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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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LMX2430 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI) |
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LMX2430 bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI) |
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1 / 49 page  LMX2430/LMX2433/LMX2434 PLLatinum™ Dual High Frequency Synthesizer for RF Personal Communications LMX2430 3.0 GHz/0.8 GHz LMX2433 3.6 GHz/1.7 GHz LMX2434 5.0 GHz/2.5 GHz General Description The LMX243x devices are high performance frequency syn- thesizers with integrated dual modulus prescalers. The LMX243x devices are designed for use as RF and IF local oscillators for dual conversion radio transceivers. A 32/33 or a 16/17 prescale ratio can be selected for the 5.0 GHz LMX2434 RF synthesizer. An 8/9 or a 16/17 prescale ratio can be selected for both the LMX2430 and LMX2433 RF synthesizers. The IF circuitry contains an 8/9 or a 16/17 prescaler. Using a proprietary digital phase locked loop tech- nique, the LMX243x devices generate very stable, low noise control signals for RF and IF voltage controlled oscillators. Both the RF and IF synthesizers include a two-level pro- grammable charge pump. Both the RF and IF synthesizers have dedicated Fastlock circuitry with integrated timeout counters. Furthermore, only a single word write is required to power up and tune the synthesizers to a new frequency. Serial data is transferred to the devices via a three-wire interface (DATA, LE, CLK). A low voltage logic interface allows direct connection to 1.8V devices. Supply voltages from 2.25V to 2.75V are supported . The LMX243x family features low current consumption: LMX2430 (3.0 GHz/ 0.8 GHz) — 2.8 mA/ 1.4 mA, LMX2433 (3.6 GHz/ 1.7 GHz) — 3.2 mA/ 2.0 mA, LMX2434 (5.0 GHz/ 2.5 GHz) — 4.6 mA/ 2.4 mA at 2.50V. The LMX243x devices are available in 20-Pin TSSOP and 20-Pin UTCSP surface mount plastic packages. Features n Low Current Consumption n 2.25V to 2.75V Operation n Selectable Synchronous or Asynchronous Powerdown Mode n Selectable Dual Modulus Prescaler: LMX2430 RF: 8/9 or 16/17 LMX2433 RF: 8/9 or 16/17 LMX2434 RF: 16/17 or 32/33 LMX243x IF: 8/9 or 16/17 n Programmable Charge Pump Current Levels RF and IF: 1 or 4 mA n Fastlock™ Technology with Integrated Timeout Counters n Digital Filtered Lock Detect Output n Analog Lock Detect Output (supports both Push-Pull and Open Drain configurations) n 1.8V MICROWIRE Logic Interface n Available in 20-Pin TSSOP and 20-Pin UTCSP Applications n Mobile Handsets (GSM, GPRS, W-CDMA, CDMA, PCS, AMPS, PDC, DCS) n Cordless Handsets (DECT, DCT) n Wireless Data n Cable TV Tuners Thin Shrink Small Outline Package (MTC20) Ultra Thin Chip Scale Package (SLE20A) 20053580 20053581 PLLatinum™ is a trademark of National Semiconductor Corporation. May 2003 © 2003 National Semiconductor Corporation DS200535 www.national.com |
Số phần tương tự - LMX2430 |
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Mô tả tương tự - LMX2430 |
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