TDA7541 datasheet(24/76 Pages) STMICROELECTRONICS

24 / 76 page

Electrical specifications and characteristics

TDA7541

24/76

SCA (subsidiary communications authorization)

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

ACI (adjacent channel interference)

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

All thresholds are measured in test mode at the quality output. The thresholds are calculated by VNBTH - VPEAK. VPEAK can

be adjusted by applying a 150 kHz sinewave at MPXIN.

a67

o signa l @ 1 k Hz

()

o spuriou s @9 kHz

()

------------------------------------------------------------- ƒs

38kHz

() 67kHz

–

()

;

a114

o signa l @ 1 k Hz

()

o sp urio us @ 4 kHz

()

------------------------------------------------------------- ƒs

110kHz

38kHz

()

–

()

;

a190

o signa l @ 1 k Hz

()

o sp urio us @ 4 kHz

()

------------------------------------------------------------- ƒs

186kHz

38kHz

()

–

()

;

Table 9.

PLL section

(Tamb=25°C, VCC1=VCC2=VCCMIX1=VCCVCO=VCCIF=8.5V, fXtal = 10.25 MHz,

VMPX=500mVrms mono, f=1kHz, de-emphasis τ=50µs, in application circuit, unless

otherwise specified)

Item

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

40. Voltage controlled oscillator (VCO)

40.1

fVCOmin Min. VCO frequency

160

MHz

40.2

fVCOmax Max. VCO frequency

260

MHz

40.3

C/N

Carrier-to-noise-ratio

fVCO= 200MHz, Δf=1KHz,

B=1Hz, Qloaded=60

dBc/

√Hz

41. Crystal oscillator

41.1

fxtal

Crystal frequency

10.25

MHz

41.2

C/N

Carrier-to-noise-ratio

fxtal =10.25MHz, Δf=10KHz

110

dBc/

√Hz

41.3

V29

Oscillator output voltage

400

mVrms

41.4

C29-32

Input capacitance

2.5

41.5

Cstep

Min. cap. Step

XTAL

0.75

41.6

Cmax

Max. cap.

XTAL

23.25

41.7

Δf/f

Deviation versus VCC

Δ V

CC=1V

1.5

ppm/V

41.8

Δf/f

Deviation versus T

-40°C<T<+85°C

0.2

ppm/K

42. Charge pump current

42.1

-I20

Source current

V20 = 2.5V

μA

42.2

I20

Sink current

μA

42.3

-I20

Source current

ICP, V20 = 2.5V

550

μA

42.4

I20

Sink current

500

μA

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