AD9546SLASHPCBZ datasheet(79/205 Pages) AD

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Data Sheet

AD9546

Rev. 0 | Page 79 of 205

DIFFERENTIAL MODE

When configured for differential operation, the input receivers

accommodate either ac-coupled or dc-coupled input signals per

Table 48. Bits[3:2] are only effective when the corresponding

differential mode is in effect.

Table 48. Differential Mode Settings

Bits[3:2]

Reference

Description

0x0300

REFA, REFAA

AC-coupled (default)

REFA, REFAA

DC-coupled

REFA, REFAA

DC-coupled LVDS

Unused

0x0304

REFB, REFBB

AC-coupled interface

(default)

REFB, REFBB

DC-coupled 1.2 V

CMOS

REFB, REFBB

DC-coupled 1.8 V

CMOS

Unused

The ac-coupled mode has an internal bias termination on each

differential input pin, which has a Thevenin equivalent of a

0.6 V dc source in series with a 23.5 kΩ series. The dc-coupled

mode expects the external driver to provide a 0.6 V common-

mode bias. The dc-coupled LVDS mode expects a 1.2 V

common-mode source with LVDS signal levels, as delivered by

a standard LVDS driver.

For differential mode operating frequencies in excess of

10.24 MHz, use the ac-coupled differential mode and connect

the reference input clock signal to the reference input pins

through a series dc blocking capacitor. For differential mode

operating frequencies < 10.24 MHz, use dc-coupled differential

mode. For direct connection of a low frequency (<10.24 MHz)

LVDS input reference source, use dc-coupled LVDS mode,

which provides the necessary level shifting.

DC-Coupled LVDS (<10.24 MHz) Interface

Use Figure 35 to make a dc-coupled connection to a standard

LVDS driver having a 1.2 V common-mode output bias. Be

sure to select the dc-coupled LVDS mode per Table 48, which

provides the appropriate internal level shifting for the input

receiver. This configuration supports input frequencies up to

10.24 MHz.

Differential AC Coupling (>10.24 MHz)

For differential input signals in excess of 10.24 MHz, refer to

Figure 36 to make an ac-coupled connection to an external

driver. Be sure to select the ac-coupled mode per Table 48.

Differential DC Coupling (>10.24 MHz)

Use Figure 37 to make a dc-coupled connection to a differential

driver having a 0.6 V common-mode output bias. Be sure to

select the dc-coupled mode per Table 48.

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