VP306 datasheet(30/85 Pages) MITEL

30 / 85 page

VP305/6

DRAFT - PRELIMINARY DATA

The duplication or disclosure of data contained on this sheet is subject to the restrictions

on the title page of this document.

2.5.5. AGC_LVL: AGC loop voltage meter register.

Parallel mode -

Bank 0. Address 4.

Type Read.

Serial mode - Address 04.

6543210

AGC_LVL[7:0] AGC loop voltage meter

AGC_LVL[7:0]

AGC loop voltage meter. The register is NOT reset to zero when it is read.

The relationship between the loop voltage Vagc and the AGC_LVL register is:

Vagc = AGC_LVL * Vref / 256

The AGC_OUT pin has an open drain buffer allowing an external Vref of up to

5 volts to be used.

2.5.6. CR_VCOF U & L: Measured VCO frequency registers.

Parallel mode -

Bank 0. Addresses 5, 6.

Type Read.

Serial mode - Addresses 05, 06.

7654321

Reserved

CR_VCOF[13:8] Measured VCO frequency (upper nibble)

CR_VCOF[7:0] Measured VCO frequency (lower byte)

These two bytes together form the 14 bit number: CR_VCOF[13:0] Measured carrier VCO

frequency. The register is NOT reset to zero when it is read.

The actual carrier frequency is found from the following formula:

Fvco =

32 * Fcrystal

CR_RP * 1024

* CR_VCOF

The incremental carrier step frequency is found by putting the value of CR_VCOF = 1 in the

equation:

δFvco =

32 * Fcrystal

CR_RP * 1024

* 1

See page 12 for further discussion.

VP306 Datasheet(PDF) 30 Page - Mitel Networks Corporation