LA2650 Ver la hoja de datos (PDF) - SANYO -> Panasonic

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LA2650

Bass boost IC

SANYO -> Panasonic 

LA2650

Notes on LA2650 Operation

LPF cutoff frequency

Use the following formula to calculate the cutoff frequency:

· fc = 1/(2πCR) Hz

However: R = 50 kΩ, since the resistor is on chip.

Thus the cutoff frequency can be set by the external capacitor.

Example: C = 0.039 µF (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 kΩ (built in)

Example: When α = 35 dB, β = 0 dB, f = 50 Hz, C = 0.039 µF (As in the application circuit)

GB = 29.46 dB

Pin Functions

Pin No.

1

20

Pin

IN-L

IN-R

Pin voltage (V)

1/2 VCC

Pin function

Signal input pin

The input impedance is 50 kΩ

Equivalent circuit

2 BOOST

0.7 to 2

ON/OFF

SMOOTHING

Smoothing pin for boost on/off switching

3 ENABLE

4 DATA

5 CLOCK

Apply either 0 or 5 V. Serial control data input pins

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.

No. 5652-6/13

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