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DS1085LZ-5 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS1085LZ-5 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 21 page 1 of 21 021403 FEATURES § User-Programmable Frequency Synthesizer § Programmable From 4.1kHz to 66MHz § Dual Synchronous Outputs § 4.13MHz to 66MHz Reference Oscillator Output § 4.1kHz to 66MHz Main Oscillator Output § Single 3.0 to 3.6V Supply § Three Resolution Options § 2-Wire Serial Interface § 0.75% Absolute Accuracy § Nonvolatile (NV) Frequency Settings § No External Timing Components § Power-Down Mode ORDERING INFORMATION PIN ASSIGNMENT SO (150mil) PIN DESCRIPTION OUT1 - Main Oscillator Output OUT0 - Reference Oscillator Output VCC - Power-Supply Voltage GND - Ground CTRL1 - Control Pin for OUT1 CTRL0 - Control Pin for OUT0 SDA - 2-Wire Serial Data Input/Output SCL - 2-Wire Serial Clock DEVICE PACKAGE STEP SIZE OSCILLATOR OUTPUT RANGE DS1085LZ-5 150mil SO 5kHz 4.1kHz to 66MHz DS1085LZ-12 150mil SO 12.5kHz 4.1kHz to 66MHz DS1085LZ-25 150mil SO 25kHz 4.1kHz to 66MHz DESCRIPTION The DS1085L is a dual-output frequency synthesizer requiring no external timing components for operation. It can be used as a standalone oscillator or as a dynamically programmed, processor-controlled peripheral device. An internal master oscillator can be programmed from 33MHz to 66MHz with three resolution options of 5kHz, 12.5kHz, and 25kHz. A programmable 3-bit prescaler (divide-by-1, 2, 4, or 8) permits the generation of a reference oscillator output (OUT0) from the master, ranging from 4.13MHz to 66MHz. A second independent prescaler and a 1-to-1025 divider allow the generation of a main oscillator output (OUT1) from 4.1kHz to 66MHz. The two outputs, although synchronous with the master, can be independently programmed. The combination of programmable master oscillator, prescalers, and dividers allows the generation of thousands of user-specified frequencies. All master oscillator, prescaler, and divider settings are stored in NV (EEPROM) memory, providing a default value on power-up that allows it to be used as a standalone oscillator. A 2-wire serial interface allows in-circuit, on-the-fly programming of the master oscillator, prescalers (P0 and P1), and divider (N). This allows dynamic frequency modification, if required, or, for fixed-frequency applications, the DS1085L can be used with factory- or user-programmed values. DS1085L 3.3V EconOscillator Frequency Synthesizer www.maxim-ic.com SCL CTRL0 SDA CTRL1 OUT1 OUT0 VCC GND 8 7 6 5 1 2 3 4 EconOscillator is a trademark of Dallas Semiconductor. |
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