TDA7420 datasheet(8/29 Pages) STMICROELECTRONICS

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NOTES TO THE CHARACTERISTICS

1 INTERMODULATION SUPPRESSION

α2 =

VO (signal)(at1KHz)

(spurious)(at1KHZ)

;fs = (2 x 10KHz) - 19KHz

α3 =

(signal)(at1KHz)

(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(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)

(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)

(spurious)(at4KHZ)

;fs = 110KHz - (3 x 38KHz)

α190 =

VO(signal) (at1KHz)

(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

-500

-400

-300

-200

-100

0 VHCC-VR

(KHz)

D94AU183

Figure : High Cut Control

-400

-300

-200

-100

VSB -VR

SEP

(dB)

D94AU184

Figure : Stereo Blend

TDA7420

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