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參數(shù)資料
| 型號： | PMB2240 |
| 廠商： | SIEMENS A G |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | GSM-Transmitter |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 9/31頁 |
| 文件大?。?/td> | 1663K |
| 代理商： | PMB2240 |
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The reproduction, transmission or use of this document is not permitted without express written authority. Offenders will be liable for damages. All
rights, including rights created by patent grant or registration of a utility model or design, are reserved.
Siemens AG
9
05.97
6XSSO\FRQFHSW
There are four independent supply voltages ( VCC1-3,VCCPR ) and ground rails ( GND1-4 ) to
decouple the modulator/mixer parts, the synthesizer parts, and the RFVCO parts.
The supply pin VCCPR is a separate prescaler supply, which openes the possilility to run the prescaler
together with the rest of the RF synthesizer on a supply voltage that is different from the supplies of the
rest of the chip
GND4 is a special shielding ground to decrease crosstalk between the separately supplied blocks.
GND5 collects the substrate contacts in the modulator and mixer.
It is recommended to connect all GND pins to a common GND on the board.
In the following figure the chip schematic is partitioned according to its supply rails.
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| PMB2251V1.3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Phase-Locked Loop |
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