TH71221 Datasheet, PDF (29/44 Pages) Melexis Microelectronic Systems – 27 to 930MHz FSK/FM/ASK Transceiver

TH71221
27 to 930MHz
FSK/FM/ASK Transceiver
6.4 PLL Synthesizer Timings
Parameter
Channel
switching time
wide band
narrow band
TX – RX switching time
Symbol
Condition
t_{SW_WB}
t_{SW_NB}
t_{TX_RX}
B_PLL = 20kHz,
I_CP = 260µA
B_PLL = 2kHz,
I_CP = 260µA
IF = 10.7MHz
Min Typ Max Unit
200
µs
500
µs
1
ms
6.5 AC Characteristics of the Receiver Part
all parameters under normal operating conditions, unless otherwise stated; all parameters based on test
circuits for FSK (Fig. 14 to 15) and ASK (Fig. 16 to 17), respectively;
Parameter
Symbol
Condition
Min
Input sensitivity
ASK
Input sensitivity
FSK
f_RF= 433.92MHz
P_{minL_ASK}
f_RF= 868.3MHz
f_RF= 433.92MHz
P_{minH_ASK}
f_RF= 868.3MHz
f_RF= 433.92MHz
P_{minL_FSK}
f_RF= 868.3MHz
f_RF= 433.92MHz
P_{minH_FSK}
f_RF= 868.3MHz
B_IF = 150kHz, f_m = 2kHz
BER ≤ 3⋅10^-3
LNA @ low gain
B_IF = 150kHz, f_m = 2kHz
BER ≤ 3⋅10^-3
LNA @ high gain
B_IF = 150kHz, f_m = 2kHz
Δf = ± 50 kHz
BER ≤ 3⋅10^-3
LNA @ low gain
B_IF = 150kHz, f_m = 2kHz
Δf = ± 50 kHz
BER ≤ 3⋅10^-3
LNA @ high gain
Typ
-96
-96
-107
-107
-87
-87
-105
-105
Max Unit
dBm
dBm
dBm
dBm
Maximum input
signal
ASK
f_RF= 433.92MHz
P_{maxL_ASK}
f_RF= 868.3MHz
f_RF= 433.92MHz
P_{maxH_ASK}
f_RF= 868.3MHz
LNA @ low gain
LNA @ high gain
-10
dBm
-10
-20
dBm
-20
Maximum input
signal
FSK
f_RF= 433.92MHz
P_{maxL_FSK}
f_RF= 868.3MHz
f_RF= 433.92MHz
P_{maxH_FSK}
f_RF= 868.3MHz
Start-up time - ASK
t_{on_ASK}
Start-up time - FSK
t_{on_FSK}
Spurious emission
P_{spur_RX}
LNA @ low gain
LNA @ high gain
from standby to receive
mode
from standby to receive
mode
referred to receiver
input
-10
dBm
-10
-20
dBm
-20
1
1.5
ms
1
1.5
ms
-54
dBm
39010 071221
Rev. 005
Page 29 of 44
Data Sheet
June/07