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RX5001 Datasheet(PDF) 7 Page - RF Monolithics, Inc |
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RX5001 Datasheet(HTML) 7 Page - RF Monolithics, Inc |
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7 / 10 page  RF Monolithics, Inc. Phone: (972) 233-2903 Fax: (972) 387-8148 E-mail: info@rfm.com Page 7 of 10 RFM Europe Phone: 44 1963 251383 Fax: 44 1963 251510 http://www.rfm.com ©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc. RX5001-062805 Peak Detector Timing The Peak Detector attack time constant is set by the value of the capacitor at the PKDET pin. The attack time tPKA = CPKD/4167, where tPKA is in µs and CPKD is in pF. The Peak Detector decay time constant tPKD = 1000*tPKA. Pulse Generator Timing In the low data rate mode, the interval tPRI 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 RPR 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 RPR is given by: RPR = 404* tPRI + 10.5, where tPRI is in µs, and RPR 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 tPRC 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 RPR is given by: RPR = 198* tPRC - 8.51, where tPRC is in µs and RPR is in kilohms In the low data rate mode, the PWIDTH pin sets the width of the ON pulse to the first RF amplifier tPW1 with a resistor RPW to ground (the ON pulse width to the second RF amplifier tPW2 is set at 1.1 times the pulse width to the first RF amplifier in the low data rate mode). The ON pulse width tPW1 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 RPW is given by: RPW = 404* tPW1 - 18.6, where tPW1 is in µs and RPW 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 RLPF to ground at the LPFADJ pin. The minimum 3 dB bandwidth fLPF = 1445/RLPF, where fLPF is in kHz, and RLPF is in kilo- hms. The maximum group delay tFGD = 1750/fLPF = 1.21*RLPF, where tFGD is in µs, fLPF in kHz, and RLPF in kilohms. Receiver Event Timing, 3.0 Vdc, -40 to +85 °C Event Symbol Time Min/Max Test Conditions Notes Turn On to Receive tPR 3*tBBC + 15 ms max 10 ms supply voltage rise time time until receiver operational Sleep to RX tSR 3*tBBC max 1 µs CNTRL0/CNTROL 1 rise times time until receiver operational RX to Sleep tRS 10 µs max 1 µs CNTRL0/CNTROL 1 fall times time until receiver is in power-down mode AGC Engage tAGC 5 µs max 1 µs rise time, -30 dBm signal RFA1 switches from 35 to 5 dB gain AGE Hold-In tAGH CAGC/19.1 min CAGC in pF, tAGH in µs user selected; longer than tPKD PKDET Attack Time Constant tPKA CPKD/4167 min CPKD in pF, tPKA in µs user selected PKDET Decay Time Constant tPKD 1000*tPKA min tPKD and tPKA in µs slaved to attack time PRATE Interval tPRI 0.1 to 5 µs range low data rate mode user selected mode PWIDTH RFA1 tPW1 0.55 to 1 µs range low data rate mode user selected mode PWIDTH RFA2 tPW2 1.1*tPW1 range low data rate mode user selected mode PRATE Cycle tPRC 0.1 to 1.1 µs range high data rate mode user selected mode PWIDTH High (RFA1 & RFA2) tPWH 0.05 to 0.55 µs range high data rate mode user selected mode LPF Group Delay tFGD 1750/fLPF max tFGD in µs, fLPF in kHz user selected LPF 3 dB Bandwidth fLPF 1445/RLPF min fLPF in kHz, RLPF in kilohms user selected BBOUT-CMPIN Time Constant tBBC 0.064*CBBO min tBBC in µs, CBBO in pF user selected Table 1 |
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