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參數(shù)資料
| 型號： | LA2650 |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP20 |
| 封裝： | DIP-20 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 318K |
| 代理商： | LA2650 |
Notes on LA2650 Operation
LPF cutoff frequency
Use the following formula to calculate the cutoff frequency:
fc = 1/(2
πCR) Hz
However: R = 50 k
, since the resistor is on chip.
Thus the cutoff frequency can be set by the external capacitor.
Example: C = 0.039 F (As in the sample application circuit)
fc = 81.6 Hz
Maximum boost gain
Use the following formula to calculate the maximum boost gain.
BASS OUT total gain (GB) = α +4 × 20 log10 (1 + 4π2f2C2R2)–1/2 + β
Here,
α = Boost gain (20, 25, 30, or 35 dB)
β = Addition level (0, –3, –6, –9, –15, –20, –25, or –35 dB)
f: Frequency
C: The LPF external capacitor
R = 50 k
(built in)
Example: When
α = 35 dB, β = 0 dB, f = 50 Hz, C = 0.039 F (As in the application circuit)
GB = 29.46 dB
No. 5652-6/13
LA2650
Pin Functions
Pin No.
Pin
Pin voltage (V)
Pin function
Equivalent circuit
1
IN-L
1/2 VCC
Signal input pin
20
IN-R
The input impedance is 50 k
2
BOOST
0.7 to 2
Smoothing pin for boost on/off switching
ON/OFF
SMOOTHING
3
ENABLE
Apply either 0 or 5 V.
Serial control data input pins
4
DATA
5
CLOCK
7
DET-OUT
1.7 to 3.5
The detection attack and recovery times are set
by the external resistor and capacitor connected
to this pin.
8
LED
VCC max.
LED cathode
Influx current: 20 mA (maximum)
Continued on next page.
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| LA2655V | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Clear Sound Control IC Loading Plus Sound Algorithm |
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| LA266B-HRDBK-2-PF | 制造商:LIGITEK 制造商全稱:LIGITEK electronics co., ltd. 功能描述:LED ARRAY |
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