RFM67W Datasheet, PDF (4/37 Pages) List of Unclassifed Manufacturers – ISM TRANSMITTER MODULE

ADVANCED COMMUNICATIONS & SENSING
RFM 67W
DATASHEET
This product datasheet contains a detailed description of the RFM67W performance and functionality.
1. General Description
The RFM67W is a transmitte module capable of (G)FSK, (G)MSK, and OOK modulation of an input data stream. It can
transmit this modulated signal in the 315, 433, 868 and 915 MHz licence free ISM bands.
1.1. Simplified Block Diagram
VR_PA
VBAT
VR_DIG
VR_ANA
Power Distribution
RFOUT
GND
PLL_LOCK
PA1
Ramp and
Control
PA2
Div 2/4/6
Fractional-N
PLL
÷R
XTAL
RESET
TEST
Interpolation
and Filtering
RC Oscillator
Modulator
Calibration
Switch I/P
Registers
and SPI
Interface
E2_MODE
DATA
DCLK
NSS
MISO
MOSI
SCK
CLKOUT
XTA
XTB
PB(3:0)
Figure 1. RFM67W Simplified Block Diagram
The general architecture of the RFM67W is shown in Figure 1. The frequency synthesizer generating the LO frequency is
a third-order fractional-N sigma-delta PLL. The PLL is capable of fast auto-calibration and offers fast switching and
settling times. For frequency modulation ((G)FSK and (G)MSK), the modulation is performed within the PLL bandwidth.
Optional pre-filtering of the bit stream may also be enabled to reduce the power delivered to adjacent channels.
Amplitude modulation (OOK), is performed via a DAC driving the reference of the regulator of the PA. Note that pre-filtering
of the bit stream is also available in this mode. The VCO works at 2, 4 or 6 times the RF output frequency to improve the
quadrature precision and reduce pulling effects during transmission.
The PA of the RFM67W is comprised of two amplifiers - one high power, one low power. This enables the RFM67W to
deliver a wide range, over 30 dB, of output powers - up to +13 dBm in single PA configuration. However, with an appropriate
output impedance transformation, in dual PA mode, this can be increased to +17 dBm.
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
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