Overview
The STW81200T, produced by STMicroelectronics, is a dual architecture frequency synthesizer that combines both Fractional-N and Integer-N architectures. This component features three low phase-noise Voltage-Controlled Oscillators (VCOs) with a fundamental frequency range of 3.0 GHz to 6.0 GHz. It includes a programmable dual RF output divider stage, allowing frequency coverage from 46.875 MHz to 6 GHz. The STW81200T is designed to optimize the size and cost of the final application by integrating low-noise LDO voltage regulators and internally-matched broadband RF outputs. It operates with a wide range of supply voltages (from 3.0 V to 5.4 V), offering high flexibility and excellent performance while managing power dissipation. The device also includes a low-power functional mode for additional power savings.
Key Specifications
| Specification | Value |
|---|---|
| Output Frequency Range | 46.875 MHz to 6000 MHz |
| 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 |
| Maximum Phase Detector Frequency | 100 MHz |
| Supply Voltage | 3.0 V to 5.4 V |
| Package | VFQFPN36 (6 x 6 x 1.0 mm) |
| Process | BICMOS 0.25 μm SiGe |
| Operating Temperature Range | -40°C to 85°C |
Key Features
- Dual architecture frequency synthesizer: Fractional-N and Integer-N
- Integrated VCOs with automatic center frequency calibration
- Programmable RF output dividers by 1/2/4/8/16/32/64
- 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
- Exact frequency mode and fast lock and cycle slip reduction
- Differential reference clock input (LVDS and LVECPL compliant) supporting up to 800 MHz
- 13-bit programmable reference frequency divider
- Programmable charge pump current and digital lock detector
- Integrated reference crystal oscillator core and R/W SPI interface
- Logic compatibility/tolerance 1.8 V/3.3 V and 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 STW81200T?
The output frequency range is from 46.875 MHz to 6000 MHz.
- What are the key noise specifications of the STW81200T?
The normalized in-band phase noise floor is -227 dBc/Hz, VCO phase noise is -135 dBc/Hz @ 1 MHz offset at a 4.0 GHz carrier, and the noise floor is -160 dBc/Hz.
- What is the maximum phase detector frequency of the STW81200T?
The maximum phase detector frequency is 100 MHz.
- What is the supply voltage range for the STW81200T?
The supply voltage range is from 3.0 V to 5.4 V.
- What package type is the STW81200T available in?
The STW81200T is available in a VFQFPN36 package (6 x 6 x 1.0 mm).
- What are the operating temperature ranges for the STW81200T?
The operating temperature range is from -40°C to 85°C.
- Does the STW81200T support external VCO mode?
- What interface does the STW81200T use for programming?
The STW81200T uses an R/W SPI interface for programming.
- Does the STW81200T have a low power mode?
- What are some of the key applications of the STW81200T?
The key applications include cellular/4G infrastructure equipment, instrumentation and test equipment, cable TV, and other wireless communication systems.
