RX6001 Datasheet, PDF (7/10 Pages) RF Monolithics, Inc – 868.35 MHz Hybrid Receiver

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.
Pulse Generator Timing
In the low data rate mode, the interval t_PRI between the falling edge of an
ON pulse to the first RF amplifier and the rising edge of the next ON pulse
to the first RF amplifier is set by a resistor R_PR between the PRATE pin and
ground. The interval can be adjusted between 0.1 and 5 µs with a resistor
in the range of 51 K to 2000 K. The value of the R_PR is given by:
R_PR = 404* t_PRI + 10.5, where t_PRI is in µs, and R_PR is in kilohms
In the high data rate mode (selected at the PWIDTH pin) the receiver RF
amplifiers operate at a nominal 50%-50% duty cycle. In this case, the peri-
od t_PRC from the start of an ON pulse to the first RF amplifier to the start of
the next ON pulse to the first RF amplifier is controlled by the PRATE re-
sistor over a range of 0.1 to 1.1 µs using a resistor of 11 K to 220 K. In this
case R_PR is given by:
R_PR = 198* t_PRC - 8.51, where t_PRC is in µs and R_PR is in kilohms
In the low data rate mode, the PWIDTH pin sets the width of the ON pulse
to the first RF amplifier t_PW1 with a resistor R_PW to ground (the ON pulse
width to the second RF amplifier t_PW2 is set at 1.1 times the pulse width to
the first RF amplifier in the low data rate mode). The ON pulse width t_PW1
can be adjusted between 0.55 and 1 µs with a resistor value in the range
of 200 K to 390 K. The value of R_PW is given by:
R_PW = 404* t_PW1 - 18.6, where t_PW1 is in µs and R_PW is in kilohms
However, when the PWIDTH pin is connected to Vcc through a 1 M resis-
tor, the RF amplifiers operate at a nominal 50%-50% duty cycle, facilitating
high data rate operation. In this case, the RF amplifiers are controlled by
the PRATE resistor as described above.
LPF Group Delay
The low-pass filter group delay is a function of the filter 3 dB bandwidth,
which is set by a resistor R_LPF to ground at the LPFADJ pin. The minimum
3 dB bandwidth f_LPF = 1445/R_LPF, where f_LPF is in kHz, and R_LPF is in kilo-
hms.
The maximum group delay t_FGD = 1750/f_LPF = 1.21*R_LPF, where t_FGD is in
µs, f_LPF in kHz, and R_LPF in kilohms.
Receiver Event Timing, 3.0 Vdc, -40 to +85 °C
Event
Symbol
Time
Min/Max
Test Conditions
Notes
Turn On to Receive
t_PR 3*t_BBC + 15 ms max
10 ms supply voltage rise time
time until receiver operational
Sleep to RX
t_SR
3*t_BBC
max 1 µs CNTRL0/CNTROL 1 rise times
time until receiver operational
RX to Sleep
t_RS
10 µs
max 1 µs CNTRL0/CNTROL 1 fall times time until receiver is in power-down mode
AGC Engage
t_AGC
5 µs
max
1 µs rise time, -30 dBm signal
RFA1 switches from 35 to 5 dB gain
AGE Hold-In
t_AGH
C_AGC/19.1
min
CAGC in pF, t_AGH in µs
user selected; longer than t_PKD
PKDET Attack Time Constant t_PKA
C_PKD/4167
min
C_PKD in pF, t_PKA in µs
user selected
PKDET Decay Time Constant t_PKD
1000*t_PKA
min
t_PKD and t_PKA in µs
slaved to attack time
PRATE Interval
t_PRI
0.1 to 5 µs
range
low data rate mode
user selected mode
PWIDTH RFA1
t_PW1
0.55 to 1 µs
range
low data rate mode
user selected mode
PWIDTH RFA2
t_PW2
1.1*t_PW1
range
low data rate mode
user selected mode
PRATE Cycle
t_PRC
0.1 to 1.1 µs
range
high data rate mode
user selected mode
PWIDTH High (RFA1 & RFA2) t_PWH 0.05 to 0.55 µs range
high data rate mode
user selected mode
LPF Group Delay
t_FGD
1750/f_LPF
max
t_FGD in µs, f_LPF in kHz
user selected
LPF 3 dB Bandwidth
f_LPF
1445/R_LPF
min
f_LPF in kHz, R_LPF in kilohms
user selected
BBOUT-CMPIN Time Constant t_BBC
0.064*C_BBO
min
t_BBC in µs, C_BBO in pF
user selected
Table 1
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RX6001-062905
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