Hybrid TV Receiver Copyright © 2011 by Silicon Laboratories 09.06.11
Si2170/1/2
DSP
FILTER
ATV
DEMOD
I
ADC
Q
ADC
0 / 90 LOW-IF
RF_IN
LNA
RF_IP
FREQ
SYNTH
RF
AGC
DC/DC
ANTENNA
INPUT
IF
AGC
VDD_L, VDD_D (1.8 V)
VDD_H, VDD_IO (3.3 V)
VDD_S (3.3 or 5 V)
XOSC
XTAL_I
24 MHz
PGA
PGA
XTAL_O
XOUT
Si2185
Balun
A/V
SoC
DSP
TS_SYNC
TS_VAL
TS_ERR
TS_CLK
TS_DATA
[0..7]
CONTROL
INTERFACE
DIGITAL
I/Q
DIGITAL
FILTER
ATV DEMOD
OUTPUT
INTERFACE
DVB-T/C
DEMOD
EQUAL-
IZER
FEC
CVBS
SIF/AF
RSTB
SDA
SCL
ADDR
GPIO
8
BCLK
INTB
Si2185
Hybrid DVB-T/C and Analog TV Receiver
Description
The Si2185 hybrid TV receiver integrates a complete
hybrid tuner, a DVB-T/C digital demodulator, and an analog
TV demodulator supporting all worldwide analog TV
standards into a single, monolithic, CMOS mixed-signal IC.
Leveraging Silicon Labs' proven 3rd-generation digital
low-IF tuner architecture, the Si2185 delivers superior ATV
picture quality and a higher number of received channels in
real-world crowded spectrum conditions without the need
for external LNAs, tracking filters, or SAW filters.
An enhanced version of the proven DVB-T/C demodulator
technology from Silicon Labs' Si2165 has been
incorporated into the Si2185 to deliver superior
performance under a wide variety of field conditions. Both
the analog and digital demodulators use sophisticated
on-chip algorithms to ensure optimal reception even under
difficult transmission conditions. In addition, the Si2185
offers on-chip Blindscan and Blindlock scanning algorithms
for DVB-C as well as DSP-assisted DVB-T fast channel
scanning.
By combining hybrid tuner and demodulator functions in a
single device, the Si2185 enables a full TV receiver
solution in a very small PCB footprint and with minimal
external components. The Si2185 contains an on-chip
crystal oscillator and only requires the connection of a
standard 24
MHz crystal or a reference clock. For
dual-receiver applications, the primary Si2185 can provide
a reference clock on its XOUT pin directly to the XTAL_I pin
of the secondary Si2185, thus saving the cost of one
crystal. The Si2185 programmable Transport Stream
interface provides both serial and parallel modes and is
fully compatible with all MPEG decoders and conditional
access modules (CI/CI+) to support any customer
application.
Features
- Hybrid Analog and Digital TV tuner
- 42–870 MHz frequency range
- No alignment, tuning or calibration
- Analog TV (ATV) demodulator
- PAL/SECAM, NTSC
- Digital TV (DTV) demodulator and FEC decoder
- DVB-T (ETSI EN 300 744)
- DVB-C (ETSI EN 300 429)
- ITU J.83 Annex A/C
- Supports all DVB-T modes
- Supports DVB-C symbol rates from 1 to 7.2 MBaud
- Advanced echo equalizer
- Best-in-class real-world reception
- Compliance with NorDig 2.1, D-Book, C-Book, EN55020
specifications
- Highly integrated, lowest BOM
- No SAW filters required
- Integrated LNAs and complete tracking filters
- Customizable channel select filters
- Flexible output interface to AV processor
- CVBS + SIF/AF
- Serial or parallel TS output
- Single die in standard CMOS process
- 3.3 and 1.8 V power supplies
- 7x7 mm, 48-pin QFN package, RoHS compliant
Applications
- iDTV (Integrated Digital TV)
- Hybrid PVR and DVD recorder
- Hybrid full-NIM
- Hybrid portable TV
- Hybrid PC-TV card and USB dongle
- Hybrid terrestrial or cable STB
