LMX2433 Texas instruments

LMX2433

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LMX2433

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Описание

Using a proprietary digital-phase, locked-loop technique, 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 programmable charge pump. Both the RF and IF PLLs have dedicated fastlock circuitry with integrated time-out counters which require only a single word write to power up or change frequencies. The LMX243x devices are high-performance frequency synthesizers with integrated dual-modulus prescalers. A 32/33 or a 16/17 prescale ratio can be selected for the 5-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. Serial data is transferred to the devices through a three-wire interface (DATA, LE, CLK). A low voltage logic interface allows direct connection to 1.8-V devices. Supply voltages from 2.25 V to 2.75 V are supported.

Low Current Consumption
- LMX2430 (RF/IF): 2.8 mA/ 1.4 mA
- LMX2433 (RF/IF): 3.2 mA/ 2 mA
- LMX2434 (RF/IF): 4.6 mA/ 2.4 mA
2.25-V to 2.75-V Operation
Synchronous/Asynchronous Power Down
Multiple PLL Options:
- LMX2430 (RF/IF): 3 GHz /0.8 GHz
- LMX2433 (RF/IF): 3.6 GHz /1.7 GHz
- LMX2434 (RF/IF): 5 GHz /2.5 GHz
Programmable Charge-Pump Current Levels
- RF and IF: 1 or 4 mA
Fastlock With Integrated Time-Out Counters
Digital Filtered Lock-Detect Output
Analog Lock Detect (Push-Pull / Open-Drain)
1.8-V MICROWIRE Logic Interface

Integrated VCO	No
Output frequency (min) (MHz)	500
Output frequency (max) (MHz)	3600
Normalized PLL phase noise (dBc/Hz)	-218
Current consumption (mA)	3.2
Features	Fastlock, Programmable charge-pump current, Synchronous and asynchronous power down
1/f noise (10-kHz offset at 1-GHz carrier) (dBc/Hz)	-100
Rating	Catalog
Operating temperature range (°C)	-40 to 85
Lock time (µs) (typ)	Loop BW dependent