ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Trigger Threshold

0) 1)

NBT = 111

30

NBT = 110

35

NBT = 101

40

NBT = 100

45

NBT = 011

50

NBT = 010

55

NBT = 001

60

NBT = 000

65

Noise Controlled Trigger

Threshold

2)

NCT = 00

260

NCT = 01

220

NCT = 10

180

NCT = 11

140

Rectifier Voltage

0.9

V

1.7

V

2.5

V

deviation dependent

rectifier Voltage

3)

means. with

(75KHz dev.)

OVD = 11

0.9(off)

OVD = 10

1.2

OVD = 01

2.0

OVD = 00

2.8

Fieldstrength Controlled

Rectifier Voltage

4)

means. with

(fully mono)

FSC = 11

0.9(off)

V

FSC = 10

1.3

V

FSC = 01

1.8

V

FSC = 00

2.3

V

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 trigger adjustment

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

VOP

VIN

DC

TR

THIGH

TF

Time

D97AU636

NOISE BLANKER PART

internal 2nd order 140kHz high pass filter

programmable trigger threshold

additional circuits for trigger adjustment (devia-

tion, field-strenght)

very low offset current during hold time

four selectable pulse suppression times

TDA7403

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