TDA7400 datasheet(10/28 Pages) STMICROELECTRONICS

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ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

VADJMP

Noise Rectifier adjustment

through Multipath

Signal PEAK in

Testmode

MPNB = 00

(c)

0.3

(c)

V/ms

MPNB = 01

(c)

0.5

(c)

V/ms

MPNB = 10

(c)

0.7

(c)

V/ms

MPNB = 11

(c)

0.9

(c)

V/ms

0) All Thresholds are measured using a pulse with TR =2

µs, THIGH =2µs and TF =10µs. The repetitionrate must not increase the PEAK voltage.

1) NBT represents the Noiseblanker Byte bits D2,D0 for the noise blanker trigger threshold

2) NAT represents the Noiseblanker Byte bit pair D4,D3 for the noise controlled triggeradjustment

3) OVD represents the Noiseblanker Byte bit pair D7,D6 for the over deviation detector

4) FSC represents the Fieldstrength Byte bit pair D1,D0 for the fieldstrength control

5) BLT represents the Speaker RR Byte bit pair D7,D6 for the blanktime adjustment

6) NRD represents the Configuration-Byte bit pair D1,D0 for the noise rectifier discharge-adjustment

7) PCH represents the Stereodecoder-Byte bit D5 for the noise rectifier charge-current adjustment

8) MPNB represents the HighCut-Byte bit D7 and the Fieldstrength-Byte D7 for the noise rectifier multipath adjustment

65mV

30mV

8 STEPS

NOISE CONTROLLED

TRIG. THRESHOLD

MIN. TRIG. THRESHOLD

260mV(00)

220mV(01)

180mV(10)

140mV(11)

0.9V

VTH

1.5V

VPEAK(V)

D97AU648

Figure 1. Trigger Threshold vs.VPEAK

VPEAK

(VOP)

D97AU649

DEVIATION(KHz)

0.9

1.2

2.0

2.8

DETECTOR OFF (11)

32.5

Figure 2. Deviation Controlled Trigger Adjust-

ment

VOP

VIN

THIGH

Time

D97AU636

TDA7400

10/28

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