EL5174 Просмотр технического описания (PDF) - Intersil
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EL5174 Datasheet PDF : 15 Pages
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EL5174, EL5374
Simplified Schematic
R1
VS+
R3
R4
R2
R7
R8
IN+
IN-
FBP FBN
VB1
OUT+
RCD
RCD
REF
R9
R10
VB2
OUT-
CC
CC
R5
R6
VS-
Description of Operation and Application
Information
Product Description
The EL5174 and EL5374 are wide bandwidth, low power
and single/differential ended to differential output amplifiers.
The EL5174 is a single channel differential amplifier. Since
the IN- pin and REF pin are tied together internally, the
EL5174 can be used as a single-ended to differential
converter. The EL5374 is a triple channel differential
amplifier. The EL5374 has a separate IN- pin and REF pin
for each channel. It can be used as single/differential ended
to differential converter. The EL5174 and EL5374 are
internally compensated for closed loop gain of +1 of greater.
Connected in a gain of 1 and driving a 1kΩ differential load,
the EL5174 and EL5374 have a -3dB bandwidth of 550MHz.
Driving a 200Ω differential load at gain of 2, the bandwidth is
about 130MHz. The EL5374 is available with a power-down
feature to reduce the power while the amplifier is disabled.
Input, Output and Supply Voltage Range
The EL5174 and EL5374 have been designed to operate
with a single supply voltage of 5V to 10V or 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 to
become distorted.
The output of the EL5174 and EL5374 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 EL5174, since the IN- pin and REF pin are bound
together as the REF pin in an 8 Ld 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 tied to the same bias level as
the IN+ pin. For a ±5V supply, just tie 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 EL5174 is expressed in Equation 1:
VODM
=
VIN
+
×
⎛
⎜
⎝
1
+
R-----F----1--R--+--G---R-----F---2- ⎠⎟⎞
VODM
=
VIN+
=
⎛
⎜
⎝
1
+
-2-R--R---G--F- ⎠⎟⎞
(EQ. 1)
VOCM = VREF = 0V
Where:
VREF = 0V
RF1 = RF2 = RF
The EL5374 has 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.
The gain setting for EL5374 is expressed in Equation 2:
VODM
=
(
VI
N
+
–
VI
N
-
)
×
⎛
⎜
⎝
1
+
R-----F----1-R---+--G---R-----F---2- ⎠⎟⎞
VODM
=
(
VI
N
+
–
VI
N
-
)
×
⎛
⎜
⎝
1
+
2--R--R---G--F- ⎠⎟⎞
(EQ. 2)
VOCM = VREF
Where:
RF1 = RF2 = RF
11
FN7313.7
August 3, 2010
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