Overview
The STW81101AT from STMicroelectronics is a multi-band RF frequency synthesizer integrated with voltage-controlled oscillators (VCOs). This device is designed to offer high performance, high integration, low power consumption, and multi-band capabilities, making it a cost-effective alternative to discrete PLL and VCO solutions. The STW81101AT features an integer-N frequency synthesizer and two fully integrated VCOs, which provide low phase-noise performance and a noise floor of -155 dBc/Hz. The device is fabricated using STMicroelectronics' advanced 0.35 µm SiGe process, ensuring robust and reliable operation across various frequency bands.
Key Specifications
| Parameter | Value |
|---|---|
| Frequency Range | 3300 - 3900 MHz (direct output), 3800 - 4400 MHz (direct output), 1650 - 1950 MHz (internal divider by 2), 1900 - 2200 MHz (internal divider by 2), 825 - 975 MHz (internal divider by 4), 950 - 1100 MHz (internal divider by 4) |
| Phase Noise | -155 dBc/Hz |
| Lock Time | 150 µs |
| Prescaler | Dual modulus programmable prescaler (16/17 or 19/20) |
| Feedback Division Ratio | 256 to 65551 (prescaler 16/17), 361 to 77836 (prescaler 19/20) |
| Reference Frequency Divider | Programmable (10 bits) |
| Power Supply | 3.3 V |
| Package | VFQFPN28, 5 x 5 x 1.0 mm |
| Process | 0.35 µm SiGe BICMOS |
| Interface | Dual digital bus: SPI and I2C |
Key Features
- Integer-N frequency synthesizer
- Dual differential integrated VCOs with automatic center frequency calibration
- Excellent integrated phase noise performance
- Fast lock time of 150 µs
- Dual modulus programmable prescaler (16/17 or 19/20)
- Programmable reference frequency divider (10 bits)
- Phase frequency comparator and charge pump
- Programmable charge pump current
- Digital lock detector
- Dual digital bus interface: SPI and I2C bus with 3-bit programmable address
- Power down mode (hardware and software)
- Small size exposed pad VFQFPN28 package (5 x 5 x 1.0 mm)
Applications
- 2.5G and 3G cellular infrastructure equipment
- CATV equipment
- Instrumentation and test equipment
- Other wireless communication systems
Q & A
- What is the STW81101AT? The STW81101AT is a multi-band RF frequency synthesizer with integrated VCOs from STMicroelectronics.
- What are the frequency ranges supported by the STW81101AT? The device supports frequency ranges of 3300 - 3900 MHz, 3800 - 4400 MHz, 1650 - 1950 MHz, 1900 - 2200 MHz, 825 - 975 MHz, and 950 - 1100 MHz.
- What is the phase noise performance of the STW81101AT? The phase noise performance is -155 dBc/Hz.
- How long does it take for the STW81101AT to lock onto a frequency? The lock time is 150 µs.
- What types of prescalers are available on the STW81101AT? The device features dual modulus programmable prescalers (16/17 or 19/20).
- What is the power supply voltage for the STW81101AT? The power supply voltage is 3.3 V.
- What package type is the STW81101AT available in? The device is available in a VFQFPN28 package, measuring 5 x 5 x 1.0 mm.
- What process technology is used to fabricate the STW81101AT? The device is fabricated using 0.35 µm SiGe BICMOS technology.
- What digital interfaces does the STW81101AT support? The device supports both SPI and I2C digital bus interfaces.
- What are some common applications of the STW81101AT? Common applications include 2.5G and 3G cellular infrastructure equipment, CATV equipment, instrumentation and test equipment, and other wireless communication systems.
