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參數(shù)資料
| 型號： | 2SJ492-S |
| 元件分類： | JFETs |
| 英文描述： | 20 A, 60 V, 0.185 ohm, P-CHANNEL, Si, POWER, MOSFET, TO-262AA |
| 封裝： | TO-262, 3 PIN |
| 文件頁數(shù)： | 10/10頁 |
| 文件大?。?/td> | 266K |
| 代理商： | 2SJ492-S |
LA4815VH
No.A1374-9/15
11. Signal mixing methods
The following methods can be used to mix a beep, key tone or other signal into the audio signal. Note that when input
to Pin 4 is selected, amplification of signals input from Pin 4 changes according to impedance Z4 connected to Pin 13.
11-1. Mixing method using resistors in the Pin 13 input front end
Figure 10
11-2. Method using input to Pin 4
First signal system (Signal-1) voltage gain : Vg1
Vg1 = 20log (Vout/Vin1) = 20log (4 × (125 + Z4) (500 + (125 × Z4/(125 + Z4)))/(25 × Z4))
* Z4 = R1 + ro
Second signal system (Signal-2) voltage gain : Vg2
Vg2 = 20log (Vout/Vin2) = 20log (10000/(125 + R1))
* fc2 = 1/(2
π × Cin2 × (R1 + 125))
Figure 11
12. Short-circuit between pins
Turning on the power supply with some pins short-circuited may cause deterioration or breakdown. Therefore, when
mounting the IC on a board, check to make sure that no short-circuit is formed between pins by solder or other foreign
substances before turning on the power supply.
13. Load short circuit
Leaving the IC for a long time in the condition with a load short circuit may cause deterioration or breakdown.
Therefore, never short-circuit the load.
14. Maximum ratings
When used under conditions near the maximum ratings, even a slight fluctuation in the conditions may cause the
maximum ratings to be exceeded, possibly resulting in a breakdown or other accidents. Therefore, always provide
enough margin for fluctuations in the supply voltage and other conditions, and use within a range not exceeding the
maximum ratings.
Vbias
100k
+
-
+
-
Pre-Amp
Rg2
Rg1
Signal-2
Signal-1
other IC
ro
R1
Vin2
ro
LA4815VH
Cin
Cin2
Vin1
Vout
+
125
10k
PWR - Amp
500
OUT
OUT1
OUT2
IN
GAIN2
13
4
1
Vbias
100k
+
-
Pre-Amp
Rg2
Rg1
Signal-2
Signal-1
other IC
ro
Rg3
Vout2
Vout1
ro
LA4815VH
Cin
Vin
IN
OUT1
OUT2
13
Pin 13 input impedance : Zin = 100k
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