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PDF EL2270CN Data sheet ( Hoja de datos )
| Número de pieza | EL2270CN | |
| Descripción | 70 MHz/1 mA Current Mode Feedback Amplifiers | |
| Fabricantes | Elantec Semiconductor | |
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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
1 page  
EL2170C EL2270C EL2470C
70 MHz 1 mA Current Mode Feedback Amplifiers
Typical Performance Curves
Non-Inverting
Frequency Response (Gain)
Non-Inverting
Frequency Response (Phase)
Frequency Response for
Various RF and RG
Inverting Frequency
Response (Gain)
2170 – 5
Inverting Frequency
Response (Phase)
2170 – 6
2170 – 7
Frequency Response for
Various RL and CL
2170 – 8
Transimpedance (ROL)
PSRR and CMRR
2170 – 9
Frequency Response
for Various CINb
2170 – 10
2170 – 11
2170 – 12
2170 – 13
5
5 Page 
EL2170C EL2270C EL2470C
70 MHz 1 mA Current Mode Feedback Amplifiers
Applications Information Contd
The experienced user with a large amount of PC
board layout experience may find in rare cases
that the EL2170C EL2270C EL2470C have less
bandwidth than expected The reduction of feed-
back resistor values (or the addition of a very
small amount of external capacitance at the in-
verting input e g 0 5 pF) will increase band-
width as desired Please see the curves for Fre-
quency Response for Various RF and RG and
Frequency Response for Various CINb
Feedback Resistor Values
The EL2170C EL2270C EL2470C have been de-
signed and specified at gains of a1 and a2 with
RF e 1 kX This value of feedback resistor gives
70 MHz of b3 dB bandwidth at AV e a1 with
about 1 5 dB of peaking and 60 MHz of b3 dB
bandwidth at AV e a2 with about 0 5 dB of
peaking Since the EL2170C EL2270C EL2470C
are current-feedback amplifiers 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 EL2170C EL2270C EL2470C are
current-feedback amplifiers their gain-band-
width product is not a constant for different
closed-loop gains This feature actually allows
the EL2170C EL2270C EL2470C to maintain
about the same b3 dB bandwidth regardless of
closed-loop gain However as closed-loop gain is
increased bandwidth decreases slightly while sta-
bility increases Since the loop stability is im-
proving with higher closed-loop gains it becomes
possible to reduce the value of RF below the spec-
ified 1 kX 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 EL2170C EL2270C EL2470C have been de-
signed to operate with supply voltages having a
span of greater than 3V and less than 12V In
practical terms this means that the EL2170C
EL2270C EL2470C will operate on dual supplies
ranging from g1 5V to g6V With a single-sup-
ply the EL2170C EL2270C EL2470C will oper-
ate from a3V to a12V
As supply voltages continue to decrease it be-
comes necessary to provide input and output
voltage ranges that can get as close as possible to
the supply voltages The EL2170C EL2270C
EL2470C have an input voltage range that ex-
tends to within 1V of either supply So for exam-
ple on a single a5V supply the EL2170C
EL2270C EL2470C have an input range which
spans from 1V to 4V The output range of the
EL2170C EL2270C EL2470C is also quite large
extending to within 1V of the supply rail On a
g5V supply the output is therefore capable of
swinging from b4V to a4V Single-supply out-
put range is even larger because of the increased
negative swing due to the external pull-down re-
sistor to ground On a single a5V supply output
voltage range is about 0 3V to 4V
Video Performance
For good video performance an amplifier is re-
quired 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 150X be-
cause of the change in output current with DC
level Until the EL2170C EL2270C EL2470C
good Differential Gain could only be achieved by
running high idle currents through the output
transistors (to reduce variations in output imped-
ance) These currents were typically more than
the entire 1 mA supply current of each EL2170C
EL2270C EL2470C amplifier Special circuitry
has been incorporated in the EL2170C
EL2270C EL2470C to reduce the variation of
output impedance with current output This re-
sults in dG and dP specifications of 0 15% and
0 15 while driving 150X at a gain of a2
11
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