ELECTRICAL CHARACTERISTICS (continued)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

Trigger Threshold

0) 1)

NBT = 111

(c)

30

(c)

NBT = 110

(c)

35

(c)

NBT = 101

(c)

40

(c)

NBT = 100

(c)

45

(c)

NBT = 011

(c)

50

(c)

NBT = 010

(c)

55

(c)

NBT = 001

(c)

60

(c)

NBT = 000

(c)

65

(c)

Noise Controlled Trigger

Threshold

2)

NCT = 00

(c)

260

(c)

NCT = 01

(c)

220

(c)

NCT = 10

(c)

180

(c)

NCT = 11

(c)

140

(c)

Rectifier Voltage

NRD

0.5

0.9

1.3

V

1.5

1.7

2.1

V

2.2

2.5

2.9

V

deviation dependent

rectifier Voltage

3)

means. with

(75KHz dev.)

OVD = 11

0.5

0.9(off)

1.3

OVD = 10

0.9

1.2

1.5

OVD = 01

1.7

2.0

2.3

OVD = 00

2.5

2.8

3.1

Fieldstrength Controlled

Rectifier Voltage

4)

means. with

(fully mono)

FSC = 11

0.5

0.9(off)

1.3

V

FSC = 10

0.9

1.4

1.5

V

FSC = 01

1.7

1.9

2.3

V

FSC = 00

2.1

2.4

3.1

V

Suppression Pulse

Duration

5)

Signal HOLDN

in Testmode

BLT = 00

TBD

38

TBD

µs

BLT = 10

TBD

32

TBD

µs

BLT = 01

TBD

25.5

TBD

µs

BLT = 00

TBD

22

TBD

µs

Noise Rectifier

discharge adjustment

6)

Signal PEAK in

Testmode

NRD = 00

6)

(c)

0.3

(c)

V/ms

NRD = 01

6)

(c)

0.8

(c)

V/ms

NRD = 10

6)

(c)

1.3

(c)

V/ms

NRD = 11

6)

(c)

2.0

(c)

V/ms

Noise Rectifier Charge

Signal PEAK in

Testmode

PCH = 0

7)

(c)

10

(c)

mV/

µs

PCH = 1

7)

(c)

20

(c)

mV/

µs

(c) = by design/characterization functionally guaranteed through dedicated test mode structure

NOISE BLANKER PART

internal 2nd order 140kHz high pass filter

programmable trigger threshold

trigger threshold dependent on high frequency

noise with programmable gain

additional circuits for deviation and field-

strength dependent trigger adjustment

very low offset current during hold time due to

opamps wMOS inputs

four selectable pulse suppression times

programmable noise rectifier charge/discharge

current

TDA7400

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