Datasheet

ADN8102

Rev. B | Page 24 of 36

SELECTIVE SQUELCH AND DISABLE

Each transmitter is equipped with output disable and output

squelch controls. Disable is a full power-down state: the trans-

mitter current is reduced to zero, and the output pins pull up

to V

TTO

, but there is a delay of approximately 1 μs associated

with re-enabling the transmitter. The output disable control is

accessed through the EN bit (Bit 4) of the OUT_A/OUT_B

configuration registers through the I

C control interface.

Squelch is not a full power-down state but a state in which only

the output current is reduced to zero and the output pins pull

up to V

TTO

, and there is a much smaller delay to bring back the

output current. The output squelch and the output disable control

can both be accessed through the OUT_A/OUT_B squelch

control registers, with the top nibble representing the squelch

control for one entire output port, and the bottom nibble

representing the output disable for one entire output port. The

ports are disabled or squelched by writing 0s to the corresponding

nibbles. The ports are enabled by writing all 1s, which is the

default setting. For example, to squelch Port A, Register 0xC3

must be set to 0x0F. The entire nibble must be written to all 0s

for this functionality.

Table 18. Squelch and Disable Control Registers

Name Address Data Default

OUT_A/

OUT_B

squelch

control

0xC3,

0xE3

SQUELCH[3:0] DISABLE[3:0]

0xFF

Table 19. Squelch and Disable Functionality

SQUELCH[3:0]

DISABLE[3:0]

Output State

1111 1111 Enabled (default)

xxxx

0000 Disabled

0000 1111 Squelched

xxxx = don’t care