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參數(shù)資料
| 型號(hào)： | FMS6145MTC14 |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 9/11頁 |
| 文件大小： | 0K |
| 描述： | IC DRIVER VIDEO FLTR 5CH 14TSSOP |
| 標(biāo)準(zhǔn)包裝： | 94 |
| 類型： | 驅(qū)動(dòng)器 |
| 應(yīng)用： | 錄音機(jī)，機(jī)頂盒 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-TSSOP |
| 包裝： | 管件 |
| 其它名稱： | FMS6145MTC14_NL FMS6145MTC14_NL-ND |
LV49821VH
No.A1468-7/15
Usage Note
1. Input coupling capacitor (C1 and C2)
C1 and C2 are input coupling capacitors that are used to cut the DC component. The input coupling capacitors C1, C2
and the input resistors R1 and R3 make up the high-pass filter, attenuating the bass frequency. Therefore, the
capacitance value must be selected with due consideration of the cut-off frequency.
The cut-off frequencies are expressed by the following formulas.
1ch
fc1 = 1/(2π × C1 × R1)
2ch
fc2 = 1/(2π × C2 × R3)
This capacitor affects the pop sound at startup. Note with care that increasing the capacitance value lengthens the
charging time of the capacitor, which will make the pop sound louder.
2. BTL voltage gain
The voltage gain of the first amplifier is determined by the ratio between the resistors R1 and R2 (R3 and R4).
1ch
Vg1 = 20 × log(R2/R1) …unit: dB
2ch
Therefore, the BTL voltage gain is expressed by the following formulas.
1ch
VgBTL1 = 6 + 20 × log(R2/R1) … unit: dB
2ch
VgBTL2 = 6 + 20 × log(R4/R3) … unit: dB
The BTL voltage gain must be set in the range of 0 to 26 dB.
3. Beep signal input pin (pin 3)
This pin is connected to the non-inverting input block of the first amplifier of the BTL amplifier, and is biased
internally by a 50k
Ω resistor. The input coupling capacitor C4 and the bias resistor make up a high-pass filter that
attenuates bass band signals, so when determining the C4 capacitance value, the value must be set with due
consideration of the cut-off frequency. The cut-off frequency is expressed by the following formula.
fc3 = 1/(2π
× C4 × 50000)
In addition, when input from Pin 3, the BTL voltage gain is expressed by the following formulas.
1ch
VgBTL1 = 6 + 20 × log(1+R2/(R1 + ro)) … unit: dB
2ch
VgBTL2 = 6 + 20 × log(1+R4/(R3 + ro)) … unit: dB
When setting the signal level, the signal should be attenuated and input as shown in Fig.1.
When not using this input pin, connect it to pin 4 as shown in Application Circuit Example-2.
1
OUT
other IC
C1
ro
R1
13
R2
3
4
C4
C3
LV49821VH
VREF
Beep signal in
Fig.1
4. pin 4 capacitor (C3)
This capacitor is a ripple filter capacitor. The internal resistors (100k
Ω + 450kΩ) and C3 make up a low-pass filter that
is used to reduce the power supply ripple component and increase the ripple rejection ratio.
Note that inside the IC, the rising-transient-response-characteristic of the pin 4 voltage (reference voltage) is used to
activate the automatic pop sound reduction circuit. Therefore, when reducing the C3 capacitance value to increase the
voltage rise speed, the design should take into account that the pop sound increases during voltage rise.
5. Power supply line capacitor (C7and C8)
The bypass capacitor C8 is used to remove the high frequency component that cannot be eliminated by the power
supply capacitor C7 (chemical capacitor). Place the bypass capacitor C8 as near to the IC as possible, and use a
ceramic capacitor with good high frequency characteristics.
When using a stabilized power supply, these capacitors can also be combined into a single 2.2
μF ceramic capacitor.
Note that when the power supply line is relatively unstable, the power supply capacitor C7 capacitance value must be
increased.
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|---|---|
| FMS6145MTC14_NL | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Low Cost Five Channel 4th Order Standard Definition Video Filter Driver |
| FMS6145MTC14X | 功能描述:視頻 IC Video Filter Driver RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| FMS6145MTC14X_NL | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Low Cost Five Channel 4th Order Standard Definition Video Filter Driver |
| FMS6146 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:PCB Layout Considerations for Video Filter / Drivers |
| FMS6146_07 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Low-Cost Six-Channel 4th-Order Standard Defi nition Video Filter Driver |
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