AS3977 Datasheet, PDF (1/2 Pages) ams AG – Multi-Channel Narrowband FSK Transmitter

Product Brief AS3977
PRELIMINARY INFORMATION: SUBJECT TO CHANGE WITHOUT ANY NOTICE
Multi-Channel Narrowband FSK Transmitter
AS3977
PRODUCT BRIEF
1. General Description
The AS3977 is a low-power fully integrated ETSI, FCC
and ARIB compliant FSK transmitter capable of operating
at any ISM frequency in the range of 300 to 928 MHz. It is
based on a sigma-delta controlled fractional-N synthesiser
phase locked loop with fully integrated voltage controlled
oscillator. The power amplifier output is programmable
and can deliver output power ranging from –20dBm up to
+10dBm. An on-chip low drop-out regulator is available in
case an accurate output power independent of voltage
supply variation is required.
The output signal can be shaped using a programmable
Gaussian filter to minimise the occupied bandwidth and
adjacent channel power. The maximum data rate can be
up to 100 kb/s – depending on the required filtering.
The FSK frequency deviation is programmable up to a
maximum of 64kHz.
The crystal oscillator can handle a wide range of
frequencies. For narrow-band applications a temperature
sensor with digital read-out is included that allows
compensation of the crystal frequency drift due to
temperature variation.
The AS3977 is connected to an external microcontroller
via a bi-directional digital interface. The device operates
at very low current consumption with a power supply
range from 2.0V to 3.6V and can be powered down when
not in use.
The device is fabricated in austriamicroystems advanced
0.35um SiGe-BiCMOS technology.
2. Key Features
- Compliant to ETSI EN 300-220, FCC CFR 47 part 15
and ARIB STD-T67
- Multi-channel with narrow bandwidth
- 300 – 928 MHz operating frequency range (ISM)
- Filtered FSK
- Data rate up to 100 kb/s
- FSK deviation programmable up to 64kHz
- Extremely low power consumption
3. Main Characteristics
- 2.0 – 3.6V power supply
- Power down current consumption 100 nA (3V, 25^oC)
- Output power up to +10dBm
- Occupied bandwidth 8.5 kHz (4.8 kb/s, FFSK, ARIB)
- Operating temperature range -40^oC to +85^oC
4. Additional Features
- Sigma-Delta controlled fractional-N synthesiser
- Resolution of synthesiser <100Hz
- Fully integrated PLL
- Fully integrated voltage controlled oscillator
- 4kV ESD protection (1.5kV for analogue pins)
- Automatic antenna tuning
- 12 – 20 MHz crystal oscillator
- On-chip temperature sensor with digital readout for AFC
purposes
- Integrated Manchester coder
- Digital lock detector
- Low drop-out regulator
- Bi-directional serial interface
5. Applications
- Remote keyless entry systems
- Short range radio data transmission
- Domestic and consumer remote control units
- Cordless alarm systems
- Remote metering
- Low power telemetry
Revision No. 1.3, Date: 02-2007
Page 1 of 2
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austriamicrosystems asserts that the information contained in this publication is accurate and correct.