1. Overview & Versions

️· Product: PLL620 Series Crystal Oscillator (Phase-Locked Loop oscillator)
️· Function: Generates precise, stable clock signals.
️· Versions: The PLL620 series offers three output signal formats:
- CMOS: General-purpose, compatible with a wide range of digital circuits.
- LVDS (Low-Voltage Differential Signaling): Designed for high-speed data transmission over relatively short distances. Offers improved noise immunity.
- PECL (Positive Emitter Coupled Logic): High-speed logic standard; typically used in telecommunications and other demanding applications.
️· Key Feature: Phase-locked loop (PLL) allows for frequency multiplication and stabilization.

2. Pin Descriptions (Generalized - Some pins vary slightly based on version)

️· Y: Output Signal (CMOS, LVDS, or PECL)
️· NC: No Connect (Unused pin; should not be connected to anything).
️· VDD: Positive Supply Voltage (Voltage level depends on the version: see Electrical Characteristics below)
️· GND: Ground
️· DRIVSEL (PLL620-06 CMOS Only): Selects between High Drive and Standard Drive output current for the CMOS version. (Allows for adjusting output drive strength).

3. Electrical Characteristics (Summarized by Version)

*Note: Values are representative; refer to the full datasheet for detailed specifications.*

3.1 CMOS Version

️· Supply Voltage (VDD): 3.3V ± 10% (Typical 3.3V)
️· Output Drive Current (Standard): 10 mA
️· Output Drive Current (High Drive - PLL620-06 only): 30 mA
️· Output Voltage Levels:
- VOH (High): VDD – 0.4V
- VOL (Low): 0.4V
️· Rise/Fall Times: Around 2.4 ns (Standard), 1.2ns (High Drive)

3.2 LVDS Version

️· Supply Voltage (VDD): 3.3V ± 10%
️· Output Differential Voltage (VOD): 247 – 355 mV (typical around 355 mV) – This is the voltage *difference* between the LVDS output signals.
️· Output Voltage Levels:
- VOH: 1.4 - 1.6V
- VOL: 0.9 - 1.1 V
️· Important: LVDS signals are *differential*, meaning they are transmitted as a pair of signals with opposite polarity.

3.3 PECL Version

️· Supply Voltage (VDD): 3.3V ± 10% (Exact value often specified as part of the part number; e.g. 3.3V or 5V)
️· Output Voltage Levels:
- VOH: VDD – 1.025V
- VOL: VDD – 1.620V
️· Important: PECL also uses differential signals for high speed performance.

4. Key Performance Specifications (Across all versions)

️· Frequency Range: The datasheet doesn't explicitly state the full range, but the PLL architecture suggests it can handle a wide range of frequencies.
️· Phase Noise: Excellent phase noise performance (see Phase Noise Specifications section; values listed in dBc/Hz). This indicates good signal purity.
️· Jitter: Low jitter (see Jitter Specifications section - e.g. random jitter, integrated jitter). Jitter is unwanted variation in the timing of the signal.
️· PLL Lock Time: Not explicitly stated but a characteristic of PLL devices.

5. Package Information

️· Type: LCC (Leadless Chip Carrier) – a small, surface-mount package.
️· Dimensions: Detailed dimensional information is provided in the Package Information section (length, width, pin spacing, etc.). These dimensions vary slightly depending on the precise part number.

6. Important Considerations & Limitations

️· Supply Voltage: Verify the correct supply voltage for the specific version of the oscillator. Incorrect voltage can damage the device.
️· Termination: LVDS and PECL signals typically require specific termination resistors to match impedance and prevent signal reflections. Refer to application notes for details.
️· Operating Environment: Consider the device's operating temperature range.
️· Datasheet Errors: As with any datasheet, double-check critical parameters against the manufacturer's website for any errata or updates.