PI5L100Q datasheet(7/13 Pages) PERICOM

7 / 13 page

PI5L100

Wide-Bandwidth,Low-Voltage

LanSwitch Quad 2:1 Mux/Demux

PS7031F

09/17/04

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Figure 7. Crosstalk vs Frequency

DIV

10.00

NETWORK

A: REF

0.000

[dB]

B: REF

180.0

[deg]

MKR 10 074 746.057 Hz

T/R

519.486m

–90.2501

deg

RBW: 10 kHz

ST: 4.05 sec

RANGE: R = 0, T = 0dBm

PI5L100

XTALK 10 MHz, RL = 50 Ohm

DIV

36.00

START

STOP

1 000 000 . 000 Hz

300 000 000 . 000 Hz

0dB

–10dB

–20dB

–30db

–40dB

–50dB

–60dB

–70dB

–80dB

–90dB

–100dB

+180˚

+144˚

+108˚

+72˚

+36˚

0¡

–36˚

–72˚

–108˚

–144˚

–180˚

MAGNITUDE

PHASE

LANSwitchApplications

The PI5L100 was designed to switch between various standards

such as 10Base-T, 100Base-T, 100VG-AnyLAN, and Token Ring.

Also general purpose applications such as loopback, line termina-

tion, and line clamps that might normally use mechanical relays are

also ideal uses for this LAN Switch (see Figure 11 applications).

Generally speaking, this LAN Switch can be used for data rates to

200 Mbps and data signal levels from 0V to 4.5V.

LAN Standards

Data Rate per twisted pair (UTP)

10Base-T

10 Mbps

100Base-T

100 Mbps

100VG-AnyLAN

25 Mbps

Differential Crosstalk . . . XTALK(DIF)

Adjacent pins cause the most crosstalk because of the interlead

package capacitance which is generally in the order of 0.5pF (pin-

to-pin). It can be seen in Figure 11 that this Evaluation (EV) Board

schematic uses four pairs of switches. Pair 1B/2B are RX1 that

connect to YA and YB. The second pair, 3B/4B, are TX1 and connect

to YC and YB. Pairs 3 and 4 are grounded for this differential

crosstalk test. The purpose of this EV board is to determine the

amount of crosstalk between the transmit and receive pairs in a full

duplex application. Figure 15 shows the scope waveforms. Traces

Applications

1 and 2 are single ended inputs to the differential inputs of the DUT.

Trace 3 is the differential XTALK output which equates to 20LOG

VOUT/VIN = 20LOG 30 mV/5V = –44dB. Since the edge rate is 2ns,

the effective input frequency is equal to 0.3/tR which is ~150 MHz.

So the approximate Differential Crosstalk at 150 MHz is –44dB.

Because pins measured are not adjacent, the differential crosstalk

is typically > 60 dB at 10 MHz. The load resistor (RL) used was 100

( to match the UTP impedance). Increasing the data rate or RL will

also increase differential crosstalk.

VCC Bias Voltage vs RON

To keep RON to a minimum, it is recommended that the VCC voltage

be increased to a voltage between +6.0V and +6.5V (see Figure 13).

The RON vs. VIN curve shows the effect of on-resistance and input

voltage which is exponential. Ideally an input voltage between 0.2V

and 3.6V will keep RONin the flat part of the curve (∆RONor flatness

is ~2 ohms).

Signal Distortion

Distortion of the input signal is equated to 20LOG

∆RON/ RL. So

keeping RON flat as data signal level varies is critical to low

distortion. Also, increasing the data rate increases harmonic distor-

tion which also effects the signal amplitude.

EvaluationBoard

Figure 14 shows the layout for an EV board that can be used for

evaluation. This is a 2-layer board and is one-inch square.

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