E-TDA7514TR View Datasheet(PDF) - STMicroelectronics

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Description

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E-TDA7514TR

SINGLE-CHIP FM/AM TUNER WITH STEREO DECODER AND AUDIO PROCESSOR

STMicroelectronics 

TDA7514

Table 8. Quality Actuators (continued)

Symbol

Parameter

Test Condition

Min. Typ. Max.

Unit

ATTMAX/MIN

The maximum high cut attenuation can be selected via I2C [addr 8C, subaddr 23d, bits D2 to D1].

NOTES:

- The maximum high cut frequency setting can make the maximum attenuation lower than this. But then

you effectively have a fixed rolloff filter, because the max high cut frequency will keep the hcc filter

frequency from moving any higher, and the max high cut attenuation will keep the hcc filter frequency

from moving any lower.

- Also, there is an alternative way of setting the maximum high cut attenuation, but only if a maximum

high cut frequency does not need to be selected. The FAST3 can be set to limit the minimum high cut

frequency [addr 8C, subaddr 25d, bit D6], then any of the 32 high cut frequencies can be selected to

limit the max attenuation.

Max/Min high Cut

00

Attenuation(at 10kHz)@

HCC range 20kHz~4kHz

01

10

-1.8

dB

-4.4

dB

-6.2

dB

11

-7.0

dB

Max/Min high Cut

00

Attenuation(at 10kHz)@

HCC range 10kHz~2kHz

01

10

-5.6

dB

-9.3

dB

-11.5

dB

11

-12.4

dB

Fixed Rolloff

There are two ways to set the HCC filter to a fixed filter (there will be no

dynamic movement of the filter). Both of these will set the filter to the

corner frequency selected in the Max/Min High Cut Frequency [addr

8C, subaddr 25d, bits D4 to D0].

1) Set the FAST3 to Fixed High Cut ON [addr 8C, subaddr 25d, bit D7].

2) Turn High Cut OFF [addr 8C, subadress 23, bit D0] and Fix

Maximum High Cut Frequency [addr 8C, subaddr 25d, bit D6]

22/74

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