HA12215F datasheet(13/84 Pages) RENESAS

13 / 84 page

HA12226F/HA12227F

Rev.6.00 Jun 15, 2005 page 13 of 83

Time constant of detection

Figure 6(1) generally shows that detection time is in proportion to value of capacitor C13. But, with Attack*1 and

Recovery*2 the detection time differs exceptionally.

Notes: 1. Attack

: Non-music to Music

2. Recovery : Music to Non-music

C13

(1)

(2)

(3)

R13

Recovery

Attack

Input level

Detection level

Figure 6 Function Characteristic of MS

Like the figure 6(2), Recovery time is variably possible by value of resistor R13. But Attack time gets about fixed

value. Attack time has dependence by input level. When a large signal is inputted, Attack time is short tendency.

Music Sensor Output (MSOUT)

As for internal circuit of music sensor block, music sensor output pin is connected to the collector of NPN type

directly, output level will be “high” when sensing no signal. And output level will be “low” when sensing signal.

Connection with microcomputer, it is requested to use external pull up resistor (RL = 10 k

Ω to 22 kΩ)

Note: Supply voltage of MSOUT pin must be less than VCC voltage.

The Tolerances of External Components for Dolby NR-Block (Only the HA12226F)

For Dolby NR precision securing, please use external components shown at figure 7. If leak-current are a few

electrolytic-capacitor, it can be applicable to C5 and C23.

DET (L)

HA12226F

0.1

±10%

DET (R)

C23

0.1

±10%

33k

±2%

BIAS1

Figure 7 Tolerance of External Components

HA12215F Datasheet(PDF) 13 Page - Renesas Technology Corp