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參數(shù)資料
| 型號： | TDA9615H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Audio processor for VHS hi-fi(應用于VHS高保真的音頻處理器) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 X 1.75 MM, PLASTIC, SOT-307-2, QFP-44 |
| 文件頁數(shù)： | 35/44頁 |
| 文件大小： | 263K |
| 代理商： | TDA9615H |
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1997 Jun 16
35
Philips Semiconductors
Preliminary specification
Audio processor for VHS hi-fi
TDA9615H
Do not set MUTE and change STBP at the same time;
to avoid output glitches power muting should precede the
switching of ‘passive standby’ mode. Power muting takes
up approximately 4 mA supply current, so to realize the
minimum power consumption of ‘passive standby’ mode
muting has to be deactivated. Note also the use of ‘passive
standby’ mode to initiate a controlled power-off switching.
I
ref
resistor
The external resistor at pin 28 defines internal reference
currents and determines temperature stability of the
circuits adjusted by the auto-calibration function.
The external resistor should have the following
dimensions: value = 39.0 k
±
2%; temperature
coefficient =
±
50 ppm/K.
Standard hi-fi audio level
Using the application circuit as proposed in Fig.6, the
standard FM deviation of 50 kHz equals a 1 kHz audio
signal of
8 dBV line output level (LOH = 0). A different
standard audio level can be selected by changing the
external filter components of the noise reduction at
pins 24 and 32 (EMPHL and EMPHR); standard audio
level changes proportional to the impedance of the
external de-emphasis filter; see Table 36.
Table 36
Standard audio levels; see application diagram of Fig.6
COMPONENT VALUES
LINE OUTPUT LEVEL FOR 50 kHz FM DEVIATION
(EQUIVALENT TO 1 kHz AUDIO SIGNAL) (dBV)
R1 (k
)
91
82
75
68
62
56
51
R2 (k
)
7.5
6.8
6.2
5.6
5.1
4.7
4.3
C1 (nF)
2.4
2.7
3.0
3.3
3.6
3.9
4.3
5.6
6.4
7.1
8.0
8.8
9.8
10.6
RFC AGC;
see Fig.13
To avoid over modulation in the RF converter unit connected to RFCOUT (pin 12) an AGC function is incorporated,
limiting the maximum signal level at pin RFCOUT to
3 dBV.
Fig.13 RF converter output AGC.
handbook, halfpage
MGK479
(dBV)
3
3
line output (dBV)
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