參數(shù)資料
型號(hào)： TDA8722T
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： I2C-bus programmable modulator for negative video modulation and FM sound
中文描述： SPECIALTY CONSUMER CIRCUIT, PDSO20
文件頁數(shù)： 17/28頁
文件大?。?/td> 196K
代理商： TDA8722T
1998 Jun 23
17
Philips Semiconductors
Product specification
I
2
C-bus programmable modulator for
negative video modulation and FM sound
TDA8722
Fig.9 Application using a symmetrical output with a balun transformer.
handbook, full pagewidth
220 pF
R1
220 k
C1
C30
10 nF
AUDIO
12 k
R18
82
R19
470
R17
120 k
R15
300
R20
470
RF
75
R2
22 k
15 k
12 k
R5
22 k
R6
12 k
R7
22 k
R9
C3
C5
C6
C8
56 pF
R3
15
μ
H
BB215
D5
33 pF
33 pF
150 nF
L5
10 nF
C7
T8
BC547B
R8
10 nF
C11
Q9
C9
4 MHz
27 pF
33 V
GND
PORT
SCL
SDA
5 V
C20
100 nF
VIDEO
100 nF
C19
15 pF
C17
100 pF
C16
100 pF
C15
MBE404
TR1
2
1
6
4
3
TOKO - B4F
617DB - 1010
L3
20
18
19
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
TDA8722
In the design of the application, it is highly recommended
to separate the part of the RF oscillator as much as
possible from the part of the RF outputs in order to avoid
parasitic coupling between these two parts.
A good solution is shielding the RF oscillator part to avoid
radiation from and to this part. The pin 5 (OGND) must be
connected to the shielding box and to ground.
RF outputs
For inexpensive applications, it is possible to use the IC
with an asymmetrical output (pins 15 or 16). In this event,
the unused output pin must be loaded with a load as
similar as possible to the load connected to the used pin,
see Fig.8.
A good improvement in performance is obtained using a
1 : 4 symmetrical to asymmetrical transformer
(balun; balance-to-unbalance) connected between the
two outputs. In this event both outputs have their loads
matched. The level of the RF second harmonic, and the
spurious outside channel is decreasing. The parasitic
coupling between RF outputs and RF oscillator is also
reduced (see Fig.9).
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