AD9549 datasheet(74/78 Pages) AD

74 / 78 page

AD9549

Preliminary Technical Data

Rev. PrA | Page 74 of 78

0308; S1 Pin Configuration (See “Status and Warnings” on Page 48.)

Note: The choice of input for a given pin must be all Ref A or all Ref B, and not a combination thereof.

[0] IRQ: Select “IRQ” signal for output on this pin

[1] Reserved

[2] Frequency Lock: Select “Frequency Lock” signal for output on this pin

[3] Phase Lock: Select “Phase Lock” signal for output on this pin

[4] Ref? Not Valid: Select either RefA (0) or RefB (1) “Not Valid” signal for output on this pin

[5] Ref? OOL: Select either RefA (0) or RefB (1) “OOL” signal for output on this pin

[6] Ref?: LOR: Select either RefA (0) or RefB (1) “LOR” signal for output on this pin

[7] Ref?: Choose either RefA (0) or RefB (1) for use with bits 4 – 6

0309; S2 Pin Configuration: Same as register 0308, except applies to pin S2

030A; S3 Pin Configuration: Same as register 0308, except applies to pin S3

030B; S4 Pin Configuration: Same as register 0308, except applies to pin S4

030C; Control

[0] Enable Frequency Lock Detector. Register 0319 must be set up to use this. See “Frequency Lock Detection” on Page 32.

[1] Enable Phase Lock Detector: Register 0314h-0318h must be set up to use this. See “Phase Lock Detection” on Page 31.

[3:2] Unused

[4] Enable RefB OOL: The RefB OOL limits are set up in Registers 032C to 0335.

[5] Enable RefB LOR: The RefA LOR limits are set up in Registers 0320 to 0321.

[6] Enable RefA OOL: The RefB OOL limits are set up in Registers 0322 to 032B.

[7] Enable RefA LOR: The RefB LOR limits are set up in Registers 031E to 031F.

030D; Unused

030E – 0313; HFTW; Read-Only

[47:0] Average or Instantaneous FTW: This read-only register is the output of FTW monitor. Average or Instantaneous is

determined by “Holdover Mode” (see Bit 4, Register 01C0). These registers must be manually refreshed by issuing an

IO_UPDATE.

0314 – 0317; Phase Lock

[31:0] Phase Lock Threshold: See “Phase Lock Detection” on Page 31.

0318; Phase Lock (continued)

[7:5] Phase Unlock Watchdog Timer : See “Phase Lock Detection” on Page 31.

[4:0] Phase Lock Watchdog Timer : See “Phase Lock Detection” on Page 31.

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