Features
I
70
A supply current
I
7.3MHz bandwidth
I
Fully specified at +2.7V and +5V supplies
I
Output voltage range: 0.04V to 4.96V; Vs = +5
I
Input voltage range: -0.3V to +3.8V; Vs = +5
I
9V/
s slew rate
I
4mA linear output current
I
9mA short circuit output current
I
29nV/
Hz input voltage noise
I
Competes with low power CMOS amps
I
Small package options (SOIC-8 and MSOP-8)
Applications
I
Portable/battery-powered applications
I
A/D buffer
I
Active filters
I
Signal conditioning
I
Portable test instruments
General Description
The KM4212 is an ultra-low power, low cost, voltage
feedback amplifier. The KM4212 uses only 70
A 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 KM4212 offers high bipolar performance at a low
CMOS price. The KM4212 offers superior dynamic
performance with a 7.3MHz small signal bandwidth
and 9V/
s slew rate. The combination of low power,
high bandwidth, and rail-to-rail performance make
the KM4212 well suited for battery-powered commu-
nication/computing systems.
The KM4112 single amplifier is also available.
KM4212
Dual, 70
A, Low Cost, +2.7V & +5V, 7.3MHz Rail-to-Rail Amp
www.fairchildsemi.com
REV. 1 August 2001
Non-Inverting Freq. Response V
s
= +5V
Normalized Magnitude (2dB/div)
Frequency (MHz)
0.01
0.1
1
10
G = 2
R
f
= 10k
KM4212 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
KM4212
2
REV. 1 August 2001
PARAMETERS
CONDITIONS
TYP
MIN & MAX
UNITS
NOTES
Case Temperature
+25C
+25C
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/
s
Distortion and Noise Response
2nd harmonic distortion
1V
pp
, 100kHz
68
dBc
3rd harmonic distortion
1V
pp
, 100kHz
65
dBc
THD
1V
pp
, 100kHz
63
dB
input voltage noise
>10kHz
30
nV/
Hz
crosstalk
0.01MHz
89
dB
DC Performance
input offset voltage
1
5
mV
2
average drift
3
V/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
A
2
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
95
68
dB
2
Output Characteristics
output voltage swing
R
L
= 10k
to V
s
/2
0.035 to 2.665 0.15 to 2.55
V
2
R
L
= 2k
to V
s
/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 +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
KM4212 Electrical Characteristics
(V
s
= +2.7V, G = 2, R
L
= 10k
to V
s
/2, R
f
= 10k
; unless noted)
KM4212
DATA SHEET
REV. 1 August 2001
3
PARAMETERS
CONDITIONS
TYP
MIN & MAX
UNITS
NOTES
Case Temperature
+25C
+25C
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/
s
Distortion and Noise Response
2nd harmonic distortion
2V
pp
, 100kHz
67
dBc
3rd harmonic distortion
2V
pp
, 100kHz
60
dBc
THD
2V
pp
, 100kHz
59
dB
input voltage noise
>10kHz
29
nV/
Hz
crosstalk
0.01MHz
89
dB
DC Performance
input offset voltage
1
mV
average drift
8
V/C
input bias current
90
nA
average drift
100
pA/C
input offset current
1.3
nA
power supply rejection ratio
DC
63
dB
open loop gain
76
dB
quiescent current
70
A
Input Characteristics
input resistance
>10
M
input capacitance
1.25
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
97
dB
Output Characteristics
output voltage swing
R
L
= 10k
to V
s
/2
0.04 to 4.96
V
R
L
= 2k
to V
s
/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.
KM4212 Electrical Characteristics
(V
s
= +5V, G = 2, R
L
= 10k
to V
s
/2, R
f
= 10k
; unless noted)
4
REV. 1 August 2001
KM4212 Performance Characteristics
(V
s
= +5V, G = 2, R
L
= 10k
to V
s
/2, R
f
= 10k
; unless noted)
Non-Inverting Frequency Response V
s
= +5V
Normalized Magnitude (2dB/div)
Frequency (MHz)
0.01
0.1
G = 10
1
10
G = 5
G = 1
G = 2
Inverting Frequency Response V
s
= +5V
Normalized Magnitude (1dB/div)
Frequency (MHz)
0.01
0.1
G = -10
1
10
G = -5
G = -2
G = -1
Non-Inverting Freq. Response V
s
= +2.7V
Normalized Magnitude (2dB/div)
Frequency (MHz)
0.01
0.1
G = 10
1
10
G = 5
G = 1
G = 2
Inverting Frequency Response V
s
= +2.7V
Normalized Magnitude (1dB/div)
Frequency (MHz)
0.01
0.1
G = -10
1
10
G = -5
G = -1
G = -2
Large Signal Frequency Response
Magnitude (1dB/div)
Frequency (MHz)
0.01
0.1
1
10
V
o
= 1V
pp
V
o
= 2V
pp
Open Loop Gain & Phase vs. Frequency
Open Loop Gain (dB)
Frequency (Hz)
1
10
100
100k
10k
1k
1M
-10
0
10
20
80
30
40
70
50
60
Open Loop
Ph
a
s
e (de
g
)
-180
-160
-140
-120
0
-100
-80
-20
-60
-40
|Gain|
Phase
Input Voltage Noise
Voltage Noise (nV/
Hz)
Frequency (MHz)
0.0001
0.001
0.01
0.1
1.0
10
0
40
20
60
80
100
120
140
2nd & 3rd Harmonic Distortion; V
s
= +5V
Distortion (dBc)
Frequency (kHz)
10
100
3rd
1000
2nd
-90
-80
-70
-60
-50
-40
-30
-20
V
o
= 2V
pp
DATA SHEET
KM4212
KM4212
DATA SHEET
KM4212 Performance Characteristics
(V
s
= +5V, G = 2, R
L
= 10k
to V
s
/2, R
f
= 10k
; unless noted)
2nd & 3rd Harmonic Distortion; V
s
= +2.7V
Distortion (dBc)
Frequency (kHz)
10
100
3rd
1000
2nd
-90
-80
-70
-60
-50
-40
-30
-20
V
o
= 1V
pp
PSRR
PSRR (dB)
Frequency (Hz)
1
10
100
100k
10k
1k
1M
-80
-70
-60
-50
-40
0
-30
-20
-10
CMRR
CMRR (dB)
Frequency (Hz)
1
10
100
100k
10k
1k
1M
-100
-90
-80
-70
-60
0
-50
-40
-10
-30
-20
Output Swing vs. R
L
Output Swing (V
pp
)
R
L
(k
)
1
10
100
4.70
4.75
4.80
4.95
4.85
4.90
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
1.0
10
-95
-80
-75
-60
-85
-90
-70
-65
SOIC
MSOP
REV. 1 August 2001
5
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