Rainbow Electronics U3741BM - Manual (Page 26)

26
U3741BM
4662B–RKE–10/04
Maximum input level
Input matched according to Figure 4,
BER
≤
10 -3 ,
ASK mode
P
in_max -28
-20 dBm
dBm
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 4
ASK (level of carrier)
BER
≤
10 -3 , B = 300 kHz
f
in
= 433.92 MHz/315 MHz
T = 25°C, V
S
= 5 V
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 4
ASK (level of carrier)
BER
≤
10 -3 , B = 600 kHz
f
in
= 433.92 MHz/315 MHz
T = 25°C, V
S
= 5 V
f
IF
= 1 MHz
P
Ref_ASK
Electrical Characteristics (Continued)
All parameters refer to GND, T
amb
= -40°C to +105°C, V
S
= 4.5 V to 5.5 V, f
0
= 433.92 MHz and f
0
= 315 MHz, unless otherwise specified.
(V
S
= 5 V, T
amb
= 25°C)
Parameters Test Conditions Symbol Min. Typ. Max. Unit