[DESCRIPTION] This specification covers DBS tuner intended for use in Digital Broadcasting
Satellites. This tuner incorporates "LINK" section that is composed of DVB standard QPSK
demodulation circuit and FEC (Forward Error Correction) circuit. This tuner has 8-bit
transport stream output.
[1] GENERAL SPECIFICATIONS
1-1 Receiving frequency range 950MHz to 2150MHz
1-2 Input level -65dBm to -25dBm
1-3 Input structure F type Female
1-4 Nominal input impedance 75 ohm
1-5 Channel selection system PLL synthesizer(Clock 4.0MHz)
1-6 Step frequency 500kHz
1-7 I/Q output LPF cut off frequency(-3dB)
10MHz to 30MHz, variable (2MHz step)
1-8 Symbol rate 2Msps to 45Msps
1-9 Roll-off Factor 35％ (root-raised cosine)
1-10 LINK IC STV0288 (Clock: 4MHz, Address: D0 (HEX))
1-11 FEC Inner decoder: Viterbi soft decoder, Constraint length M=7
Punctured codes 1/2, 2/3, 3/4, 5/6, 7/8
Automatic or manual rate and Phase recognition
deinterleaver
Word synchro extraction
Convolutive deinterleaver
Outer decoder: Reed-solomon decoder, for 16 parity bytes
Block lengths 204byte
Energy dispersal descrambler
1-12 Absolute maximum ratings (B2) -0.30 to +4.00V DC
(B3) -0.30 to +3.63V DC
(B4) -0.30 to +4.00V DC
(VDD) -0.25 to +2.75V DC
1-13 Operating voltage
LNB voltage (B1A, B1B) 25V, 400mA max
Supply voltage (B2) 3.3V +/- 0.165V DC
(B3) 3.3V +/- 0.165V DC
(B4) 3.3V +/- 0.165V DC
(VDD) 2.5V +/- 0.125V DC
1-14 Circuit block diagram Fig.1
1-15 Connection diagram Fig.2
1-16 Mass 35g
1-17 Storage condition
Temperature 15 deg.C to 35 deg.C
Humidity 25 %RH to 75 %RH
Period 6 months
1-18 Environmental characteristics RoHS compliant
(RoHS refers to the "DIRECTIVE 2002/95/EC OF THE EUROPEAN PARLIAMENT
AND OF THE COUNCIL of 27 January 2003 on the restriction of the use of certain
hazardous substances in electrical and electronic equipment.")
1-19 Attention items:
1) This unit contains components that can be damaged by electro-static
discharge. Before handling this unit, ground your hands, tools, working desks
and equipment to protect the unit from Electronic Static Destroy.
2) Avoid following actions;
a)to store this unit in the place of the high temperature and humidity.
b)to expose this unit to corrosive gases.