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PDF EL2160CS-T13 Data sheet ( Hoja de datos )
| Número de pieza | EL2160CS-T13 | |
| Descripción | 180MHz Current Feedback Amplifier | |
| Fabricantes | Elantec Semiconductor | |
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EL2160C
180MHz Current Feedback Amplifier
Features
• 130MHz 3dB bandwidth (AV=+2)
• 180MHz 3dB bandwidth (AV=+1)
• 0.01% differential gain, RL=500Ω
• 0.01° differential phase, RL=500Ω
• Low supply current, 8.5mA
• Wide supply range, ±2V to ±15V
• 80mA output current (peak)
• Low cost
• 1500V/µs slew rate
• Input common mode range to
within 1.5V of supplies
• 35ns settling time to 0.1%
Applications
• Video amplifiers
• Cable drivers
• RGB amplifiers
• Test equipment amplifiers
• Current to voltage converters
General Description
The EL2160C is a current feedback operational amplifier with -3dB
bandwidth of 130MHz at a gain of +2. Built using the Elantec propri-
etary monolithic complementary bipolar process, this amplifier uses
current mode feedback to achieve more bandwidth at a given gain than
a conventional voltage feedback operational amplifier.
The EL2160C is designed to drive a double terminated 75Ω coax
cable to video levels. Differential gain and phase are excellent when
driving both loads of 500Ω (<0.01%/<0.01°) and double terminated
75Ω cables (0.025%/0.1°).
The amplifier can operate on any supply voltage from 4V (±2V) to
33V (±16.5V), yet consume only 8.5mA at any supply voltage. Using
industry-standard pinouts, the EL2160C is available in 8-pin PDIP and
SO packages, as well as a 16-pin SO (0.300”) package. All are speci-
fied for operation over the full -40°C to +85°C temperature range. For
dual and quad applications, please see the EL2260C/EL2460C
datasheet.
Connection Diagrams
Ordering Information
Part No.
Package
Tape & Reel
EL2160CN
8-Pin PDIP
-
EL2160CS-T7
8-Pin SO
7”
EL2160CS-T13
8-Pin SO
13”
EL2160CM
16-Pin SO (0.300”)
-
EL2160CM-T13 16-Pin SO (0.300”)
13”
Outline#
MDP0031
MDP0027
MDP0027
MDP0027
MDP0027
NC 1
16 NC
NC 2
15 NC
-IN 3
NC 4
+IN 5
-
+
14 VS+
13 NC
12 OUT
NC 6
11 NC
VS- 7
10 NC
NC 8
9 NC
16-Pin SO (0.300”)
NC 1
8 NC
-IN 2
+IN 3
-
+
7 VS+
6 OUT
VS- 4
8-Pin PDIP/SO
5 NC
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.
© 2001 Elantec Semiconductor, Inc.
1 page  
3 dB Bandwidth vs Supply
Voltage for AV = +1
EL2160C
180MHz Current Feedback Amplifier
Peaking vs Supply Voltage
for AV = +1
3 dB Bandwidth vs Temperature
for AV = +1
3 dB Bandwidth vs Supply
Voltage for AV = +2
Peaking vs Supply Voltage
for AV = +2
3 dB Bandwidth vs Temperature
for AV = +2
3 dB Bandwidth vs Supply
Voltage for AV = +10
Peaking vs Supply Voltage
for AV = +10
3 dB Bandwidth vs Temperature
for AV = +10
5
5 Page 
EL2160C
180MHz Current Feedback Amplifier
Applications Information
Product Description
The EL2160C is a current mode feedback amplifier that
offers wide bandwidth and good video specifications at a
moderately low supply current. It is built using Elantec's
proprietary complimentary bipolar process and is
offered in industry standard pin-outs. Due to the current
feedback architecture, the EL2160C closed-loop 3dB
bandwidth is dependent on the value of the feedback
resistor. First the desired bandwidth is selected 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 3dB
bandwidth is somewhat dependent on the power supply
voltage. As the supply voltage is decreased, internal
junction capacitances increase, causing a reduction 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 highly recommended.
Lead lengths should be as short as possible, below ¼.
The power supply pins must be well bypassed to reduce
the risk of oscillation. A 1.0µF tantalum capacitor in
parallel with a 0.01µF 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 par-
asitic inductance. Similarly, capacitors should be low
inductance for best performance. Use of sockets, partic-
ularly for the SO package, should be avoided. Sockets
add parasitic inductance and capacitance which will
result in peaking and overshoot.
Capacitance at the Inverting Input
Due to the topology of the current feedback amplifier,
stray capacitance at the inverting input will affect the
AC and transient performance of the EL2160C when
operating in the non-inverting configuration. The char-
acteristic curve of gain vs. frequency with variations of
CIN- emphasizes this effect. The curve illustrates how
the bandwidth can be extended to beyond 200MHz with
some additional peaking with an additional 2pF of
capacitance at the VIN- pin for the case of AV = +2.
Higher values of capacitance will be required to obtain
similar effects at higher gains.
In the inverting gain mode, added capacitance at the
inverting input has little effect since this point is at a vir-
tual ground and stray capacitance is therefore not “seen”
by the amplifier.
Feedback Resistor Values
The EL2160C has been designed and specified with
RF=560Ω for AV = +2. This value of feedback resistor
yields extremely flat frequency response with little to no
peaking out to 130MHz. As is the case with all current
feedback amplifiers, wider bandwidth, at the expense of
slight peaking, can be obtained by reducing the value of
the feedback resistor. Inversely, larger values of feed-
back resistor will cause rolloff to occur at a lower
frequency. By reducing RF to 430Ω, bandwidth can be
extended to 170MHz with under 1dB of peaking. Fur-
ther reduction of RF to 360Ω increases the bandwidth to
195MHz with about 2.5dB of peaking. See the curves in
the Typical Performance Curves section which show
3dB bandwidth and peaking vs. frequency for various
feedback resistors and various supply voltages.
Bandwidth vs Temperature
Whereas many amplifier's supply current and conse-
quently 3dB bandwidth drop off at high temperature, the
EL2160C was designed to have little supply current
variations with temperature. An immediate benefit from
this is that the 3dB bandwidth does not drop off drasti-
cally with temperature. With VS = ±15V and AV = +2,
the bandwidth only varies from 150MHz to 110MHz
11
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