LMX2346 Datasheet | National Semiconductor

Description The LMX2346/7 are high performance frequency synthesizers with an integrated 32/33 dual modulus prescaler. The LMX2346 is designed for RF operation up to 2.0 GHz. The LMX2347 is designed for RF operation up to 2.5 GHz. Using a proprietary digital phase locked loop technique, the LMX2346/7 generates very stable, low noise control signals for UHF and VHF voltage controlled oscillators. Serial data is transferred into the LMX2346/7 via a three-line MICROWIRE interface (DATA, LE, CLOCK). Supply voltage range is from 2.7V to 5.5V. The charge pump provides 4 m A output current. The LMX2346/7 are manufactured using National’s 0.5µ ABi C V silicon Bi CMOS process and is available in 16-pin TSSOP and 16-pin CSP packages. Features n n n n n n n RF operation up to 2.5 GHz 2.7V to 5.5V operation Digital & Analog Lock Detect 32/33 Dual modulus prescaler Excellent Phase Noise Internal balanced, low leakage charge pump Pin patible to LMX2323 Applications n Cellular DCS/PCS/3G infrastructure equipment n Wireless Local Area Networks (WLANs) n Other wireless munication systems Functional Block Diagram PLLatinum™ is a trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation DS200384 .national. LMX2346/LMX2347 Connection Diagrams 16-Pin TSSOP Package NS Package Number MTC16 16-Pin Chip Scale Package NS Package Number SLB16A Pin Descriptions Pin Number Pin Name OSCIN 16-Pin CSP 15 16-Pin I/O TSSOP 1 I Description Reference oscillator input. A CMOS inverting gate input. The input has a VCC/2 input threshold and can be driven from an external CMOS or TTL logic gate. I/O Circuit Configuration VP VCC 1 2 3 4 - Charge Pump Power Supply. Must be equal to VCC. - Main Power Supply. VCC may range from 2.7V to 5.5V. Bypass capacitors should be placed as close as possible to this pin and be connected directly to the ground plane. O Charge Pump output. For connection to a loop filter for driving the voltage...