Rainbow Electronics U3745BM - Manual (Page 23)

23
U3745BM
4663A–RKE–06/03
Absolute Maximum Ratings
Parameters Symbol Min. Max. Unit
Supply voltage V
S
6 V
Power dissipation P
tot
450 mW
Junction temperature T
j
150 ° C
Storage temperature T
stg
-55 +125 ° C
Ambient temperature T
amb
-40 +85 ° C
Maximum input level, input matched to 50 W P
in_max
10 dBm
Thermal Resistance
Parameters Symbol Value Unit
Junction ambient R
thJA
100 K/W
Electrical Characteristics
All parameters refer to GND, V
S
= 5 V, T
amb
= 25
°
C, f
0
= 433.92 MHz and f
0
= 315 MHz, unless otherwise specified. The
possible operating range refer to different circuit conditions: V
S
= 4.5 V to 5.5 V, T
amb
= -40 ° C to +85 ° C
Parameters Test Conditions Symbol Min. Typ. Max. Unit
Current consumption
Sleep mode
(XTO and polling logic active)
IS
off
190 350 µA
IC active
(startup-, bit check-, receiving mode)
Pin DATA = H
IS
on
7.0 8.6 mA
LNA Mixer
Third-order intercept point
LNA/mixer/IF amplifier
input matched according to Figure 4
IIP3 -28 dBm
LO spurious emission at RF
In
Input matched according to Figure 4,
required according to I-ETS 300220
IS
LORF
-73 -57 dBm
Noise figure LNA and mixer (DSB) Input matching according to Figure 4 NF 7 dB
LNA_IN input impedance
at 433.92 MHz
at 315 MHz
Zi
LNA_IN
1.0 || 1.56
1.3 || 1.0
k W || pF
k W || pF
1 dB compression point (LNA, mixer,
IF amplifier) Input matched according to Figure 4,
referred to RF
in
IP
1db
-40 dBm
Maximum input level
Input matched according to Figure 4,
BER
£ 10 -3 ,
ASK mode
P
in_max
-23 dBm
Local Oscillator
Operating frequency range VCO f
VCO
309 439 MHz
Loop bandwidth of the PLL
For best LO noise
(design parameter)
R1 = 820
W
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