UHF ASK/FSK Receiver ATA3745 - Atmel Corporation

8. Electrical Characteristics (Continued)
All parameters refer to GND, V S = 5V, 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 = 4.5V to 5.5V, T amb = –40°C to +85°C
Parameters Test Conditions Symbol Min. Typ. Max. Unit
Local Oscillator
Operating frequency range VCO f VCO 309 439 MHz
Loop bandwidth of the PLL
Capacitive load at pin LF
XTO operating frequency
Series resonance resistor of the
crystal
For best LO noise
(design parameter)
R1 = 820
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.
XTO crystal frequency,
appropriate load capacitance must be
connected to XTAL
6.764375 MHz
4.90625 MHz
f XTO = 6.764 MHz
4.906 MHz
B Loop 100 kHz
C LF_tot 10 nF
f XTO 6.764375
–50 ppm
4.90625
–50 ppm
6.764375
4.90625
6.764375
+50 ppm
4.90625
+50 ppm
R S
150
220
Static capacitance at pin XT0 C XT0 6.5 pF
Analog Signal Processing
Input sensitivity ASK 600-kHz IF filter
Sensitivity variation ASK for full
operating range including IF filter
compared to T amb =25C, V S = 5V
Input matched according to Figure 5-1
ASK (level of carrier)
BER 10 -3 , B = 600 kHz
f in = 433.92 MHz/315 MHz
T = 25C, V S = 5V
f IF = 1 MHz
P Ref_ASK
BR_Range0 –106 –110 –113.5 dBm
BR_Range1 –104.5 –108.5 –112 dBm
BR_Range2 –104 –108 –111.5 dBm
BR_Range3 –102 –106 –109.5 dBm
600-kHz version
f in = 433.92 MHz/315 MHz
f IF = 0.81 MHz to 1.19 MHz
f IF = 0.75 MHz to 1.25 MHz
P ASK = P Ref_ASK + P Ref
P Ref +3
+5
SNR to suppress in-band noise
signals
ASK mode SNR ASK 11 dB
Dynamic range RSSI ampl. R RSSI 60 dB
MHz
MHz
dB
dB
Lower cut-off frequency of the data
filter
1
f cu_DF
= ---------------------------------------------------------
2 30k CDEM
CDEM = 33 nF
f cu_DF 0.11 0.16 0.20 kHz
24
ATA3745
4901B–RKE–11/07