LMX2531LQ1500E Datasheet | National Semiconductor

Description The LMX2531LQ1500E is a low power, high performance frequency synthesizer system which includes a fully integrated delta-sigma PLL and VCO with fully integrated tank circuit. The third and fourth poles are also integrated and also adjustable. Also included are integrated ultra-low noise and high precision LDOs for the PLL and VCO which give higher supply noise immunity and also more consistent performance. When bined with a high quality reference oscillator, the LMX2531LQ1500E generates very stable, low noise local oscillator signals for up and down conversion in wireless munication devices. The LMX2531LQ1500E is a monolithic integrated circuit, fabricated in an advanced Bi CMOS process. There are several different versions of this product in order to acdate different frequency bands. Device programming is facilitated using a three-wire MICROWIRE Interface that can operate down to 1.8 volts. Supply voltage range is 2.8 to 3.2 Volts. The LMX2531LQ1500E is available in a 36 pin 6x6x0.8 mm Lead-Free Leadless Leadframe Package (LLP). Features PLL Features - Fractional-N Delta Sigma Modulator Order programmable up to 4th order - Fast Lock/Cycle Slip Reduction with Timeout Counter - Partially integrated, adjustable Loop Filter - Very low phase noise and spurs VCO Features - Integrated tank inductor - Low phase noise - 1499 - 1510 MHz Output Frequency - 749.5 - 755 MHz Output Frequency (Divide by 2 Mode) Other Features - 2.8 V to 3.2 V Operation - Low Power-Down Current - 1.8V MICROWIRE Support - Package: 36 Lead LLP Target Applications n Data Converting Clocking © 2006 National Semiconductor Corporation DS201950 .national. Functional Block Diagram .national. Connection Diagram Pin Descriptions Pin # 1 3 2,4,5,7, 12, 13, 29, 35 6 8 9 10 Pin Name Vcc DIG GND I/O Description Power Supply for digital LDO circuitry. Input may range from 2.8 - 3.2 V. Bypass capacitors should be placed as close as possible...