Receiver Turn-On Timing
The maximum time t
PR
required for the receive function to become opera-
tional at turn-on is influenced by two factors. All receiver circuitry will be op-
erational 1 ms after the supply voltage reaches 2.2 Vdc. The BBOUT-
CMPIN coupling-capacitor is then DC stabilized in 4 time constants
(4*t
BBC
). The total turn-on time to stable receiver operation for a 10 ms
power supply rise time is:
t
PR
= 15 ms + 4*t
BBC
Receiver Wake-Up Timing
The maximum transition time t
SR
from the sleep mode to the receive mode
is 4*t
BBC
, where t
BBC
is the BBOUT-CMPIN coupling-capacitor time con-
stant. When the operating temperature is limited to 60°C, the time
required to switch from sleep to receive is dramatically less for short sleep
times, as less charge leaks away from the BBOUT-CMPIN coupling
capacitor.
AGC Timing
The maximum AGC engage time t
AGC
is 5 µs after the reception
of a -30 dBm RF signal with a 1 µs envelope rise time.
Peak Detector Timing
The Peak Detector attack time constant is set by the value of the capacitor
at the PKDET pin. The attack time t
PKA
=C
PKD
/4167, where t
PKA
is in µs
and C
PKD
is in pF. The Peak Detector decay time constant
t
PKD
= 1000*t
PKA
.
Data Rate (b/s)
1200
2400
4800
9600
19200
38400
57600
115200
230400
CFG1 Bits 3-0
0000
0001
0010
0011
0100
0101
0110
0111
1000
RF Monolithics, Inc.
Phone: (972) 233-2903
Fax: (972) 387-8148
RFM Europe
Phone: 44 1963 251383
Fax: 44 1963 251510
©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.
E-mail: info@rfm.com
http://www.rfm.com
TR8000-08172007
Page 8 of 14
RFM [ RF MONOLITHICS, INC ]
