ADN4604ASVZ datasheet(23/40 Pages) AD

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ADN4604

Rev. 0 | Page 23 of 40

TERMINATION

The inputs and outputs include integrated 50 Ω termination

resistors. For applications that require external termination

resistors, the internal resistors can be disabled. For example,

disabling the integrated 50 Ω termination resistors allows

alternative termination values such as 75 Ω as shown in

Figure 45.

Note that the integrated 50 Ω termination resistors are optimal

for high data rate digital signaling. Disabling the terminations

can reduce the overall performance.

The termination control is separated by quadrants (North =

Outputs[15:8], South = Outputs[7:0], East = Inputs[15:8], and

West = Inputs[7:0]).

Table 16 shows the termination control register. A Logic 0

enables the terminations for the respective quadrant. A Logic 1

disables the terminations for the respective quadrant. The

terminations are enabled by default.

CML

Ω

TTIx

TTOx

Ω

VTTOx

Ω

VEE

ADN4604

Ω

Figure 45. 75 Ω to 50 Ω Impedance Translator.

Table 16. Termination Control Register

Address

Default

Bit

Bit Name

Description

0xF0

0x00

Termination control

TXN_TERM

Output[15:8] (North) termination control

0: Terminations enabled

1: Terminations disabled

TXS_TERM

Output[7:0] (South) termination control

0: Terminations enabled

1: Terminations disabled

RXE_TERM

Input[15:8] (East) termination control

0: Terminations enabled

1: Terminations disabled

RXW_TERM

Input[7:0] (West) termination control

0: Terminations enabled

1: Terminations disabled

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