IA4420 Datasheet, PDF (2/29 Pages) List of Unclassifed Manufacturers – Universal ISM Band FSK Transceiver

IA4420
DETAILED FEATURE-LEVEL DESCRIPTION
The IA4420 FSK transceiver is designed to cover the unlicensed
frequency bands at 315, 433, 868 and 915 MHz. The devices
facilitate compliance with FCC and ETSI requirements.
The receiver block employs the Zero-IF approach with I/Q
demodulation, allowing the use of a minimal number of external
components in a typical application. The IA4420 incorporates a
fully integrated multi-band PLL synthesizer, PA with antenna tuning,
an LNA with switchable gain, I/Q down converter mixers, baseband
filters and amplifiers, and an I/Q demodulator followed by a data
filter.
PLL
The programmable PLL synthesizer determines the operating
frequency, while preserving accuracy based on the on-chip crystal-
controlled reference oscillator. The PLL’s high resolution allows the
usage of multiple channels in any of the bands.
The RF VCO in the PLL performs automatic calibration, which requires
only a few microseconds. Calibration always occurs when the
synthesizer starts. If temperature or supply voltage changes
significantly, VCO recalibration can be invoked easily. Recalibration
can be initiated at any time by switching the synthesizer off and
back on again.
RF Power Amplifier (PA)
The power amplifier has an open-collector differential output and
can directly drive a loop antenna with a programmable output power
level. An automatic antenna tuning circuit is built in to avoid costly
trimming procedures and the so-called “hand effect.”
LNA
The LNA has 250 Ohm input impedance, which functions well with
the proposed antennas (see: Application Notes available from
http://www.integration.com)
If the RF input of the chip is connected to 50 Ohm devices, an
external matching circuit is required to provide the correct matching
and to minimize the noise figure of the receiver.
The LNA gain can be selected (0, –6, –14, –20 dB relative to the
highest gain) according to RF signal strength. It can be useful in an
environment with strong interferers.
Baseband Filters
The receiver bandwidth is selectable by programming the bandwidth
(BW) of the baseband filters. This allows setting up the receiver
according to the characteristics of the signal to be received.
An appropriate bandwidth can be chosen to accommodate various
FSK deviation, data rate and crystal tolerance requirements. The
filter structure is 7th order Butterworth low-pass with 40 dB
suppression at 2*BW frequency. Offset cancellation is done by
using a high-pass filter with a cut-off frequency below 7 kHz.
Data Filtering and Clock Recovery
Output data filtering can be completed by an external capacitor or by
using digital filtering according to the final application.
Analog operation: The filter is an RC type low-pass filter followed
by a Schmitt-trigger (St). The resistor (10 kOhm) and the St are
integrated on the chip. An (external) capacitor can be chosen according
to the actual bit rate. In this mode, the receiver can handle up to 256
kbps data rate. The FIFO can not be used in this mode and clock is
not provided for the demodulated data.
Digital operation: A digital filter is used with a clock frequency at
29 times the bit rate. In this mode there is a clock recovery circuit
(CR), which can provide synchronized clock to the data. Using this
clock the received data can fill a FIFO. The CR has three operation
modes: fast, slow, and automatic. In slow mode, its noise immunity
is very high, but it has slower settling time and requires more accurate
data timing than in fast mode. In automatic mode the CR automatically
changes between fast and slow mode. The CR starts in fast mode,
then after locking it automatically switches to slow mode
(Only the digital data filter and the clock recovery use the bit rate
clock. For analog operation, there is no need for setting the correct
bit rate.)
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