1
FN7008.1
EL2228
Dual Low Noise Amplifier
The EL2228 is a dual, low-noise amplifier, ideally suited to
filtering applications in ADSL and HDSLII designs. It features
low noise specification of just 4.9nV/
Hz and 1.2pA/
Hz,
making it ideal for processing low voltage waveforms.
The EL2228 has a -3dB bandwidth of 80MHz and is gain-of-
1 stable. 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 EL2228 is available in a space saving 8-pin MSOP
package as well as the industry-standard 8-pin SO. It is
specified for operation over the -40C to +85C temperature
range.
Ordering Information
PART
NUMBER
PACKAGE
TAPE &
REEL
PKG. DWG. #
EL2228CY
8-Pin MSOP
-
MDP0043
EL2228CY-T13
8-Pin MSOP
13"
MDP0043
EL2228CY-T7
8-Pin MSOP
7"
MDP0043
EL2228CYZ
(See Note)
8-Pin MSOP
(Pb-free)
-
MDP0043
EL2228CYZ-T13
(See Note)
8-Pin MSOP
(Pb-free)
13"
MDP0043
EL2228CYZ-T7
(See Note)
8-Pin MSOP
(Pb-free)
7"
MDP0043
EL2228CS
8-Pin SO
-
MDP0027
EL2228CS-T13
8-Pin SO
13"
MDP0027
EL2228CS-T7
8-Pin SO
7"
MDP0027
EL2228CSZ
(See Note)
8-Pin SO
(Pb-free)
-
MDP0027
EL2228CSZ-T13
(See Note)
8-Pin SO
(Pb-free)
13"
MDP0027
EL2228CSZ-T7
(See Note)
8-Pin SO
(Pb-free)
7"
MDP0027
NOTE: Intersil Pb-free products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and compatible with
both SnPb and Pb-free soldering operations. Intersil Pb-free products
are MSL classified at Pb-free peak reflow temperatures that meet or
exceed the Pb-free requirements of IPC/JEDEC J STD-020.
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
Pb-Free available (RoHS compliant)
Applications
ADSL filters
HDSLII filters
Ultrasound input amplifiers
Wideband instrumentation
Communications equipment
Wideband sensors
Pinout
EL2228
(8-PIN SO, MSOP)
TOP VIEW
1
2
3
4
8
7
6
5
-
+
-
+
VS-
VS+
VINA+
VINA-
VOUTA
VOUTB
VINB-
VINB+
Data Sheet
April 6, 2005
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2002, 2003, 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Absolute Maximum Ratings
(T
A
= 25C)
Supply Voltage between V
S
+ and V
S
- . . . . . . . . . . . . . . . . . . . .+28V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . V
S
- - 0.3V, V
S
+0.3V
Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . 40mA
ESD Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2kV
Maximum Die Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . +150C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . -65C to +150C
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . .-40C to +85C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
2
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 Specifications
V
S
+ = +12V, V
S
- = -12V, R
L
= 500
and C
L
= 3pF to 0V, R
F
= 420
and T
A
= 25C unless otherwise specified.
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
INPUT CHARACTERISTICS
V
OS
Input Offset Voltage
V
CM
= 0V
0.2
3
mV
TCV
OS
Average Offset Voltage Drift
Measured over operating temperature range
-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 (Note 1)
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
NOTE:
Slew rate is measured on rising and falling edges
1.
EL2228
Electrical Specifications
V
S
+ = +5V, V
S
- = -5V, R
L
= 500
and C
L
= 3pF to 0V, R
F
= 420
and T
A
= 25
C unless otherwise specified.
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
INPUT CHARACTERISTICS
V
OS
Input Offset Voltage
V
CM
= 0V
0.6
3
mV
TCV
OS
Average Offset Voltage Drift
Measured over operating temperature range
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 (Note 1)
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
3
NOTE:
1. Slew rate is measured on rising and falling edges
EL2228
Non-Inverting Frequency Response for Various R
F
4
3
2
1
0
-1
-2
-3
-4
-5
-6
100k
1M
Frequency (Hz)
Norma
liz
e
d
Gai
n
(d
B)
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
li
z
e
d
Ga
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)
Norma
liz
e
d
Gai
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
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)
Phas
e ()
V
S
=12
V
R
F
=420
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)
Phas
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
Non-Inverting Frequency Response for Various
Input Signal Levels
4
3
2
1
0
-1
-2
-3
-4
-5
-6
100k
1M
Frequency (Hz)
Norma
liz
ed Gai
n
(dB)
100M
Non-Inverting Frequency Response for Various R
L
4
3
2
1
0
-1
-2
-3
-4
-5
-6
100k
1M
Frequency (Hz)
Norma
liz
ed Gai
n
(dB)
100M
10M
V
S
= 12V
A
V
= +1
R
F
= 420
10M
R
L
= 150
R
L
= 500
R
L
= 50
R
L
= 1k
V
IN
= 100mV
PP
V
IN
= 1V
PP
V
IN
= 500mV
PP
V
IN
= 2V
PP
V
S
= 12V
R
F
= 420
R
L
= 500
A
V
= +1
Non-Inverting Frequency Response (Gain)
4
3
2
1
0
-1
-2
-3
-4
-5
-6
100k
1M
10M
Frequency (Hz)
Norma
liz
e
d
Ga
in (dB
)
V
S
=12V
R
F
=420
R
L
=500
100M
A
V
= 1
A
V
= 2
A
V
= 5
A
V
= 10
Non-Inverting Frequency Response (Phase)
135
90
45
0
-45
-90
-135
-180
-225
-270
-315
100k
1M
10M
Frequency (Hz)
Phas
e ()
V
S
= 12V
R
F
= 420
R
L
= 500
100M
A
V
= 1
A
V
= 2
A
V
= 5
A
V
= 10
4
Typical Performance Curves
EL2228
Non-Inverting Frequency Response for Various C
L
4
3
2
1
0
-1
-2
-3
-4
-5
-6
100k
1M
10M
Frequency (Hz)
Norma
liz
e
d
Gai
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)
Norma
liz
e
d
Gai
n
(d
B)
100M
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
=
-3dB Bandwidth vs Supply Voltage for Non-
inverting Gains
80
60
40
20
0
2.5
4.5
8.5
Supply Voltage (V)
-3
dB Band
width (MHz)
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
dB Band
width (MHz)
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
Peaking vs Supply Voltage for Non-inverting
Gains
1
0.8
0.6
0.4
0.2
0
2.5
4.5
Supply Voltage (V)
P
e
aki
ng (dB
)
12.5
Peaking vs Supply Voltage for Inverting Gains
0.2
0.16
0.12
0.08
0.04
0
Supply Voltage (V)
P
e
aki
ng (dB
)
8.5
6.5
10.5
V
S
= 12V
R
F
= 420
R
L
= 500
A
V
= +1
G = 1
G = 2
G = 10
V
S
= 12V
R
F
= 420
R
L
= 500
A
V
= +1
G = -1
2.5
8.5
4.5
10.5
6.5
12.5
G = -2
G = -10
Small Signal Step Response
V
S
= 12V
Small Signal Step Response
V
S
= 2.5V
50ns/div
20mV/div
50ns/div
20mV/div
V
O
= +5
R
F
= 420
A
V
= 1
R
L
= 500
R
F
= 420
A
V
= 1
R
L
= 500
5
Typical Performance Curves
(Continued)
EL2228
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