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): 25/43頁
文件大?。?/td> 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
25 of 43
NXP Semiconductors
AN11017
Transceiver OL2381 using wireless M-BUS
6.1 LNA configuration
The gain of the LNA can be programmed in 16 steps. In WUPS mode, the receiver
automatically detects the signal strength and decides to use either the HI_GAIN, or the
LOW_GAIN setting. This is important to achieve a large dynamic range.
In this example, HI_GAIN is set to maximum gain and LOW_GAIN is set to minimum gain.
This is shown in
Figure 28
(default value).
Table 23.
M-Bus radio link
If the RSSI exceeds the value given in register HIGAINLIM during wake-up search (see
Figure 29
), the receiver switches to LOW_GAIN. The GAINSTEP register is set to 0.
Table 24.
M-Bus radio link OL2381 register address
GAINSTEP (0x23) HIGAINLIM (0x24)
S, T, C, R, F
0x00
Fig 28. LNA configuration
M-Bus LNA configuration register settings
OL2381 register address
RXGAIN (0x21)
S, T, C, R, F
0xF0
Information
HI_GAIN = maximum, LOW_GAIN = minimum
Fig 29. Automatic gain
M-Bus automatic gain register settings
Information
0x78
at this input power the LNA switches
to LO_GAIN
019aab780
019aab781
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