CLC5602IM datasheet(10/12 Pages) NSC

10 / 12 page

http://www.national.com

Figure 12: Lowpass Filter Topology

Figure 13: Design Equations

This example illustrates a lowpass filter with Q = 0.707

and corner frequency fc = 10MHz. A Q of 0.707 was

chosen to achieve a maximally flat, Butterworth

response. Figure 14 indicates the filter response.

Figure 14: Lowpass Response

Differential Line Driver With Load

Impedance Conversion

The circuit shown in the

Typical Application schematic

on the front page and in Figure 15, operates as a

differential line driver. The transformer converts the load

impedance to a value that best matches the CLC5602’s

output capabilites. The single-ended input signal is

converted to a differential signal by the CLC5602. The

line’s characteristic impedance is matched at both the

input and the output. The schematic shows Unshielded

Twisted Pair for the transmission line; other types of lines

can also be driven.

Figure 15: Differential Line Driver wtih

Load Impedance Conversion

Set up the CLC5602 as a difference amplifier:

Make the best use of the CLC5602’s output drive

capability as follows:

where Req is the transformed value of the load imped-

ance, Vmax is the Output Voltage Range, and Imax is the

maximum Output Current.

Match the line’s characteristic impedance:

Select the transformer so that it loads the line with a

value very near Zo over frequency range. The output

impedance of the CLC5602 also affects the match. With

an ideal transformer we obtain:

Frequency (Hz)

-21

-15

-9

-3

10M

100M

Gain

Corner frequency

RR C C

(1 K)

For R

R and C

(3 K)

12 1 2

== +

−

=⋅











 =⋅

meq

max

+= ⋅

meq

Return Loss

20 log

,dB

o 5602

=− ⋅

⋅

()

() ω

1/2

CLC5602

Rg2

Rt2

Rf2

Rf1

Rg1

1/2

CLC5602

Vin

Rt1

Rm/2

UTP

Req

1:n

Vd/2

-Vd/2

Ω

0.1

µF

Vin

Ω

0.1

µF

0.1

µF

Ω

+5V

0.1

µF

100

Ω

1.698k

Ω

158

Ω

158

Ω

100pF

1/2

CLC5602

CLC5602IM Datasheet(PDF) 10 Page - National Semiconductor (TI)

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