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
ANTENNA
INPUT
Balun
Si2170/1/2
Si2185
RF_IP
RF_IN
LNA
PGA
I
ADC
Q
ADC
DSP
DIGITAL
FILTER
FILTER
ATV
DEMOD
DVB-T/C
DEMOD
ATV DEMOD
OUTPUT
INTERFACE
CVBS
SIF/AF
TS_SYNC
TS_VAL
TS_ERR
TS_CLK
TS_DATA
[0..7]
8
SDA
SCL
INTB
PGA
DIGITAL
I/Q
EQUAL-
IZER
FEC
A/V
SoC
VDD_L, VDD_D (1.8 V)
VDD_H, VDD_IO (3.3 V)
VDD_S (3.3 or 5 V)
RF
AGC
0 / 90
IF
AGC
LOW-IF
DSP
DC/DC
FREQ
SYNTH
XOSC
CONTROL
INTERFACE
XOUT
BCLK
RSTB
ADDR
GPIO
XTAL_I
XTAL_O
24 MHz
Hybrid TV Receiver
Copyright © 2011 by Silicon Laboratories
09.06.11
Si2185
Hybrid DVB-T/C and Analog TV Receiver
Selected Electrical Specifications
(V
DD_H
= 3.3 V, V
DD_L
= 1.8 V, V
DD_D
= 1.8 V, T
A
= 25 °C)
Parameter
Supply Voltage
Total Power Consumption
RF Input Frequency Range
Noise Figure
1
Wideband IIP3
1
Inband IIP3
1
LO Phase Noise at 860 MHz
Adjacent Channel Attenuation
ATV Sensitivity
ATV Unweighted Video SNR
DVB-T Sensitivity
2
DVB-T Carrier to Noise Ratio
2
Max gain
N±18,±36; max RF gain
N±1,±2; max RF gain
125 Hz | 250 Hz | 1 kHz | 10 kHz | 100 kHz
Integrated DSB: 125 Hz to 4 MHz
N±1; RF input
1
to DLIF output
30 dB video SNR; M/N | B/G, D/K | I | L/L’
+1 dBm input level; M/N | B/G, D/K | I | L/L’
8K, 64-QAM, 2/3CR, Gaussian Channel
8K, 64-QAM, 2/3CR, Gaussian Channel
ATV Mode | DVB-T Mode
Test Condition
Typ
1.8 and 3.3
0.98 | 1.1
42 to 870
4.0
+18
–5
–83 | –91 | –96 | –95 | –104
0.4 (–43)
80
–67.5 | –67 | –66 | –68
55.5 | 55 | 53.5 | 56.5
–84
17
Unit
V
W
MHz
dB
dBm
dBm
dBc/Hz
°rms (dBc)
dB
dBm
dB
dBm
dB
Notes:
1.
Measured at the F-connector input of the Si2185 reference design and includes all front-end circuit losses.
2.
Measured at Quasi Error Free conditions (BER = 2 x 10
–4
).
Selection Guide
Part #
Si2185
Description
Hybrid Digital and Analog TV Receiver for DVB-T/C, PAL/SECAM, NTSC
Pin Assignments
LIF_AGC
SIF / AF
VDD_H
VDD_S
VDD_L
ADDR
XOUT
CVBS
LIF_N
BCLK
LIF_P
SCL
7x7 mm QFN-48 Package Information
36
XTAL_O 37
XTAL_I / RCLK 38
VDD_H 39
GND 40
VDD_H 41
GND 42
RF_SHLD 43
RF_IN 44
RF_IP 45
RF_SHLD 46
GND 47
GND 48
1
GND
35
34
33
32
31
30
29
28
27
26
25
24 SDA
23 TS_CLK
22 TS_DATA0 / TS_SER
Si2185
GND_PAD
21 TS_DATA1
20 TS_DATA2
19 VDD_IO
18 GND
17 TS_DATA3
16 TS_DATA4
15 TS_DATA5
14 TS_DATA6
13 TS_DATA7
QFN-48
7x7 mm
2
VDD_H
3
GPIO1
4
INTB
5
RSTB
6
VDD_H
7
GND
8
VDD_IO
9
TS_ERR / GPIO2
10
TS_SYNC
11
TS_VAL
12
VDD_D
Symbol
A
D, E
e
Min
0.80
Nom
Max
Unit
mm
mm
mm
0.85
0.90
7.00 BSC
0.50 BSC
Hybrid TV Receiver
Copyright © 2011 by Silicon Laboratories
09.06.11
Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.
Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.
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