LV3319PM Datasheet, PDF (23/26 Pages) Sanyo Semicon Device – For Car Audio Systems Electronic Volume IC

LV3319PM
Usage Cautions
(1) Request to send the initial data at power ON
• Though the circuit initializing the IC inside at power ON is incorporated, be sure to send data to all sub-address as the
initial data at power ON.
• At power ON, muting or other measures must be taken externally till the data is set.
Reference data
Parameter
Symbol
Conditions
Min
Typ
Max Unit
VDD power rise time
Trise 0V → 5V power rise time
30
-
- μs
VDD voltage when power ON reset is canceled
Vpor
-
5
-V
(2) Description of zero cross switching circuit operation
The LV3319PM have a function to switch zero cross comparator signal detection locations, enabling the selection of
the optimum detection location for blocks whose data is to be updated.Basically, the switching noise can be
minimized by inputting the signal immediately following the block whose data is to be updated to the zero cross
comparator, so it is necessary to switch the detection location every time.
Input gain
Volume
Fader
Switch
Zero cross
comparator
LV3319PM zero cross detection circuit
(3) Zero Cross Switching Control method
The zero cross switching control method consists of setting the zero cross control bits to the zero cross detection mode,
and specifying the detection blocks before transmitting the data.
The I²C data is held at rise of the ACK clock. For zero-cross operation, this operation begins at rise of ACK clock of
the first data.
On detecting zero cross, all of holding data are switched. (Without zero cross, data is switched at rise of ACK clock.)
(4) Zero cross timer setting
If the input signal becomes lower than the zero cross comparator detection sensitivity, or if only low-frequency
signals are input, zero cross detection continues to be impossible, and data is not latched during this time. The zero
cross timer can set a time for forcible latch during such a status when zero cross detection is not possible.
(5) Soft step operation
The LV3319PM have a soft step function at 3 band equalizer control block for low switching noise.
The Soft step time can be selected by send to I²C control. (l0ms, 20ms, 40ms, 80ms)
Data latch timing
soft step start
soft step time
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