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參數資料
| 型號： | 935260845118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2200 MHz, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, SOT-369-1, SSOP-16 |
| 文件頁數： | 9/18頁 |
| 文件大小： | 172K |
| 代理商： | 935260845118 |
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UMA1021AM
Information as of 2000-08-16
UMA1021AM; Low-voltage frequency synthesizer for radio telephones
The UMA1021AM BICMOS device integrates a prescaler, programmable dividers, and a phase comparator to implement a phase-locked
loop.
The device is designed to operate from 3 NiCd cellsin pocket phones, with low current and nominal 3 V supplies.
The synthesizer operates at RF input frequencies up to 2.2 GHz with a fully programmable reference divider. All divider ratios are supplied
via a 3-wire serial programming bus.
Separate power and ground pins are provided to the analog (charge pump) and digital circuits. The ground leads should be externally
short-circuited to prevent large currents flowing across the die and thus causing damage. V
DD1 and VDD2 must also be at the same potential
(V
DD). VCC must be equal to or greater than VDD for wider control range of the Voltage Controlled Oscillator (VCO) e.g. VDD = 3 V and VCC =5
V.
The charge pump current (phase detector gain) is fixed by an external resistor at pin I
SET and controlled via the serial interface. Only a
passive loop filter is necessary; the charge pump functions within a wide voltage compliance range to improve the overall system
performance.
l
Low phase noise
l
Low current from 3 V supply
l
Fully programmable main divider
l
3-line serial interface bus
l
Independent fully programmable reference divider, driven from external crystal oscillator
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