23S08-3DCG8

Differential - Input:Output:	No/No
Base Part Number:	IDT23S08-3
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C
Voltage - Supply:	3 V ~ 3.6 V
Divider/Multiplier:	No/Yes
Frequency - Max:	133.3MHz
Series:	--
Ratio - Input:Output:	1:8
Number of Circuits:	1
Output:	CMOS, LVTTL
Input:	LVTTL
PLL:	Yes with Bypass
Type:	Clock Multiplier, Zero Delay Buffer
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers

The 23S08-3DCG8 is a clock generator, phase-locked loop (PLL), and frequency synthesizer all in one integrated circuit. It is capable of supplying high-performance, robust clock and timing signals at various frequencies, and is specifically designed for applications such as cable and satellite receivers, multimedia entertainment systems, PC motherboard design, and digital video recorders.

Functionality and Features

The 23S08-3DCG8 operates as a clock generator, allowing it to generate multiple independent clock signals -- both high frequency and low frequency. Its outputs can be individually disabled and programmed in both directions, enabling the user to produce a mix of clock sources that can be used in multiple applications. With its PLL providing a synchronized output, the frequency of the device can be adjusted to provide a range of output frequencies of up to 400 kHz. In addition, the device provides a frequency synthesizer, allowing it to produce period-matched clock signals with programmable frequency and phase. The 23S08-3DCG8 also has several other features that can be used to further enhance its performance. These include input hysteresis, output slew rate control, frequency fine-tuning, and programmable power-down modes. Additionally, the device is RoHS compliant, with minimal electrical specifications and a small footprint.

Design Considerations

When designing a system with the 23S08-3DCG8, engineers need to consider several important design considerations. These include the power supply requirements and the output signal quality required. The device is designed to run off of a single-supply voltage of 2.5V to 3.8V, but it is important to ensure that the supply voltage is stable and free of noise. Moreover, the output signal should be properly filtered, as it can be susceptible to noise if not attended to. In addition, engineers must consider the overall design environment and select the appropriate package type. The device is available in an 8-pin SOIC package and a 14-pin TSSOP package, and a specialized package is available with an onboard voltage regulator if needed.

Working Principle

The 23S08-3DCG8 operates using a patented Phase-Locked Loop (PLL) based architecture. This architecture enables the device to generate robust, reliable clock and timing signals with very low jitter. The PLL converts an oscillating signal – such as a square wave or a crystal oscillator – into a signal that can be used to provide precision timing. The device then uses the PLL to generate a clock signal with the desired frequency and phase. This signal is then used to generate a variety of clock outputs, such as low-frequency clock signals and higher frequency PLL-generated clock outputs. The phase-locked loop is also used to synthesize clock signals with multiple frequencies, allowing the user to have a broad range of clock frequencies available.

Conclusion

The 23S08-3DCG8 is an ideal device for applications that require multiple independent clock signals or frequency-synthesized clocks. Its PLL-based architecture provides robust, reliable performance, with clock signals exhibiting very low jitter. When designing with the device, engineers should ensure that the power supply is stable, and that the output signal is properly filtered. It is also important to select the appropriate package for the design environment.

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