TDA7421 datasheet(12/38 Pages) STMICROELECTRONICS

12 / 38 page

ELECTRICAL CHARACTERISTICS (continued)

AM IF2 Amplifier

Ref: AM Test Circuit, measure input at VIP2AMPIN, output at VIP2AMPOUT, (switches must be in position 1),

fIN = 450KHz.

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

RIN,IF2AMP

Input Resistance

Ω

GIF2AMP

Maximum Gain

VIF2AMPIN = 10dBu

AGCAMPCP

Central Point of AGC2 Intevention

on IF2 Amp

VIF2AMPIN = 72dBu; Value of

VIF2AMPOUT

115

dBu

AGCAMPSP

AGC2 Starting Point on IF2 Amp

Value of VIF2AMPIN for which

VIF2AMPOUT is AGCAMPCP - 3dB

dBu

AGCAMPR

AGC2 Range on IF2 Amp

fIN = 10.7MHz; Range of

VMIX2AMIN = for which VMIX2OUT is

AGCMIXCP

±3dB

AGCTCR

AGC2 Time Constant Ratio

Ratio of AGC2 "reception" Time

Constant and "seek" Time Constant

150/5

s/s

IFAMST

AM IF2 Output Level at pin 28

VIF2AMPIN = 72dBu;

AMSTEREO set to 1

104

106

108

dBu

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, measure at VMIX2AMIN, outputs at VAMSMETER and at VAMSD (switches in position 2),

- fIN = 10.7KHz.

- AMSEEK set to 1

Symbol

Parameter

Test Condition

Min.

Typ.

Max

Unit

AMSM1

AM Smeter 1 at VAMSMETER

VMIX2AMIN = 35dBu

2.2

2.89

3.6

AMSM2

AM Smeter 2 at VAMSMETER

VMIX2AMIN = 65dBu

2.5

3.26

4.0

AMSM3

AM Smeter 3 at VAMSMETER

VMIX2AMIN = 95dBu

3.0

3.73

4.5

AMSDMIN

Station Detector Minimum

Threshold

VMIX2AMIN at which VAMSD = 2.5V,

ASS3-0 set to 0000

dBu

AMSDMAX

Station Detector Maximum

Threshold

VMIX2AMIN at which VAMSD = 2.5V,

ASS3-0 set to 1111

dBu

IF Counter Output

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

Symbol

Parameter

Test Condition

Min.

Typ.

Max

Unit

IFCFM

FM IFC Sensitivity

VFMLIMIN at which Vpin 28 = 2.5V,

FMRECSEEK set to 1, EW2-0 set

to 101, IFS2-0 set to 010

dBu

IFCAM

AM IFC Sensitivity

VIF2AMPIN at which Vpin 28 = 2.5V,

AMSEEK set to 1, EW2-0 set to

011, IF2-0 set to 100, AMFM

STBY1-0 set to 10

dBu

IFCcurrent

IFC Current Capability

150

µA

TDA7421

12/38

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