HA12216F Datasheet, PDF (12/53 Pages) Hitachi Semiconductor – Audio Signal Processor for Car Deck(Decode only Dolby B type NR with PB Amp.)

HA12216F/HA12221F Series
1. Serch mode
G_V1 = 20dB + 20log
1+
90k
REX2
[dB]
f₁ =
1
2π ⋅ CEX2 ⋅ REX2
[Hz], f₂ = 25k [Hz]
2. Repeat mode
G_V2 = 20dB + 20log
1+
90k
REX1
[dB]
f₃ =
1
2π ⋅ CEX1 ⋅ REX1
[Hz], f₄ = 25k [Hz]
G_VIA: L·R signal addition circuit gain.
The sensitivity of music sensor (S) is computed by the formula mentioned below.
S=−
G_V*¹
−
20log
130*³
30*²
= 12.7 − G_V
[dB]
Note: 1. Search mode: G_V1, Repeat mode: G _V2
2. Standard level of TAI pin (Dolby level correspondence) = 30 mVrms
3. Standard sensing level of music sensor = 130 mVrms
S
S
Item
Search mode
REX1, 2
24 kΩ
CEX1, 2
0.01 µF
G_{V1, 2}
33.5 dB
f_{1, 3}
663 Hz
f_{2, 4}
25 kHz
(one side
channel)
–14.8 dB
(both
channel)
–20.8 dB
Repeat mode 2.4 kΩ
1 µF
51.7 dB
66.3 Hz
25 kHz
–33.0 dB –39.0 dB
Note: S is 6 dB down in case of one-side channel. And this MS presented hysteresis lest MSOUT terminal should turn
over again Hi level or Lo level, in case of thresh S level constantly.
Music Sensor Time Constant
1. Sensing no signal to signal (Attack) is determined by C6, 0.01 µF to 1 µF capacitor C6 can be applicable.
2. Sensing signal to no signal (Recovery) is determined by C6 and R11, however preceding (1), 100 kΩ to 1 MΩ can
be applicable.
Music Sensor Output (MSOUT)
As for the internal circuit of music sensor block, music sensor output pin is connected to the collector of NPN type
directly, therefore, output level will be “high” when sensing no signal. And output level will be “low” when sensing
signal.
I_L =
DV_CC − MSOUT_LO*
R_L
* MSOUT_LO : Sensing signal (about 1V)
Note: 1. Supply voltage of MSOUT pin must be less than V_CC voltage.
Rev.6.00 Jun 15, 2005 page 12 of 52