LMX2315  Product Folder

The LMX2315/2320/2325's are high performance frequency synthesizers with integrated prescalers designed for RF operation up to 2.5 GHz. They are fabricated using National's ABiC IV BiCMOS process.

A 64/65 or a 128/129 divide ratio can be selected for the LMX2315 and LMX2320 RF synthesizer at input frequencies of up to 1.2 GHz and 2.0 GHz, while 32/33 and 64/65 divide ratios are available in the 2.5 GHz LMX2325. Using a proprietary digital phase locked loop technique, the LMX2315/2320/2325's linear phase detector characteristics can generate very stable, low noise signals for controlling a local oscillator.

Serial data is transferred into the LMX2320 and the LMX2325 via a three line MICROWIRE™ interface (Data, Enable, Clock). Supply voltage can range from 2.7V to 5.5V. The LMX2315, LMX2320 and the LMX2325 feature very low current consumption, typically 6 mA, 10 mA and 11 mA respectively.

The LMX2315, LMX2320 and the LMX2325 are available in a TSSOP 20-pin surface mount plastic package.

• RF operation up to 2.5 GHz
• 2.7V to 5.5V operation
• Low current consumption
• Dual modulus prescaler: LMX2325: 32/33 or 64/65 LMX2320/LMX2315: 64/65 or 128/129
• Internal balanced, low leakage charge pump
• Power down feature for sleep mode: I_CC = 30 µA (typ) at V_CC = 3V
• Small-outline, plastic, surface mount TSSOP, 0.173[Prime] wide

• Cellular telephone systems (GSM, IS-54, IS-95, (RCR-27)
• Portable wireless communications (DECT, PHS)
• CATV
• Other wireless communication systems