TDA8980 Philips Semiconductors, TDA8980 Datasheet - Page 2

• Manufacturer Part Number: TDA8980
• Description: ATSC/NTSC digital TV front-end chipset
• Manufacturer: Philips Semiconductors

COMPLETE REFERENCE DESIGN FOR
HYBRID ATSC/NTSC RECEIVER FRONT-ENDS
This reference design demonstrates a complete solution for building hybrid ATSC/NTSC receiver front-ends for
HDTV sets, STBs and PC/multimedia applications, using just two highly integrated, second generation ICs.
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enables the device to switch between analog
NTSC and digital 8-VSB IF signals.
TDA8980HL ATSC/NTSC TV
INPUT PROCESSOR
Key features
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Integrating many components into a single
chip, the TDA8980HL is designed for both
TV and multimedia applications. Containing
an NTSC-M colour decoder, an IF circuit
and ADCs for audio and video, it can also
generate a ‘mixed down’ I signal for
demodulation of a digital broadcast VSB
input. An I
Direct input to video ADCs
NTSC-M colour decoder tuned with a
12 MHz reference crystal
(or external clock signal)
VSB IF circuit for pre-processing
DTV signals
Alignment-free PLL demodulator Vision
IF circuit without external components
Sound IF amplifier with separate input
for single reference QSS mode and
separate AGC circuit
Alignment-free FM sound demodulator
generates the input signal for a BTSC
stereo decoder
Video source selection with 2 external
CVBS or Y/C inputs and an
independently switchable output
Two 10-bit video ADCs for converting
selected YUV signals (video mode)
or downconverted I&Q signals
(VSB mode)
Two 16-bit audio A/D converters and
I
Up to four stereo analog inputs and
one I
ITU656 or VSB formatter
2
S formatter
2
S input
2
C-bus controlled internal switch
When decoding NTSC, the chip digitizes the audio signals into an
I
information into an ITU656 stream via the on-chip video ADCs.
An incoming 6 MHz wide 8-VSB IF signal is downconverted to a low
IF, centred at 4 MHz, which is digitized using an on-chip 10-bit ADC
and gluelessly interfaced to the VSB demodulator for further
processing. In a typical application, the TDA8980 handles AGC,
eliminating the need for external components such as an op-amp loop
integrator.
It has an internal 2-D adaptive comb filter for NTSC, and a YUV
interface allows simple connection of additional picture enhancement
ICs such as a 3-D comb filter. For sound decoding, external
devices - a BTSC sounder decoder, for example - can be connected.
TDA8961 DTV DEMODULATOR/DECODER
General features
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2
5 V
I
I
2
2
C
S stream using on-chip audio stereo 16-bit ADCs, and the video
C
Errror
InRange_1
Tuner_Lock
FE_Lock
EQ_Lock
FSHNDSHK
FPGA_1
FPGA_2
FPGA_3
audio in
I
CD in
stereo
2
C
One-chip ATSC-compliant demodulator and concatenated
Trellis (Viterbi)/Reed-Solomon decoder with de-interleaver
and de-randomizer
Parallel (8-bit) or serial MPEG2 transport stream output
On-board I
MPEG2 serial transport stream input
TUNER
DECODER
AUDIO
TDA9851
MUX
BTSC
5 V 12 V
power
tuner
AGC
2
C-bus interface
EEPROM &
CONTROL
I
2
AUDIO
C
MIX
PCF9851
I
2
C ADC
4.5 MHz
TRAP
CD out
TDA8980
(w/socket)
comp.
video
I
2
in S-video
V CC
S out
reset
S/PDIF in
2
in
I
2
RGBS/YUVS
TDA1315
S in
PCI connector
3
SAA7146
in
3
12
12 MHz
MPOC output
8
8
IF AGC
I
2
S out
FIFO
FIFO
6
12 MHz
serial TS
input
11
11
TS in
9
3 V
I
2
C
TDA8961
(w/socket)
V CC
4
9
FPGA
JTAG
diag
reset
5
serial TS
status
output
9
6
TS
TS
control
status
bus
L3
30
diag
reset
I
out
MSD051
2
parallel
S
output