CLC5602IM datasheet(11/12 Pages) NSC

11 / 12 page

http://www.national.com

where Zo(5602)(jω) is the output impedance of the

CLC5602 and |Zo(5602)(jω)| << Rm.

The load voltage and current will fall in the ranges:

The CLC5602’s high output drive current and low

distortion make it a good choice for this application.

Full Duplex Cable Driver

The circuit shown in Figure 16 below, operates as a full

duplex cable driver which allows simultaneous transmis-

sion and reception of signals on one transmission line.

The circuit on either side of the transmission line uses are

CLC5602 as a cable driver, and the second CLC5602 as

a receiver. VoA is an attenuated version of VinA, while VoB

is an attenuated version of VinB.

Figure 16: Full Duplex Cable Driver

Rm1 is used to match the transmission line. Rf2 and Rg2

set the DC gain of the CLC5602, which is used in a

difference mode. Rt2 provides good CMRR and DC

offset. The transmitting CLC5602’s are shown in a unity

gain configuration because they consume the least

power of any gain, for a given load. For proper operation

we need Rf2 = Rg2.

The receiver output voltages are:

where A is the attenuation of the cable, Zo(5602)(jω) is the

output impedance of the CLC5602 (see the

Closed-Loop

Output Resistance plot), and

|Zo(5602)(jω)| << Rm1.

We selected the component values as follows:

Rf1 = 1.0kΩ, the recommended value for the

CLC5602 at unity gain

Rm1 = Zo = 50Ω, the characteristic impedance

of the transmission line

Rf2 = Rg2 = 750Ω ≥ Rm1, the recommended

value for the CLC5602 at Av = 2

These values give excellent isolation from the other input:

The CLC5602 provides large output current drive, while

consuming little supply current, at the nominal bias point.

It also produces low distortion with large signal swings

and heavy loads. These features make the CLC5602 an

excellent choice for driving transmission lines.

Rf1

Rt1

Rf2

1/2

CLC5602

VinA

Rg2

Rt2

Rm1

VoB

Rf1

Rt1

Rf2

VinB

Rg2

Rt2

Rm1

VoA

1/2

CLC5602

1/2

CLC5602

1/2

CLC5602

R(R

|| R

) –

Ω

38dB, f

5.0MHz

oA(B)

inB(A)

≈−

Z(j )

outA(B)

inA(B)

inB(A)

o(5602)

≈⋅ +

⋅ −













Vn V

≤⋅

≤

max

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