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RF96 Datasheet(PDF) 80 Page - HOPE Microelectronics CO., Ltd.

Part # RF96
Description  Low Power Long Range Transceiver
Download  121 Pages
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Manufacturer  HOPE [HOPE Microelectronics CO., Ltd.]
Direct Link  https://www.hoperf.com/
Logo HOPE - HOPE Microelectronics CO., Ltd.

RF96 Datasheet(HTML) 80 Page - HOPE Microelectronics CO., Ltd.

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Page 80
RF96/97/98
Tel: +86-755-82973805
Fax: +86-755-82973550
E-mail: sales@hoperf.com http://www.hoperf.com
WIRELESS & SENSING
PRELIMINARY
DATASHEET
5.4.4. Over Current Protection
The power amplifiers of RF96/97/98 are protected against current over supply in adverse RF load conditions by the over
current protection block. This has the added benefit of protecting battery chemistries with limited peak current capability
and minimising worst case PA consumption in battery life calculation. The current limiter value is controlled by the OcpTrim
bits in RegOcp, and is calculated according to the following formulae:
Table 81 Trimming of the OCP Current
OcpTrim
IMAX
Imax Formula
0 to 15
45 to 120 mA
45 + 5*OcpTrim [mA]
16 to 27
130 to 240 mA
-30 + 10*OcpTrim [mA]
27+
240 mA
240 mA
Note Imax sets a limit on the current drain of the Power Amplifier only, hence the maximum current drain of the
RF96/
77/78 is equal to Imax + IFS.
5.5. Receiver Description
5.5.1. Overview
The RF96/97/98 features a digital receiver with the analog to digital conversion process being performed directly
following the LNA-Mixers block. In addition to the LoRaTM modulation scheme the low-IF receiver is able to demodulate
ASK, OOK, (G)FSK and (G)MSK modulation. All filtering, demodulation, gain control, synchronization and packet handling
is performed digitally allowing a high degree of programmable flexibility. The receiver also has automatic gain calibration,
this improves the precision of RSSI measurement and enhances image rejection.
5.5.2. Receiver Enabled and Receiver Active States
In the receiver operating mode two states of functionality are defined. Upon initial transition to receiver operating mode the
receiver is in the
„receiver-enabled‟ state. In this state the receiver awaits for either the user defined valid preamble or RSSI
detection criterion to be fulfilled. Once met the receiver enters
„receiver-active‟ state. In this second state the received
signal is processed by the packet engine and top level sequencer. For a complete description of the digital functions of the
RF96/97/98 receiver please see Section 4 of the datasheet.
5.5.3. Automatic Gain Control In FSK/OOK Mode
The AGC feature allows receiver to handle a wide Rx input dynamic range from the sensitivity level up to maximum input
level of 0dBm or more, whilst optimizing the system linearity.
The following table shows typical NF and IIP3 performances for the RF96/97/98 LNA gains available.


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