Overview
The MC100EL1648DG, produced by onsemi, is a 5 V ECL (Emitter-Coupled Logic) Voltage Controlled Oscillator (VCO) amplifier. This device is designed to operate within an extended frequency range and is ideal for applications requiring a local oscillator or a fixed frequency clock. It utilizes advanced bipolar process technology and features an on-chip termination emitter resistor, facilitating direct ac-coupling of the output signal into a transmission line. The MC100EL1648DG is not suitable for use as a crystal oscillator and requires an external parallel tank circuit consisting of an inductor and capacitor, with the option to include a varactor diode for voltage-controlled tuning.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Operating Frequency | - | - | Up to 1100 | - | MHz |
| Power Supply Current (PECL Mode) | VCC = 5.0 V, VEE = 0 V | 13 | 19 | 25 | mA |
| Power Supply Current (NECL Mode) | VCC = 0 V, VEE = -5.0 V | 13 | 19 | 25 | mA |
| Input Voltage (PECL Mode) | VEE = 0 V | 0 | - | 6 | V |
| Input Voltage (NECL Mode) | VCC = 0 V | -6 | - | 0 | V |
| Output HIGH Voltage (PECL Mode) | VCC = 5.0 V, VEE = 0 V | 3950 | 4170 | 4610 | mV |
| Output LOW Voltage (PECL Mode) | VCC = 5.0 V, VEE = 0 V | 3040 | 3410 | 3600 | mV |
| Operating Temperature Range | - | -40 | - | 85 | °C |
| Storage Temperature Range | - | -65 | - | 150 | °C |
Key Features
- Typical operating frequency up to 1100 MHz
- Low power consumption: 19 mA at 5.0 Vdc
- PECL and NECL mode operating ranges: VCC = 4.2 V to 5.5 V with VEE = 0 V, and VCC = 0 V with VEE = -4.2 V to -5.5 V
- Input capacitance: 6.0 pF (typical)
- Pb-free devices
- On-chip termination emitter resistor for direct ac-coupling of the output signal
- No external pull-down resistor required for output
- Capable of driving one ECL load (3.0 pF)
Applications
- Local oscillators in various systems
- Electronic test equipment
- Digital high-speed telecommunications
- Fixed frequency clock applications
- Voltage-controlled oscillator applications using varactor diodes
Q & A
- What is the typical operating frequency range of the MC100EL1648DG?
The MC100EL1648DG can operate up to 1100 MHz.
- What are the power supply current specifications for PECL and NECL modes?
In PECL mode, the power supply current is 13-25 mA at VCC = 5.0 V and VEE = 0 V. In NECL mode, it is 13-25 mA at VCC = 0 V and VEE = -5.0 V.
- What is the input capacitance of the MC100EL1648DG?
The input capacitance is 6.0 pF (typical).
- Does the MC100EL1648DG require an external pull-down resistor for the output?
No, the MC100EL1648DG does not require an external pull-down resistor due to its on-chip termination emitter resistor.
- What types of applications is the MC100EL1648DG suitable for?
The MC100EL1648DG is suitable for local oscillators, electronic test equipment, digital high-speed telecommunications, and fixed frequency clock applications.
- Can the MC100EL1648DG be used as a crystal oscillator?
No, the MC100EL1648DG is not useable as a crystal oscillator.
- How does the MC100EL1648DG handle voltage-controlled tuning?
The MC100EL1648DG can be tuned using a varactor diode in the external tank circuit, allowing the oscillator frequency to be controlled by the voltage applied to the varactor.
- What is the operating temperature range of the MC100EL1648DG?
The operating temperature range is -40°C to +85°C.
- What is the storage temperature range of the MC100EL1648DG?
The storage temperature range is -65°C to +150°C.
- How can the output waveform be conditioned to produce a sine or square wave?
The output waveform can be conditioned by adjusting the AGC (Automatic Gain Control) pin. For a sine wave, a series resistor can be tied from the AGC point to the most negative power potential. For a square wave, especially at frequencies above 100 MHz, a series resistor can be tied from the AGC to the most positive power potential.
