Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a "controlled document". Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
2001 Elantec Semiconductor, Inc.
E
L
2
2
2
8
C
-
P
r
e
l
i
m
i
n
a
r
y
General Description
The EL2228C is a dual, low-noise amplifier, ideally suited to filtering
applications in ADSL and HDSLII designs. It feature low noise speci-
fication of just 4.9nV/
Hz and 1.2pA/
Hz, making it ideal for
processing low voltage waveforms.
The EL2228C has a -3dB bandwidth of 80MHz and is gain-of-1 sta-
ble. It also affords minimal power dissipation with a supply current of
just 4.5mA per amplifier. The amplifier can be powered from supplies
ranging from 2.5V to 12V.
The EL2228C is available in a space saving 8-Pin MSOP package as
well as the industry standard 8-Pin SO. It can operate over the -40C to
+85C temperature range.
Connection Diagram
1
2
3
4
8
7
6
5
-
+
-
+
VS-
VS+
VINA+
VINA-
VOUTA
VOUTB
VINB-
VINB+
EL2228C
8-Pin SO and 8-Pin MSOP
Features
Voltage noise of only 4.9nV/
Hz
Current noise of only 1.2pA/
Hz
Bandwidth (-3dB) of 80MHz
-
@A
V
= +1
Gain-of-1 stable
Just 4.5mA per amplifier
8-pin MSOP package
2.5V to 12V operation
Applications
ADSL Filters
HDSLII Filters
Ultrasound input amplifiers
Wideband Instrumentation
Communications equipment
Wideband sensors
Ordering Information
Part No.
Temp. Range
Package
Outline #
EL2228CY
8-Pin MSOP
-
MDP0043
EL2228CY-T13
8-Pin MSOP
13"
MDP0043
EL2228CY-T7
8-Pin MSOP
7"
MDP0043
EL2228CS
8-Pin SO
-
MDP0027
EL2228CS-T13
8-Pin SO
13"
MDP0027
EL2228CS-T7
8-Pin SO
7"
MDP0027
EL2228C - Preliminary
Dual Low Noise Amplifier
S
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1
2
EL2228C - Preliminary
Dual Low Noise Amplifier
E
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8
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Absolute Maximum Ratings
(T
A
= 25C)
Values beyond absolute maximum ratings can cause the device to be pre-
maturely damaged. Absolute maximum ratings are stress ratings only
and functional device operation is not implied.
Supply Voltage between V
S
+ and V
S
-
+28V
Input Voltage
V
S
- - 0.3V, V
S
+0.3V
Maximum Continuous Output Current
40mA
Maximum Die Temperature
+125C
Storage Temperature
-65C to +150C
Operating Temperature
-40C to +85C
Lead Temperature
260C
Power Dissipation
See Curves
ESD Voltage
2kV
Important Note:
All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are at the
specified temperature and are pulsed tests, therefore: T
J
= T
C
= T
A
Electrical Characteristics
V
S
+= +12V, V
S
- = -12V, R
L
= 500
and C
L
= 3pF to 0V, R
F
= 420
& T
A
= 25C unless otherwise specified.
Parameter
Description
Condition
Min
Typ
Max
Unit
Input Characteristics
V
OS
Input Offset Voltage
V
CM
= 0V
0.2
3
mV
TCV
OS
Average Offset Voltage Drift
[1]
-4
V/C
I
B
Input Bias Current
V
CM
= 0V
-9
-4.5
-1
A
R
IN
Input Impedance
8
M
C
IN
Input Capacitance
1
pF
CMIR
Common-Mode Input Range
-11.8
+10.4
V
CMRR
Common-Mode Rejection Ratio
for V
IN
from -11.8V to +10.4V
60
90
dB
for V
IN
from -10V to +10V
60
75
dB
A
VOL
Open-Loop Gain
-5V
V
OUT
5V
60
75
dB
e
n
Voltage Noise
f = 100kHz
4.9
nV/
Hz
i
n
Current Noise
f = 100kHz
1.2
pA/
Hz
Output Characteristics
V
OL
Output Swing Low
R
L
= 500
-10.3
-10
V
R
L
= 250
-9.5
-9
V
V
OH
Output Swing High
R
L
= 500
10
10.3
V
R
L
= 250
9.5
10
V
I
SC
Short Circuit Current
R
L
= 10
140
180
mA
Power Supply Performance
PSRR
Power Supply Rejection Ratio
V
S
is moved from 10.8V to 13.2V
65
83
dB
I
S
Supply Current (Per Amplifier)
No load
4
5
6
mA
Dynamic Performance
SR
Slew Rate
[2]
2.5V square wave, measured 25%-75%
44
65
V/s
t
S
Settling to +0.1% (A
V
= +1)
(A
V
= +1), V
O
= 2V step
50
ns
BW
-3dB Bandwidth
80
MHz
HD2
2nd Harmonic Distortion
f = 1MHz, V
O
= 2V
P-P
, R
L
= 500
, A
V
= 2
-86
dBc
f = 1MHz, V
O
= 2V
P-P
, R
L
= 150
, A
V
= 2
-79
dBc
HD3
3rd Harmonic Distortion
f = 1MHz, V
O
= 2V
P-P
, R
L
= 500
, A
V
= 2
-93
dBc
f = 1MHz, V
O
= 2V
P-P
, R
L
= 150
, A
V
= 2
-70
dBc
1. Measured over operating temperature range
2. Slew rate is measured on rising and falling edges
3
EL2228C - Preliminary
Dual Low Noise Amplifier
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Electrical Characteristics
V
S
+= +5V, V
S
- = -5V, R
L
= 500
and C
L
= 3pF to 0V, R
F
= 420
& T
A
= 25C unless otherwise specified.
Parameter
Description
Condition
Min
Typ
Max
Unit
Input Characteristics
V
OS
Input Offset Voltage
V
CM
= 0V
0.6
3
mV
TCV
OS
Average Offset Voltage Drift
[1]
4.9
V/C
I
B
Input Bias Current
V
CM
= 0V
-9
-4.5
-1
A
R
IN
Input Impedance
6
M
C
IN
Input Capacitance
1.2
pF
CMIR
Common-Mode Input Range
-4.7
+3.4
V
CMRR
Common-Mode Rejection Ratio
for V
IN
from -4.7V to +3.4V
60
90
dB
for V
IN
from -2V to +2V
dB
A
VOL
Open-Loop Gain
-2.5V
V
OUT
2.5V
60
72
dB
e
n
Voltage Noise
f = 100kHz
4.7
nV/
Hz
i
n
Current Noise
f = 100kHz
1.2
pA/
Hz
Output Characteristics
V
OL
Output Swing Low
R
L
= 500
-3.8
-3.5
V
R
L
= 250
-3.7
-3.5
V
V
OH
Output Swing High
R
L
= 500
3.5
3.7
V
R
L
= 250
3.5
3.6
V
I
SC
Short Circuit Current
R
L
= 10
60
100
mA
Power Supply Performance
PSRR
Power Supply Rejection Ratio
V
S
is moved from 4.5V to 5.5V
65
83
dB
I
S
Supply Current (Per Amplifier)
No load
3.5
4.5
5.5
mA
Dynamic Performance
SR
Slew Rate
[2]
2.5V square wave, measured 25%-75%
35
50
V/s
t
S
Settling to +0.1% (A
V
= +1)
(A
V
= +1), V
O
= 2V step
50
ns
BW
-3dB Bandwidth
75
MHz
HD2
2nd Harmonic Distortion
f = 1MHz, V
O
= 2V
P-P
, R
L
= 500
, A
V
= 2
-90
dBc
f = 1MHz, V
O
= 2V
P-P
, R
L
= 150
, A
V
= 2
-71
dBc
HD3
3rd Harmonic Distortion
f = 1MHz, V
O
= 2V
P-P
, R
L
= 500
, A
V
= 2
-99
dBc
f = 1MHz, V
O
= 2V
P-P
, R
L
= 150
, A
V
= 2
-69
dBc
1. Measured over operating temperature range
2. Slew rate is measured on rising and falling edges
4
EL2228C - Preliminary
Dual Low Noise Amplifier
E
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8
C
-
P
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Typical Performance Curves
Non-inverting Frequency Response for Various R
F
4
3
2
1
0
-1
-2
-3
-4
-5
-6
100k
1M
Frequency (Hz)
N
o
r
m
a
l
i
z
e
d
G
a
i
n
(
d
B
)
100M
Non-inverting Frequency Response (Gain)
4
3
2
1
0
-1
-2
-3
-4
-5
-6
100k
1M
10M
Frequency (Hz)
N
o
r
m
a
l
i
z
e
d
G
a
i
n
(
d
B
)
V
S
=12V
R
F
=420
R
L
=500
A
V
=+1
100M
Inverting Frequency Response (Gain)
4
3
2
1
0
-1
-2
-3
-4
-5
-6
100k
1M
10M
Frequency (Hz)
N
o
r
m
a
l
i
z
e
d
G
a
i
n
(
d
B
)
100M
Inverting Frequency Response for Various R
F
4
3
2
1
0
-1
-2
-3
-4
-5
-6
1M
10M
Frequency (Hz)
N
o
r
m
a
l
i
z
e
d
G
a
i
n
(
d
B
)
100M
10M
V
S
=12V
A
V
=+1
R
L
=500
R
F
=1k
R
F
=200
R
F
=420
R
F
=0
V
S
=12V
A
V
=-1
R
L
=500
R
F
=100
R
F
=420
R
F
=1k
A
V
=1
A
V
=2
A
V
=5
A
V
=10
V
S
=12V
R
F
=420
A
V
=-1
A
V
=-2
A
V
=-10
A
V
=-5
Non-inverting Frequency Response (Phase)
135
90
45
0
-45
-90
-135
-180
-225
-270
-315
100k
1M
10M
Frequency (Hz)
P
h
a
s
e
(
)
V
S
=12V
R
F
=420
R
L
=500
100M
A
V
=1
A
V
=2
A
V
=5
A
V
=10
Inverting Frequency Response (Phase)
135
45
0
-45
-90
-135
-180
-225
-270
-315
100k
Frequency (Hz)
P
h
a
s
e
(
)
90
10M
1M
100M
V
S
=12V
R
F
=420
R
L
=500
A
V
=-1
A
V
=-2
A
V
=-5
A
V
=-10
5
EL2228C - Preliminary
Dual Low Noise Amplifier
E
L
2
2
2
8
C
-
P
r
e
l
i
m
i
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a
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y
Typical Performance Curves
Non-inverting Frequency Response for Various
Input Signal Levels
4
3
2
1
0
-1
-2
-3
-4
-5
-6
100k
1M
Frequency (Hz)
N
o
r
m
a
l
i
z
e
d
G
a
i
n
(
d
B
)
100M
Non-inverting Frequency Response for Various C
L
4
3
2
1
0
-1
-2
-3
-4
-5
-6
100k
1M
10M
Frequency (Hz)
N
o
r
m
a
l
i
z
e
d
G
a
i
n
(
d
B
)
V
S
=12V
R
F
=420
R
L
=500
A
V
=+1
100M
Non-inverting Frequency Response for Various
Output DC Levels
4
3
2
1
0
-1
-2
-3
-4
-5
-6
100k
1M
10M
Frequency (Hz)
N
o
r
m
a
l
i
z
e
d
G
a
i
n
(
d
B
)
100M
Non-inverting Frequency Response for Various R
L
4
3
2
1
0
-1
-2
-3
-4
-5
-6
100k
1M
Frequency (Hz)
N
o
r
m
a
l
i
z
e
d
G
a
i
n
(
d
B
)
100M
10M
V
S
=12V
A
V
=+1
R
F
=420
10M
R
L
=150
R
L
=500
R
L
=50
R
L
=1k
C
L
=30pF
C
L
=3pF
C
L
=10pF
V
S
=12V
R
F
=420
R
L
=500
A
V
=+1
V
O
=+10
V
O
=0
V
O
=-10
V
O
=-5
V
O
=+5
V
IN
=100mV
PP
V
IN
=1V
PP
V
IN
=500mV
PP
V
IN
=2V
PP
-3dB Bandwidth vs Supply Voltage for Non-
inverting Gains
80
60
40
20
0
2.5
4.5
8.5
Supply Voltage (V)
-
3
d
B
B
a
n
d
w
i
d
t
h
(
M
H
z
)
12.5
V
S
=12V
R
F
=420
R
L
=500
A
V
=+1
6.5
10.5
G=1
G=2
G=5
G=10
-3dB Bandwidth vs Supply Voltage for Inverting
Gains
25
15
10
5
0
2.5
Supply Voltage (V)
-
3
d
B
B
a
n
d
w
i
d
t
h
(
M
H
z
)
20
8.5
4.5
12.5
V
S
=12V
R
F
=420
R
L
=500
A
V
=+1
G=-1
G=-2
G=-5
G=-10
10.5
6.5
V
S
=12V
R
F
=420
R
L
=500
A
V
=+1
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