TDA7540B datasheet(16/75 Pages) STMICROELECTRONICS

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Electrical specifications

TDA7540B

16/75

3.2.4

Stereodecoder

Table 7.

Electrical characteristics

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

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

circuit, unless otherwise specified).

Item

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Stereodecoder

23.1

Vin

MPX input level

STD Gain = 2,5 dB

0.5

0.93

Vrms

23.2

Rin

Input resistance

100

Ω

23.3

Gmin

Min. Stereodecoder gain

23.4

Gmax

Max. Stereodecoder gain

3.75

23.5

Gstep

Stereodecoder gain step

resolution

1.25

23.6

SVRR

Supply voltage ripple

rejection

Vripple = 100mV, f = 1kHz

23.7

Max. channel separation

VMPX = 500mVrms stereo

only L/R

23.8

THD

Total harmonic distortion

0.02

0.3

23.9

(S+N)/N

Signal plus Noise to Noise

ratio

A-weighted, 19kHz notch

23.10

Vpuafs

Pull up voltage for AFS pin

3.3

23.11

Rpuafs

Pull up resistor for AFS pin

Ω

23.12

VTH1

1. threshold for AFS PIN

2.4

23.13

VTH2

2. threshold for AFS PIN

0.8

Mono/Stereo-switch

24.1

VPTHST1

Pilot threshold voltage

for Mono->Stereo, PTH = 1

mVrms

24.2

VPTHST0

Pilot threshold voltage

for Mono->Stereo, PTH = 0

mVrms

24.3

VPTHMO1

Pilot threshold voltage

for Stereo->Mono, PTH = 1

mVrms

24.4

VPTHMO0

Pilot threshold voltage

for Stereo->Mono, PTH = 0

mVrms

19kHz PLL

25.1

flock

PLL lock range

Pilot magnitude

20 mVrms = 4%

18.9

19.1

kHz

25.2

Pilot deviation

Pilot frequency 19kHz

Deemphasis- and highcut

26.1

tHC50

Deemphasis time constant

DEEMP = 0, DESFT = 1

VLEVEL >> VHCH

µs

26.2

tHC75

Deemphasis time constant

DEEMP = 1, DESFT = 1

VLEVEL >> VHCH

µs

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