參數(shù)資料
型號(hào)： TDA9615
廠商： NXP Semiconductors N.V.
英文描述： DIODE,TVS,BI,20V,1500W,J-LEAD
中文描述： 音頻處理器錄影帶高保真
文件頁(yè)數(shù)： 34/44頁(yè)
文件大小： 263K
代理商： TDA9615
1997 Jun 16
34
Philips Semiconductors
Preliminary specification
Audio processor for VHS hi-fi
TDA9615H
Power mute;
see Fig.12
Without countermeasures switching of the power supply
voltage (V
CC
; pin 35) or use of the built-in ‘passive
standby’ mode causes strong disturbances on the output
pins because of the rise or drop of the output’s DC
voltages. The TDA9615H includes three integrated mute
switches to block such disturbances and avoiding the need
of an external mute circuit. By connecting the power mute
switches behind the line and RFC output capacitors
pop-free line and RFC output signals are realized.
Power muting is active when control byte bit MUTE = 1.
Because this also is the POR default state, muting is
automatically activated when the power supply voltage is
switched on. The integrated mute switches (MUTEC,
MUTEL and MUTER; pins 13, 14 and 17) are closed,
forming a low impedance path to ground. Furthermore the
line and RFC outputs (RFCOUT, LINEL and LINER;
pins 12, 15 and 16) are current limited to 1 mA to achieve
good attenuation without the need for a series resistor
between output and mute switch. Although the decoder
outputs (DECL and DECR; pins 18 and 19) have no
integrated muting these are current limited also for use
with the integrated mute switches or to assist possible
external muting.
After the output DC voltage is settled the power mute
function can be deactivated by selecting MUTE = 0.
Now the mute switches are opened showing a high
impedance of 100 k
to ground and output current limiting
is deactivated. Note that the time needed for output DC
settling is proportional to the output capacitor value used;
with a 10
μ
F capacitor a safe mute time to use is 200 ms
(i.e. t
mute
= C
×
20000). Using such controlled muting very
good performance is achieved for power-up, power-down
and ‘passive standby’ mode switching.
At a sudden supply power loss however (e.g. mains power
plug pulled) there may be no time to activate the power
mute function via the I
2
C-bus. A power-down detector
however instantly activates the power mute function in
case the supply voltage falls below 7 V (auto-mute).
For proper muting supply voltage drop rate should not
exceed 1 V/10 ms.
Fig.12 Example of power mute control and auto-mute function.
(1) POR.
handbook, full pagewidth
MGK476
VCC
auto-mute
(VCC < 7 V)
bit MUTE
(
1
)
(
1
)
bit STBP
pins 13, 14 and 17
pins 12, 15 and 16
output signal
with power mute
tmute
tmute
tmute
tmute
tmute
auto-mute
power
off
active
operation
power
off
active
operation
power off
(standby)
active
operation
passive
standby
相關(guān)PDF資料
PDF描述
TDA9615H Audio processor for VHS hi-fi(應(yīng)用于VHS高保真的音頻處理器)
TDA9811 Multistandard VIF-PLL with QSS-IFand AM demodulator(帶QSS-IF和AM解調(diào)器的多標(biāo)準(zhǔn)的VIF-PLL)
TDA9812 Multistandard VIF-PLL andFM-PLL/AM demodulator(多標(biāo)準(zhǔn)的VIF-PLL 和FM-PLL/AM解調(diào)器)
TDA9812T Multistandard VIF-PLL and FM-PLL/AM demodulator
TDA9813T VIF-PLL with QSS-IF and dual FM-PLL demodulator(帶QSS-IF和雙路FM-PLL解調(diào)器的VIF-PLL)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA9615H 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Audio processor for VHS hi-fi
TDA9725 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Y/C automatic adjustment processor VHS standard
TDA9800 制造商:NXP Semiconductors 功能描述:Video/TV Circuit, TV Video Receiver Circuit, 20 Pin, Plastic, DIP
TDA9800T 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:VIF-PLL demodulator and FM-PLL detector
TDA9801 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Single standard VIF-PLL demodulator and FM-PLL detector
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