m61528fp Renesas Electronics Corporation., m61528fp Datasheet - Page 16

• Manufacturer Part Number: m61528fp
• Description: Scf Type Fixed Equalizer For Car Audio
• Manufacturer: Renesas Electronics Corporation.

M61528FP
• SOFT-CHANGING 2
This is the circuit which changes gain by 2dB step.
This function can work as follows,
For example, the movement when Fader is changed from 0dB to –6dBis shown in the right figure(ex.2).
After this IC receive the data of fader:-6dB,
this circuit changes fader setting from 0dB to –6dB by 2dB step.
Switching time is the time when it was set up with Soft-changing time.
Total changing time is as the follows.
In the case of the right figure, total changing time is 99mS. (33mS × 3 steps)
Rev.1.1, Dec.17.2003, page 16 of 30
(1) At the time of Soft-changing ON.
(2) Slot15/D6=1
(3) After the last Soft-changing is completed.
When Soft-changing time is long, step noise is more reduced. Because the step noise is has relations with Soft-
changing time. We recommend SOFT-CHANGING 2.
However, please confirm step noise by listening test, and judge it.
●Total changing time=Soft-changing time × the number of the step
(ex. 2) Fader : 0dB→-6dB changing. Soft-changing time : 33ms
* 1) While Soft-changing works (PIN15 output “H”) ,
* 2) PIN15 outputs “L”exc ept for the time of Sof t-changing.
t:Soft-changing time (You may change it with serial DATA.)
CLOCK
DATA
“0dB ” ⇒ “-2dB ” ⇒ “-4dB ” ⇒ “-6dB ”
next data isn't accepted.
While Soft-changing works ,
PIN15 output “H”
Output
15 pin
D0 to D14
Slot13
Fader
0dB
D15
t=33mS
The latch condition
Fader
-6dB