Saw Filters; Back End - Hitachi 15LD2200 Service Manual

11
M1,M2,M3,
M4
2.1.2.

SAW Filters

K3953M is an IF Filter for Video Applications. The package is SIP5K. Supported standards are B/G, D/K, I, L/L'.
K9656M is an IF Filter for Audio Applications. The package is SIP5K. Supported standards are B/G, D/K, I, L/L'.

2.2. Back End

The Back End section is handled by PW1306 chip. This IC has built in ADC's for RGB and SOY support. The RGB input
can handle standard interlaced RGB output from UOC, PC VGA RGB input. As only 1 set of ADC is present in PW1306
these sources should be multiplexed.
All the multiplexing operations are controlled by PW1306 via YUV_TV_SW (58) and VGA_TV_SW (57) signals.
The video output from PW1306 is a 48-bit digital RGB bus format and made available on two separate connectors with
TTL control signals (i.e. HS, VS, CLK, etc.). This digital output is intended to interface to TTL compatible display
devices. As PW1306 does not have integrated LVDS transmitter, 24 bit (even part of RGB) video output and TTL control
signals from PW1306 are also inputted to DS90C385 LVDS IC to produce single pixel LVDS output for LVDS
compatible LCDs.
Backlight control is also possible via PW1306 Porta7 pin (PWMOUT, PL176-10), that is a variable duty-cycle pulse
generator output.
TV_[HS,VS]
PC_[HS,VS]
HD_[HS,VS]
YCbCr
[R,G,B]OUT
V[R,G,B]IN
15" TFT TV Service Manual
I.F out 1 Asymmetrical I.F Output / Symmetrical I.F output 1
GND Mounting Tags (Ground)
A: VGA _TV_SW
B: YUV _TV_SW
A B
0 0
0 1
1 0
1 1
Table 2: H/V Sync Multiplexing Table
MUX BLOCK
MUX
74HC4052D
VIDEO
SWITCH
P15V330
Figure 1: MUX Block.
SYNC SOURCE
UOC
VGA
YcbCr
NOT USED
TV_[R,G,B]AIN
VIDEO
SWITCH
P15V330
5 5
AHSYNC
AVSYNC
Control Signals:
VGA_TV_SW
YUV_TV_SW
RGB