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AS3977B-BQFM: 产品描述RF transmitter mutli-Ch fsk trans 300 to 928mhz; 产品类别热门应用无线/射频/通信; 文件大小863KB，共47页; 制造商AMS; 官网地址https://ams.com/zh; 标准

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AS3977B-BQFM概述

RF transmitter mutli-Ch fsk trans 300 to 928mhz

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Data Sheet

AS3977

M u l t i - C h a n n e l N a r r o w b a n d F S K Tr a n s m i t t e r

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 synthesizer phase locked loop (PLL)

with fully integrated voltage controlled oscillator (VCO). The power

amplifier (PA) output is programmable and can deliver power ranging

from –20dBm up to +10dBm. An on-chip low drop-out (LDO)

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 minimize 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

64 kHz.

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 0.35µm

SiGe-BiCMOS technology.

Main Characteristics

2.0 – 3.6V power supply

Power down current consumption 100 nA (3V, 25ºC)

Output power up to +10dBm

Occupied bandwidth 6 kHz (4.8 kb/s, FFSK, ARIB)

-40 to 85ºC temperature range

Additional Features

Sigma-Delta controlled fractional-N synthesizer

Resolution of synthesizer < 100Hz

Fully integrated PLL

Fully integrated voltage controlled oscillator (VCO)

4kV ESD protection (1.5kV for the Analog pins)

12 – 20 MHz crystal oscillator

On-chip temperature sensor with digital readout for AFC pur-

poses

Fast frequency hopping with predefined channel selection

Microcontroller clock output to save addition crystal

Constant output power over battery life time

Integrated Manchester coder

Digital lock detector

Low drop-out regulator

Bi-directional serial interface

Low Power Down Mode current consumption

2 Key Features

Fully integrated UHF transmitter

Compliant to ETSI EN 300-220, FCC CFR47 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 Applications

The AS3977 is suitable for Remote keyless entry systems, Short

range radio data transmission, Domestic and consumer remote

control units, Cordless alarm systems, Remote metering, and Low

power telemetry.

www.austriamicrosystems.com/AS3977

Revision 3.6

1 - 47

AS3977

Data Sheet - C o n t e n t s

Contents

1 General Description ..................................................................................................................................................................

2 Key Features.............................................................................................................................................................................

3 Applications...............................................................................................................................................................................

4 Pin Assignments .......................................................................................................................................................................

4.1 Pin Descriptions....................................................................................................................................................................................

5 Absolute Maximum Ratings ......................................................................................................................................................

6 Electrical Characteristics...........................................................................................................................................................

7 Timing Characteristics ............................................................................................................................................................

7.1 Timing Parameters .............................................................................................................................................................................

8 Detailed System Description...................................................................................................................................................

8.1 Reference Frequency Generator........................................................................................................................................................

8.2 Phase Locked Loop............................................................................................................................................................................

8.3 Gaussian Filter and Digital Modulator ................................................................................................................................................

8.4 Power Amplifier ..................................................................................................................................................................................

8.5 Temperature Sensor ...........................................................................................................................................................................

8.6 Low Power Reset ...............................................................................................................................................................................

8.7 Low Drop Out Regulators ...................................................................................................................................................................

8.8 SDI / Control Interface ........................................................................................................................................................................

8.9 Baud Rate Generator .........................................................................................................................................................................

9 Application Information ...........................................................................................................................................................

9.1 Operation Modes ................................................................................................................................................................................

9.2 Transmitter Control Interface..............................................................................................................................................................

9.2.1

9.2.2

9.2.3

9.2.4

9.2.5

9.3.1

9.3.2

9.3.3

9.3.4

Configuration Diagram...............................................................................................................................................................

Power On Reset ........................................................................................................................................................................

Writing of Data to Addressable Registers..................................................................................................................................

Reading of Data from Addressable Registers ...........................................................................................................................

Transmitting Data ......................................................................................................................................................................

Power Down State .....................................................................................................................................................................

Active Edge of CLK....................................................................................................................................................................

Active State................................................................................................................................................................................

Transmit State ...........................................................................................................................................................................

9.3 Transmitter Control States..................................................................................................................................................................

9.4 ENABLE Signal Functionality .............................................................................................................................................................

9.5 Communication and Command Byte Structure ..................................................................................................................................

9.6 Transmitter Configuration Register.....................................................................................................................................................

9.7 Special Bits.........................................................................................................................................................................................

9.7.1

9.7.2

9.7.3

9.7.4

LT (Lock Transmit).....................................................................................................................................................................

LS (Low Power Supply Voltage) ................................................................................................................................................

MCCS, CLKS and PSC .............................................................................................................................................................

SETPD (Set Power Down).........................................................................................................................................................

9.8 Output Frequency Setting...................................................................................................................................................................

9.8.1 Implementation .......................................................................................................................................................................... 35

9.8.2 Optional Frequency Calculation with Overlapping Fractional Bands by Using the Bit INT<8>.................................................. 36

9.8.3 FSK Deviation Setting and Frequency Trimming....................................................................................................................... 37

9.9 Baud Rate Generator .........................................................................................................................................................................

www.austriamicrosystems.com/AS3977

Revision 3.6

3 - 47

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AS3977B-BQFM

AS3977B-BQFM在线购买

AS3977B-BQFM概述

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