Siemens 1218RF, Руководство пользователя, Страница: 3 / 9

1218RF USER'S MANUAL PAGE 3 OF 9
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 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 Min Max Unit
Operating ambient temperature range, TA -40 +85 °C
Operating supply voltage 2.4 3.6 V
RF characteristics, CC2590
Parameter Test condition MIN TYP MAX Unit
RF frequency range 2400 2483.5 MHz
Data rate Shaped 8FSK 5 Mbps
Output power Maximum output power setting 11 dBm
Receiver sensitivity 5 Mbps -87 dBm
Occupied bandwidth 99% energy bandwidth, 5 Mbps 3.8 MHz