參數(shù)資料
型號(hào)： 1200
廠商： TEXAS INSTRUMENTS INC
元件分類： 無(wú)繩電話/電話
英文描述： TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC20
封裝： 4 X 4 MM, ROHS COMPLIANT, QLP-20
文件頁(yè)數(shù)： 16/70頁(yè)
文件大?。?/td> 841K
代理商： 1200
Chipcon
SmartRF CC1100
Chipcon AS
SmartRF
CC1100 Preliminary Data Sheet (rev. 1.0) 2005-04-25
Page 23 of 68
The
CC1100 supports channel filter bandwidths
between 54-63kHz and 600-700kHz
1. Above
300kHz bandwidth, however, the sensitivity
and blocking performance may be somewhat
degraded.
For best performance, the channel filter
bandwidth should be selected so that the
signal bandwidth occupies at most 80% of the
channel filter bandwidth. The channel centre
1
The combination of CHANBW_E=0 and
CHANBW_M=0 is not supported. Exact limits
depend on crystal frequency.
tolerance due to crystal accuracy should also
be subtracted from the signal bandwidth. The
following example illustrates this:
With the channel filter bandwidth set to
500kHz, the signal should stay within 80% of
500kHz, which is 400kHz. Assuming 915MHz
frequency and ±20ppm frequency uncertainty
for both the transmitting device and the
receiving
device,
the
total
frequency
uncertainty is ±40ppm of 915MHz, which is
±37kHz. If the whole transmitted signal
bandwidth is to be received within 400kHz, the
transmitted
signal
bandwidth
should
be
maximum 400kHz–237kHz, which is 326kHz.
22 Demodulator, Symbol Synchronizer and Data Decision
CC1100 contains an advanced and highly
configurable demodulator. Channel filtering
and
frequency
offset
compensation
is
performed digitally. To generate the RSSI level
(see section 25.2 for more information) the
signal level in the channel is estimated. Data
filtering
is
also
included
for
enhanced
performance.
22.1
Frequency Offset Compensation
When using 2-FSK, GFSK or MSK modulation,
the demodulator will compensate for the offset
between
the
transmitter
and
receiver
frequency, within certain limits, by estimating
the centre of the received data. This value is
available in the FREQEST status register.
By issuing the SAFC command strobe, the
measured offset, FREQEST.FREQOFF_EST,
can automatically be used to adjust the
frequency offset programming in the frequency
synthesizer. This will add the current RX
frequency offset estimate to the value in
which
adjust
the
synthesizer frequency. Thus, the frequency
offset will be compensated in both RX and TX
when the SAFC command strobe is used.
To avoid compensating for frequency offsets
measured without a valid signal in the RF
channel, FREQEST.FREQOFF_EST is copied
to an internal register when issuing the SAFC
strobe in RX, and when a synch word is
detected. If SAFC was issued in RX, this
internal value is added to FSCTRL0.FREQOFF
after exiting RX. Issuing SAFC when not in RX
will immediately add the internal register value
to FSCTRL0.FREQOFF. Thus, the SAFC strobe
should be issued when currently receiving a
packet, or outside the RX state.
Note that frequency offset compensation is not
supported for ASK or OOK modulation.
22.2
Bit Synchronization
The bit synchronization algorithm extracts the
clock from the incoming symbols. The
algorithm requires that the expected data rate
is programmed as described in Section 20 on
page 22. Re-synchronization is performed
continuously to adjust for error in the incoming
symbol rate.
22.3
Byte synchronization
Byte synchronization is achieved by a
continuous sync word search. The sync word
is a 16 or 32 bit configurable field that is
automatically inserted at the start of the packet
by the modulator in transmit mode. The
demodulator uses this field to find the byte
boundaries in the stream of bits. The sync
word will also function as a system identifier,
since only packets with the correct predefined
sync word will be received. The sync word
detector correlates against the user-configured
16-bit sync word. The correlation threshold
can be set to 15/16 bits match or 16/16 bits
match. The sync word can be further qualified
using
the
preamble
quality
indicator
mechanism described below and/or a carrier
sense
condition.
The
sync
word
is
programmed with SYNC1 and SYNC0.
In order to make false detections of sync
words less likely, a mechanism called
preamble quality indication (PQI) can be used
相關(guān)PDF資料
PDF描述
1200 TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT
1203CLUXE7/1NF PUSHBUTTON SWITCH, SPST, MOMENTARY, 3A, 12VDC, PANEL MOUNT-THREADED
1223ALUXE2UL-CSA PUSHBUTTON SWITCH, SPST, MOMENTARY, 8A, 12VDC, PANEL MOUNT-THREADED
1203ALUXE6UL-CSA PUSHBUTTON SWITCH, SPST, MOMENTARY, 8A, 12VDC, PANEL MOUNT-THREADED
1203CLUXE6NF PUSHBUTTON SWITCH, SPST, MOMENTARY, 3A, 12VDC, PANEL MOUNT-THREADED
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
1200 (4"X100FT) 制造商:3M Electronic Products Division 功能描述:TAPE, INSULATION, VINYL, BLACK 4INX100FT, Tape Type:Electrical Insulation, Tape
12000 制造商:Carclo Technical Plastics 功能描述:50MM TRIPLE HOLDER
120-00 制造商:HITEC 功能描述:DEPTH GAUGE VERNIER 制造商:HITEC 功能描述:DEPTH GAUGE, VERNIER
1200-0.3 制造商:VIDEK 功能描述:LEAD BNC PLG-PLG 0.3M 制造商:VIDEK 功能描述:LEAD, BNC PLG-PLG, 0.3M 制造商:VIDEK 功能描述:COAXIAL CABLE, RG-58, 0.3M, BLACK; Coaxial Cable Type:RG58; Cable Length - Imperial:11.81"; Cable Length - Metric:300mm; Connector Type A:BNC Straight Plug; Connector Type B:BNC Straight Plug; Jacket Color:Beige ;RoHS Compliant: Yes
120000 功能描述:環(huán)境檢測(cè)設(shè)備 PH METER ECONOMY RoHS:否 制造商:Fluke 設(shè)備類型:Vibration Meter 測(cè)量?jī)x器:Vibration
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*