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參數(shù)資料
| 型號(hào)： | RF137 |
| 英文描述： | Transceiver For GSM Applications |
| 中文描述： | 收發(fā)器的GSM應(yīng)用 |
| 文件頁(yè)數(shù)： | 9/15頁(yè) |
| 文件大?。?/td> | 114K |
| 代理商： | RF137 |
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Transceiver
RF137
100777C
Conexant - Proprietary
Data Subject to Change
9
October 11, 2000
There are two frequency synthesizers on the chip, one UHF and
one VHF. The UHF synthesizer can provide frequencies from
500 MHz to 2 GHz. It consists of a 32/33 modulus prescaler, a
13-bit R counter, an 18-bit N counter, a phase detector with lock
detection, and a charge pump. The VHF synthesizer, with a
frequency range from150 MHz to 450 MHz, consists of an 8/9
modulus prescaler, a 13-bit R counter, a 16-bit N counter, a
phase detector with lock detection, and a charge pump. Each
synthesizer has four charge pump current settings for optimal
performance.
The on-chip oscillator together with a few external components
as resonant elements, forma VHF VCO (Figure 3 shows the
VCO configuration). The differential VCO output is buffered and
then fed to three dividers (Rx, Tx, Sx) with a selectable divide
ratio of either 2 or 4. The Rx and Tx dividers are both
quadrature dividers, which generates in-phase and quadrature
phase LOs.
The on-chip oscillator with the on-chip VHF synthesizer,
provides complete VHF frequency synthesis for the Rx VHF LO
and Tx VHF LO.
The three-wire bus control allows the RF137 to be optimzed for
any desired frequency plan. It also programs the two on-chip
frequency synthesizers. To ensure that the data remains
latched, one of the signals TXENA, RXENA, or SXENA must
stay enabled.
When bit C0 is set to 1, it allows for divider selections in the
translation loop, high-side/low-side injection for the image reject
mxer and the receive IF amplifiers’ gain setting. When bit C0 is
set to 0, it programs the UHF/VHF synthesizer, the R/N counter,
charge pump polarity, charge pump output current, and
prescaler setting.
The three-wire bus timng diagramis provided in Figure 4.
Figure 5 illustrates a typical RF137 application circuit. Figure 6
provides the package dimensions for the 48-pin TQFP RF137
transceiver and Figure 7 provides the tape and reel dimensions.
ESD Sensitivity
Because the RF137 is a static-sensitive electronic device,
proper ESD precautions must be taken when using the RF137.
Do not operate or store the RF137 near strong electrostatic
fields.
VCC
External
Resonator
RF137
RES1
(pin 33)
RES2
(pin 32)
Vtune
C588
Figure 3. RF137 Internal VCO
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RF137-12 | 制造商:Conexant Systems Inc 功能描述:137-12 |
| RF1377-000 | 制造商:TE Connectivity 功能描述:- Bag 制造商:TE Connectivity 功能描述:POLYSWITCH PTC RESET 0.145A HOLD 制造商:TE CONNECTIVITY RAYCHEM-POLYSWITCH 功能描述:Tline / TRF250-145ST-B-0.5 |
| RF1378-000 | 制造商:TE Connectivity 功能描述:- Tape and Reel 制造商:TE Connectivity 功能描述:POLYSWITCH RESET FUSE 1.85A SMD 制造商:TE CONNECTIVITY RAYCHEM-POLYSWITCH 功能描述:SMD / ASMD185F-2 |
| RF1381-000 | 制造商:TE Connectivity 功能描述:- Trays 制造商:TE Connectivity 功能描述:GAS TUBE 5MM 230V 20% SMD 5KA 制造商:TE Connectivity 功能描述:GAS TUBE 5MM 90V 20% SMD 5KA 制造商:TE CONNECTIVITY RAYCHEM-POLYSWITCH 功能描述:GDT / GTCS35-231M-R05 |
| RF1382-000 | 制造商:TE Connectivity 功能描述:- Trays 制造商:TE CONNECTIVITY RAYCHEM-POLYSWITCH 功能描述:Gas Discharge Tubes 90VDC 5KADC 5AAC 1.2pF Solder Pad SMD |
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