Atmel ATA3741 Series, Operating

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26
4899B–RKE–10/06
ATA3741
Local Oscillator
Operating frequency range VCO f
VCO
299 449 MHz
Phase noise VCO/LO
f
osc
= 432.92 MHz
At 1 MHz
At 10 MHz L (fm) –93
–113
–90
–110
dBC/Hz
dBC/Hz
Spurious of the VCO At ±f
XTO
–55 –47 dBC
VCO gain K
VCO
190 MHz/V
Loop bandwidth of the PLL
For best LO noise
(design parameter)
R1 = 820
Ω
C9 = 4.7 nF
C10 = 1 nF
B
Loop
100 kHz
Capacitive load at pin LF
The capacitive load at pin LF is
limited if bit check is used. The
limitation therefore also applies to
self polling.
C
LF_tot
10 nF
XTO operating frequency
XTO crystal frequency,
appropriate load capacitance must
be connected to XTAL
6.764375 MHz
4.90625 MHz
f
XTO
6.764375
–30 ppm
4.90625
–30 ppm
6.764375
4.90625
6.764375
+30 ppm
4.90625
+30 ppm
MHz
MHz
Series resonance resistor of the
crystal f
XTO
= 6.764 MHz
4.906 MHz
R
S
150
220
Ω
Ω
Static capacitance of the crystal C
xto
6.5 pF
Analog Signal Processing
Input sensitivity ASK 300-kHz IF filter
Input matched according to Figure
3-3
ASK (level of carrier)
BER
≤
10
–3
, B = 300 kHz
f
in
= 433.92 MHz/315 MHz
T = 25°C, V
S
= 5V
f
IF
= 1 MHz
P
Ref_ASK
Input sensitivity ASK 300-kHz IF filter BR_Range0 –109 –111 –113 dBm
Input sensitivity ASK 300-kHz IF filter BR_Range1 –107 –109 –111 dBm
Input sensitivity ASK 300-kHz IF filter BR_Range2 –106 –108 –110 dBm
Input sensitivity ASK 300-kHz IF filter BR_Range3 –104 –106 –108 dBm
Input sensitivity ASK 600-kHz IF filter
Input matched according to Figure
3-3
ASK (level of carrier)
BER
≤
10
–3
, B = 600 kHz
f
in
= 433.92 MHz/315 MHz
T = 25°C, V
S
= 5V
f
IF
= 1 MHz
P
Ref_ASK
9. Electrical Characteristics (Continued)
All parameters refer to GND, T
amb
= –40°C to +105°C, V
S
= 4.5V to 5.5V, f
0
= 433.92 MHz and f
0
= 315 MHz, unless otherwise specified.
(V
S
= 5V, T
amb
= 25°C)
Parameters Test Conditions Symbol Min. Typ. Max. Unit