ST STVVGLNA User Manual
General-purpose, variable-gain, low-noise, RF amplifier
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 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
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