RF Monolithics, Inc.

Phone: (972) 233-2903

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http://www.rfm.com

©1999 by RF Monolithics, Inc. The stylized RFM logo are registered trademarks of RF Monolithics, Inc.

TR3000-070105

Transceiver Event Timing

Transceiver event timing is summarized in Table 1. Please refer to this ta-

ble for the following discussions.

Turn-On Timing

tional at turn on is influenced by two factors. All receiver circuitry will be op-

erational 5 ms after the supply voltage reaches 2.2 Vdc. The BBOUT-

CMPIN coupling-capacitor is then DC stabilized in 3 time constants

power supply rise time is:

The maximum time required for either the OOK or ASK transmitter mode to

become operational is 5 ms after the supply voltage reaches 2.2 Vdc.

Receive-to-Transmit Timing

After turn on, the maximum time required to switch from receive to either

transmit mode is 12 µs. Most of this time is due to the start-up of the trans-

mitter oscillator.

Transmit-to-Receive Timing

The maximum time required to switch from the OOK or ASK transmit mode

capacitor time constant. When the operating temperature is limited to 60

for short transmissions, as less charge leaks away from the

BBOUT-CMPIN coupling capacitor.

Sleep and Wake-Up Timing

The maximum transition time from the receive mode to the power-down

(1 µs fall time).

The maximum transition time from either transmit mode to the sleep mode

(1 µs fall time).

to switch from sleep to receive is dramatically less for short sleep times, as

less charge leaks away from the BBOUT- CMPIN coupling capacitor.

The maximum time required to switch from the sleep mode to either trans-

the transmitter oscillator.

AGC Timing

dBm RF signal with a 1 µs envelope rise time.

The minimum AGC hold-in time is set by the value of the capacitor at the

Peak Detector Timing

The Peak Detector attack time constant is set by the value of the capacitor

Pulse Generator Timing

ON pulse to the first RF amplifier and the rising edge of the next ON pulse

ground. The interval can be adjusted between 0.1 and 5 µs with a resistor

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-

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

In the low data rate mode, the PWIDTH pin sets the width of the ON pulse

can be adjusted between 0.55 and 1 µs with a resistor value in the range

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,

hms.