STA309B datasheet(62/66 Pages) STMICROELECTRONICS

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Equalization and mixing

STA309B

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Doc ID 022570 Rev 2

8.5.3

RAMPTIM: ramp duration register (0x66)

This function is the total pop-free ramp duration (same value for ramp-up and ramp-down

and for all channels); default is 400 ms (range is 0-25 sec.).

8.5.4

TSPUPT: waiting time after EAPD (0x67 - 0x68)

This function is the waiting time after EAPD=1 to start ramp-up (same value for all

channels); default is 680 ms (range is 0-11 sec.). In a typical application the EAPD line is

connected to the TRI-STATE input pin of the STA5xx power stage through the RC filter (see

Figure 9 on page 61). TSPUPT shall be greater than the RC time constant.

8.5.5

LSPDWT: waiting time before EAPD (0x71 - 0x72)

This function is the waiting time after end of ramp-down to assert EAPD=0 (same value for

all channels); default is 1.4 sec. (range is 0-11 sec.). If a resistor is placed in parallel to the

output filter capacitor (see Figure 9 on page 61), the LSPDWT value is 0x00.

TR7

TR6

TR5

TR4

TR3

TR2

TR1

TR0

TP15

TP14

TP13

TP12

TP11

TP10

TP9

TP8

TP7

TP6

TP5

TP4

TP3

TP2

TP1

TP0

TL15

TL14

TLP13

TL12

TL11

TL10

TL9

TL8

TL7

TL6

TL5

TL4

TL3

TL2

TL1

TL0

STA309B Datasheet(PDF) 62 Page - STMicroelectronics

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