EL5392ACUZ-T13 Intersil, EL5392ACUZ-T13 Datasheet - Page 13

• Manufacturer Part Number: EL5392ACUZ-T13
• Description: IC AMP CFA TRPL 600MHZ 16-QSOP
• Manufacturer: Intersil

Specifications of EL5392ACUZ-T13

• Amplifier Type: Current Feedback
• Number Of Circuits: 3
• Slew Rate: 2300 V/µs
• -3db Bandwidth: 600MHz
• Current - Input Bias: 4µA
• Voltage - Input Offset: 1000µV
• Current - Supply: 6mA
• Current - Output / Channel: 120mA
• Voltage - Supply, Single/dual (±): 5 V ~ 10 V, ±2.5 V ~ 5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Gain Bandwidth Product: -

Power Supply Bypassing and Printed Circuit
Board Layout
As with any high frequency device, good printed circuit
board layout is necessary for optimum performance. Low
impedance ground plane construction is essential. Surface
mount components are recommended, but if leaded
components are used, lead lengths should be as short as
possible. The power supply pins must be well bypassed to
reduce the risk of oscillation. The combination of a 4.7µF
tantalum capacitor in parallel with a 0.01µF capacitor has
been shown to work well when placed at each supply pin.
For good AC performance, parasitic capacitance should be
kept to a minimum, especially at the inverting input. (See the
Capacitance at the Inverting Input section) Even when
ground plane construction is used, it should be removed
from the area near the inverting input to minimize any stray
capacitance at that node. Carbon or Metal-Film resistors are
acceptable with the Metal-Film resistors giving slightly less
peaking and bandwidth because of additional series
inductance. Use of sockets, particularly for the SOIC
(0.150") package, should be avoided if possible. Sockets
add parasitic inductance and capacitance which will result in
additional peaking and overshoot.
Disable/Power-Down
The EL5392A amplifier can be disabled placing its output in
a high impedance state. When disabled, the amplifier supply
current is reduced to < 450µA. The EL5392A is disabled
when its CE pin is pulled up to within 1V of the positive
supply. Similarly, the amplifier is enabled by floating or
pulling its CE pin to at least 3V below the positive supply. For
±5V supply, this means that an EL5392A amplifier will be
enabled when CE is 2V or less, and disabled when CE is
above 4V. Although the logic levels are not standard TTL,
this choice of logic voltages allows the EL5392A to be
enabled by tying CE to ground, even in 5V single supply
applications. The CE pin can be driven from CMOS outputs.
Capacitance at the Inverting Input
Any manufacturer’s high-speed voltage- or current-feedback
amplifier can be affected by stray capacitance at the
inverting input. For inverting gains, this parasitic capacitance
has little effect because the inverting input is a virtual
ground, but for non-inverting gains, this capacitance (in
conjunction with the feedback and gain resistors) creates a
pole in the feedback path of the amplifier. This pole, if low
enough in frequency, has the same destabilizing effect as a
zero in the forward open-loop response. The use of large-
value feedback and gain resistors exacerbates the problem
by further lowering the pole frequency (increasing the
possibility of oscillation.)
The EL5392A has been optimized with a 375Ω feedback
resistor. With the high bandwidth of these amplifiers, these
resistor values might cause stability problems when
combined with parasitic capacitance, thus ground plane is
13
EL5392A
not recommended around the inverting input pin of the
amplifier.
Feedback Resistor Values
The EL5392A has been designed and specified at a gain of
+2 with R
resistor gives 300MHz of -3dB bandwidth at A
of peaking. With A
bandwidth with 1dB of peaking. Since the EL5392A is a
current-feedback amplifier, it is also possible to change the
value of R
Frequency Response for Various R
peaking can be easily modified by varying the value of the
feedback resistor.
Because the EL5392A is a current-feedback amplifier, its
gain-bandwidth product is not a constant for different closed-
loop gains. This feature actually allows the EL5392A to
maintain about the same -3dB bandwidth. As 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 R
resulting in only a slight loss of bandwidth with increased
closed-loop gain.
Supply Voltage Range and Single-Supply
Operation
The EL5392A has been designed to operate with supply
voltages having a span of greater than 5V and less than 10V.
In practical terms, this means that the EL5392A will operate
on dual supplies ranging from ±2.5V to ±5V. With single-
supply, the EL5392A will operate from 5V to 10V.
As supply voltages continue to decrease, it becomes
necessary to provide input and output voltage ranges that
can get as close as possible to the supply voltages. The
EL5392A has an input range which extends to within 2V of
either supply. So, for example, on ±5V supplies, the
EL5392A has an input range which spans ±3V. The output
range of the EL5392A is also quite large, extending to within
1V of the supply rail. On a ±5V supply, the output is therefore
capable of swinging from -4V to +4V. Single-supply output
range is larger because of the increased negative swing due
to the external pull-down resistor to ground.
Video Performance
For good video performance, an amplifier is required 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 150Ω, because of the change in output current with DC
level. Previously, good differential gain could only be
achieved by running high idle currents through the output
transistors (to reduce variations in output impedance.)
These currents were typically comparable to the entire 6mA
supply current of each EL5392A amplifier. Special circuitry
has been incorporated in the EL5392A to reduce the
F
below the specified 375Ω and still retain stability,
F
F
approximately 375Ω. This value of feedback
to get more bandwidth. As seen in the curve of
V
=-2, an R
F
of 375Ω gives 275MHz of
F
and R
G
, bandwidth and
V
=2 with 2dB
March 9, 2006
FN7194.1