ST STVVGLNA User Manual

General-purpose, variable-gain, low-noise, RF amplifier
Features
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 I
2
I
C bus control (option)
Four selectable I
2
C addresses C8,CA,CC,CE
Applications
Satellite set-top boxes
SMATV RF accessories
LNBs
DVB-T active indoor antennas
2
C bus
STVVGLNA
for broadcast receiver applications
Data brief
Package
VFQFPN-16L 3x3x0.85 mm
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.
3
with exposed pad

Figure 1. STVVGLNA block diagram

STVVGLNA
TV1
tuner
DVR
tuner
AGC loop
2
C
I
SCL SDAVAGCI VAGCO
June 2011 Doc ID 018892 Rev 1 1/4
For further information contact your local STMicroelectronics sales office.
F
www.st.com
4
Introduction STVVGLNA

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 I The STVVGLNA also provides a RF-signal-level indication which may be interrogated via
2
the I
C 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
2
C bus.
Active amplitude compensation and balanced/differential operation.
Four AGC/Gain programmable operating modes.
Programmable via I2C bus. The device can be µP controlled. Wide range of input frequencies. Applications range from satellite receivers down to
Low component count plus tiny package with exposed pad.
Pre programmed
internal AGC
automatic wide-band
mode.
Simplified RF layout and increased robustness to interference.
Flexible AGC strategy.
VHF antenna amplifiers.
Small BOM and minimal use of PCB area.
No micro processo r is required if the STVVG LNA is to be used in default mode.
2/4 Doc ID 018892 Rev 1
STVVGLNA Ordering information

2 Ordering information

T a ble 1. Device summary

Order code Temperature range Package Packaging
STVVGLNA -35 to 85 °C VFQFPN-16L EPD Tray STVVGLNAT -35 to 85 °C VFQFPN-16L EPD Reel

3 Revision history

Table 2. Document revision history

Date Revision Changes
01-Jun-2011 1 Initial release.
Doc ID 018892 Rev 1 3/4
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4/4 Doc ID 018892 Rev 1
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