AS3977-BQFT austriamicrosystems, AS3977-BQFT Datasheet - Page 19

• Manufacturer Part Number: AS3977-BQFT
• Description: IC RF TRANSMITTER FSK 16-QFN
• Manufacturer: austriamicrosystems

Specifications of AS3977-BQFT

• Frequency: 300MHz ~ 928MHz
• Applications: ISM
• Modulation Or Protocol: FSK
• Data Rate - Maximum: 100 kbps
• Power - Output: 10dBm
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-VQFN Exposed Pad, 16-HVQFN, 16-SQFN, 16-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Current - Transmitting: -

AS3977
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
Figure 5. Functional Description Diagram of Timers and Data Synchronization
The Prescaler divides the XTAL frequency by f
The Compare timer divides by f
which leads into a data frequency of:
f
Operation Modes
All modes are controlled by the SDI interface.
www.austriamicrosystems.com
OUT
ENABLE
TXDATA
MCCLK
XTAL
Power Down Mode
The AS3977 is connected to the power supply and can be switched to power down mode. The current
consumption is limited by the leakage current.
Clock Enable Mode
In this mode, only the reference frequency generator is switched on and a clock signal is supplied via the clock
output.
PLL Enable Mode
The PLL is switched on and locked at the selected output frequency. The power amplifier is in power down mode.
This mode enables OOK-ASK modulation by switching the PA on and off.
Transmit Mode
The PLL is switched on and locked at the selected output frequency. The power amplifier is in power on mode.
This is the FSK mode for transmitting data.
=2
-(PSC<2:0>+ASC<1:0>+1)
PSC
to
3
1
/ 1,2,4,8,…
Prescalar
3
Set Powerdown
/ 2^16
128
2
reset
INV
CLK Source
* f
IN
compare
OUT
1
value
timer
/ (TCV+1)
=f
compare
IN
counter
reset
/(TCV+1) and the Postscaler divides the input frequency by f
8bit
8
Powerdown Timer
Powerdown
OUT
Generator
Baudrate
=2
-PSC<2:0>
Revision 3.5
*f
IN
ASC
Postscalar
/ 1,2,4,8
2
Data Generator
xor
Synchronization
Data
OUT
to
3
1
MC
=2
-ASC<1:0>
TXDO
19 - 45
*f
IN