Overview
The STW81200TR, produced by STMicroelectronics, is a wideband RF PLL (Phase-Locked Loop) frequency synthesizer that combines both Fractional-N and Integer-N architectures. This device is designed to provide high performance and flexibility in various RF applications. It features three low phase-noise VCOs (Voltage-Controlled Oscillators) with a fundamental frequency range of 3.0 GHz to 6.0 GHz. The synthesizer includes a programmable dual RF output divider stage, allowing output frequencies to range from 46.875 MHz to 6 GHz. The integration of low-noise LDO voltage regulators and internally matched broadband RF outputs optimizes the size and cost of the final application.
Key Specifications
| Specification | Value |
|---|---|
| Output Frequency Range | 46.875 MHz to 6 GHz |
| VCO Frequency Range | 3.0 GHz to 6.0 GHz |
| Phase Noise (Normalized in-band phase noise floor) | -227 dBc/Hz |
| VCO Phase Noise | -135 dBc/Hz @ 1 MHz offset, 4.0 GHz carrier |
| Noise Floor | -160 dBc/Hz |
| RF Output Divider | Programmable by 1/2/4/8/16/32/64 |
| Supply Voltage | 3.0 V to 5.4 V |
| Maximum Phase Detector Frequency | 100 MHz |
| Reference Clock Input | Differential (LVDS and LVECPL compliant) up to 800 MHz |
| Package Type | VFQFPN36 (6x6 mm, 0.5 mm pitch) |
| Process Technology | BICMOS 0.25 µm SiGe |
Key Features
- Dual architecture frequency synthesizer: Fractional-N and Integer-N
- Integrated VCOs with automatic center frequency calibration
- Dual RF Output broadband matched with programmable power level and mute function
- External VCO option with 5 V charge pump
- Integrated low noise LDO voltage regulators
- Fast lock and cycle slip reduction
- Digital lock detector
- Integrated reference crystal oscillator core
- R/W SPI interface
- Logic compatibility/tolerance 1.8 V/3.3 V
- Low power functional mode
Applications
- Cellular/4G infrastructure equipment
- Instrumentation and test equipment
- Cable TV
- Other wireless communication systems
Q & A
- What is the output frequency range of the STW81200TR?
The output frequency range is from 46.875 MHz to 6 GHz.
- What is the phase noise performance of the STW81200TR?
The normalized in-band phase noise floor is -227 dBc/Hz, and the VCO phase noise is -135 dBc/Hz @ 1 MHz offset, 4.0 GHz carrier.
- What are the supply voltage requirements for the STW81200TR?
The supply voltage ranges from 3.0 V to 5.4 V.
- Does the STW81200TR support external VCO?
- What is the package type of the STW81200TR?
The package type is VFQFPN36 (6x6 mm, 0.5 mm pitch).
- What are the key applications of the STW81200TR?
The key applications include cellular/4G infrastructure equipment, instrumentation and test equipment, cable TV, and other wireless communication systems.
- Does the STW81200TR have a low power mode?
- What is the maximum phase detector frequency of the STW81200TR?
The maximum phase detector frequency is 100 MHz.
- What type of interface does the STW81200TR use for programming?
The STW81200TR uses an R/W SPI interface.
- Is the STW81200TR compatible with different logic levels?
