EL5372 INTERSIL [Intersil Corporation], EL5372 Datasheet - Page 11

• Manufacturer Part Number: EL5372
• Description: 250MHz Differential Line Receivers
• Manufacturer: INTERSIL [Intersil Corporation]

Description of Operation and Application
Information
Product Description
The EL5172 and EL5372 are wide bandwidth, low power
and single/differential ended to single ended output
amplifiers. The EL5172 is a single channel differential to
single ended amplifier. The EL5372 is a triple channel
differential to single ended amplifier. The EL5172 and
EL5372 are internally compensated for closed loop gain of
+1 or greater. Connected in gain of 1 and driving a 500Ω
load, the EL5172 and EL5372 have a -3dB bandwidth of
250MHz. Driving a 150Ω load at gain of 2, the bandwidth is
about 50MHz. The bandwidth at the REF input is about
450MHz. The EL5172 and EL5372 are available with a
power-down feature to reduce the power while the amplifier
is disabled.
Input, Output and Supply Voltage Range
The EL5172 and EL5372 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 3.3V for
±5V supply. The differential mode input range (DMIR)
between the two inputs is about from -2.3V to +2.3V. The
input voltage range at the REF pin is from -3.6V to 3.3V. If
the input common mode or differential mode signal is outside
the above-specified ranges, it will cause the output signal to
be distorted.
The output of the EL5172 and EL5372 can swing from -3.8V
to 3.6V at 500Ω load at ±5V supply. As the load resistance
becomes lower, the output swing is reduced respectively.
Over All Gain Settings
The gain setting for the EL5172 and the EL5372 is similar to
the conventional operational amplifier. The output voltage is
equal to the difference of the inputs plus V
times the gain.
V
O
=
(
V
IN
+ V
V
V
–
V
REF
R
IN
FB
IN
G
+
-
IN
-
+
V
+
+
-
-
REF
FIGURE 23.
)
R
×
Σ
F
⎛
⎜
⎝
EN
11
1
+
------- -
R
R
G/B
G
F
⎞
⎟
⎠
REF
and then
V
O
EL5172, EL5372
Choice of Feedback Resistor and Gain Bandwidth
Product
For applications that require a gain of +1, no feedback
resistor is required. Just short the OUT pin to the FB pin. For
gains greater than +1, the feedback resistor forms a pole
with the parasitic capacitance at the inverting input. As this
pole becomes smaller, the amplifier's phase margin is
reduced. This causes ringing in the time domain and
peaking in the frequency domain. Therefore, R
maximum value that should not be exceeded for optimum
performance. If a large value of R
capacitor in the few Pico farad range in parallel with R
help to reduce the ringing and peaking at the expense of
reducing the bandwidth.
The bandwidth of the EL5172 and EL5372 depends on the
load and the feedback network. R
parallel with the load for gains other than +1. As this
combination gets smaller, the bandwidth falls off.
Consequently, R
be exceeded for optimum bandwidth performance. For a
gain of +1, R
optimum response is obtained with R
1kΩ. For A
and the frequency response is very flat.
The EL5172 and EL5372 have a gain bandwidth product of
100MHz. For gains ≥5, its bandwidth can be predicted by
Equation 1:
Gain
Driving Capacitive Loads and Cables
The EL5172 and EL5372 can drive 56pF capacitance in
parallel with 500Ω load to ground with 4dB of peaking at gain
of +1. If less peaking is desired in applications, a small
series resistor (usually between 5Ω to 50Ω) can be placed in
series with each output to eliminate most peaking. However,
this will reduce the gain slightly. If the gain setting is greater
than 1, the gain resistor R
for any gain loss which may be created by the additional
series resistor at the output.
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, a back-termination series resistor at the
amplifier's output will isolate the amplifier from the cable and
allow extensive capacitive drive. However, other applications
may have high capacitive loads without a back-termination
resistor. Again, a small series resistor at the output can help
to reduce peaking.
Disable/Power-Down
The EL5172 and EL5372 can be disabled and its outputs
placed in a high impedance state. The turn-off time is about
1.4µs and the turn-on time is about 150ns. When disabled,
the amplifier's supply current is reduced to 80µA for I
×
BW
V
=
= 2 and R
100MHz
F
= 0 is optimum. For the gains other than +1,
F
also has a minimum value that should not
F
= R
G
G
can then be chosen to make up
= 1kΩ, the BW is about 80MHz
F
F
must be used, a small
and R
F
between 500Ω to
G
appear in
F
January 25, 2008
has some
S
(EQ. 1)
FN7311.8
F
+ and
can