TDA8417.PDF

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INTEGRATED CIRCUITS
DATA SHEET
TDA8417
TV and VTR stereo/dual sound
processor with integrated filters and
I 2 C-bus control
Preliminary specification
File under Integrated Circuits, IC02
September 1989
11039379.006.png
Philips Semiconductors
Preliminary specification
TV and VTR stereo/dual sound processor with
integrated filters and I 2 C-bus control
TDA8417
GENERAL DESCRIPTION
R)/2” or “language A” on one channel and “R” or
“language B” on the second channel (where L = left and
R = right). The carrier frequency of the second channel is
also modulated by an identification signal (stereo or dual
sound). The device is controlled by a microcomputer via
the two-line, bidirectional I 2 C-bus.
Features
·
Use of the switched-capacitor technique for signal
processing
·
Small amount of peripheral components
·
Integrated anti-aliasing filters
·
Low distortion AF signal handling
·
Integrated de-emphasis with a time constant of 50
m
s
·
Two general purpose output ports
·
Full ESD protection
QUICK REFERENCE DATA
PARAMETER
CONDITION
SYMBOL
MIN.
TYP.
MAX.
UNIT
Supply voltage (pin 15)
V P
-
12
-
V
Supply current (pin 15)
I P
-
10
-
mA
AF output signal (RMS value)
(pins 11 to 14)
V o
-
2
-
V
Weighted signal-to-noise
ratio of the AF output
signals (CCIR 468/3)
(S + W)/W
70
-
-
dB
Crosstalk attenuation
stereo mode at
f = 1 kHz
a S
40
-
-
dB
dual sound mode at
f = 40 Hz to 12.5 kHz
a DS
70
-
-
dB
Pilot signal input sensitivity
V i
-
2.5
-
mV
Total harmonic distortion
THD
-
0.1
-
%
PACKAGE OUTLINE
20-lead DIL; plastic (SOT146); SOT146-1; 1996 November 18
September 1989
2
The TDA8417 is a processor of stereo/dual language
signals (B/G-standard) for stereo sound television
receivers and VTRs, using the switched-capacitor
technique. The AF signals at the TDA8417 inputs must be
“(L
+
11039379.007.png 11039379.008.png 11039379.009.png 11039379.001.png 11039379.002.png
Philips Semiconductors
Preliminary specification
TV and VTR stereo/dual sound processor
with integrated filters and I 2 C-bus control
TDA8417
September 1989
3
11039379.003.png
Philips Semiconductors
Preliminary specification
TV and VTR stereo/dual sound processor
with integrated filters and I 2 C-bus control
TDA8417
Fig.2 Input and output loading diagram.
September 1989
4
11039379.004.png
Philips Semiconductors
Preliminary specification
TV and VTR stereo/dual sound processor
with integrated filters and I 2 C-bus control
TDA8417
PINNING
1
Control port C1
2
SDA, serial data line (I 2 C-bus)
3
SCL, serial clock line (I 2 C-bus)
4
Oscillator input (or quartz)
5
Digital ground (0 V)
6
Not connected, but reserved
7
Sound channel input AF2 (E2)
8
Sound channel input AF1 (E1)
9
External AF input (E4)
10
Not connected, but reserved
11
Output A4 AF 2 output
12
Output A3 AF 2 output
13
Output A2 AF 1 output
14
Output A1 AF 1 output
15
Supply voltage V P
16
Analogue ground (0 V)
17
Ripple rejection improvement
18
Mute input
19
Control port C2
20
Not connected, but reserved
FUNCTIONAL DESCRIPTION
Anti-aliasing filters
Frequency band limitation is performed by a second order Sallen and Key low-pass filter inserted in the AF signal path
and the identification circuit. This limitation is necessary because of the time-discrete signal processing needed to meet
the Nyquist criterium.
Identification
To enable the identification of the transmitted AF signal (mono, stereo or dual sound), the carrier frequency of the second
channel (E2) is also modulated by an identification signal. The identification signal is a 54.6875 kHz pilot carrier signal
which is 50% amplitude modulated by either a 117.4 Hz signal for stereo transmission or by a 274.1 Hz signal for dual
sound transmission.
The identification section of the circuit consists of a 54 kHz high-pass filter followed by a gain controlled amplifier with an
AM demodulator. The total gain of the high-pass filter and the amplifier is approximately 56 dB. The demodulated
identification signal is filtered by the identification band-pass filters, (117.4 Hz for stereo transmission, 274.1 Hz for dual
sound transmission). The output from either filter is converted to a DC signal by a peak detector and the necessary
hysteresis is performed by a Schmitt-trigger. The resultant DC output signals indicate the status of the transmitter (mono,
stereo or dual sound).
September 1989
5
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