Datasheet > LUCL7590CAE-DT

LUCL7590CAE-DT

更新时间： 2024-11-20 22:17:51

品牌	Logo	应用领域
杰尔 - AGERE		驱动电话
页数	文件大小	规格书
10页	211K
描述
Telephone Ringing Driver

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数据手册

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LUCL7590CAE-DT 数据手册

Data Sheet

June 1998

L7590C Telephone Ringing Driver

Features

Description

■ Applies a battery-backed, single-ended, sinusoidal

ringing signal to the telephone loop

The L7590C Telephone Ringing Driver produces a

low-frequency sinusoidal ringing signal for analog

telephone loops. This is accomplished by producing

an output pulse stream that is an ampliﬁed replica of

the digital input.The output is then ﬁltered to produce

a sine wave. The peak-to-peak output level is deter-

mined by the magnitude of the negative high-voltage

dc applied to the device (up to –170 V).

■ Ringing capability:

— 40 Vrms into 5 North American REN

— 30 mApeak into 4 German REN

■ Built-in current limiting

■ Low power dissipation in idle and ringing modes

The required input is a 100 kHz CMOS-compatible

pulse stream, pulse-width modulated (PWM) at the

desired ringing frequency. The output stage consists

of one upper and one lower drive transistor with an

internal control circuit.

■ Requires 5 V, a high-value negative dc supply, and

a digital input sequence

The L7590C IC is optimized for low power dissipation

and is available in a 16-pin, surface-mount package.

GNDD

VDD

GNDR

CB1 CB2

OUT

CURRENT

LIMIT

30 Ω

LEVEL

SHIFT

CLOCK

CONTROL

AND

CLK

OUTPUT

TIMING

BIAS

CIRCUIT

VNEG

VREF

VNEG

12-3057a (f)

Figure 1. Block Diagram

12 3 4 5 6 7...10

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