16

Figure 7. Recommended ac coupling and data signal termination.

NOTE:

AC coupling capacitors should be used to connect data outputs to data inputs between

the HFBR-772BZ, HFBR-782BZ, and host board ICs (eg ASIC) with either 50

Ω single

ended or 100

Ω differential terminations as shown. The capacitors' value can be reduced

from 100 nF (0603 size) if the data rate and run length are limited.

DATA OUT (+)

HFBR-772BZ

R

50

Ω

DATA OUT (–)

R

50

Ω

R

100

Ω

ASIC

HFBR-782BZ

RDL

100

Ω

DOUT (+)

DOUT (–)

C = 100 nF

C = 100 nF

C = 100 nF

C = 100 nF

Unused receiver

channel outputs

must be terminated

D IN+

D IN–

TRANSMITTER

∆V DIN

–

+

D OUT+

D OUT–

RECEIVER

–

+

∆V DOUT

∆V DI/OH

∆V DI/OL

V DI/O+

V DI/O–

∆V DI/O P-P

∆V DI/OL

–

+

∆V DI/OH

V DI/O REFERS TO

EITHER VDIN OR VDOUT

AS APPROPRIATE

Figure 8. Differential signals.