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參數(shù)資料
| 型號(hào)： | MSM7712 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Wireless LAN Baseband Controller |
| 中文描述： | 無線局域網(wǎng)的基帶控制器 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 157K |
| 代理商： | MSM7712 |
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MSM7712
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14
Oki Semiconductor
Modulator radio requirements are:
6-bit DAC, clock at 32 MHz (offset binary).
Anti-alias filtering to extract the 24-MHz alias
(24 MHz IF will be -10 dB on 8 MHz fundamental from DAC output)
Gaussian filtering, to translate CP-FSK into G-FSK, in accordance with the IEEE 802.11 specification
(SAW filter at 240 MHz IF recommended)
Demodulator
The MSM7712 features a digital baseband demodulator, requiring an external discriminator. The
MSM7712 supports two modes:
1Mbit/s 2-ary FSK
2 Mbit/s 4-ary FSK.
Both modes require a 1-Mbit preamble of 80 bits of reversals and 16 bits UW for acquisition of carrier and
timing. The modem can then be switched to 2 Mbit/s if following headers require. Features of the
demodulator include:
Diversity switching control for two antennas.
RSSI threshold wake-up of demodulator
The demodulator offers three possible interfaces to a limiter/discriminator radio. The supported inter-
faces are:
Analog data slicer (1Mbit/s only)
Post discriminator 4-bit ADC (offset binary)
Post discriminator 1-bit ADC (provisional)
The demodulator’s radio requirements are:
1 Mbit: 20 dB S/N from discriminator 10
2 Mbit: 30 dB S/N from discriminator 10
Discriminator linearity of
4-bit discriminator-to-ADC ranging, to cover approximately
Carrier acquisition for analog slicer option within 4
square wave (demodulation provides signal for carrier lock switch once preamble detected.
RSSI threshold decision within 4
μ
s of antenna switching.
3-state ADC output during transmit (bus is shared with TxDAC).
-5
BER (802.11 specifies sensitivity of 10
BER (802.11specifies sensitivity of 10
5% required for specified 2 Mbit/s operation.
-5
for 80 dBm)
for 75 dBm)
-5
-5
±
±
360 KHz.
μ
s, yielding a duty cycle better than 60:40 for a
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