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PRELIMINARY TECHNICAL DATA

AD9953

CFR1<25>: Shaped On-Off Keying enable bit.

When CFR1<25> = 0 (default,) Shaped On-Off Keying is bypassed.

When CFR1<25> = 1, Shaped On-Off Keying is enabled. When enabled,

CFR1<24> controls the mode of operation for this function.

CFR1<24>: AUTO Shaped On-Off Keying enable bit (only valid when CFR1<25> is

active high).

When CFR1<24> = 0 (default). When CFR1<25> is active, a logic 0 on CFR1<24>

enables the MANUAL Shaped On-Off Keying operation. See the Shaped On-Off

Keying section of this document for details.

When CFR1<24> = 1, if CFR1<25> is active, a logic 1 on CFR1<24> enables the

AUTO Shaped On-Off Keying operation. See the Shaped On-Off Keying section of

this document for details.

CFR1<23>: Automatic Synchronization Enable Bit.

When CFR1<23> = 0 (default), the automatic synchronization feature is inactive.

When CFR1<23> = 1, the automatic synchronization feature is active. See the

Synchronizing Multiple AD9953s section of this document for details.

CFR1<22>: Software Manual Synchronization bit.

When CFR1<22> = 0 (default), the manual synchronization of multiple AD9953s

feature is inactive.

When CFR1<22> = 1, the software controlled manual synchronization of multiple

AD9954s feature is executed. The SYNC_CLK rising edge is advanced by one

SYSCLK cycle and this bit is cleared. To advance the rising edge multiple times, this

bit needs to be set for each advance. See the Synchronizing Multiple AD9953s

section of this document for details.

REV. PrB 1/30/03

Page 17

Analog Devices, Inc.

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