U3742BM Datasheet, PDF (28/32 Pages) ATMEL Corporation – UHF ASK/FSK RECEIVER

Electrical Characteristics (Continued)
All parameters refer to GND, T_amb = -40°C to +105°C, V_S = 4.5 V to 5.5 V, f₀ = 433.92 MHz and f₀ = 315 MHz, unless other-
wise specified. (V_S = 5 V, T_amb = 25°C)
Parameters
Test Conditions
Symbol
Min.
Typ.
Max. Unit
Loop bandwidth of the PLL
Capacitive load at pin LF
For best LO noise
(design parameter)
R₁ = 820 W
C₉ = 4.7 nF
C₁₀ = 1 nF
The capacitive load at pin LF is limited
if bit check is used. The limitation
therefore also applies to self-polling.
B_Loop
C_{LF_tot}
100
kHz
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 6.764375 6.764375 MHz
-30 ppm
+30 ppm
4.90625 4.90625 4.90625 MHz
-30 ppm
+30 ppm
Series resonance resistor of the
crystal
f_XTO = 6.764 MHz
4.906 MHz
R_S
150
W
220
W
Static capacitance of the crystal
Analog Signal Processing
C_xto
6.5
pF
Input sensitivity ASK
Input matched according to Figure 6
ASK (level of carrier)
BER £ 10^-3, f_IF = 1 MHz
f_in = 433.92 MHz/315 MHz
T = 25°C, V_S = 5 V
BR_Range0
P_{Ref_ASK}
-108
-110
-112
dBm
Input sensitivity ASK
BR_Range1
BR_Range2
-106.5
-106
-108.5
-108
-110.5
-110
dBm
dBm
BR_Range3
-104
-106
-108
dBm
Sensitivity variation ASK for the full
operating range compared to
T_amb = 25°C, V_S = 5 V
Sensitivity variation ASK for full
operating range including IF filter
compared to T_amb = 25°C, V_S = 5 V
Input sensitivity FSK
Input sensitivity FSK
f_in = 433.92 MHz/315 MHz
f_IF = 1 MHz
P_ASK = P_{Ref_ASK} + DP_Ref
f_in = 433.92 MHz/315 MHz
f_IF = 0.79 MHz to 1.21 MHz
f_IF = 0.73 MHz to 1.27 MHz
P_ASK = P_{Ref_ASK} + DP_Ref
Input matched according to Figure 6,
BER £ 10^-3, f_IF = 1 MHz
f_in = 433.92 MHz/315 MHz
T = 25°C, V_S = 5 V
BR_Range0
df ³ ±20 kHz
df ³ ±30 kHz
BR_Range1
df ³ ±20 kHz
df ³ ±30 kHz
DP_Ref
DP_Ref
P_{Ref_FSK}
+2.5
+5.5
+7.5
-95.5
-96.5
-94.5
-95.5
-1.5
dB
-1.5
dB
-1.5
dB
-97.5
-98.5
-99.5
-100.5
dBm
dBm
-96.5
-97.5
-98.5
-99.5
dBm
dBm
28 U3742BM
4735A–RKE–11/03