RDS010 900MHz Direct Digital Frequency Synthesizer (DDFS)

Product catalog summary

Product Overview: The RDS010 is a high-performance Direct Digital Frequency Synthesizer (DDFS) operating at 900MHz, designed for ultra-high speed applications. It features a 32-bit frequency resolution, dual frequency and phase control registers, and an integrated 12-bit DAC, operating with a 3.3V power supply and dissipating 3.5W of power.

Key Specifications:

Clock Frequency: 900MHz
Tuning Bandwidth: 0 to 450MHz
Phase Modulation: 12-bit
Output Power: 0dBm
Package: 88 Pin QFP Hermetic Ceramic

Absolute Maximum Ratings: The device can operate within a supply voltage range of -1V to +4V and withstand temperatures from -40°C to +125°C, with a maximum junction temperature of +100°C.

Electrical Specifications: The RDS010 offers a spurious-free dynamic range (SFDR) of up to 72dBc at 900MHz clock frequency, supporting differential LVPECL clock inputs and outputs, with a maximum clock input frequency of 900MHz.

Operating Conditions: Requires a 3.3V supply voltage for both analog and digital operations, with a case temperature range of -15°C to +85°C.

Pin Description: Detailed pin layout includes power supply pins (VDD, VDDA), ground pins (GND), and various input/output pins for clock, data, and control signals.

Theory of Operation: Integrates a numerically controlled oscillator (NCO) and a DAC, with the NCO consisting of input, accumulator, and phase-to-amplitude mapping blocks. The DAC uses 4-bit segmentation and 8-bit binary-weighted codes for high-speed performance.

Programming: Involves writing 32-bit input data to control registers and loading them into the accumulator, controlled by signals such as LSEL, RSELF, RSELP, and PROG.

Timing Diagrams: Includes diagrams illustrating input register programming, NCO load, output clock reset, and latency.

Typical Operating Circuit: Provides a visual representation of the typical operating circuit for the RDS010-QP, depicted in Figure 6.

Typical Performance: Figures 7, 8, and 9 illustrate performance characteristics with a clock frequency of 900MHz, showing SFDR as a function of output frequency and signal spectrum at output frequencies of 68MHz and 341MHz.

Package Information: Housed in an 88 lead ceramic Quad Flat Pack (QFP) with a heat sink slug at the bottom, with leads trimmed to 0.045 inches (1.15mm) from the package edge. Thermal impedance from junction to base is approximately 3.5 °C/W.

Regulatory Information: Subject to U.S. Export Law under ITAR, approved for public release by the DOD Office of Security Review, Case 08-S-0597.

Disclaimer: Teledyne Scientific Company reserves the right to modify product specifications without notice. Information is believed to be accurate, but no responsibility is assumed for its use.

Catalog excerpts

RDS010 900MHz Direct Digital Frequency Synthesizer (DDFS)-1

RDS010 DATASHEET DS_0044PA1-0508 The product represented in this datasheet is subject to U.S. Export Law as contained in the International Traffic in Arms Regulations (ITAR) Public Domain Information – Previously Approved for Public Release (DOD Office of Security Review, Case 08-S-0597) Teledyne Scientific Company reserves the right to make changes to its product specifications at any time without notice. The information furnished herein is believed to be accurate; however, no responsibility is assumed for its use. Page 1 of 11 RDS010 900MHz Direct Digital Frequency Synthesizer (DDFS) Features 900MHz Clock Frequency 0 to 450MHz Tuning Bandwidth 32Bit Frequency Resolution Dual Frequency Control Register 12Bit Phase Modulation Dual Phase Control Register Latency of 23 Clock Cycles Integrated 12Bit DAC 60dBc SFDR 0dBm Output Power 3.3V Power Supply 3.5W Power Dissipation CMOS compatible Data Inputs Internally Terminated Outputs 88 Pin QFP Hermetic Ceramic Package Product Description The RDS010 is a high performance SiGe direct digital frequency synthesizer (DDS) with a clock frequency of 900MHz. The RDS010 has been optimized for ultra-high speed applications, achieving better than 60dBc of spurious output at 900MHz reference clock frequency. On-chip DAC outputs are internally terminated with 50Ù resistors for better dynamic performance. Ordering information PART NUMBER DESCRIPTION RDS010-QP 900MHz DDFS, QFP Package RDS010-DI 900MHz 32Bit FCW DDFS, DIE EVRDS010-QP RDS010-QP Evaluation Board Figure 1 - Functional Block Diagram

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