TDA7421N datasheet(10/38 Pages) STMICROELECTRONICS

Numer części	TDA7421N

Szczegółowy opis	AM/FM TUNER FOR CAR RADIO AND HI-FI APPLICATIONS

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Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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10 / 38 page

TDA7421N

10/38

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

GDEM

Demodulator Conversion Gain

VFMLIMIN > LS

2

mVRMS/

KHz

GDEMADJ

Demodulator Adjustment

Conversion Gain

VFMLIMIN > LS

14

mVRMS/

KHz

CAdjDem

Value of the minimum adjusting

capacitance step

DEM6-0 set to 0000001

50

fF

FM Audio Amplifier

Ref: FM Test circuit, VFMLIMIN, = 95dBµV, fIN = 10.7MHz; measure:

- MPX output at VAUDIO, BPF 200Hz to 15KHz, 50µs de-emphasis.

- muting voltage at VMUTE, DRIVE

VMUTE

Mute Voltage

VMUTE,DRIVE for which

∆VAF = -11.5dB;

AUM1-0 set to 11

2V

VPLAY

Play Voltage

VMUTE,DRIVE for which

∆VAF = -1dB, AUM1-0 set to 11

0.3

V

GAMP,PLAY

Audio Amplifier Gain in Play

Conditions

VMUTE,DRIVE < VPLAY

9dB

MUTEATTMIN Minimum Mute Attenuation

VMUTE,DRIVE > VMUTE;

AUM1-0 set to 00

-5

dB

MUTEATTMAX Maximum Mute Attenuation

VMUTE,DRIVE > VMUTE;

AUM1-0 set to 11

-12.5

dB

VAF

AF Output Level

fDEV = 75KHz, FMOD = 1KHz,

VMUTE,DRIVE < VMUTE

400

mVRMS

THD

AF Total Harmonic distortion

fDEV = 40KHz, FMOD = 1KHz,

VMUTE,DRIVE < VMUTE

0.3

%

S+N/N

AF Signal to Noise Ratio

fDEV = 40KHz, FMOD = 1KHz,

VMUTE,DRIVE < VMUTE

80

dB

AMR

Amplitude Modulation Rejection

AM modulation depht 30%,

fMOD = 1KHz, with respect to FM

modulated signal with fDEV =

40KHz, VMUTE,DRIVE < VMUTE

67

dB

AUDIOcurr

Output Current Capability

5

mA

MUTE Rout Mute Drive Output Resistance

1

K

Ω

FM QUALITY DETECTORS

Field Strength Detector

Ref: FM Test Circuit, HDDIS and BWDIS set to 1, measure:

- Input at VFMLIMIN, fIN = 10.7MHz, CW

- output at VMUTE,DRIVE

FSDMIN

Field Strength Detector

Minimum Threshold

VFMLIMIN level at which

VMUTE,DRIVE = VMUTE, FSM3-0

set to 0000

dB

µV

ELECTRICAL CHARACTERISTICS (Continued)

Podobny numer części - TDA7421N

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TDA7421N Arkusz danych(PDF) 10 Page - STMicroelectronics

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