Intersil EL2130 85mhz current feedback amplifier Datasheet

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December 1995, Rev. C
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FN7047
85MHz Current Feedback Amplifier
Features
The EL2130 is a wideband current
mode feedback amplifier optimized for
gains between -10 and +10 while
operating on ±5V power supplies. Built using Elantec's
Complementary Bipolar process, this device exhibits -3dB
bandwidths in excess of 85MHz at unity gain and 75MHz at
a gain of two. The EL2130 is capable of output currents in
excess of 50mA giving it the ability to drive either double or
single terminated 50Ω coaxial cables.
• -3dB bandwidth = 85MHz, AV = 1
Exhibiting a Differential Gain of 0.03% and a Differential
Phase of 0.1° at NTSC and PAL frequencies, the EL2130 is
an excellent low cost solution to most video applications.
In addition, the EL2130 exhibits very low gain peaking,
typically below 0.1dB to frequencies in excess of 40MHz as
well as 50ns settling time to 0.2% making it an excellent
choice for driving flash A/D converters.
The device is available in the plastic 8-pin narrow-body small
outline (SO) and the 8-pin mini DIP packages, and operates
over the temperature range of 0°C to +75°C
• -3dB bandwidth = 75MHz, AV = 2
• NTSC/PAL dG ≤ 0.03%, dP ≤ 0.1°
• 50mA output current
• Drives ±2.5V into 100Ω load
• Low voltage noise = 4nV√Hz
• Current mode feedback
• Low cost
Applications
• Video amplifier
• Video distribution amplifier
• Residue amplifiers in ADC
• Current to voltage converter
• Coaxial cable driver
Pinout
EL2130
(8-PIN PDIP, SO)
TOP VIEW
Ordering Information
PART
NUMBER
TEMP. RANGE
PACKAGE
PKG. NO.
EL2130CN
0°C to +75°C
8-Pin PDIP
MDP0031
EL2130CS
0°C to +75°C
8-Pin SO
MDP0027
Manufactured under U.S. Patent No. 4,893,091.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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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.
EL2130
Absolute Maximum Ratings (TA = 25°C)
VS
VIN
∆VIN
PD
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±6V
Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±VS
Differential Input Voltage. . . . . . . . . . . . . . . . . . . . . . . .±6V
Maximum Power Dissipation. . . . . . . . . . . . . . See Curves
IIN
IOP
TA
TJ
TST
Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±10mA
Output Short Circuit Duration . . . . . . . . . . . . . . . . .≤ 5 sec
Operating Temperature Range: . . . . . . . . . . . 0°C to +75°C
Operating Junction Temperature . . . . . . . . . . . . . . . 150°C
Storage Temperature. . . . . . . . . . . . . . . . -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
Open-Loop DC Electrical Specifications
PARAMETER
VOS
DESCRIPTION
VS = ±5V; RL = ∞, unless otherwise specified.
CONDITION
Input Offset Voltage
TEMP
MIN
25°C
TYP
MAX
UNITS
2.0
10
mV
15
mV
TMIN, TMAX
VOS/T
Offset Voltage Drift
+IIN
+Input Current
25°C
5.5
TMIN, TMAX
-IIN
+Input Current
25°C
10
TMIN, TMAX
+RIN
+Input Resistance
25°C
CIN
+Input Capacitance
25°C
CMRR
Common Mode
Rejection Ratio
VCM = ±2.5V
25°C
-ICMR
Input Current Common
Mode Rejection
VCM = ±2.5V
25°C
1.0
50
PSRR
Power Supply Rejection
Ratio
±4.5V ≤ VS ≤ ± 6V
25°C
+IPSR
+Input Current Power
Supply Rejection
±4.5V ≤ VS ≤ ±6V
25°C
±4.5V ≤ VS ≤ ±6V
AVOL
Transimpedance
Open Loop DC
Voltage Gain
VOUT = ±2.5V,
RL = 100Ω
VOUT = ±2.5V,
RL = 100Ω
RL = 100Ω
µA
50
µA
dB
10
µA/V
20
µA/V
70
0.5
dB
0.5
µA/V
1.0
µA/V
5.0
µA/V
8.0
µA/V
25°C
80
145
TMIN, TMAX
70
V/mA
25°C
60
TMIN, TMAX
56
25°C
3
3.5
V
30
50
mA
Ω
V/mA
66
dB
dB
VO
Output Voltage Swing
IOUT
Output Current
25°C
ROUT
Output Resistance
25°C
5
IS
Quiescent Supply Current
Full
17
ISC
Short Circuit Current
25°C
85
2
40
60
TMIN, TMIN
ROL
µA
pF
0.1
25°C
25
1.0
TMIN, TMIN
-Input Current Power
Supply Rejection
µA
MΩ
5
60
15
2.0
TMIN, TMIN
-IPSR
µV/°C
7
21
mA
mA
EL2130
Closed-Loop AC Electrical Specifications
PARAMETER
DESCRIPTION
VS = ±5V, AV = +2, RF = RG = 820Ω, RL = 100Ω, TA = 25°C
CONDITION
MIN
TYP
MAX
UNITS
SR
Slew Rate (Note 1)
VO = 5VP-P
625
V/µs
tR
Rise Time
VO = 200mV
4.6
ns
tF
Fall Time
VO = 200mV
4.6
ns
tPD
Prop Delay
VO = 200mV
4.0
ns
SSBW
3dB Bandwidth
VO = 100mV
75
MHz
dG
NTSC/PAL Diff Gain
0.03
%
dP
NTSC/PAL Diff Phase
0.10
deg (°)
GFPL
Gain Flatness
0.08
dB
f < 40MHz
NOTE:
1. Slew rate is measured with VO = 5VP-P between -1.25V and +1.25V and +1.25V and -1.25V.
3
EL2130
Typical Performance Curves
Normalized Offset Voltage
vs Temperature
Equivalent Input Noise
Common Mode Rejection
Ratio vs Frequency
Common Mode Rejection
Ratio vs Temperature
Power Supply Rejection
Ratio vs Frequency
Power Supply Rejection
Ratio vs Temperature
-Input Bias Current
vs Temperature
-Input Bias Current
Power Supply
Rejection Ratio
-Input Bias Current
Common Mode Rejection
Ratio vs Temperature
4
EL2130
Typical Performance Curves
Supply Current
vs Temperature
Transimpedance (ROL)
vs Temperature
Frequency Response
5
(Continued)
+Input Bias Current
vs Temperature
Transimpedance (ROL)
vs Frequency
Output Voltage
vs Temperature
+Input Bias Current
Power Supply Rejection
Ratio vs Temperature
Open Loop Gain
vs Temperature
Short Circuit Current
vs Temperature
EL2130
Typical Performance Curves
(Continued)
Large Signal Response
Large Signal Response
AV = +1, RF = 820Ω
RL = 100Ω, CL = 12pF
AV = +2, RF = 820Ω
RL = 100Ω, CL = 12pF
Small Signal Response
Small Signal Response
Long-Term Output
Settling Error vs Time,
VS = ±5V
Short Term
Output Settling Error vs
Time, VS = ±5V
AV = +2, RF = 820Ω
RL = 100Ω, CL = 12pF
AV = +1, RF = 820Ω
RL = 100Ω, CL = 12pF
Bandwidth and Peaking
vs RF for AV = +1
Rise Time and Overshoot
vs RF for AV = 1
6
Bandwidth and Peaking
vs RF for AV = +2
Rise Time and Overshoot
vs RF for AV = 2
8-Pin Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
8-Pin SO
Maximum Power Dissipation
vs Ambient Temperature
EL2130
Applications Information
Equivalent Circuit
Power Supply Bypassing
The EL2130 will exhibit ringing or oscillation if the power
supply leads are not adequately bypassed. 0.1µF ceramic
disc capacitors are suggested for both supply pins at a
distance no greater than 1/2 inch from the device. Surface
mounting chip capacitors are strongly recommended.
Lead Dress
A ground plane to which decoupling capacitors and gain
setting resistors are terminated will eliminate overshoot and
ringing. However, the ground plane should not extend to the
vicinity of both the non-inverting and inverting inputs (pins 3
and 2) which would add capacitance to these nodes, and
lead lengths from these pins should be made as short as
possible.
Use of sockets, particularly for the SO package, should be
avoided if possible. Sockets add parasitic inductance and
capacitance which will result in peaking and overshoot.
Video Characteristics and Applications
Frequency domain testing is performed at Elantec using a
computer controlled HP model 8656B Signal Generator and
an HP Model 4195A Network/Spectrum Analyzer. The DUT
test board is built using microwave/strip line techniques, and
solid coaxial cables route the stimulus to the DUT socket.
Signals are routed to and from the DUT test fixture using
subminiature coaxial cable.
AC Test Circuit
Differential Gain and Phase are tested at a noise gain of 2
with 100Ω load. Gain and Phase measurements are made
with a DC input reference voltage at 0V and compared to
those made at VREF equal to 0.7V at frequencies extending
to 30MHz.
The EL2130 is capable of driving 100Ω to a minimum of 2.5V
peak which means that it can naturally drive double
terminated (50Ω) coaxial cables.
Capacitive Loads
As can be seen from the Bode plot, the EL2130 will peak into
capacitive loads greater than 20pF. In many applications
such as flash A/Ds, capacitive loading is unavoidable. In
these cases, the use of a snubber network consisting of a
100Ω resistor in series with 47pF capacitor from the output
to ground is recommended.
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
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