ViewSonic N2201w-1M - Page 19

ViewSonic Corporation Confidential - Do Not Copy N2201w-1M
16
Tuner Features:
Receiving System : Designed to cover the air channels including
digital terrestrial channels for ATSC system.
Receiving Channel : 54MHz ~ 863MHz (center freq.)
Intermediate Frequency : Digital(center) : 44 MHz
Analog(P-carrier) : 45.75MHz
Input Impedance : 75Ω, Unbalanced.
IF Output Impedance : 10Ω, Balanced.
Band Change-Over System : PLL system.
Tuning System : PLL system.
Narrow band output to be filtering by a 5.6MHz SAW filter.
Built in the additional IF amplifier with AGC circuit.
Reference Frequency the X-tal the RF block's PLL : 4MHz
Built in DC/DC Converter
PIN CONNECTION
1 RF AGC
2N.C
3 N.C(VT T.P)
4IF+
5IF-
6IFAGC
7 TP(TUNER IF OUT)
8SCL
9SDA
10 GND
11 B+ (5V)
12 N.C
13 AFT
14 SIF OUT
15 VIDEO OUT
SDA SCL
4MHz
B+(5V)
VHF-High
VHF-Low
VT
RF-AGC.
IF-AGC
IF OUT
AGC
DETECTOR
IF
analog
demod
VOAFTSIF
45.75MHz
RF-INPUT
DC/DC
Converter
PLL
SAW-FILTER
SAW-FILTER
44MHz
[ IF AMP-IC ]
[ MOPLL-IC ]
IF 1
IF 2
Block diagram: