參數(shù)資料
型號(hào)： EL2276CS-T7
廠商： INTERSIL CORP
元件分類： 音頻／視頻放大
英文描述： 70MHz/1mA Current Mode Feedback Amp w/Disable
中文描述： 1 CHANNEL, VIDEO AMPLIFIER, PDSO14
封裝： SOIC-14
文件頁(yè)數(shù)： 3/20頁(yè)
文件大?。?/td> 359K
代理商： EL2276CS-T7
EL2176CEL2276C
70 MHz1 mA Current Mode Feedback Amp wDisable
Applications Information
Contd
back and gain resistors further exacerbates the
problem by further lowering the pole frequency
The EL2176CEL2276C have been specially de-
signed to reduce power dissipation in the feed-
back network by using large 10 k
X feedback and
gain resistors With the high bandwidths of these
amplifiers these large resistor values would nor-
mally cause stability problems when combined
with parasitic capacitance but by internally can-
celing the effects of a nominal amount of parasit-
ic capacitance
the EL2176CEL2276C remain
very stable For less experienced users this fea-
ture makes the EL2176CEL2276C much more
forgiving and therefore easier to use than other
products not incorporating this proprietary cir-
cuitry
The experienced user with a large amount of PC
board layout experience may find in rare cases
that the EL2176CEL2276 C have less band-
width than expected In this case the inverting
input may have less parasitic capacitance than
expected by the internal compensation circuitry
of the EL2176CEL2276C The reduction of feed-
back resistor values (or the addition of a very
small amount of external capacitance at the in-
verting input eg
05 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 EL2176CEL2276C have been designed and
specified at gains of a1 and a2 with RF e
10 k
X This value of feedback resistor gives
70 MHz of b3 dB bandwidth at AV ea1 with
about 15 dB of peaking and 60 MHz of b3dB
bandwidth at AV ea2 with about 05 dB of
peaking Since the EL2176CEL2276C are cur-
rent-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 EL2176C is a current-feedback am-
plifier the gain-bandwidth product is not a con-
stant for different closed-loop gains This feature
actually allows the EL2176CEL2276C to main-
tain about the same b3 dB bandwidth regard-
less of closed-loop gain However as closed-loop
gain is increased bandwidth decreases slightly
while stability increases
Since the loop stability is improving with higher
closed-loop gains it becomes possible to reduce
the value of RF below the specified 10 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 EL2176CEL2276C have been designed to
operate with supply voltages having a span of
greater than 3V and less than 12V In practical
terms this means that the EL2176CEL2276C
will operate on dual supplies ranging from g15V
to g6V With a single-supply the EL2176C will
operate 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 EL2176CEL2276C
have an input voltage range that extends to with-
in 1V of either supply So for example on a sin-
gle a5V supply the EL2176CEL2276C have an
input range which spans from 1V to 4V The out-
put range of the EL2176C EL2276C 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
output range is even larger because of the in-
creased negative swing due to the external pull-
down resistor to ground On a single a5V sup-
ply output voltage range is about 03V 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 150
X be-
cause of the change in output current with DC
level Until the EL2176CEL2276C good Differ-
ential Gain could only be achieved by running
high idle currents through the output transistors
(to reduce variations in output impedance)
These currents were typically in excess of the
11
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