參數(shù)資料
型號: OL2381AHN
廠商: NXP Semiconductors N.V.
元件分類: 微波射頻器件
英文描述: Highly Integrated Single Chip Sub 1-GHz RF Transceiver
封裝: OL2381AHN<SOT617-3 (HVQFN32)|<<http://www.nxp.com/packages/SOT617-3.html<1<Always Pb-free,;
文件頁數(shù): 29/43頁
文件大小: 2978K
代理商: OL2381AHN
AN11017
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Application note
Rev. 2 — 10 May 2011
29 of 43
NXP Semiconductors
AN11017
Transceiver OL2381 using wireless M-BUS
6.6 Expected modulation amplitude configuration
The expected peak modulation is configured to obtain the optimum receiver settings.
Register EMODAMPTH (see
Figure 34
) holds the expected peak deviation value
which is compared with the actual received baseband signal. Good results can be found if
calculated with an f
dev
of 70 %. If a higher bandwidth is required, set register EXPERT2
(see
Section 6.2
). The formula to calculate the expected modulation amplitude
configuration is then different.
(10)
(11)
Where:
f
dev
= desired modulation deviation
X = 33256 * f
dev
/ 600 kHz (for S,T and C)
X = 33256 * f
dev
/ 200 kHz (for R and F)
EDGE_MODAMPTH_TH_MANT = 1100b.
Table 30.
M-Bus radio
link
Fig 34. Expected modulation amplitude configuration
M-Bus edge slicer configuration register settings
OL2381 register address
EMODAMPTH (0x2A)
0x7C
0x68
Information
S, T, C
R, F
f
dev(min)
= 40 kHz, X = 2217, X
70 %
= 1552 ~ 12
×
2
7
f
dev(min)
= 4.8 kHz, X = 798, X
70 %
= 559 ~ 8
×
2
6
EDGE_MODAMP_TH_EXP
min 15
log
2
7.75
)
---------------------------
,
=
EDGE_MODAMP_TH_MANT
min 15
2
EDGE
_MODAMP_TH_EXP
----------------------------------------------------------
0.5
+
,
=
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