Intersil EL2180CS-T7 250mhz/3ma current mode feedback amplifier Datasheet

EL2180, EL2280, EL2480
®
Data Sheet
November 14,2002
250MHz/3mA Current Mode Feedback
Amplifiers
The EL2180, EL2280, and EL2480 are
single, dual, and quad currentfeedback operational amplifiers which
achieve a -3dB bandwidth of 250MHz at a gain of +1 while
consuming only 3mA of supply current per amplifier. They
will operate with dual supplies ranging from ±1.5V to ±6V, or
from single supplies ranging from +3V to +12V. In spite of
their low supply current, the EL2480 and the EL2280 can
output 55mA while swinging to ±4V on ±5V supplies. The
EL2180 can output 100mA with similar output swings. These
attributes make the EL2180, EL2280, and EL2480 excellent
choices for low power and/or low voltage cable-driver, HDSL,
or RGB applications.
For applications where board space is extremely critical, the
EL2180 is available in the tiny 5-pin SOT-23 package, which
has a footprint 28% the size of an 8-pin SO.
For single, dual, and triple applications with disable, consider
the EL2186 (8-pin single), EL2286 (14-pin dual), or EL2386
(16-pin triple). For lower power applications where speed is
still a concern, consider the EL2170/EL2176 family which
also comes in similar single, dual, and quad configurations.
The EL2170/EL2176 family provides a -3dB bandwidth of
70MHz while consuming 1mA of supply current per amplifier.
PACKAGE
Features
• Single (EL2180), dual (EL2280), and quad (EL2480)
topologies
• 3mA supply current (per amplifier)
• 250MHz -3dB bandwidth
• Tiny SOT23-5 package (EL2180)
• Low cost
• Single- and dual-supply operation down to ±1.5V
• 0.05%/0.05° diff. gain/diff. phase into 150Ω
• 1200V/µs slew rate
• Large output drive current - 100mA (EL2180), 55mA
(EL2280), 55mA (EL2480)
• Also available with disable in single (EL2186), dual
(EL2286), and triple (EL2386)
• Lower power EL2170/EL2176 family available
(1mA/70MHz) in single, dual, and quad
Applications
• Low power/battery applications
• HDSL amplifiers
• Video amplifiers
• Cable drivers
Ordering Information
PART NUMBER
FN7055
TAPE & REEL PKG. NO.
• RGB amplifiers
EL2180CN
8-Pin PDIP
-
MDP0031
• Test equipment amplifiers
EL2180CS
8-Pin SO
-
MDP0027
• Current to voltage converters
EL2180CS-T7
8-Pin SO
7”
MDP0027
EL2180CS-T13
8-Pin SO
13”
MDP0027
EL2180CW-T7
5-Pin SOT-23*
7”
MDP0038
EL2180CW-T13
5-Pin SOT-23*
13”
MDP0038
EL2280CN
8-Pin PDIP
-
MDP0031
EL2280CS
8-Pin SO
-
MDP0027
EL2280CS-T7
8-Pin SO
7”
MDP0027
EL2280CS-T13
8-Pin SO
13”
MDP0027
EL2480CN
14-Pin PDIP
-
MDP0031
EL2480CS
14-Pin SO
-
MDP0027
EL2480CS-T7
14-Pin SO
7”
MDP0027
EL2480CS-T13
14-Pin SO
13”
MDP0027
NOTE:
*EL2180CW symbol is .Cxxx where xxx represents date code
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.
EL2180, EL2280, EL2480
Pinouts
EL2180
(8-PIN SO, PDIP)
TOP VIEW
EL2280
(8-PIN SO, PDIP)
TOP VIEW
EL2180
(5-PIN SOT 23)
TOP VIEW
EL2480
(14-PIN SO, PDIP)
TOP VIEW
2
EL2180, EL2280, EL2480
Absolute Maximum Ratings (TA = 25°C)
Supply Voltage between VS+ and GND. . . . . . . . . . . . . . . . . +12.6V
Voltage between VS+ and VS- . . . . . . . . . . . . . . . . . . . . . . . . +12.6V
Common-Mode Input Voltage . . . . . . . . . . . . . . . . . . . . . VS- to VS+
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±6V
Current into +IN or -IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±7.5mA
Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . See Curves
Operating Ambient Temperature Range . . . . . . . . . .-40°C to +85°C
Operating Junction Temperature
Plastic Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
Output Current (EL2180) . . . . . . . . . . . . . . . . . . . . . . . . . . . ±120mA
Output Current (EL2280) . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±60mA
Output Current (EL2480) . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±60mA
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C
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.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests
are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
DC Electrical Specifications
PARAMETER
VS = ±5V, RL = 150Ω, TA = 25°C unless otherwise specified
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
2.5
10
mV
VOS
Input Offset Voltage
TCVOS
Average Input Offset Voltage Drift
Measured from TMIN to TMAX
dVOS
VOS Matching
EL2280, EL2480 only
+IIN
+Input Current
d+IIN
+IIN Matching
-IIN
-Input Current
d-IIN
-IIN Matching
EL2280, EL2480 only
CMRR
Common Mode Rejection Ratio
VCM = ±3.5V
-ICMR
-Input Current Common Mode
Rejection
VCM = ±3.5V
PSRR
Power Supply Rejection Ratio
VS is moved from ±4V to ±6V
-IPSR
- Input Current Power Supply
Rejection
VS is moved from ±4V to ±6V
ROL
Transimpedance
VOUT = ±2.5V
120
300
kΩ
+RIN
+Input Resistance
VCM = ±3.5V
0.5
2
MΩ
+CIN
+Input Capacitance
1.2
pF
CMIR
Common Mode Input Range
±3.5
±4.0
V
VO
Output Voltage Swing
±3.5
±4.0
V
VS = 5 single-supply, high
4.0
V
VS = 5 single-supply, low
0.3
V
IO
IS
Output Current
Supply Current
3
5
µV/°C
0.5
mV
1.5
EL2280, EL2480 only
20
16
VS = ±5
15
45
nA
40
µA
2
µA
50
dB
5
60
µA
30
70
1
µA/V
dB
15
µA/V
EL2180 only
80
100
mA
EL2280 only, per amplifier
50
55
mA
EL2480 only, per amplifier
50
55
mA
Per amplifier
3
6
mA
EL2180, EL2280, EL2480
AC Electrical Specifications
VS = ±5V, RF = RG = 750Ω for PDIP and SO packages, RF = RG = 560Ω for SOT23-5 package,
RL = 150Ω, TA = 25°C unless otherwise specified
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
-3dB BW
-3dB Bandwidth
AV = 1
250
MHz
-3dB BW
-3dB Bandwidth
AV = 2
180
MHz
0.1dB BW
0.1dB Bandwidth
AV = 2
50
MHz
SR
Slew Rate
VOUT = ±2.5V, AV = 2
1200
V/µs
tR, tF
Rise and Fall Time
VOUT = ±500mV
1.5
ns
tPD
Propagation Delay
VOUT = ±500mV
1.5
ns
OS
Overshoot
VOUT = ±500mV
3.0
%
tS
0.1% Settling
VOUT = ±2.5V, AV = -1
15
ns
dG
Differential Gain
AV = 2, RL = 150Ω (Note 1)
0.05
%
dP
Differential Phase
AV = 2, RL = 150Ω (Note 1)
0.05
°
dG
Differential Gain
AV = 1, RL = 500Ω (Note 1)
0.01
%
dP
Differential Phase
AV = 1, RL = 500Ω (Note 1)
0.01
°
CS
Channel Separation
EL2280, EL2480 only, f = 5MHz
85
dB
NOTE:
1. DC offset from 0V to 0.714V, AC amplitude 286mVP-P, f = 3.58MHz
4
600
EL2180, EL2280, EL2480
Test Circuit (per Amplifier)
Simplified Schematic (per Amplifier)
5
EL2180, EL2280, EL2480
Typical Performance Curves
Non-Inverting Frequency
Response (Gain)
(PDIP and SO Packages)
Non–Inverting Frequency
Response (Phase)
(PDIP and SO Packages)
Inverting Frequency
Response (Gain)
(PDIP and SO Packages)
Inverting Frequency
Response (Phase)
(PDIP and SO Packages)
Frequency Response
for Various RF and RG
(PDIP and SO Packages)
Frequency Response
for Various RL and CL
(PDIP and SO Packages)
Ω
Transimpedance (ROL) vs
Frequency
6
PSRR and CMRR
vs Frequency
Frequency Response for
Various CIN-
EL2180, EL2280, EL2480
Typical Performance Curves (Continued)
Voltage and Current
Noise vs Frequency
2nd and 3rd Harmonic
Distortion vs Frequency
Output Voltage
Swing vs Frequency
-3dB Bandwidth and Peaking
vs Supply Voltage for
Various Non-Inverting Gains
-3dB Bandwidth and Peaking
vs Supply Voltage for
Various Inverting Gains
Output Voltage Swing
vs Supply Voltage
Supply Current vs Supply Voltage
Common-Mode Input Range
vs Supply Voltage
Slew Rate vs Supply Voltage
7
EL2180, EL2280, EL2480
Typical Performance Curves
(Continued)
Input Bias Current
vs Die Temperature
Short-Circuit Current
vs Die Temperature
Transimpedance (ROL)
vs Die Temperature
-3dB Bandwidth and Peaking
vs Die Temperature for
Various Non-Inverting Gains
-3dB Bandwidth vs
Die Temperature for
Various Inverting Gains
Input Offset Voltage
vs Die Temperature
Supply Current vs Die Temperature
Input Voltage Range
vs Die Temperature
Slew Rate vs Die Temperature
8
EL2180, EL2280, EL2480
Typical Performance Curves
(Continued)
Differential Gain and
Phase vs DC Input
Voltage at 3.58MHz
Small-Signal Step Response
5-Pin Plastic SOT-23
Maximum Power Dissipation
vs Ambient Temperature
9
Differential Gain and
Phase vs DC Input
Voltage at 3.58MHz
Settling Time vs
Settling Accuracy
Large-Signal Step Response
8-Pin Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
8-Pin SO
Maximum Power Dissipation
vs Ambient Temperature
EL2180, EL2280, EL2480
Typical Performance Curves (Continued)
14-Pin Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
Non-Inverting Frequency
Response (Gain)
(SOT23-5 Package)
Inverting Frequency
Response (Gain)
(SOT23-5 Package)
10
14-Pin SO
Maximum Power Dissipation
vs Ambient Temperature
Non-Inverting Frequency
Response (Phase)
(SOT23-5 Package)
Channel Separation
vs Frequency
Frequency Response for
Various RF and RG
(SOT23-5 Package)
Inverting Frequency
Response (Phase)
(SOT23-5 Package)
EL2180, EL2280, EL2480
Applications Information
Product Description
The EL2180, EL2280, and EL2480 are current-feedback
operational amplifiers that offer a wide -3dB bandwidth of
250MHz and a low supply current of 3mA per amplifier. All of
these products also feature high output current drive. The
EL2180 can output 100mA, while the EL2280 and the
EL2480 can output 55mA per amplifier. The EL2180,
EL2280, and EL2480 work with supply voltages ranging from
a single 3V to ±6V, and they are also capable of swinging to
within 1V of either supply on the input and the output.
Because of their current-feedback topology, the EL2180,
EL2280, and EL2480 do not have the normal gainbandwidth product associated with voltage-feedback
operational amplifiers. This allows their -3dB bandwidth to
remain relatively constant as closed-loop gain is increased.
This combination of high bandwidth and low power, together
with aggressive pricing make the EL2180, EL2280, and
EL2480 the ideal choice for many low-power/high-bandwidth
applications such as portable computing, HDSL, and video
processing.
For applications where board space is extremely critical, the
EL2180 is available in the tiny 5-pin SOT-23 package, which
has a footprint 28% the size of an 8-pin SO. The EL2180,
EL2280, and EL2480 are each also available in industry
standard pinouts in PDIP and SO packages.
For single, dual and triple applications with disable, consider
the EL2186 (8-pin single), EL2286 (14-pin dual) and EL2386
(16-pin triple). If lower power is required, refer to the
EL2170/EL2176 family which provides singles, duals, and
quads with 70MHz of bandwidth while consuming 1mA of
supply current per amplifier.
Power Supply Bypassing and Printed Circuit
Board Layout
As with any high-frequency device, good printed circuit
board layout is necessary for optimum performance. Ground
plane construction is highly recommended. Lead lengths
should be as short as possible. The power supply pins must
be well bypassed to reduce the risk of oscillation. The
combination of a 4.7µF tantalum capacitor in parallel with a
0.1µF capacitor has been shown to work well when placed at
each supply pin.
For good AC performance, parasitic capacitance should be
kept to a minimum especially at the inverting input (see the
Capacitance at the Inverting Input section). Ground plane
construction should be used, but it should be removed from
the area near the inverting input to minimize any stray
capacitance at that node. Carbon or Metal-Film resistors are
acceptable with the Metal-Film resistors giving slightly less
peaking and bandwidth because of their additional series
inductance. Use of sockets, particularly for the SO package,
should be avoided if possible. Sockets add parasitic
11
inductance and capacitance which will result in some
additional peaking and overshoot.
Capacitance at the Inverting Input
Any manufacturer's high-speed voltage- or current-feedback
amplifier can be affected by stray capacitance at the
inverting input. For inverting gains this parasitic capacitance
has little effect because the inverting input is a virtual
ground, but for non-inverting gains this capacitance (in
conjunction with the feedback and gain resistors) creates a
pole in the feedback path of the amplifier. This pole, if low
enough in frequency, has the same destabilizing effect as a
zero in the forward open-loop response. The use of large
value feedback and gain resistors further exacerbates the
problem by further lowering the pole frequency.
The experienced user with a large amount of PC board
layout experience may find in rare cases that the EL2180,
EL2280, and EL2480 have less bandwidth than expected.
The reduction of feedback resistor values (or the addition of
a very small amount of external capacitance at the inverting
input, e.g. 0.5pF) will increase bandwidth as desired. Please
see the curves for Frequency Response for Various RF and
RG, and Frequency Response for Various CIN-.
Feedback Resistor Values
The EL2180, EL2280, and EL2480 have been designed and
specified at gains of +1 and +2 with RF = 750Ω in PDIP and
SO packages and RF = 560Ω in SOT23-5 package. These
values of feedback resistors give 250MHz of -3dB bandwidth
at AV = +1 with about 2.5dB of peaking, and 180MHz of -3dB
bandwidth at AV = +2 with about 0.1dB of peaking. The
SOT23-5 package is characterized with a smaller value of
feedback resistor, for a given bandwidth, to compensate for
lower parasitics within both the package itself and the printed
circuit board where it will be placed. Since the EL2180,
EL2280, and EL2480 are current-feedback amplifiers, it is
also possible to change the value of RF to get more
bandwidth. As seen in the curve of Frequency Response For
Various RF and RG, bandwidth and peaking can be easily
modified by varying the value of the feedback resistor.
Because the EL2180, EL2280, and EL2480 are currentfeedback amplifiers, their gain-bandwidth product is not a
constant for different closed-loop gains. This feature actually
allows the EL2180, EL2280, and EL2480 to maintain about
the same -3dB bandwidth, regardless of closed-loop gain.
However, as closed-loop gain is increased, bandwidth
decreases slightly while stability increases. Since the loop
stability is improving with higher closed-loop gains, it
becomes possible to reduce the value of RF below the
specified 560Ω and 750Ω and still retain stability, resulting in
only a slight loss of bandwidth with increased closed-loop
gain.
EL2180, EL2280, EL2480
Supply Voltage Range and Single-Supply
Operation
minimum output drive of each EL2280 and EL2480 amplifier
allows swings of ±2.5V into 50Ω loads.
The EL2180, EL2280, and EL2480 have been designed to
operate with supply voltages having a span of greater than
3V, and less than 12V. In practical terms, this means that the
EL2180, EL2280, and EL2480 will operate on dual supplies
ranging from ±1.5V to ±6V. With a single-supply, the EL2180,
EL2280, and EL2480 will operate from +3V to +12V.
Driving Cables and Capacitive Loads
As supply voltages continue to decrease, it becomes
necessary to provide input and output voltage ranges that
can get as close as possible to the supply voltages. The
EL2180, EL2280, and EL2480 have an input voltage range
that extends to within 1V of either supply. So, for example, on
a single +5V supply, the EL2180, EL2280, and EL2480 have
an input range which spans from 1V to 4V. The output range
of the EL2180, EL2280, and EL2480 is also quite large,
extending to within 1V of the supply rail. On a ±5V supply,
the output is therefore capable of swinging from -4V to +4V.
Single-supply output range is even larger because of the
increased negative swing due to the external pull-down
resistor to ground. On a single +5V supply, output voltage
range is about 0.3V to 4V.
Video Performance
For good video performance, an amplifier is required to
maintain the same output impedance and the same
frequency response as DC levels are changed at the output.
This is especially difficult when driving a standard video load
of 150Ω, because of the change in output current with DC
level. Until the EL2180, EL2280, and EL2480, good
Differential Gain could only be achieved by running high idle
currents through the output transistors (to reduce variations
in output impedance). These currents were typically
comparable to the entire 3mA supply current of each
EL2180, EL2280, and EL2480 amplifier! Special circuitry
has been incorporated in the EL2180, EL2280, and EL2480
to reduce the variation of output impedance with current
output. This results in dG and dP specifications of 0.05%
and 0.05° while driving 150Ω at a gain of +2.
Video performance has also been measured with a 500Ω
load at a gain of +1. Under these conditions, the EL2180,
EL2280, and EL2480 have dG and dP specifications of
0.01% and 0.01° respectively while driving 500Ω at AV = +1.
Output Drive Capability
In spite of its low 3mA of supply current, the EL2180 is
capable of providing a minimum of ±80mA of output current.
Similarly, each amplifier of the EL2280 and the EL2480 is
capable of providing a minimum of ±50mA. These output drive
levels are unprecedented in amplifiers running at these supply
currents. With a minimum ±80mA of output drive, the EL2180
is capable of driving 50Ω loads to ±4V, making it an excellent
choice for driving isolation transformers in
telecommunications applications. Similarly, the ±50mA
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, the back-termination series resistor will decouple
the EL2180, EL2280, and EL2480 from the cable and allow
extensive capacitive drive. However, other applications may
have high capacitive loads without a back-termination resistor.
In these applications, a small series resistor (usually between
5Ω and 50Ω) can be placed in series with the output to
eliminate most peaking. The gain resistor (RG) can then be
chosen to make up for any gain loss which may be created by
this additional resistor at the output. In many cases it is also
possible to simply increase the value of the feedback resistor
(RF) to reduce the peaking.
Current Limiting
The EL2180, EL2280, and EL2480 have no internal currentlimiting circuitry. If any output is shorted, it is possible to
exceed the Absolute Maximum Ratings for output current or
power dissipation, potentially resulting in the destruction of the
device.
Power Dissipation
With the high output drive capability of the EL2180, EL2280,
and EL2480, it is possible to exceed the 150°C Absolute
Maximum junction temperature under certain very high load
current conditions. Generally speaking, when RL falls below
about 25Ω, it is important to calculate the maximum junction
temperature (TJMAX) for the application to determine if powersupply voltages, load conditions, or package type need to be
modified for the EL2180, EL2280, and EL2480 to remain in
the safe operating area. These parameters are calculated as
follows [1]:
T JMAX = T MAX + ( Θ JA × n × PD MAX )
where:
TMAX = Maximum ambient temperature
θJA = Thermal resistance of the package
n = Number of amplifiers in the package
PDMAX = Maximum power dissipation of each amplifier in
the package
PDMAX for each amplifier can be calculated as follows [2]:
V OUTMAX
PD MAX = ( 2 × V S × I SMAX ) + ( V S - V OUTMAX ) × ---------------------------RL
where:
VS = Supply voltage
ISMAX = Maximum supply current of 1 amplifier
VOUTMAX = Maximum output voltage of the application
RL = Load resistance
12
EL2180, EL2280, EL2480
Typical Application Circuits
FAST-SETTLING PRECISION AMPLIFIER
INVERTING 200mA OUTPUT CURRENT DISTRIBUTION
AMPLIFIER
120
120
DIFFERENTIAL LINE-DRIVER/RECEIVER
13
EL2180, EL2280, EL2480
EL2180/EL2280/EL2480 Macromodel
* EL2180 Macromodel
* Revision A, March 1995
* AC characteristics used: Rf = Rg = 750 ohms
* Connections:
+input
*
|
-input
*
|
|
+Vsupply
*
|
|
|
-Vsupply
*
|
|
|
|
output
*
|
|
|
|
|
.subckt EL2180/el 3 2 7 4 6
*
* Input Stage
*
e1 10 0 3 0 1.0
vis 10 9 0V
h2 9 12 vxx 1.0
r1 2 11 400
l1 11 12 25nH
iinp 3 0 1.5uA
iinm 2 0 3uA
r12 3 0 2Meg
*
* Slew Rate Limiting
*
h1 13 0 vis 600
r2 13 14 1K
d1 14 0 dclamp
d2 0 14 dclamp
*
* High Frequency Pole
*
e2 30 0 14 0 0.00166666666
l3 30 17 150nH
c5 17 0 0.8pF
r5 17 0 165
*
* Transimpedance Stage
*
g1 0 18 17 0 1.0
rol 18 0 450K
cdp 18 0 0.675pF
*
* Output Stage
*
q1 4 18 19 qp
q2 7 18 20 qn
q3 7 19 21 qn
q4 4 20 22 qp
r7 21 6 4
r8 22 6 4
ios1 7 19 1mA
ios2 20 4 1mA
*
* Supply Current
*
ips 7 4 0.2mA
*
* Error Terms
*
14
EL2180, EL2280, EL2480
ivos 0 23 0.2mA
vxx 23 0 0V
e4 24 0 3 0 1.0
e5 25 0 7 0 1.0
e6 26 0 4 0 -1.0
r9 24 23 316
r10 25 23 3.2K
r11 26 23 3.2K
*
* Models
*
.model qn npn(is=5e-15 bf=200 tf=0.01nS)
*.model qp pnp(is=5e-15 bf=200 tf=0.01nS)
.model dclamp d(is=1e-30 ibv=0.266
+ bv=0.71v n=4)
.ends
EL2180/EL2280/EL2480 Macromodel
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
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15
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