L3240 Просмотр технического описания (PDF) - STMicroelectronics

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L3240

ELETRONIC TWO-TONE RINGER

STMicroelectronics 

L3240

ELECTRICAL CHARACTERISTICS

(Tamb = 25oC ; VS = applied between pins 7-2 ;otherwise specified)

AC OPERATION

Symbol

Parameter

Output Frequencies

Fout 1

Fout 2

Fout 1

Fout 2

Programming Resistor Range

Sweep Frequency

Test Conditions

Vs = 26 V, R1 = 14 KΩ

Vs = 0 V

Vs = 6 V

R1 = 14kΩ, C1 =100nF

Min. Typ. Max. Unit

kHz

2,29

2,8

1.6

2.1

1.33

1.43

8

56

kΩ

5.25 7,5 9.75 Hz

Figure 1 : Test Circuit.

Figure 2 : Typical Application with Balanced

Output.

Figure 3 : Application Compatible with LS1240

(single ended output).

Figure 4 : F1 Out vs. R1.

R1 ≈

3.56 x 104

F1 (HZ)

x (1 – 0.12 x ln F1 )

2543

f2 = 0.725 f1

fSWEEP =

750

C1 (nF)

3/6

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