SI2110-D-FMR Silicon Laboratories Inc, SI2110-D-FMR Datasheet - Page 19

• Manufacturer Part Number: SI2110-D-FMR
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2110-D-FMR

• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Supplier Unconfirmed

4. Part Versions
There are four pin- and software-compatible versions of
this device. All versions include the L-band tuner, DVB-
S/DSS demodulator and channel decoder, and LNB
signaling controller. Furthermore, the Si2108 and
Si2110 integrate an efficient LNB supply regulator while
allowing operation with an external LNB supply
regulator circuit. The LNB supply controller utilizes a
step-up converter architecture. In case operation with
an external regulator is desired, Si2107 and Si2109 can
be used; these do not integrate the LNB step-up dc-dc
controller.
On the other hand, the Si2109 and Si2110 integrate an
on-chip “blindscan” accelerator, QuickScan, which
allows the implementation of a very fast channel scan,
an important feature for end products targeted to free-
to-air (FTA) applications in which channel frequencies
and symbol rates are unknown. Si2107 and Si2108 do
not integrate this accelerator and are a good fit when
symbol rates and frequencies of satellite channels are
known, as in the case of pay-TV receivers or for FTA
receivers in which the embedded firmware contains the
channel tuning information. Table 13 summarizes the
differences between part versions.
Number
Si2110
Si2109
Si2108
Si2107
Part
Demodulator with
Integrated Tuner/
Integrated LNB
Table 13. Device Versions
DVB-S/DSS
Messaging
Y
Y
Y
Y
LNB Supply
Regulator
Y
N
Y
N
QuickScan
Y
Y
N
N
Rev. 1.0
5. Functional Description
The Si2107/08/09/10 is a family of highly-integrated
CMOS RF satellite receivers for DVB-S and DSS
applications. The device is an ideal solution for satellite
set-top boxes, digital video recorders, digital televisions,
and satellite PC-TV. The IC incorporates a tuner,
demodulator, and LNB controller into a single device
resulting in a significant reduction in board space and
external component count. The device supports symbol
rates of 1 to 45 Mbaud over a 950 to 2150 MHz range.
A full suite of features including automatic acquisition,
fade recovery, blind scanning, performance monitoring,
and DiSEqC™ Level 2.2 compliant signaling are
supported. The Si2110 and Si2108 further add short-
circuit protection, overcurrent protection, and a step-up
dc-dc controller to implement a low-cost LNB supply.
Furthermore, the Si2109 and Si2110 have an on-chip
blindscan accelerator. An I
configure and monitor all internal parameters.
5.1. Tuner
The tuner is designed to accept RF signals within a 950
to 2150 MHz frequency range. The tuner block consists
of
attenuators,
downconverters, and anti-aliasing filters. The LNA and
variable gain stages provide balance between the noise
figure and linearity characteristics of the system. When
all gain stages are combined, the device provides more
than 80 dB of gain range. The desired tuning frequency
can be adjusted in intervals of 12.2 kHz, without the aid
of external varactors, using a unique two-stage tuning
algorithm that is supplied with the software driver. The
rapid settling time of the local oscillator improves
channel acquisition and switching performance. The
PLL loop filter has been completely integrated into the
device resulting in low tuner phase noise, improved
spurious response, and reduced BOM cost. An external
20 MHz crystal unit generates the reference frequency
for the system.
a
low-noise
a
Si2107/08/09/10
amplifier
local
2
C bus interface is used to
oscillator,
(LNA),
variable
quadrature
gain
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