SAA5281 Datasheet, PDF (2/48 Pages) NXP Semiconductors – Integrated Video input processor and Teletext decoder IVT1.8

Philips Semiconductors
Integrated Video input processor and
Teletext decoder (IVT1.8*)
Preliminary specification
SAA5281
FEATURES
• Complete Teletext and VPS decoding in a single
package
• Built-in 8K × 8 memory for up to 8 page storage
• Enhanced mode allows 7 Fastext pages and 8 pages of
TOP to be captured
• Ability to request only subtitle pages
• Acquisition and decoding of VPS data
• Data valid output available to indicate reception of
error-free VPS or packet 8/30/2 data
• Software and hardware compatible with SAA5246 and
SAA5248
• Meshing display within boxes
• Separate data checking algorithms and pointers for
each acquisition channel
• 24 : 18 Hamming checker
• Automatic packet 26 extension character processing
• Indication of Line 23 for external use
• 13.5 MHz clock output to drive external microcontroller
• Detection of Spanish transmissions to disable
flicker-stopper
• Compatible with Philips’ one-chip TV IC (TDA836X) for
scan-locking applications.
DESCRIPTION
The IVT1.8* is a single-chip Teletext decoder IC for
decoding 625-line based World System Teletext
transmissions. The device is based on IVT1.0VPS and has
reception facilities for the 5 MHz biphase VPS signal. It is
intended for use in video recorders, in particular to
implement the VPT facility (VCR programming via
Teletext). With suitable software both VPT standards
(EBU PDC System A and System B) can be
accommodated to allow operation from any European VPT
transmission. Automatic processing of packet 26
transmissions is also possible. No external memory is
required as an 8K × 8 DRAM is included on-chip for up to
8 page storage. An enhanced mode allows 7 Fastext
pages to be stored, with one chapter used to store
extension packets.
QUICK REFERENCE DATA
SYMBOL
V_DD
I_DD
V_sync
V_vid(p-p)
f_xtal
T_amb
PARAMETER
supply voltage
supply current
sync voltage amplitude
video input voltage amplitude
(peak-to-peak value)
crystal frequency
operating ambient temperature
MIN.
4.5
−
0.1
0.7
TYP.
5.0
75
0.3
1.0
MAX.
5.5
150
0.6
1.4
UNIT
V
mA
V
V
−
27
−20
−
−
MHz
+70
°C
ORDERING INFORMATION
TYPE NUMBER
SAA5281P
SAA5281ZP
SAA5281GP
NAME
DIP48
SDIP52
QFP64
PACKAGE
DESCRIPTION
plastic shrink dual in-line package; 32 leads (400 mil)
plastic shrink dual in-line package; 52 leads (600 mil)
plastic quad flat package; 64 leads
(lead length 1.95 mm); body 14 × 20 × 2.8 mm
VERSION
SOT240-1
SOT247-1
SOT319-2
1996 Nov 04
2