STVVGLNA STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 4
Technical content
Features
■ 75-Ω single-ended input impedance ■ 75-Ω single-ended or 150-Ω differential output impedance ■ Dual differential or single-ended outputs ■ Single 3.3-V DC supply ■ Input frequency range 50 to 2150 MHz ■ Fully integrated RF AGC with power monitoring ■ Low external component count ■ Low power consumption (145 mW typical) ■ Temperature range -35 °C to 85 °C ■ Compatible with 5-V and 3.3-V I2C bus ■ I2C bus control (option) ■ Four selectable I2C addresses C8,CA,CC,CE
Applications
■ Satellite set-top boxes ■ SMATV RF accessories ■ LNBs ■ DVB-T active indoor antennas Package ■ VFQFPN-16L 3x3x0.85 mm3 with exposed pad down (EPD) ■ Environmentally friendly packaging, RoHS (2002/95/EC) compliant.
Description
The STVVGLNA is a general-purpose, low-noise amplifier with a gain range of -17 dB to +15 dB. Its gain is regulated either autonomously by an integrated AGC loop or by software control. It can be used, for example, as an input amplifier for a satellite set-top box. Figure 1. STVVGLNA block diagram
1 Introduction
The STVVGLNA is a front-stage amplifier designed for set-top boxes. It has high input power dynamic range to allow the optimization of sensitivity and linearity requirements. The STVVGLNA has several operating modes suitable for different signal conditions:
- automatic wide-band mode, internal AGC (the default mode)
- semi-automatic wide-band mode, internal AGC
- fixed gain mode, no AGC
- variable gain with external AGC (driven by demodulator, for example) The mode of operation is programmable via the I2C bus. The STVVGLNA also provides a RF-signal-level indication which may be interrogated via the I2C bus. This is useful for installation and status information. At power-on, the STVVGLNA starts in automatic and autonomous AGC mode so that it can operate in satellite set-top boxes, LNBs or SMATV accessories without any software assistance. Features Benefits Active amplitude compensation and balanced/differential operation. Simplified RF layout and increased robustness to interference. Four AGC/Gain programmable operating modes. Flexible AGC strategy. Programmable via I2C bus. The device can be µP controlled. Wide range of input frequencies. Applications range from satellite receivers down to VHF antenna amplifiers. Low component count plus tiny package with exposed pad. Small BOM and minimal use of PCB area. Pre programmed automatic wide-band internal AGC mode. No micro processor is required if the STVVGLNA is to be used in default mode.
2 Ordering information
3 Revision history
Table 1. Device summary Table 2. Document revision history 01-Jun-2011 1 Initial release.