EWM-900-FDTC-HS Radiotronix, EWM-900-FDTC-HS Datasheet - Page 16

• Manufacturer Part Number: EWM-900-FDTC-HS
• Description: RF Modules & Development Tools Head Set
• Manufacturer: Radiotronix

Specifications of EWM-900-FDTC-HS

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: (HS) EWM-900-FDTC

EWM-900-FDTC Full Duplex Voice/Data Transceiver
Receiver Start-Up Time
Like the transmitter, the receiver start-up time is determined by the loop bandwidth of the PLL
loop filter. When the receiver is enabled by setting the RXE bit in the mode register to a 1, it can
take up to 20mSec for the receiver to be on-channel and ready to receive information.
Receiver Channel-Change Time
The channel change time for the receiver is the time it takes for the receiver to be locked onto the
new channel after programming the RX channel register.
For a 1MHz jump, the channel change time is 7mSec. For a 100kHz jump, the channel change
time is 5 mSec.
Receiver Audio Output (Audio Mode Only)
The receiver audio output is the analog signal directly from the FM demodulator. It is filtered by a
3rd order LPF with a cut-off frequency of 15kHz.
The audio signal is 600mV typically.
The receiver sensitivity can be increased for audio applications by using an external LPF with a
4kHz cutoff frequency.
Without this filter, the audio sensitivity is -109dBm for a 12dB SINAD. With this filter, the
sensitivity should improve by 3-6dB.
Receiver Data Output (Data Mode Only)
The receiver data output is the digital signal from the bit-slicer. It represents the binary data used
to modulate the transmitter in data applications. The data output is rail-to-rail and is compatible
with CMOS and TTL signal levels.
RSSI
The RSSI pin indicates the received signal strength of the incoming carrier via a DC voltage.
The RSSI dynamic range is 65dB. However, the LNA extends this dynamic.
The RSSI will indicate from -112 to -62dBm. The voltage range is 0.1 to 2.1 V with 0.1V
representing -62dBm.
NOTE: The RSSI is not a calibrated value. The actual signal range, dynamic range, and voltage
will vary from part to part. The LNA should be turned off by bringing LNAEN low whenever the
input signal level is above -70dBm.
Ordering Information
PRODUCT
EWM-900-FDTC-BS
EWM-900-FDTC-HS
Table 10, Ordering Information
EWM-900-FDTC Data Sheet
Page 12
ORDER CODE
100-900-01A
100-900-02A
Revision 1.2 - 2/11/2004
Data Sheet