SI2165 Datasheet, PDF (1/2 Pages) Silicon Laboratories – Multi-Standard DVB-T and DVB-C Demodulator

Si2165
Multi-Standard DVB-T and DVB-C Demodulator
Description
The Si2165 is a compact standalone DVB-T/C digital TV
demodulator ideally matching Silicon Labs’ Si2170/1/2 new
hybrid high-performance silicon tuner product family. The analog
front-end consists of two ADCs with wide dynamic range (12-bit)
to allow operation with standard IF (~36 MHz), Low-IF, or Zero-IF
inputs. This enables the use of the Si2165 with any TV tuner,
either metal can or silicon tuner based.
The multi-standard demodulator supports all modes of DVB-T
(EN 300 744), including hierarchical modes. The Si2165 also
supports ITU J.83 annex A/C and DVB-C (EN 300 429),
including a user-configurable 31-tap equalizer. In addition to
DVB-T's legacy modes, the Si2165 also complies with DVB-H
(EN 300 744 Annex F) specificities: 4K FFT, extended TPS,
“native” and “in-depth” deinterleavers. The Si2165 is able to
receive DVB-H programs in fixed receiver applications (without
decoding the additional MPE FEC layer).
An embedded 32-bit DSP controls device operation.
Sophisticated on-chip algorithms ensure optimum reception
even under difficult channel conditions, such as echoes outside
the guard interval, pre-echoes, or strong impulse noise. For
ease-of-use, DSP firmware is preloaded into ROM (device is
immediately active at powerup). Nevertheless, there is a
possibility of downloading additional patch code via the I²C
interface (e.g., to adjust the demodulator to unexpected
conditions or reception impairments).
Thanks to proprietary features, the Si2165 supports ultra-fast
channel scanning for VHF/UHF terrestrial and cable DTV
channels. For supported tuners, the Quickscan algorithm for
blindscan is running onto the embedded DSP (in order to limit the
host CPU load) and is provided as a downloadable patch file.
Serial or parallel master MPEG TS output modes are supported.
Furthermore, a TS slave parallel mode is available via a GPIF port
and provides a glueless interface to Silicon Labs' MCU devices
with embedded USB interface. The user can optionally program a
32-PID hardware filter to reduce the output TS bit rate.
An internal I²C pass-through logic switch acts as an I²C repeater.
This provides a “quiet” I²C bus to the RF front end.
A maximum of six general-purpose inputs/outputs are available;
three GPIOs also feature / and interrupt output capabilities.
Best-in-class demodulation performance is achieved while still
maintaining very low-power operation.
The Si2165 guarantees a low-cost system implementation due to
its minimal BOM and very small package footprint.
Features
- DVB-T (ETSI EN 300 744) demodulator & FEC decoder
- ITU J.83 Annex A/C and DVB-C (EN 300 429) compliant
demodulator & FEC decoder
- NorDig Unified 2.0, D-Book & C-Book 4.0 compliant
- Suitable for low power design: 140 mW (typical, 36 MHz IF
sampling mode)
- Dual 12-bit ADCs: accept 1^st IF, low IF, or zero-IF inputs
- DVB-T channel bandwidth: 5, 6, 7, 8 MHz
- DVB-C symbol rate: 1 to 7.2 MBaud
- DSP-based synchronization and control with embedded ROM
code avoids need for code download at startup
- Supports patch code downloads for in-field upgradeability
- Independent AGC controls (for IF & RF), 
plus RSSI measurement
- ACI filtering: fixed 8 MHz SAW filter even for 7 MHz channel
- Advanced performance for SFN networks
- Impulsive noise protection algorithm
- Ultra fast automatic UHF/VHF band scanning (QuickScan)
- Master TS output modes, parallel or serial
(with tri-state function)
- Slave TS parallel output: external device polls data from an
embedded FIFO, providing a seamless interface to any USB
controller.
- On-chip PID filtering to reduce TS output bit rate.
- Up to six GPIOs
- Two 5 V tolerant I²C control buses (host-side, tuner-side) 
with on-chip I²C repeater
- 4, 16, 20, 24, or 27 MHz clock/crystal reference
- 3.3 and 1.2 V power supplies only
- Very compact QFN-36, 5 x 6 mm, RoHS compliant package
Applications
- Digital terrestrial and cable STB, NIM, and iDTV set
- Personal Video Recorder (DVD or HDD-based)
- Digital terrestrial and cable PC-TV tuner peripheral
1.2, 3.3 V
RESETB
RF_AGC
Dual
IF_AGC _AGC
Si2165
CTRL GPIO
GPIO0..5
RSSI 8-bit
ADC
DSP
TS
I/F
ADC_IP
12-bit
ADC_IN _{ADC Shared}
ADC_QP
12-bit
FRONT ^{DVB-T/C EQUALI}
END ^{DEMOD ZER}
FEC
PID
FILTER
ADC_QN _ADC
4 MHz
TS_SYNC
TS_VAL
TS_ERR
TS_CLK
TS_DATA
8
or
Xtal: 16,20,
24,27 MHz
TUN_SDA
I²C
TUN_SCL _SWITCH
OSC
& PLL
µP
I/F
HOST_SDA
I²C
I/F
HOST_SCL
Digital TV Demodulator
Copyright © 2009 by Silicon Laboratories
8.24.09