TDA7540N datasheet(23/76 Pages) STMICROELECTRONICS

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TDA7540N

Electrical specifications

23/76

GAMdelay

AM delay filter attenuation

f = 2.2kHz

2.0

Multipath detector

fCMP

Center frequency of multipath-

bandpass

stereo decoder locked on pilot

tone

kHz

GBPMP

Min. band pass gain

MPBPG

GBPMP

Max. band pass gain

MPBPG

GRECTMP

Min. rectifier gain

MPRG

-1

GRECTMP

Max. rectifier gain

MPRG

4.5

7.6

9.5

ICHMP

Rectifier charge current

MPCC = 0

0.5

0.8

1.2

μA

ICHMP

Rectifier charge current

MPCC = 1

0.2

0.4

0.6

μA

IDISMP

Rectifier discharge current

0.3

0.6

0.8

Quality detector

Min. MP influence factor

QDC

0.5

0.6

0.7

aMax. MP influence factor

QDC

0.9

1.05

1.2

Min. noise influence factor

QNG

Max. noise influence factor

QNG

Intermodulation Suppression

a2 = VO(signal,@1KHz) / VO(spurious, @1KHz) ; fs = (2x10KHz) - 19KHz

a3 = VO(signal,@1KHz) / VO(spurious, @1KHz) ; fs = (3x13KHz) - 38KHz

measured with: 91% stereo signal; 9% pilot signal; fm = 10kHz or 13kHz.

Traffic Radio (V.F.) Suppression

a57(V,W,F) = VO(signal,@1KHz) / VO(spurious, @1KHz+/-23KHz)

measured with: 91% stereo signal; 9% pilot signal; fm=1kHz; 5% sub carrier (f=57kHz, fm=23Hz AM, m=60%)

SCA ( Subsidiary Communications Authorization )

a67 = VO(signal,@1KHz) / VO(spurious, @9KHz) ; fs = (2x38KHz) - 67KHz

measured with: 81% mono signal; 9% pilot signal; fm=1kHz; 10%SCA – sub carrier ( fS = 67kHz, unmodulated ).

ACI (Adjacent Channel Interference )

a114 = VO(signal,@1KHz) / VO(spurious, @4KHz) ; fs = 110KHz - (3x38KHz)

a190 = VO(signal,@1KHz) / VO(spurious, @4KHz) ; fs = 186KHz - (5x38KHz)

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

All thresholds are measured inTestmode at the quality output. The thresholds are calculated by

VNBTH - VPEAK

VPEAK is adjusted by applying a 150kHz sinewave at MPXIN.

Table 8.

Stereodecoder electrical characteristics (continued)

(Tamb = 25°C, VCC1 = VCC2 = VCC3 = VCCST= VCCVCO = VCCMIX1 = VCCMIX2 = VCCIF1 = 8.5V,

VMPX = 500mVrms mono, f = 1kHz, deemphasis = 50µs, fXtal = 10.25MHz, in application

circuit, unless otherwise specified).

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

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