TDA7340 datasheet(8/16 Pages) STMICROELECTRONICS

8 / 16 page

ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

NOISE INTERFERENCE DETECTOR

VTR

Trigger Threshold (1)

(see pulse slope fig 3)

meas. with

VRECT = 1.2V

NTB = 00

100

mVP

NTB = 10

130

mVP

NTB = 11

170

mVP

meas. with

VRECT = 1.4V

NTB = 00

150

mVP

NTB = 10

200

mVP

NTB = 11

250

mVP

VRECT

Rectifier Voltage

VMPXIN = 0mV

0.5

0.9

1.3

VMPXIN = 50mV;f = 150KHz

1.5

VMPXIN = 100mV; f = 150KHz

2.0

2.5

3.0

Suppression Pulse Duration

CBLANK = 470pF

µs

IOS

Input Offset Current During

Suppression Time

(1) NTB represent the STDEC programming bit pair D6,D5 for the noise blanker trigger threshold

NOTES TO THE CHARACTERISTICS

1 INTERMODULATION SUPPRESSION

α2 =

(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 =

(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)

TDA7340

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