Philips tda9821 DATASHEETS
INTEGRATED CIRCUITS
DATA SH EET
TDA9821
Dual channel TV FM intercarrier
sound demodulator
Product specification
Supersedes data of March 1991
File under Integrated Circuits, IC02
1996 Nov 20
Philips Semiconductors Product specification
Dual channel TV FM intercarrier
TDA9821
sound demodulator
FEATURES
• Two alignment-free PLL FM demodulators
• Automatic second sound carrier mute
• Mono and dual channel application
• Low power consumption
• Few external components required.
QUICK REFERENCE DATA
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
P
I
P
I
M
V
i(rms)
V
o(rms)
SN+
-------------N
α
8/7
supply voltage (pin 14) 4.5 5.0 8.8 V
supply current (pin 14) 23 30 37 mA
AC peak current (pins 7 and 8) −−1.5 mA
input signal (RMS value) − 150 250 µV
output signal (pins 7 and 8; RMS value) ∆fi= ±50 kHz 0.4 0.5 0.6 V
signal plus noise-to-noise ratio
(pins 7 and 8)
crosstalk attenuation f = 50 to 12500 Hz 60 70 − dB
RR supply voltage ripple rejection
(pins 7 and 8)
T
amb
operating ambient temperature 0 − 70 °C
GENERAL DESCRIPTION
The TDA9821 is a monolithic, integrated, TV FM
intercarrier sound demodulator for all FM standards.
The circuit contains two separate FM demodulators using
Phase Locked Loop (PLL) reference frequency
generation. The circuit requires a minimum number of
external components.
SN+
--------------
in accordance with
N
40 dB=
64 68 − dB
“CCIR 468-3”
< 200 mV; f = 70 Hz 16 20 − dB
V
RR
ORDERING INFORMATION
PACKAGE
TYPE NUMBER
NAME DESCRIPTION VERSION
TDA9821 DIP16 plastic dual in-line package; 16 leads (300 mil); long body SOT38-1
1996 Nov 20 2
Philips Semiconductors Product specification
Dual channel TV FM intercarrier
sound demodulator
BLOCK DIAGRAM
handbook, full pagewidth
5.5 MHz (B/G)
1
TDA9821
AMPLIFIER 1
7-STAGE
LIMITER
R
s
VCO 1
TDA9821
(1)
9
V
AF1
8
intercarrier
5.74 MHz (B/G)
15
SUPPLY
V =
P
4.5 to 8.8 V
7-STAGE
LIMITER
AMPLIFIER 2
11121413
VCO
ref
mute
VCO 2
optional stereo
channel separation
adjustment
V
AF2
7
10
MHA424
(1)
R
pot
(1) Resistor and potentiometer between capacitor and earth are inserted if adjustment of stereo channel separation is required.
Fig.1 Block diagram.
1996 Nov 20 3
Philips Semiconductors Product specification
Dual channel TV FM intercarrier
sound demodulator
PINNING
SYMBOL PIN DESCRIPTION
IN
1(B/G)
n.c. 2 not connected
n.c. 3 not connected
n.c. 4 not connected
n.c. 5 not connected
n.c. 6 not connected
V
AF2
V
AF1
C
1
C
2
VCO
ref
C
STAB
GND 13 ground
V
P
IN
2(B/G)
n.c. 16 not connected
1 intercarrier input 1 at 5.5 MHz
7 audio output voltage 2
8 audio output voltage 1
9 decoupling capacitor 1
10 decoupling capacitor 2
11 VCO reference
12 supply voltage stabilization
14 supply voltage
15 intercarrier input 2
handbook, halfpage
IN
1(B/G)
n.c.
n.c.
n.c.
n.c.
n.c.
V
AF2
V
AF1
1
2
3
4
5
6
7
8
TDA9821
MHA531
Fig.2 Pin configuration.
TDA9821
n.c.
16
IN
15
2(B/G)
V
14
P
13
GND
C
12
STAB
VCO
11
ref
C
10
2
C
9
1
FUNCTIONAL DESCRIPTION
The complete circuit consists of two separate channels,
each consisting of a limiter-amplifier, FM demodulator and
AF amplifier. Circuit operation is also described in Fig.1.
FM demodulators
The intercarrier signal is fed through external ceramic
band-pass filters which are tuned to the sound carrier
frequencies.
Each limiter-amplifier is AC-coupled into a
FM demodulator. The integrated FM demodulator PLLs
are alignment-free. The FM demodulator outputs are
amplified to 500 mV (RMS value). High amplification and
DC error signals of the PLLs, which are superimposed on
the FM demodulator outputs, require DC decoupling at
pins 9 and 10 of the AF amplifier inputs.
Stereo channel separation adjustment (optional)
Optimal stereo channel separation is achieved by
adjusting V
1. V
AF1
(pin 8) and V
AF1
(pin 7) as follows:
AF2
by a resistor in series with the DC decoupling
capacitor at pin 9
2. V
by a variable resistor in series with the
AF2
DC decoupling capacitor on pin 10 to the same
voltage as V
AF1
.
Normally stereo channel separation is adjusted in the
stereo decoder for the B/G standard.
1996 Nov 20 4
Philips Semiconductors Product specification
Dual channel TV FM intercarrier
TDA9821
sound demodulator
Second sound carrier mute
The output of the second FM demodulator is muted when
the signal level (signal and/or noise) at pin 15 is less than
typically 0.5 mV (RMS value). This avoids an incorrect
stereo or dual sound identification when a mono signal is
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
V
P
V
i
t
s
supply voltage (pin 14) −0.5 +9.0 V
input signal (pins 1 and 15) −0.5 +5.0 V
short-circuit time (each pin except pins 13 and 14 to
be tested; one at the time)
T
stg
storage temperature
device −25 +125 °C
device in packing −25 +85 °C
T
j
T
amb
V
es
junction temperature − 150 °C
operating ambient temperature 0 70 °C
electrostatic handling for all pins note 1 −500 +500 V
transmitted. Therefore, with a mono transmission, there is
no audio output at pin 7. When the signal level at pin 15 is
greater than typically 1.0 mV (RMS value) mute is
switched off.
− 10 s
note 2 −4000 +4000 V
Notes
1. Equivalent to discharging a 200 pF capacitor via a 0 Ω series resistor.
2. Equivalent to discharging a 100 pF capacitor via a 1.5 kΩ series resistor.
THERMAL CHARACTERISTICS
SYMBOL PARAMETER VALUE UNIT
R
th j-a
thermal resistance from junction to ambient in free air 74 K/W
1996 Nov 20 5
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