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Электронный компонент: TDA8395T/N2

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DATA SHEET
Preliminary specification
File under Integrated Circuits, IC02
October 1991
INTEGRATED CIRCUITS
TDA8395
SECAM decoder
October 1991
2
Philips Semiconductors
Preliminary specification
SECAM decoder
TDA8395
FEATURES
Fully integrated filters
Alignment free
For use with baseband delay
GENERAL DESCRIPTION
The TDA8395 is a self-calibrating, fully integrated SECAM decoder. The IC should preferably be used in conjunction with
the PAL/NTSC decoder TDA8362 or TDA8366 and with the switched capacitor baseband delay circuit TDA4660. The IC
incorporates HF and LF filters, a demodulator and an identification circuit (luminance is not processed in this IC). The IC
needs no adjustments and very few external components are required. A highly stable reference frequency is required
for calibration and a two-level sandcastle pulse for blanking and burst gating.
QUICK REFERENCE DATA
ORDERING INFORMATION
Note
1. SOT38-1; 1996 December 3.
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
V
P
positive supply voltage; pin 3
7.2
-
8.8
V
P
tot
total power dissipation
-
-
220
mW
V
16(p-p)
composite video input voltage
(peak-to-peak value); pin 16
-
1.0
1.5
V
V
O(p-p)
-
(R
-
Y) output voltage amplitude
(peak-to-peak value); pin 9
-
1.05
-
V
V
O(p-p)
-
(B
-
Y) output voltage amplitude
(peak-to-peak value); pin 10
-
1.33
-
V
EXTENDED TYPE NUMBER
PACKAGE
PINS
PIN POSITION
MATERIAL
CODE
TDA8395
16
DIL
plastic
SOT38GE1
(1)
October 1991
3
Philips Semiconductors
Preliminary specification
SECAM decoder
TDA8395
Fig.1 Block diagram.
Fig.2 Pin configuration
PINNING
SYMBOL
PIN
DESCRIPTION
f
ref/
IDENT
1
reference frequency
input/identification input
TEST
2
test output
V
P
3
positive supply voltage
n.c.
4
not connected
n.c.
5
not connected
GND
6
ground
CLOCHE
ref
7
Cloche reference filter
PLL
ref
8
PLL reference
-
(R
-
Y)
9
-
(R
-
Y) output
-
(B
-
Y)
10
-
(B
-
Y) output
n.c.
11
not connected
n.c.
12
not connected
n.c.
13
not connected
n.c.
14
not connected
SAND
15
sandcastle pulse input
CVBS
16
video (chrominance) input
October 1991
4
Philips Semiconductors
Preliminary specification
SECAM decoder
TDA8395
FUNCTIONAL DESCRIPTION
The TDA8395 is a self-calibrating SECAM decoder
designed for use with a baseband delay circuit.
During frame retrace a 4.433619 MHz reference frequency
is used to calibrate the filters and the demodulator. The
reference frequency should be very stable during this
period.
The Cloche filter is a gyrator-capacitor type filter the
resonance frequency of which is controlled during the
calibration period and offset during scan; this ensures the
correct frequency during calibration.
The demodulator is a Phase-Locked Loop (PLL) type
demodulator which uses the frequency reference and the
bandgap reference to force the PLL to the required
demodulation characteristic.
The low frequency de-emphasis is matched to the PLL and
is controlled by the tuning voltage of the PLL.
A digital identification circuit scans the incoming signal for
SECAM (only line-identification is implemented). The
identification circuit needs to communicate with the
TDA8362 to guarantee that the output signal from the
decoder is only available when no PAL signal has been
identified. If a SECAM signal is decoded a request for
colour-on is transmitted to pin 1 (current is sunk). If the
signal request is granted (i.e. pin 1 is HIGH therefore no
PAL) the colour difference outputs (
-
(B
-
Y) and
-
(R
-
Y))
from the TDA8362 are high impedance and the output
signals from the TDA8395 are switched ON.
If no SECAM signal is decoded during a two-frame period
the demodulator will be initialized before another attempt
is made also during a two-frame period. The CD outputs
will be blanked or high-impedance depending on the logic
level at pin 1.
A two-level sandcastle pulse generates the required
blanking periods and, also, clocks the digital identification
pulse on the falling edge of the burst gate pulse. To enable
the calibration period to be defined the vertical retrace is
discriminated from the horizontal retrace, this is achieved
by measuring the width of the blanking period.
LIMITING VALUES
In accordance with the Absolute Maximum System (IEC 134)
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
V
P
positive supply voltage
-
8.8
V
T
stg
storage temperature range
-
25
+150
C
T
amb
operating ambient temperature range
-
25
+70
C
October 1991
5
Philips Semiconductors
Preliminary specification
SECAM decoder
TDA8395
CHARACTERISTICS
V
P
= 8.0 V; T
amb
= 25
C; unless otherwise specified
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Supply (pin 3)
V
P
positive supply voltage
7.2
8.0
8.8
V
I
P
supply current
-
18
25
mA
P
tot
total power dissipation
-
144
220
mW
CVBS input (pin 16)
V
16(p-p)
composite video input voltage
(peak-to-peak value)
-
1.0
1.5
V
V
16(p-p)
chrominance input voltage
(peak-to-peak value)
note 1
15
-
300
mV
Z
I
input impedance
note 2
-
15
-
k
CLOCHE (pin 7)
V
tc
tuning voltage
2.5
3.5
4.5
V
f
0
resonance frequency
note 3
4.266
4.286
4.306
MHz
B
bandwidth
241
268
295
kHz
Demodulator
V
td
tuning voltage; pin 8
3.5
-
4.8
V
V
O(p-p)
output voltage amplitude
(peak-to-peak value); pin 9
100/75 colour bar
0.97
1.05
1.13
V
V
O(p-p)
output voltage amplitude
(peak-to-peak value); pin 10
100/75 colour bar
1.23
1.33
1.43
V
NLE
non-linearity error
100/75 colour bar;
note 4
-
-
3
%
-
(B
-
Y)/
-
(R
-
Y)
ratio of
-
(B
-
Y) and
-
(R
-
Y)
1.23
1.27
1.32
f
be
-
(R
-
Y)
black-level error
-
(R
-
Y)
note 5
-
-
5
kHz
f
be
-
(B
-
Y)
black-level error
-
(B
-
Y)
note 5
-
-
7
kHz
V
O
output voltage level during
blanking
-
2.8
-
V
B
O
output bandwidth
-
1.3
-
MHz
S/N
signal-to-noise ratio
note 6
40
-
-
dB
f
p
pole-frequency LF
de-emphasis
77
85
93
kHz
f
p
/f
0
ratio of pole and zero
frequency
-
3
-
V
rh(p-p)
residual harmonic voltage
(peak-to-peak value)
-
-
10
mV
Z
O(e)
output impedance SECAM
enabled
pin 1 HIGH
-
-
600
Z
O(d)
output impedance SECAM
disabled
pin 1 LOW
1
-
-
M