Rainbow-electronics CLC001 Uživatelský manuál stáhnout pdf (Strana 5)

Device Operation

INPUT INTERFACING

Numerous input configurations exist for applying PECL,

LVPECL, and LVDS signals to the input of the CLC001.

Inputs may be single-ended or differential, AC or DC

coupled.

The V

pin may be used to provide a DC bias voltage to

the inputs. Leave this pin as a no connect when no bias is

needed. Note that DC-coupled inputs such as direct

LVDS and LVPECL connections are self-biasing and do

not require use of the V

pin. I

, the current produced

by the V

pin, depends on R

REF

. For a given R

REF

, the

current will remain constant, and the bias voltage is

determined by the value of resistance, R

, between the

pin and ground.

Figure 3

and

Figure 4

show how R

corresponds to some common V

values with R

REF

held

at 1.91 kΩ and 1.5 kΩ, respectively. Some common input

configurations are shown in

Figure 5

through

Figure 9

DS101329-11

FIGURE 3. R

vs. V

for R

REF

= 1.91 kΩ

DS101329-12

FIGURE 4. R

vs. V

for R

REF

= 1.5 kΩ

CLC001

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