EL5178 데이터 시트보기 (PDF) - Intersil
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EL5178 Datasheet PDF : 15 Pages
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EL5178, EL5378
Simplified Schematic
R1
VS+
R3
R4
R2
R7
R8
IN+
IN-
FBP FBN
VB1
CC
R5
R6
VS-
VB2
CC
OUT+
RCD
RCD
R9
OUT-
REF
R10
Description of Operation and Application
Information
Product Description
The EL5178 and EL5378 are wide bandwidth, low power
and single/differential ended to differential output amplifiers.
The EL5178 is a single channel differential amplifier. Since
the IN- pin and REF pin are tired together internally, the
EL5178 can be used as a single ended to differential
converter. The EL5378 is a triple channel differential
amplifier. The EL5378 have a separate IN- pin and REF pin
for each channel. It can be used as single/differential ended
to differential converter. The EL5178 and EL5378 are
internally compensated for closed loop gain of 1 of greater.
Connected in gain of 2 and driving a 1kΩ differential load,
the EL5178 and EL5378 have a -3dB bandwidth of 700MHz.
Driving a 200Ω differential load at gain of 2, the bandwidth is
about 320MHz. The EL5378 is available with a power down
feature to reduce the power while the amplifier is disabled.
Input, Output, and Supply Voltage Range
The EL5178 and EL5378 have been designed to operate
with a single supply voltage of 5V to 10V or a split supplies
with its total voltage from 5V to 10V. The amplifiers have an
input common mode voltage range from -4.3V to 3.4V for
±5V supply. The differential mode input range (DMIR)
between the two inputs is from -2.3V to +2.3V. The input
voltage range at the REF pin is from -3.3V to 3.7V. If the
input common mode or differential mode signal is outside the
above-specified ranges, it will cause the output signal
distorted.
The output of the EL5178 and EL5378 can swing from -3.8V
to +3.8V at 1kΩ differential load at ±5V supply. As the load
resistance becomes lower, the output swing is reduced.
Differential and Common Mode Gain Settings
For EL5178, since the IN- pin and REF pin are bounded
together as the REF pin in an 8-pin package, the signal at
the REF pin is part of the common mode signal and also part
of the differential mode signal. For the true balance
differential outputs, the REF pin must be tired to the same
bias level as the IN+ pin. For a ±5V supply, just tire the REF
pin to GND if the IN+ pin is biased at 0V with a 50Ω or 75Ω
termination resistor. For a single supply application, if the
IN+ is biased to half of the rail, the REF pin should be biased
to half of the rail also.
The gain setting for EL5178 is:
VODM
=
VI
N
+
×
1
+
R-----F----1-R---+--G---R-----F---2-
VODM
=
VI
N
+
×
1
+
2----R-----F-
RG
VOCM = VREF = 0V
Where:
VREF = 0V
RF1 = RF2 = RF
EL5378 have a separate IN- pin and REF pin. It can be used
as a single/differential ended to differential converter. The
voltage applied at REF pin can set the output common mode
voltage and the gain is one.
10
FN7491.1
March 8, 2005
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