TDA7338D datasheet(4/11 Pages) STMICROELECTRONICS

4 / 11 page

ELECTRICAL CHARACTERISTICS (continued)

HIGH CUT CONTROL

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

τdeemp

De-Emphasis Time Constant

C13,C14 = 1nF; V15-17 = 50mV

µs

R15-17

High Cut Control Resistance

V15 - 17 = 50mV

Ω

R15-17

High Cut Control Resistance

V15 - 17 = -0.5V (note 5)

115

150

185

Ω

VCO

fosc

Oscillator Frequency

with Murata CSB456F11

456

KHz

∆f/f

Capture and Holding Range

±1%

VVCO

VCO OFF

Pin 7

0.6

NOISE INTERFACE DETECTOR (test condition: VSB >VR + 50mV)

VTR

Trigger Threshold (note 6)

VPEAK = 1.3V; PROG = GND

180

VPEAK = 1.3V;

PROG = OPEN/VDD

250

VTR

Trigger Threshold

VPEAK = 1.5V; PROG = GND

260

VPEAK = 1.5V;

PROG = OPEN/VDD

340

Suppression Pulse Duration

CBLANK = 470pF

µs

IOS

Input Offset Current during

suppression time

VN1

VPEAK (pin 8)

VIN = 0mVRMS

0.7

1.0

1.3

VN2

VPEAK (pin 8)

VIN = 50mVRMS; f = 150KHz

1.1

1.5

VN3

VPEAK (pin 8)

VIN = 100mVRMS; f = 150KHz

1.7

2.3

2.8

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)

TDA7338

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