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參數(shù)資料
| 型號(hào)： | TDA9873HS |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Multistandard dual carrier stereo sound decoder |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, SOT307-2, QFP-44 |
| 文件頁數(shù)： | 15/40頁 |
| 文件大?。?/td> | 197K |
| 代理商： | TDA9873HS |
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2000 Apr 04
15
Philips Semiconductors
Product specification
Multistandard dual carrier stereo sound decoder
TDA9873H
4.
Approximate calculation of the FM-PLL loop filter can be done using the following formula:
with K
O
= VCO steepness
or
K
D
= phase detector steepness
R = loop resistor.
C
S
= series capacitor.
C
P
= parallel capacitor.
B
L(
3dB)
= loop bandwidth for
3 dB.
Example for B
L(
3dB)
= 80 kHz: C
S
= 3.3 nF; C
P
= 680 pF; R = 5.6 k
.
The lower limit of audio bandwidth depends on the value of the capacitors at pins 24 and 26. A value of C
AF
= 470 nF
leads to B
AF(
3dB)
< 20 Hz and a value of C
AF
= 220 nF leads to B
AF(
3dB)
< 40 Hz.
S/N decreases by 4 dB if no second sound carrier is present; auto mute enabled.
Condition for B/G, I and D/K standard: V
CC
= 5 V and
f = 27 kHz (m = 54%).
Condition for M standard: V
CC
= 5 V and
f = 13.5 kHz; 6 dB gain added internally to compensate for smaller
deviation.
R modulated and L monitored. The I
2
C-bus stereo adjustment has to be set to a default value. For B/G, D/K (2) and
M standard the default value is 0 dB, for D/K (1) standard the default value is 0.1 dB and for D/K (3) standard the
default value is 0.2 dB.
Using potentiometer adjustment, the AF output voltage is reduced by 1.3 dB because of the series resistor
(see Fig.8).
Separate alignment for each standard necessary. Minimum value for D/K (3) standard is 37 dB.
10. Because the loop transfer function is not flat, the de-emphasis is superimposed by an amplitude response correction
that compensates for an influence from the FM demodulators.
11. Approximate calculation of the pilot PLL loop filter can be done using the following formulae:
B
L(
3dB)
≈
1.89f
n
K
K
D
×
C
R
2 C
5.
6.
7.
8.
9.
with f
n
= natural frequency of PLL.
K
O
= VCO steepness
or
K
D
= phase detector steepness
R = loop resistor.
C = loop capacitor.
B
L(
3dB)
= loop bandwidth for
3 dB.
= damping factor.
The formulae are only valid under the condition: 0.5
≤ ≤
0.8
Example for B
L(
3dB)
= 544 Hz: C = 100 nF; R = 7.5 k
;
= 0.67; f
n
= 288 Hz.
B
L
3dB
–
(
)
2
π
--1
K
-------------------- 1.55
K
×
C
P
4R
2
K
O
K
D
×
C
P
×
×
-------------------------1
–
=
V
rad
2
π
Hz
V
μ
rad
f
n
2
π
--1
--------------------
=
K
O
×
K
D
×
=
V
rad
2
π
Hz
V
rad
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相關(guān)代理商/技術(shù)參數(shù) |
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| TDA9874A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV sound demodulator/decoder |
| TDA9874AH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV sound demodulator/decoder |
| TDA9874AH/V2,557 | 功能描述:音頻放大器 DIGITAL STEREO DECODER VCR RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA9874AHB | 功能描述:音頻放大器 DIGITAL STEREO DECODER VCR RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TDA9874APS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital TV sound demodulator/decoder |
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