ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Carrier and harmonic suppression at the output

α19

Pilot Signal f = 19KHz

40

50

dB

α38

Subcarrier f = 38KHz

75

dB

α57

Subcarrier f = 57KHz

62

dB

α76

Subcarrier f = 76KHz

90

dB

Intermodulation (Note 1)

65

dB

75

dB

Traffic Ratio (Note 2)

α57

Signal f = 57KHz

70

dB

SCA - Subsidiary Communications Authoorization (Note 3)

α67

Signal f = 67KHz

75

dB

ACI - Adjacent Channel Interference (Note 4)

α114

Signal f = 114KHz

95

dB

α190

Signal f = 190KHz

84

dB

Notes to the characteristics:

1. Intermodulation Suppression:

α2 =

=(2 x 10KHz)− 19KHz

α3 =

=(3 x 13KHz)− 38KHz

measured with: 91% pilot signal; fm = 10kHz or 13kHz.

2. Traffic Radio (V.F.) Suppression: measured with: 91% stereo signal; 9% pilot signal; fm=1kHz; 5% subcarrier (f = 57kHz,

fm = 23Hz AM, m = 60%)

α57 (V.W>F.

)=

3. SCA ( Subsidiary Communications Authorization ) measured with: 81% mono signal; 9% pilot signal; fm = 1kHz; 10%SCA - subcarrier

( fs = 67kHz, unmodulated ).

α67 =

;

=(2 x 38KHz)−67KHz

4. ACI ( Adjacent Channel Interference ):

α114 =

= 110KHz −

α190 =

= 186KHz −

measured with: 90% mono signal; 9% pilot signal; fm =1kHz; 1% spurious signal ( fs = 110kHz or 186kHz, unmodulated).

TDA7400

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