AD4600ACPZ-R7 datasheet(21/28 Pages) AD

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ADN4600

Rev. 0 | Page 21 of 21

Selective Squelch and Disable

Each transmitter is equipped with disable and squelch controls.

Disable is a full power-down state: all transmitter current,

including output current, is reduced to 0 mA and the output

pins are pulled up to VTTO, but there is a delay of

approximately 1 μs associated with re-enabling the transmitter.

The output disable control is accessed through the TX EN bit

(Bit 5) of the TX[7:0] configuration registers through the I2C

control interface.

Squelch simply reduces the output current to submicroamp

levels, allowing both output pins to pull up to VTTO through

the output termination resistors. The transmitter recovers from

squelch in less than 100 ns.

The output squelch and the output disable control can both be

accessed through the TX[7:0] squelch control registers, with the

top nibble representing the squelch control and the bottom nibble

representing the output disable for one channel. The channels

are disabled or squelched by writing 0s to the corresponding

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

default setting. For example, to squelch channel TX0, Register

0xC3 must be set to 0x0F. The entire nibble must be written to

all 0s for this functionality.

Table 15. Transmitters Squelch Control Registers

Name

Addr

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

TX[7:0] Squelch Control

0xE3, 0xEB,

0xF3, 0xFB,

0xDB, 0xD3,

0xCB, 0xC3

SQUELCHb[3:0]

DISABLEb[3:0]

0xFF

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