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參數(shù)資料
| 型號(hào)： | TDA9821 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | dual channel TV FM intercarrier sound demodulator(雙頻道TV FM內(nèi)載波音解調(diào)器) |
| 中文描述： | FM, AUDIO DEMODULATOR, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, MO-001AE, SOT-38-1, DIP-16 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 121K |
| 代理商： | TDA9821 |
1996 Nov 20
4
Philips Semiconductors
Product specification
Dual channel TV FM intercarrier
sound demodulator
TDA9821
PINNING
SYMBOL
PIN
DESCRIPTION
IN
1(B/G)
n.c.
n.c.
n.c.
n.c.
n.c.
V
AF2
V
AF1
C
1
C
2
VCO
ref
C
STAB
GND
V
P
IN
2(B/G)
n.c.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
intercarrier input 1 at 5.5 MHz
not connected
not connected
not connected
not connected
not connected
audio output voltage 2
audio output voltage 1
decoupling capacitor 1
decoupling capacitor 2
VCO reference
supply voltage stabilization
ground
supply voltage
intercarrier input 2
not connected
Fig.2 Pin configuration.
handbook, halfpage
TDA9821
MHA531
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IN1(B/G)
n.c.
n.c.
n.c.
n.c.
VAF2
VAF1
n.c.
n.c.
IN2(B/G)
VP
CSTAB
VCOref
C2
C1
GND
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
AF1
(pin 8) and V
AF2
(pin 7) as follows:
1.
V
AF1
by a resistor in series with the DC decoupling
capacitor at pin 9
2.
V
AF2
by a variable resistor in series with the
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.
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