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EL2170CW Schematic ( PDF Datasheet ) - Elantec Semiconductor

Teilenummer EL2170CW
Beschreibung 70 MHz/1 mA Current Mode Feedback Amplifiers
Hersteller Elantec Semiconductor
Logo Elantec Semiconductor Logo 




Gesamt 16 Seiten
EL2170CW Datasheet, Funktion
EL2170C EL2270C EL2470C
70 MHz 1 mA Current Mode Feedback Amplifiers
Features
 Single (EL2170C) dual
(EL2270C) and quad (EL2470C)
topologies
 1 mA supply current (per
amplifier)
 70 MHz b3 dB bandwidth
 Tiny SOT23-5 Package
(EL2170C)
 Low cost
 Single- and dual-supply
operation down to g1 5V
 0 15% 0 15 diff gain diff phase
into 150X
 800 V ms slew rate
 Large output drive current
100 mA (EL2170C)
55 mA (EL2270C)
55 mA (EL2470C)
 Also available with disable in
single (EL2176C) and dual
(EL2276C)
 Higher speed EL2180C EL2186C
family also available (3 mA
250 MHz) in single dual and
quad
General Description
The EL2170C EL2270C EL2470C are single dual quad cur-
rent-feedback operational amplifiers which achieve a b3 dB
bandwidth of 70 MHz at a gain of a1 while consuming only
1 mA of supply current per amplifier They will operate with
dual supplies ranging from g1 5V to g6V or from single sup-
plies ranging from a3V to a12V In spite of their low supply
current the EL2270C and the EL2470C can output 55 mA while
swinging to g4V on g5V supplies The EL2170C can output
100 mA with similar output swings These attributes make the
EL2170C EL2270C EL2470C excellent choices for low power
and or low voltage cable-driver HDSL or RGB applications
For applications where board space is extremely critical the
EL2170C is available in the tiny 5-Lead SOT23 package which
has a footprint 28% the size of an 8-Lead SOIC The EL2170C
EL2270C EL2470C are each also available in industry standard
pinouts in PDIP and SOIC packages
For Single and Dual applications with disable consider the
EL2176C (8-Pin Single) or EL2276C (14-Pin Dual) For higher
speed applications where power is still a concern consider the
EL2180C El2186C family which also comes in similar Single
Dual Triple and Quad configurations The EL2180C EL2186C
family provides a b3 dB bandwidth of 250 MHz while consum-
ing 3 mA of supply current per amplifier
Connection Diagrams
Applications
 Low power battery applications
 HDSL amplifiers
 Video amplifiers
 Cable drivers
 RGB amplifiers
 Test equipment amplifiers
 Current to voltage converters
EL2170C SO P-DIP
EL2270C SO P-DIP
EL2170C SOT23-5
EL2470C SO P-DIP
2170 – 1
Ordering Information
Part No Temp Range Package Outline
EL2170CN b40 C to a85 C 8-Pin PDIP MDP0031
EL2170CS b40 C to a85 C 8-Pin SOIC MDP0027
EL2170CW b40 C to a85 C 5-Pin SOT23 MDP0038
EL2270CN b40 C to a85 C 8-Pin PDIP MDP0031
EL2270CS b40 C to a85 C 8-Pin SOIC MDP0027
EL2470CN b40 C to a85 C 14-Pin PDIP MDP0031
EL2470CS b40 C to a85 C 14-Pin SOIC MDP0027
Top View
2170 – 46
See Ordering Information section of
databook
2170 – 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
1995 Elantec Inc






EL2170CW Datasheet, Funktion
EL2170C EL2270C EL2470C
70 MHz 1 mA Current Mode Feedback Amplifiers
Typical Performance Curves Contd
Voltage and Current
Noise vs Frequency
2nd and 3rd Harmonic
Distortion vs Frequency
Output Voltage
vs Frequency
2170 – 14
b3 dB Bandwith and Peaking
vs Supply Voltage for
Various Non-Inverting Gains
2170 – 15
b3 dB Bandwith and Peaking
vs Supply Voltage for
Various Inverting Gains
2170 – 16
Output Voltage Swing
vs Supply Voltage
Supply Current vs
Supply Voltage
2170 – 17
2170 – 18
Common-Mode Input Range
vs Supply Voltage
Slew Rate vs
Supply Voltage
2170 – 19
2170 – 20
2170 – 21
2170 – 22
6

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EL2170CW pdf, datenblatt
EL2170C EL2270C EL2470C
70 MHz 1 mA Current Mode Feedback Amplifiers
Applications Information Contd
Video Performance has also been measured with
a 500X load at a gain of a1 Under these condi-
tions the EL2170C EL2270C EL2470C have dG
and dP specifications of 0 01% and 0 02 respec-
tively while driving 500 X at AV e a1
Output Drive Capability
In spite of its low 1 mA of supply current the
EL2170C is capable of providing a minimum of
g80 mA of output current Similarly each am-
plifier of the EL2270C and the EL2470C is capa-
ble of providing a minimum of g50 mA These
output drive levels are unprecedented in amplifi-
ers running at these supply currents With a min-
imum g80 mA of output drive the EL2170C is
capable of driving 50X loads to g4V making it
an excellent choice for driving isolation trans-
formers in telecommunications applications
Similarly the g50 mA minimum output drive of
each EL2270C and EL2470C amplifier allows
swings of g2 5V into 50X loads
Driving Cables and Capacitive Loads
When used as a cable driver double termination
is always recommended for reflection-free per-
formance For those applications the back-termi-
nation series resistor will decouple the EL2170C
EL2270C EL2470C from the cable and allow ex-
tensive capacitive drive However other applica-
tions may have high capacitive loads without a
back-termination resistor In these applications a
small series resistor (usually between 5X and
50X) 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 EL2170C EL2270C EL2470C have no inter-
nal current-limiting 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 destruc-
tion of the device
Power Dissipation
With the high output drive capability of the
EL2170C EL2270C EL2470C it is possible to
exceed the 150 C Absolute Maximum junction
temperature under certain very high load current
conditions Generally speaking when RL falls be-
low about 25X it is important to calculate the
maximum junction temperature (TJMAX) for the
application to determine if power-supply volt-
ages load conditions or package type need to be
modified for the EL2170C EL2270C EL2470C to
remain in the safe operating area These parame-
ters are calculated as follows
TJMAX e TMAX a (iJA n PDMAX)
1
where
TMAX
iJA
n
e Maximum Ambient Temperature
e Thermal Resistance of the Package
e Number of Amplifiers in the Pack-
age
PDMAX e Maximum Power Dissipation of
Each Amplifier in the Package
PDMAX for each amplifier can be calculated as
follows
PDMAX e (2 VS ISMAX) a
(VS b VOUTMAX) (VOUTMAX RL)) 2
where
VS
ISMAX
e Supply Voltage
e Maximum Supply Current of 1
Amplifier
VOUTMAX e Max Output Voltage of the Ap-
plication
RL e Load Resistance
12

12 Page





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