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RFM 67W

ADVANCED COMMUNICATIONS & SENSING

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

VBAT

VR_DIG

VR_ANA

RESET

TEST

VR_PA

Power Distribution

E2_MODE

RFOUT

PA1

Div 2/4/6

RC Oscillator

GND

Ramp and

Control

Interpolation

and Filtering

Modulator

DATA

DCLK

PLL_LOCK

PA2

Fractional-N

PLL

Calibration

NSS

÷R

XTAL

Switch I/P

Registers

and SPI

Interface

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