TDA7421N datasheet(11/38 Pages) STMICROELECTRONICS

Il numero della parte	TDA7421N

Spiegazioni elettronici	AM/FM TUNER FOR CAR RADIO AND HI-FI APPLICATIONS

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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TDA7421N

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

FSDMAX

Field Strength Detector

Maximum Threshold

VFMLIMIN level at which

VMUTE,DRIVE = VMUTE, FSM3-0

set to 1111

67.5

dB

µV

Detuning Detector

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

- Input at VFMLIMIN, CW

- output at VMUTE,DRIVE

DDSTART

Detuning Detector Starting Point frequency shift from 10.7MHz at

which VMUTE,DRIVE = VPLAY

±23

KHz

DDSLOPE,MIN Detuning Detector Minimum

Muting Slope

frequency shift from 10.7MHz +

DDSTART at which

VMUTE,DRIVE = VMUTE,

BWM2-0 set to 100, SEEK set to 0

30

KHz

DDSLOPE,MAX Detuning Detector Maximum

Muting Slope

frequency shift from 10.7MHz +

DDSTART at which

VMUTE,DRIVE = VMUTE,

BWM2-0 set to 001, SEEK set to 0

10

KHz

DDTRC

Detuning Detector Time

Constant Ratio

ratio of "reception" mode

integration time constant inside

the Detuning Detector with

respect to "seek" mode

34/6

s/s

Adjacent Channel Detector

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

- Input at VFMLIMIN: desired 10.7MHz, 95dBµV CW; undesired 10.8MHz CW

- output at VMUTE,DRIVE

ACDMAX

Adjacent Channel Quality

Detector Maximum Sensitivity

Threshold

amplitude of undesired signal at

which VMUTE,DRIVE = VMUTE,

HDM4-0 set to 11111

91

dBu

ACDMIN

Adjacent Channel Quality

Detector Minimum Sensitivity

Threshold

amplitude of undesired signal at

which VMUTE,DRIVE = VPLAY,

HDM4-0 set to 00000

94.8

dBu

Field Strength Station Detector

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

- Input at VFMLIMIN: desired 10.7MHz, CW

- output at VFMSD

FSSDMIN

Field Strength Station Detector

Minimum Threshold

VFMLIMIN level at which

VFMSD = 2.5V;

FSS4-0 set to 00000

dB

µV

FSSDMAX

Field Strength Station Detector

Maximum Threshold

VFMLIMIN level at which

VFMSD = 2.5V;

FSS4-0 set to 11111

dB

µV

ELECTRICAL CHARACTERISTICS (Continued)

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