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VP306 Datasheet(PDF) 42 Page - Mitel Networks Corporation

Part # VP306
Description  Satellite Channel Decoder
PDF  85 Pages
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Manufacturer  MITEL [Mitel Networks Corporation]
Direct Link  http://www.mitel.com
Logo MITEL - Mitel Networks Corporation

VP306 Datasheet(HTML) 42 Page - Mitel Networks Corporation

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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.
42
2.8. BANK 3: Program QPSK registers.
2.8.1. CR_SWR: Carrier sweep rate register.
Parallel mode -
Bank 3. Address 1.
Type Read / Write.
Serial mode - Address 25.
76543210
CR_SWR[7:0] Carrier sweep rate
CR_SWR[7:0]
Carrier sweep rate.
CR_SWP = 64 * KDCR * θ
Where:
KDCR is the carrier phase detector gain, typically 10 for low Eb / No of 4 dB.
θ is the phase lock loop steady state error during acquisition. θ should be lower than
5° expressed in radians. During the tracking phase, the loop drives the residual
steady state error to 0.
Therefore, if KDCR = 10 and θ = 3° = 0.052rad.
CR_SWP = 64 * 10 * 0.052 = 33 (rounded down).
The frequency sweep rate is given by the following formula:
f =
5 * CR_SWP
128 *
π *CR_KP
*
KVCOCR
RCR * CCR
*
VDD
5V
Hz/s
For the SL1710
KVCOCR = 11.56Mrad/s/V.
For VDD = 3.3V
Therefore
f =
5 * 33 * 11.56 * 106 * 3.3
128 *
π * CR_KP * RCR * CCR * 5
=
3.13 * 106
CR_KP * RCR * CCR



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