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ISL59441IAZ-T13 数据表(PDF) 9 Page - Intersil Corporation

部件名 ISL59441IAZ-T13
功能描述  900MHz Multiplexing Amplifier
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制造商  INTERSIL [Intersil Corporation]
网页  http://www.intersil.com/cda/home
标志 INTERSIL - Intersil Corporation

ISL59441IAZ-T13 数据表(HTML) 9 Page - Intersil Corporation

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9
FN6163.2
September 21, 2005
Application Information
General
The ISL59441 is a 4:1 mux that is ideal as a matrix element
in high performance switchers and routers. The ISL59441 is
optimized to drive 5pF in parallel with a 500
Ω load. The
capacitance can be split between the PCB capacitance and
an external load capacitance. Its low input capacitance and
high input resistance provide excellent 50
Ω or 75Ω
terminations.
Parasitic Effects on Frequency Performance
Capacitance at the Inverting Input
The AC performance of current-feedback amplifiers in the
non-inverting gain configuration is strongly affected by stray
capacitance at the inverting input. Stray capacitance from
the inverting input pin to the output (CF), and to ground (CG),
increase gain peaking and bandwidth. Large values of either
capacitance can cause oscillation. The ISL59441 has been
optimized for a 0.4pF to 0.7pF capacitance (CG).
Capacitance (CF) to the output should be minimized. To
achieve optimum performance the feedback network
resistor(s) must be placed as close to the device as possible.
Trace lengths greater than 1/4 inch combined with resistor
pad capacitance can result in inverting input to ground
capacitance approaching 1pF. Inverting input and output
traces should not run parallel to each other. Small size
surface mount resistors (604 or smaller) are recommended.
Capacitance at the Output
The output amplifier is optimized for capacitance to ground
(CL) directly on the output pin. Increased capacitance
causes higher peaking with an increase in bandwidth. The
optimum range for most applications is ~1.0pF to ~6pF. The
optimum value can be achieved through a combination of
PC board trace capacitance (CT) and an external capacitor
(COUT). A good method to maintain control over the output
pin capacitance is to minimize the trace length (CT) to the
next component, and include a discrete surface mount
capacitor (COUT) directly at the output pin.
Feedback Resistor Values
The AC performance of the output amplifier is optimized with
the feedback resistor network (RF, RG) values
recommended in the application circuits. The amplifier
bandwidth and gain peaking are directly affected by the
value(s) of the feedback resistor(s) in unity gain and gain >1
configurations. Transient response performance can be
tailored simply by changing these resistor values. Generally,
lower values of RF and RG increase bandwidth and gain
peaking. This has the effect of decreasing rise/fall times and
increasing overshoot.
Ground Connections
For the best isolation and crosstalk rejection, the GND pin
and NIC pins must connect to the GND plane.
Application Circuits
FIGURE 25A. GAIN OF 1 APPLICATION CIRCUIT
FIGURE 25B. GAIN OF 2 APPLICATION CIRCUIT
VIN
50
301
CG
-
+
0.4pF < CG < 0.7pF
0.6pF
PC BOARD
CAPACITANCE
*CL: TOTAL LOAD CAPACITANCE
COUT: OUTPUT CAPACITANCE
CT: TRACE CAPACITANCE
COUT
RL = 500Ω
VOUT
0pF
*CL = CT + COUT
CT
1.6pF
VIN
50
205
CG
-
+
205
0.4pF < CG < 0.7pF
0.6pF
PC BOARD
CAPACITANCE
COUT
RL = 500Ω
VOUT
0pF
*CL = CT + COUT
CT
1.6pF
ISL59441


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