DATASHEET

EL5462
®
Data Sheet
February 14, 2005
500MHz Low Power Current Feedback
Amplifier
FN7492.0
Features
• 500MHz -3dB bandwidth
The EL5462 is a current feedback amplifier with a bandwidth
of 500MHz which makes this amplifier ideal for today’s high
speed video and monitor applications.
• 4000V/µs slew rate
• 1.5mA supply current per amplifier
With a supply current of just 1.5mA per amplifier and the
ability to run from a single supply voltage from 5V to 12V, the
EL5462 is also ideal for handheld, portable or batterypowered equipment.
• Single and dual supply operation, from 5V to 12V supply
span
The EL5462 is available in a 14-pin SO package and
operates over the industrial temperature range of -40°C to
+85°C.
• High speed, 4mA, 630MHz product available (EL5164 &
EL5165)
Pinout
Applications
EL5462
(14-PIN SO)
TOP VIEW
OUTA 1
INA- 2
D
+ -
13 IND-
11 VS-
VS+ 4
10 INC+
INB+ 5
INB- 6
• Handheld, portable devices
12 IND+
INA+ 3
- +
B
+ C
OUTB 7
• Pb-free available (RoHS compliant)
• Battery-powered equipment
14 OUTD
A
- +
• High speed, 1.4GHz product available (EL5167 &
EL5167)
• Video amplifiers
• Cable drivers
• RGB amplifiers
• Test equipment
• Instrumentation
• Current-to-voltage converters
9 INC8 OUTC
Ordering Information
PART NUMBER
PACKAGE
TAPE &
REEL
PKG. DWG. #
EL5462IS
14-Pin SO
-
MDP0027
EL5462IS-T7
14-Pin SO
7”
MDP0027
EL5462IS-T13
14-Pin SO
13”
MDP0027
EL5462ISZ
(See Note)
14-Pin SO
(Pb-Free)
-
MDP0027
EL5462ISZ-T7
(See Note)
14-Pin SO
(Pb-Free)
7”
MDP0027
EL5462ISZ-T13
(See Note)
14-Pin SO
(Pb-Free)
13”
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.
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. 2005. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
EL5462
Absolute Maximum Ratings (TA = 25°C)
Supply Voltage between VS+ and VS- . . . . . . . . . . . . . . . . . . .
Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . .
Maximum Voltage between IN+ and IN-, Disabled . . . . . . . . .
Current into IN+, IN-, CE . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Slew Rate from VS+ to VS- . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.2V
50mA
±1.5V
±5mA
1V/µs
Pin Voltages. . . . . . . . . . . . . . . . . . . . . . . . .VS- - 0.5V to VS+ +0.5V
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +125°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Ambient Operating Temperature . . . . . . . . . . . . . . . .-40°C to +85°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
Electrical Specifications
PARAMETER
VS+ = +5V, VS- = -5V, RF = 750Ω for AV = 1, RF = 400Ω for AV = 2, RL = 150Ω, TA = 25°C unless otherwise
specified.
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
AC PERFORMANCE
BW
-3dB Bandwidth
AV = +1, RL = 500Ω, RF = 598Ω
500
MHz
AV = +2, RL = 150Ω, RF = 422Ω
233
MHz
30
MHz
BW1
0.1dB Bandwidth
SR
Slew Rate
VO = -2.5V to +2.5V, AV = +2, RL = 100Ω
tS
0.1% Settling Time
VOUT = -2.5V to +2.5V, AV = +1
eN
2500
4000
5000
V/µs
25
ns
Input Voltage Noise
3
nV/√Hz
iN-
IN- Input Current Noise
10
pA/√Hz
iN+
IN+ Input Current Noise
6.5
pA/√Hz
dG
Differential Gain Error (Note 1)
AV = +2
0.05
%
dP
Differential Phase Error (Note 1)
AV = +2
0.15
°
DC PERFORMANCE
VOS
Offset Voltage
TCVOS
Input Offset Voltage Temperature
Coefficient
ROL
Transimpedance
-5
Measured from TMIN to TMAX
1.5
+5
mV
6
µV/°C
500
1000
kΩ
V
INPUT CHARACTERISTICS
CMIR
Common Mode Input Range
Guaranteed by CMRR test
±3
±3.3
CMRR
Common Mode Rejection Ratio
VIN = ±3V
50
62
75
dB
-ICMR
- Input Current Common Mode Rejection
-1
0.22
+1
µA/V
+IIN
+ Input Current
-8
0.5
+8
µA
-IIN
- Input Current
-10
2
+10
µA
RIN
Input Resistance
0.8
1.6
3
MΩ
CIN
Input Capacitance
1
pF
OUTPUT CHARACTERISTICS
VO
IOUT
Output Voltage Swing
Output Current
2
RL = 150Ω to GND
±3.35
±3.6
±3.75
V
RL = 1kΩ to GND
±3.75
±3.9
±4.15
V
RL = 10Ω to GND
60
100
mA
FN7492.0
February 14, 2005
EL5462
Electrical Specifications
PARAMETER
VS+ = +5V, VS- = -5V, RF = 750Ω for AV = 1, RF = 400Ω for AV = 2, RL = 150Ω, TA = 25°C unless otherwise
specified. (Continued)
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
1.7
mA
SUPPLY
ISON
Supply Current - Enabled, per Amplifier
No load, VIN = 0V
1.3
1.5
PSRR
Power Supply Rejection Ratio
DC, VS = ±4.75V to ±5.25V
65
76
-IPSR
- Input Current Power Supply Rejection
DC, VS = ±4.75V to ±5.25V
-0.5
0.1
dB
+0.5
µA/V
NOTE:
1. Standard NTSC test, AC signal amplitude = 286mVP-P, f = 3.58MHz
Typical Performance Curves
4
AV=+1
VCC=+5V
2 VEE=-5V
RL=500Ω
RF=598Ω
NORMALIZED GAIN (dB)
NORMALIZED GAIN (dB)
4
0
-2
-4
-6
10K
100K
1M
10M
100M
AV=+4.6
VCC=+5V
2 VEE=-5V
RF=375Ω
0
-2
-4
-6
100K
1G
1M
FREQUENCY (Hz)
0
1
NORMALIZED GAIN (dB)
NORMALIZED GAIN (dB)
3
-2
-4
100M
1G
FREQUENCY (Hz)
FIGURE 3. FREQUENCY RESPONSE FOR AV=+10
3
1G
FIGURE 2. FREQUENCY RESPONSE FOR AV=+4.6
2
10M
100M
FREQUENCY (Hz)
FIGURE 1. FREQUENCY RESPONSE FOR AV=+1
AV=+10
VCC=+5V
-6 VEE=-5V
RL=150Ω
RF=375Ω
-8
100K
1M
10M
-1
-3
AV=+2
VCC=+5V
-5 VEE=-5V
RL=150Ω
RF=422Ω
-7
100K
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 4. FREQUENCY RESPONSE FOR AV=+2
FN7492.0
February 14, 2005
EL5462
Typical Performance Curves
(Continued)
5
1
NORMALIZED GAIN (dB)
NORMALIZED GAIN (dB)
3
-1
-3
AV=+4
VCC=+5V
-5 VEE=-5V
RL=150Ω
RF=422Ω
-7
100K
1M
10M
100M
1G
AV=+1
RL=150Ω
3 RF=698Ω
VCC,VEE=±6V
1
VCC,VEE=±4V
-3
-5
100K
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
10
VCC,VEE=±3V
VCC,VEE=±2.5V
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 5. FREQUENCY RESPONSE FOR AV=+4
100
VCC,VEE=±5V
-1
FIGURE 6. FREQUENCY RESPONSE FOR VARIOUS VCC, VEE
AV=+2
VCC=+5V
VEE=-5V
INPUT
RISE
TIME
1.028ns
1V/DIV
1
OUTPUT
RISE
TIME
2.218ns
0.1
0.01
10K
100K
1M
10M
100M
2V/DIV
AV=+2
VCC=+5V
VEE=-5V
RL=150Ω
4ns/DIV
FREQUENCY (Hz)
FIGURE 7. CLOSED LOOP OUTPUT IMPEDANCE
INPUT
FALL
TIME
1.036ns
AV=+2
VCC=+5V
VEE=-5V
RL=150Ω
1V/DIV
OUTPUT
FALL
TIME
2.21ns
CH1=5V
CH2=200mV
M=100ns
CH1
2V/DIV
4ns/DIV
FIGURE 9. OUTPUT FALL TIME
4
FIGURE 8. OUTPUT RISE TIME
CH2
100ns/DIV
FIGURE 10. TURN ON TIME
FN7492.0
February 14, 2005
EL5462
Typical Performance Curves
(Continued)
0
AV=+2
VCC=+5V
-20 VEE=-5V
RL=150Ω
CH1=5V
CH2=200mV
M=100ns
PSRR (dB)
CH1
CH2
-40
-60
-80
-100
10
100ns/DIV
1K
100
10K
100K
10M
1M
100M
FREQUENCY (Hz)
FIGURE 11. TURN OFF TIME
FIGURE 12. PSRR (VCC)
0
1.4
POWER DISSIPATION (W)
PSRR (dB)
AV=+2
VCC=+5V
-20 VEE=-5V
RL=150Ω
-40
-60
-80
-100
10
1K
100
10K
100K
10M
1M
100M
1.2 1.136W
1
θ
JA
=
0.8
SO
88
0.6
°C
14
/W
0.4
0.2
0
0
25
50
75 85 100
125
150
AMBIENT TEMPERATURE (°C)
FREQUENCY (Hz)
FIGURE 13. PSRR (VEE)
1
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
FIGURE 14. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
JEDEC JESD51-3 LOW EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
POWER DISSIPATION (W)
0.9 833mW
0.8
0.7
θ
0.6
SO
JA
=1 14
2
0.5
/W
0°
C
0.4
0.3
0.2
0.1
0
0
25
50
75 85 100
125
150
AMBIENT TEMPERATURE (°C)
FIGURE 15. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
5
FN7492.0
February 14, 2005
EL5462
Pin Descriptions
EL5462
PIN NAME
2, 6, 9, 13
IN-
FUNCTION
EQUIVALENT CIRCUIT
Inverting input
VS+
IN+
IN-
VSCircuit 1
3, 5, 10, 12
IN+
Non-inverting input
11
VS-
Negative supply
1, 7, 8, 14
OUT
Output
(See circuit 1)
VS+
OUT
VSCircuit 2
4
VS+
Positive supply
Applications Information
Product Description
The EL5462 is a low power, current-feedback operational
amplifier that offers a wide -3dB bandwidth of 500MHz and a
low supply current of 1.5mA per amplifier. The EL5462
works with supply voltages ranging from a single 5V to 10V
and they are also capable of swinging to within 1V of either
supply on the output. Because of its current-feedback
topology, the EL5462 does not have the normal gainbandwidth product associated with voltage-feedback
operational amplifiers. Instead, its -3dB bandwidth to remain
relatively constant as closed-loop gain is increased. This
combination of high bandwidth and low power, together with
aggressive pricing makes the EL5462 the ideal choice for
many low-power/high-bandwidth applications such as
portable, handheld, or battery-powered equipment.
Power Supply Bypassing and Printed Circuit
Board Layout
As with any high frequency device, a good printed circuit
board layout is necessary for optimum performance. Low
impedance ground plane construction is essential. Surface
mount components are recommended, but if leaded
components are used, 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 0.01µF capacitor has
been shown to work well when placed at each supply pin.
ground plane construction is used, 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 additional series
inductance. Use of sockets, particularly for the SO package,
should be avoided if possible. Sockets add parasitic
inductance and capacitance which will result in 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 largevalue feedback and gain resistors exacerbates the problem
by further lowering the pole frequency (increasing the
possibility of oscillation.)
The EL5462 has been optimized with a 600Ω feedback
resistor. With the high bandwidth of these amplifiers, these
resistor values might cause stability problems when
combined with parasitic capacitance, thus ground plane is
not recommended around the inverting input pin of the
amplifier.
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) Even when
6
FN7492.0
February 14, 2005
EL5462
Feedback Resistor Values
The EL5462 has been designed and specified at a gain of +1
with RF approximately 606Ω. This value of feedback resistor
gives 500MHz of -3dB bandwidth at AV = 1 with 0.5dB of
peaking. With AV = -2, an RF of approximately 600Ω gives
300MHz of bandwidth with 1dB of peaking. Since the
EL5462 is a current-feedback amplifier, 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 EL5462 is a current-feedback amplifier, its
gain-bandwidth product is not a constant for different closedloop gains. This feature actually allows the EL5462 to
maintain about the same -3dB bandwidth. As 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 TBDΩ and still retain stability,
resulting in only a slight loss of bandwidth with increased
closed-loop gain.
Supply Voltage Range and Single-Supply
Operation
The EL5462 has been designed to operate with supply
voltages having a span of greater than 5V and less than 10V.
In practical terms, this means that they will operate on dual
supplies ranging from ±2.5V to ±5V. With single-supply, the
EL5462 will operate from 5V to 10V.
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
EL5462 has an input range which extends to within 2V of
either supply. So, for example, on +5V supplies, the EL5462
has an input range which spans ±3V. The output range of the
EL5462 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
larger because of the increased negative swing due to the
external pull-down resistor to ground.
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. Previously, 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 1mA
supply current of the EL5462 amplifier. Special circuitry has
been incorporated in the EL5462 to reduce the variation of
output impedance with current output. This results in dG and
7
dP specifications of 0.1% and 0.1°, 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 EL5462 has
dG and dP specifications of 0.1% and 0.1°.
Output Drive Capability
In spite of its low 1.5mA of supply current, the EL5462 is
capable of providing a minimum of ±50mA of output current.
With a minimum of ±50mA of output drive, the EL5462 is
capable of driving 50Ω loads to both rails, making it an
excellent choice for driving isolation transformers in
telecommunications applications.
Driving Cables and Capacitive Loads
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 EL5462 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 EL5462 has no internal current-limiting circuitry. If the
output is shorted, it is possible to exceed the Absolute
Maximum Rating for output current or power dissipation,
potentially resulting in the destruction of the device.
Power Dissipation
With the high output drive capability of the EL5462, it is
possible to exceed the 125°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 power supply
voltages, load conditions, or package type need to be
modified for the EL5462 to remain in the safe operating area.
These parameters are calculated as follows:
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
FN7492.0
February 14, 2005
EL5462
PDMAX for each amplifier can be calculated as follows:
V OUTMAX
PD MAX = ( 2 × V S × I SMAX ) + ( V S – V OUTMAX ) × ---------------------------R
L
where:
• VS = Supply voltage
• ISMAX = Maximum supply current of 1.5mA
• VOUTMAX = Maximum output voltage (required)
• RL = Load resistance
Typical Application Circuits
0.1µF
+5V
IN+
VS+
IN-
OUT
VS-
0.1µF
-5V
500Ω
5Ω
0.1µF
+5V
IN+
VS+
IN-
OUT
VS-
500Ω
5Ω
0.1µF
-5V
VIN
VOUT
500Ω
FIGURE 16. INVERTING 200mA OUTPUT CURRENT
DISTRIBUTION AMPLIFIER
500Ω
500Ω
0.1µF
+5V
IN+
IN500Ω
-5V
500Ω
+5V
VIN
IN+
IN-
VS+
VS-
OUT
0.1µF
0.1µF
VS+
VS-
-5V
OUT
VOUT
0.1µF
FIGURE 17. FAST-SETTLING PRECISION AMPLIFIER
8
FN7492.0
February 14, 2005
EL5462
SO Package Outline Drawing
NOTE: The package drawing shown here may not be the latest version. To check the latest revision, please refer to the Intersil website at
<http://www.intersil.com/design/packages/index.asp>
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
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
9
FN7492.0
February 14, 2005
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