m61528fp Renesas Electronics Corporation., m61528fp Datasheet - Page 15

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

M61528FP
Soft-Changing
This IC built in the Soft-changing circuit for reduce the step-noise of Fader when internal switch changing.
By this function, Switching noise of no-signal and some signals can be reduced.
• SOFT-CHANGING 1
This is the circuit which changes gain smoothly at the setup time.
This function can work as follows,
For example, the movement when Fader is changed from 0dB to –6dB is shown in the right figure(ex.1).
After this IC receive the data of fader:-6dB , this circuit changes fader setting from 0dB to –6dB at a time.
Switching time is the time when it was set up with Soft-changing time.
Soft-Changing Time
Time
83mS(41.5mS)
66mS(33mS)
41mS(20.5mS)
33mS(16.5mS)
The change of the Soft-changing time is possible by the setting of D2.
•D2=“1” : The left time of the left table.
(Soft-changing time : 83mS,66mS,41mS,33mS)
•D2=“0” : The right time of the left table
(Soft-changing time : 41.5mS,33mS,20.5mS,16.5mS)
Rev.1.1, Dec.17.2003, page 15 of 30
(1) At the time of Soft-changing ON.
(2) Slot15/D6=0
(3) After the last Soft-changing is completed.
(ex. 1) Fader : 0dB→-6dB changing. Soft-changing time : 33ms
D0
1
1
0
0
* 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
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
D1
1
0
1
0
Fader
-6dB
D2
1/0
1/0
1/0
1/0