ASCELL3911 データシートの表示（PDF） - austriamicrosystems AG
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ASCELL3911 Datasheet PDF : 13 Pages
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ISM 868 MHz, 433 MHz and 315 MHz FSK Transmitter – Preliminary Data Sheet
ASCell3911
Austria Mikro Systeme International AG
This document contains information on products under development. Austria Mikro Systeme International AG reserves the right to
change or discontinue this product without notice.
1 Functional Description
The ASCell3911 consists at the RF side of a reference XTAL oscillator, a single channel RF-
synthesizer, an I/Q based direct conversion FSK modulator, a driving amplifier. On the digital
side the pulse interference resistant protocol encoder and a µC interface, including microproc-
essor clock divider and a sophisticated power up/down circuitry are implemented.
RF+
VDD
f =868.3 MHz
RF-
PAGND
Driving Quadrature Baseband
Amplifier Up Converter Filters
Sin / Cos
Generator
90°
Synthesizer
Protocol
Encoder
Transmit.
Timing
Control
Register
µIeae+nrcCtfPwru/ondpwoe
VDDSTN
GNDSYN
VCO
Divider
64:1/32:1/16:1
Loop-
Filter
Phase
Detector
XTAL
Oscillator
Clock
ASCell3911
RESET/TEST
13.5672 MHz
XTAL
D_CLK
D_EN
DATA
WAKEUP
µC CLK
VDD
GND
Figure 1:
Block diagram of the ASCell3911.
1.1 RF Synthesizer
Frequency synthesis is performed by a single channel synthesizer, consisting of a phase de-
tector, a charge pump, a voltage-controlled oscillator (VCO), and a feedback divider. The VCO is
working at 315,000 to 868,300 MHz. The feedback divider divides by 16 (315,00 MHz), 32
(433,920 MHz) or 64 (868,300 MHz). The different ISM bands are selected by different XTAL fre-
quency values FXOSC and the CRYSTAL and RANGE control bits. A truth table for the selection
of the different frequencies is given in Table 1.
FXOSC / MHz Multiplier CRYSTAL RANGE
19,6875
16
H
L
13,5600
32
L
L
13,5672
64
L
H
not used
H
H
FC/ MHz
315,000
433,920
868,300
not used
Table 1:
Quartz and RF output frequencies.
Rev. A, February 2000
Page 3 of 13
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