
KM4211 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
KM4211
KM4211
DATA SHEET
KM4211 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)
Crosstalk vs. Frequency
Crosstalk (dB)
Frequency (MHz)
0.01
0.1
1
10
-105
-100
-95
-90
-65
-85
-80
-70
-75
KM4211
DATA SHEET
REV. 1 June 2001
5
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