RXD-V252/V252-H
6
CIRCUIT DESCRIPTION
Port No.
Port Name
I/O
Function
52
VREF
I
Internal resistor divider generators common mode reference(CMR) voltage.
53
VREFM
I
DAC and ADC minimum reference.
54
RSET
I
Full scale DAC current adjustment.
55
COMP
I
Compensation pin.
56,57,62,63
VGND
I
Video analog ground.
58
CDAC
O
Modulated chrominance output.
59,60
VVDD
I
Video VCC(5V).
61
YDAC
O
Y luminance data bus for screen video port.
64
VDAC
O
Composite video output.
65
ACAP
I
Audio CAP.
71
XOUT
O
Crystal output.
74
XIN
I
27MHz crystal input.
79
PCLK
I/O
13.5MHz pixel clock.
80
2XPCLK
I/O
27MHz (2 times pixel clock).
82
HSYN B
O
Horizontal sync (active low).
84
VSYN B
O
Vertical sync (active low).
86~89,92
94,96,98
YUV(7~0)
I
YUV data bus for screen video port.
Block Diagram for DAC & TV Encoder : ES3889 (ICM3)
Visba ES3889
Companion Chip
CD-ROM Controller
CD-ROM
Remote Interrupt
Remote
Kit
Control Control
Receiver
Visba ES3880
Audio DAC
Speakers
(Video CD)
DSC
ROM
PLL
NTSC/PAL Video
Television
Echo/Surround/Vocal Assist
Mic 1
Pre amp
DRAM
Volume Control
VFD
VFD
Mic 2
Pre amp
Driver
Panel
Volume Control
