Overview; Operation; Performance - Siemens 1218RF User Manual

1 Overview

The 1218RF module is a wireless lossless audio interface based on the Texas Instruments CC8520 PurePath™ Wireless
SoC. The module incorporates the crystal, the required RF matching, power supply filtering and filtering on the digital
interface for FCC compliance. The module incorporates a CC2590 range extender with power amplifier for increased
output power and LNA for improved receiver sensitivity.
The module has two antenna options:
- Single antenna
- Dual antenna with antenna diversity using an AS222-92 switch.
The module can be programmed to act both as master and as slave where the master dictates the audio sample rate
and selects the rf channels, antenna diversity is only available on slave modules.

2 Operation

The 1218RF is a wireless lossless digital audio link based on the Texas Instruments CC8520 PurePath™ Wireless SoC.
It uses multiple techniques for excellent robustness and co-existence.
- Adaptive frequency hopping
- Forward error correction
- Buffering and retransmission
- Error concealment
It interfaces to audio ADCs, DACs and CODECs through an I2S digital audio interface.
The 1218RF module incorporates a CC2590 range extender with power amplifier that has a gain of 14dB, maximum
output power equals +14 dBm (25 mW). Antenna diversity is available on slave modules to reduce effects of RF
multipath fading. The 1218RF module is based on the Texas Instruments CC85XX-CC2590EM_Antenna_Diversity
reference design.
All CC8520 SoC signals are available on 1218RF pins, allowing access to all features of the CC8520 SoC. A complete
overview of the features can be found in the "CC85xx Family User's Guide".

3 Performance

The power supply on the 1218RF module is filtered but not regulated. To comply with FCC regulations the carrier must
provide a regulated supply.
Recommended operating conditions
Parameter
Operating ambient temperature range, TA
Operating supply voltage
RF characteristics, CC8520 + CC2590
Parameter Test condition
RF frequency range
Data rate Shaped 8FSK
Output power Maximum output power setting
Receiver sensitivity 5 Mbps
Occupied bandwidth 99% energy bandwidth, 5 Mbps
1218RF USER'S MANUAL
Min Max Unit
-40 +85 °C
2.4 3.6 V
MIN TYP
2400
5
11
-87
3.8
MAX Unit
2483.5 MHz
Mbps
dBm
dBm
MHz
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