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Philips
Philips

SAA4700 Datasheet

VPS dataline processor


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INTEGRATED CIRCUITS
DATA SHEET
SAA4700
VPS dataline processor
Preliminary specification
File under Integrated Circuits, IC02
March 1991
Page 1

Philips Semiconductors
VPS dataline processor
Preliminary specification
SAA4700
FEATURES
Adaptive sync slicer with buffered
composite sync output VCS
Adaptive data slicer
Data rate clock regenerator
Field selection and line 16
decoding
Startcode and biphase check
Data valid output
Storage of data line information in a
40 bit register bank
I2C-bus transmission
GENERAL DESCRIPTION
The SAA4700 is a bipolar integrated
circuit designed for use in dataline
receivers and incorporates a dataline
slicer and decoder. The slicer extracts
the dataline signal from the video
signal and regenerates the data
clock. It also provides signals for the
decoder in order to decode the binary
data that is transmitted in line 16 of
every first field of the composite video
signal (video programming signal and
video recording programming by
Teletext, VPS and VPT systems).
The decoded information out of words
5 and 11 to 14 is accessed via the
built-in I2C-bus interface. This
information then can be used for
programming a video cassette
recorder in order to start and stop a
recording of a television program at
the correct aligned time, regardless of
a delay or extension in the
transmission time of the required
program.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
VP supply voltage (pins 15 and
16)
IP
Vi CVBS
total supply current
CVBS input signal
sync-to-white
(peak-to-peak value)
Tamb
operating ambient
temperature
MIN. TYP. MAX. UNIT
4.5 5
5.5 V
18 23 mA
0.5 1
0
1.4 V
+70 °C
ORDERING AND PACKAGE INFORMATION
EXTENDED TYPE
NUMBER
SAA4700
PINS
18
PACKAGE
PIN POSITION MATERIAL CODE
DIL plastic SOT102 (1)
Note
1. SOT102-1; 1996 December 4.
March 1991
2
Page 2

Philips Semiconductors
VPS dataline processor
Preliminary specification
SAA4700
handbook, full pagewidth
CVBS
4.7 nF
2
470 pF
CSO
0.1
µF
56
SYNC
SEPARATOR
SAA4700
line 16
1 nF 1
4.7
k
DATA
SLICER
data
(test line 16)
11
FIELD SELECTOR
LINE 16 DECODER
INPUT
CONTROLLER
DAV
12
OUTPUT
CONTROLLER
AD = LOW
7
I2C-BUS
CONTROL
8 SCL
9
SDA
5
8
40-BIT DATA
REGISTER
data
4
40-BIT
DATA LATCH
CLOCK
REGENERATOR
to VP
75 k
(2%)
13
PLL WITH
VCS
4.7 nF
5 MHz VCO AND
17 PHASE DETECTOR
22
nF
14
6 MULTIPLEXER
TIME BASE
REFERENCE
VOLTAGES
POWER-ON RESET
18
external
reset
34
15 16
10
n.c.
8.2 k
clock pulse
Fig.1 Block diagram and test circuit.
0.1 µF
+5 V
VP MEH095
FUNCTIONAL DESCRIPTION
Dataline 16
The information in dataline 16
consists of fifteen 8-bit words; the
total information content is shown in
Table 1; and the organization of
transmitted bytes is shown in Table 2.
Out of the fifteen possible 8-bit words
the SAA4700 extracts words 5 and 11
to 14. The contents of these words
can be read via the built-in I2C-bus
interface. The circuit is fully
transparent, thus each bit is
transferred without modification with
only the sequence of words being
changed. Words 11 to 14
are transmitted first followed by
word 5.
By evaluating the sliced sync signal
the circuit can identify the beginning
of dataline 16 in the first field. The
dataline decoder stage releases the
start code detector. When a correct
start code is detected (for timing of
start code detection see Fig.3) words
5 and 11 to 14 are decoded, checked
for biphase errors and stored in a
register bank. If no biphase error has
occurred, the contents of the register
bank are transferred to a second
register bank by the data valid control
signal. If the system has been
addressed, this transfer will be
delayed until the next start or stop
condition of the I2C-bus has been
received.
The last bit of correct information on
the dataline remains available until it
is read via the I2C-bus. Once the
stored information has been read it is
considered to be no longer valid and
the internal new data flag is reset.
Subsequently, if the circuit is
addressed, the only VPS data that will
be sent back is ”FFF to F”. The same
conditions apply after power-up when
no data can be read out. New data is
available after reception of another
error-free dataline 16.
March 1991
3
Page 3
Part Number SAA4700
Manufactur Philips
Description VPS dataline processor
Total Page 12 Pages
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