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AS1160/AS1161

Datasheet - A p p l i c a t i o n I n f o r m a t i o n

11 Application Information

Power Considerations

An all CMOS design of the serializer and deserializer makes them inherently low power devices. In addition, the con-

CMOS designs.

The pins AVDD and DVDD should be bypassed with a 100nF and a 1nF ceramic capacitor in parallel. The 1nF capac-

itor should be closest to the pin.

Powering up the Deserializer

The AS1161 can be powered up at any time by following a proper sequence. The REFCLK input can be running before

the deserializer powers up and it must be running in order for the deserializer to lock to incoming data. The deserializer

outputs will remain in tri-state until the deserializer detects data transmission at its inputs and locks to the incoming

data stream.

Transmitting Data

Once the serializer (AS1160) and deserializer (AS1161) are powered up, they must be phase locked to each other to

transmit data. Phase locking occurs when the deserializer locks to incoming data or when the serializer sends patterns.

The serializer sends SYNCPATs whenever the SYNC1 or SYNC2 inputs are high. The LOCKN output of the deserial-

izer remains high until it has locked to the incoming data stream. Connecting the LOCKN output of the deserializer to

one of the SYNC inputs of the serializer will guarantee that enough SYNCPATs are sent to achieve deserializer lock

(see Figure 36 on page 23).

except for the specific case of loss of lock during transmission (see Lock Loss Recovery on page 23).

Table 11. Deserializer Truth Table

Inputs

Outputs

PWDNN

REN

LOCKN

RCLK

High

High

High (not locked)

Z

Z

High

High

Low (not locked)

Active

1

1. Active indicates the RCLK will be running if the deserializer is locked. The timing of RCLK with respect to

ROUT0:ROUT9 is determined by RCKR/FN. ROUT0:ROUT9 and RCLK are tri-stated when LOCKN is asserted

high.

Active

1

Low

X (dont care)

Z

Z

Z

High

Low

Active

2

2. Active indicates the LOCKN output will reflect the state of the deserializer with regard to the selected data

stream.

ZZ