EL5170ISZ データシートの表示（PDF） - Renesas Electronics
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EL5170ISZ Datasheet PDF : 14 Pages
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EL5170, EL5370
Power Supply Bypassing and Printed Circuit
Board Layout
As with any high frequency device, a good printed circuit board
layout is necessary for optimum performance. Lead lengths
should be as sort as possible. The power supply pin must be well
bypassed to reduce the risk of oscillation. For normal single
supply operation, where the VS- pin is connected to the ground
plane, a single 4.7µF tantalum capacitor in parallel with a 0.1µF
ceramic capacitor from VS+ to GND will suffice. This same
capacitor combination should be placed at each supply pin to
ground if split supplies are to be used. In this case, the VS- pin
becomes the negative supply rail.
For good AC performance, parasitic capacitance should be kept
to minimum. Use of wire wound resistors should be avoided
because of their additional series inductance. Use of sockets
should also be avoided if possible. Sockets add parasitic
inductance and capacitance that can result in compromised
performance. Minimizing parasitic capacitance at the amplifier’s
inverting input pin is very important. The feedback resistor
should be placed very close to the inverting input pin. Strip line
design techniques are recommended for the signal traces.
Typical Applications
0
IN+
EL5170/
EL5370
IN-
50
50
50
ZO = 100
50
VFB
VIN EL5172/
EL5372
VINB
VREF
VOUT
FIGURE 20. TWISTED PAIR DRIVER
50
VIN
IN+ VOUT +
VIN
EL5170/EL5370
IN- VOUTB -
50COAX
50
VREF
50COAX
50
50
0
VFB
VIN
EL5172/EL5372
VINB
VREF
VOUT
FIGURE 21. DUAL COAXIAL CABLE DRIVER
10V
10k
10k
VIN
IN+
50
EL5170/EL5370
IN-
VREF
50
10k
10k
TWISTED PAIR
ZO = 100
100 VOUT
FN7309 Rev 10.00
August 14, 2015
FIGURE 22. SINGLE SUPPLY TWISTED PAIR DRIVER
Page 10 of 14
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