TDA7421N datasheet(14/38 Pages) STMICROELECTRONICS

14 / 38 page

TDA7421N

14/38

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

IFAMST

AM IF2 Output Level at pin 28

VIF2AMPIN = 72dBmV;

AMSTEREO set to 1

106

µV

IFAMSTcurr

Current Capability of pin 28

AMSTEREO set to 1

150

µA

AM Field Strength Meter and Field Strength Station Detector

Ref: AM Test Circuit; fIN = 10.7MHz, measure input at VMIX2AMIN, outputs at VAMSMETER and at VAMSD (switches in

position 2).

AMSM1

AM Smeter 1 at VAMSMETER

VMIX2AMIN = 40dBµV

1.4

AMSM2

AM Smeter 2 at VAMSMETER

VMIX2AMIN = 60dBµV

3.4

AMSM3

AM Smeter 3 at VAMSMETER

VMIX2AMIN = 80dBµV

4.8

AMSDMIN

Station Detector Minimum

Threshold

VMIX2AMIN at which VAMSD = 2.5V;

ASS3-0 set to 0000, SEEK set to 1

µV

AMSDMAX

Station Detector Maximum

Threshold

VMIX2AMIN at which VAMSD = 2.5V;

ASS3-0 set to 1111, SEEK set to 1

µV

IF Counter Output

Ref: AM & FM Test Circuit, measure at pin 28

IFCFM

FM IFC Sensitivity

VFMLIMIN at which Vpin 28 =

2.5V, SEEK set to 1, EW2-0 set

to 101, IFS2-0 set to 010

µV

IFCAM

AM IFC Sensitivity

VIF2AMPIN at which Vpin 28 =

2.5V, SEEK set to 1, EW2-0 set

to 011, IF2-0 set to 100, AMFM

STBY1-0 set to 10

µV

IFCcurrent

IFC Current Capability

150

µA

SD output Impedance

Measure output at VFMSD

SDIMP,ON

SD output impedance

SDDIS set to 0

700

Ω

SDIMP,TS

SD output impedance (Tri-State)

SDDIS set to 1

Ω

Loop Filter Input/Output

(LP_IN1, LP_IN2, LP_IN3, LP_OUT)

-IIN

Input Leakage Current

VIN = GND; PDout = Tristate

-2

µA

IIN

Input Leakage Current

VIN = VDD; PDout = Tristate

-2

µA

VOL

Output Voltage Low

IIN = -0.2mA; VCC = 8.5V

0.5

VOH

Output Voltage High

IOUT = 0.2mA; VCC = 8.5V

IOUT

Output Current Sink

VPLL = 8.5V;

IOUT

Output Current Source

Vout = 0.5 to 8V

ELECTRICAL CHARACTERISTICS (Continued)

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