Datenblatt-pdf.com


EL2260CS Schematic ( PDF Datasheet ) - Elantec Semiconductor

Teilenummer EL2260CS
Beschreibung Dual/Quad 130 MHz Current Feedback Amplifiers
Hersteller Elantec Semiconductor
Logo Elantec Semiconductor Logo 




Gesamt 20 Seiten
EL2260CS Datasheet, Funktion
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
Features
 130 MHz 3 dB bandwidth
(AV e a2)
 180 MHz 3 dB bandwidth
(AV e a1)
 0 01% differential gain
RL e 500X
 0 01 differential phase
RL e 500X
 Low supply current 7 5 mA per
amplifier
 Wide supply range g2V to g15V
 80 mA output current (peak)
 Low cost
 1500 V ms slew rate
 Input common mode range to
within 1 5V of supplies
 35 ns settling time to 0 1%
Applications
 Video amplifiers
 Cable drivers
 RGB amplifiers
 Test equipment amplifiers
 Current to voltage converter
Ordering Information
Part No Temp Range Package Outline
EL2260CN b40 C to a85 C 8-Pin P-DIP MDP0031
EL2260CS b40 C to a85 C 8-Pin SOIC MDP0027
EL2460CN b40 C to a85 C 14-Pin P-DIP MDP0031
EL2460CS b40 C to a85 C 14-Pin SOIC MDP0027
General Description
The EL2260C EL2460C are dual quad current feedback opera-
tional amplifiers with b3 dB bandwidth of 130 MHz at a gain
of a2 Built using the Elantec proprietary monolithic comple-
mentary bipolar process these amplifers use current mode feed-
back to achieve more bandwidth at a given gain than a conven-
tional voltage feedback operational amplifier
The EL2260C EL2460C are designed to drive a double termi-
nated 75X coax cable to video levels Differential gain and
phase are excellent when driving both loads of 500X (k0 01%
k0 01 ) and double terminated 75X cables (0 025% 0 1 )
The amplifiers can operate on any supply voltage from 4V
(g2V) to 33V (g16 5V) yet consume only 7 5 mA per amplifier
at any supply voltage Using industry standard pinouts the
EL2260C is available in 8-pin P-DIP and 8-pin SO packages
while the EL2460C is available in 14-pin P-DIP and 14-pin SO
packages
Elantec’s facilities comply with MIL-I-45208A and offer appli-
cable quality specifications For information on Elantec’s pro-
cessing see the Elantec document QRA-1 Elantec’s Process-
ing Monolithic Products
Connection Diagrams
EL2260C SO P-DIP
Packages
EL2460C SO P-DIP
Packages
Top View
2260 – 1
Top View
2260 – 2
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
1992 Elantec Inc






EL2260CS Datasheet, Funktion
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
Typical Performance Curves Contd
3 dB Bandwidth vs Supply
Voltage for AV e a1
Peaking vs Supply Voltage
for AV e a1
3 dB Bandwidth vs Temperature
for AV e a1
3 dB Bandwidth vs Supply
Voltage for AV e a2
Peaking vs Supply Voltage
for AV e a2
3 dB Bandwidth vs Temperature
for AV e a2
3 dB Bandwidth vs Supply
Voltage for AV e a10
Peaking vs Supply Voltage
for AV e a10
3 dB Bandwidth vs Temperature
for AV e a10
2260 – 4
6

6 Page









EL2260CS pdf, datenblatt
EL2260C EL2460C
Dual Quad 130 MHz Current Feedback Amplifiers
Applications Information
Product Description
The EL2260C EL2460C are dual and quad cur-
rent mode feedback amplifiers that offer wide
bandwidths and good video specifications at
moderately low supply currents They are built
using Elantec’s proprietary complimentary bipo-
lar process and are offered in industry standard
pin-outs Due to the current feedback architec-
ture the EL2260C EL2460C closed-loop 3 dB
bandwidth is dependent on the value of the feed-
back resistor First the desired bandwidth is se-
lected by choosing the feedback resistor RF and
then the gain is set by picking the gain resistor
RG The curves at the beginning of the Typical
Performance Curves section show the effect of
varying both RF and RG The 3 dB bandwidth is
somewhat dependent on the power supply volt-
age As the supply voltage is decreased internal
junction capacitances increase causing a reduc-
tion in closed loop bandwidth To compensate for
this smaller values of feedback resistor can be
used at lower supply voltages
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 high-
ly recommended Lead lengths should be as short
as possible below
The power supply pins
must be well bypassed to reduce the risk of oscil-
lation A 1 0 mF tantalum capacitor in parallel
with a 0 01 mF ceramic capacitor is adequate for
each supply pin
For good AC performance parasitic capacitances
should be kept to a minimum especially at the
inverting input (see Capacitance at the Inverting
Input section) This implies keeping the ground
plane away from this pin Carbon resistors are
acceptable while use of wire-wound resistors
should not be used because of their parasitic in-
ductance Similarly capacitors should be low in-
ductance for best performance Use of sockets
particularly for the SO packages should be
avoided Sockets add parasitic inductance and ca-
pacitance which will result in peaking and over-
shoot
Capacitance at the Inverting Input
Due to the topology of the current feedback am-
plifier stray capacitance at the inverting input
will affect the AC and transient performance of
the EL2260C EL2460C when operating in the
non-inverting configuration The characteristic
curve of gain vs frequency with variations of
CINb emphasizes this effect The curve illus-
trates how the bandwidth can be extended to be-
yond 200 MHz with some additional peaking
with an additional 2 pF of capacitance at the
VINb pin for the case of AV e a2 Higher val-
ues of capacitance will be required to obtain simi-
lar effects at higher gains
In the inverting gain mode added capacitance at
the inverting input has little effect since this
point is at a virtual ground and stray capacitance
is therefore not ‘‘seen’’ by the amplifier
Feedback Resistor Values
The EL2260C and EL2460C have been designed
and specified with RF e 560X for AV e a2
This value of feedback resistor yields extremely
flat frequency response with little to no peaking
out to 130 MHz As is the case with all current
feedback amplifiers wider bandwidth at the ex-
pense of slight peaking can be obtained by re-
ducing the value of the feedback resistor Inverse-
ly larger values of feedback resistor will cause
rolloff to occur at a lower frequency By reducing
RF to 430X bandwidth can be extended to
170 MHz with under 1 dB of peaking Further
reduction of RF to 360X increases the bandwidth
to 195 MHz with about 2 5 dB of peaking See
the curves in the Typical Performance Curves
section which show 3 dB bandwidth and peaking
vs frequency for various feedback resistors and
various supply voltages
Bandwidth vs Temperature
Whereas many amplifier’s supply current and
consequently 3 dB bandwidth drop off at high
temperature the EL2260C EL2460C were de-
signed to have little supply current variations
with temperature An immediate benefit from
this is that the 3 dB bandwidth does not drop off
drastically with temperature With VS e g15V
and AV e a2 the bandwidth only varies from
150 MHz to 110 MHz over the entire die junction
temperature range of 0 C k T k 150 C
12

12 Page





SeitenGesamt 20 Seiten
PDF Download[ EL2260CS Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
EL2260CDual/Quad 130 MHz Current Feedback AmplifiersElantec Semiconductor
Elantec Semiconductor
EL2260CNDual/Quad 130 MHz Current Feedback AmplifiersElantec Semiconductor
Elantec Semiconductor
EL2260CSDual/Quad 130 MHz Current Feedback AmplifiersElantec Semiconductor
Elantec Semiconductor

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche