TDA7420 Ver la hoja de datos (PDF) - STMicroelectronics

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Fabricante

TDA7420

MULTIFUNCTION AUDIO PROCESSOR

STMicroelectronics 

TDA7420

NOTES TO THE CHARACTERISTICS

1 INTERMODULATION SUPPRESSION

α2

=

VO (signal) (at1KHz)

VO (spurious) (at1KHZ)

;

fs

=

(2

x

10KHz)

-

19KHz

α3

=

VO (signal) (at1KHz)

VO (spurious) (at1KHZ)

;

fs

=

(3

x

13KHz)

-

38KHz

measured with : 91% mono signal; 9% pilot signal; fm=10KHz or 13KHz.

2. TRAFFIC RADIO (V.F.) suppression

α57 (V.W.F.) =

VO

VO(signal) (at1KHz)

(spurious) (at1KHZ ±23Hz)

measured with : 91% stereo signal; 9% pilot signal; fm=1KHz; 5% subcarrier

(f=57KHz, fm = 23Hz AM, m = 60%)

3. SCA (SUBSIDIARY COMMUNICATIONS AUTHORIZATION)

α67

=

VO(signal) (at1KHz)

VO (spurious) (at9KHZ)

;

fs

=

(2

x

38KHz)

-

67KHz

measured with : 81% mono signal; 9% pilot signal; fm=1KHz;

10% SCA - subcarrier (fs = 67KHz, unmodulated).

4. ACI (ADJACENT CHANNEL INTERFERENCE)

α114

=

VO(signal) (at1KHz)

VO (spurious) (at4KHZ)

;

fs

=

110KHz -

(3

x

38KHz)

α190

=

VO(signal) (at1KHz)

VO (spurious) (at4KHZ)

;

fs

=

186KHz -

(5

x

38KHz) -

measured with 90% mono signal; 9% pilot signal; fm = 1KHz; 1% spurious signal

(fs = 110KHz or 186KHz, unmodulated).

5: Control range for High Cut Control and Stereo Blend is VR - 400mV ≤ VSB, VHCC ≤VR

Figure : High Cut Control

Figure : Stereo Blend

fc

(KHz)

D94AU183

SEP

(dB)

D94AU184

40

3

30

2

20

1

10

8/29

0

-500 -400 -300 -200 -100 0 VHCC-VR

0

-400

-300

-200

-100 VSB - VR

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