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PDF ( 数据手册 , 数据表 ) LUCL7590CAE-DT

零件编号 LUCL7590CAE-DT
描述 Telephone Ringing Driver
制造商 Agere Systems
LOGO Agere Systems LOGO 


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LUCL7590CAE-DT 数据手册, 描述, 功能
Data Sheet
June 1998
L7590C Telephone Ringing Driver
Features
s Applies a battery-backed, single-ended, sinusoidal
ringing signal to the telephone loop
s Ringing capability:
— 40 Vrms into 5 North American REN
— 30 mApeak into 4 German REN
s Built-in current limiting
s Low power dissipation in idle and ringing modes
s Requires 5 V, a high-value negative dc supply, and
a digital input sequence
Description
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).
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.
The L7590C IC is optimized for low power dissipation
and is available in a 16-pin, surface-mount package.
GNDD VDD
GNDR CB1 CB2
EN
CLK
CLOCK
CONTROL
BIAS
CIRCUIT
VREF
VNEG
LEVEL
SHIFT
AND
OUTPUT
TIMING
CURRENT
LIMIT
30
VNEG
Figure 1. Block Diagram
OUT
L1
L2
12-3057a (f)







LUCL7590CAE-DT pdf, 数据表
L7590C Telephone Ringing Driver
Data Sheet
June 1998
Application (continued)
HP 8116A
PULSE/FUNCTION
GENERATOR
100 kHz RATE
HP 3311A
SIGNAL
GENERATOR
25 Hz
SIGNAL LEVEL = 0 V TO 5 V
+5 V
0.1 µF
GNDD VDD CB1 CB2
100 kHz (PWM)
OUT
CLK
L7590C
L1
EN
VREF
L2
VNEG GNDR
C2
1 µF
RX
RILIM
20 mH
C1
1.0 µF
CNEG
1.0 µF
VNEG = –170 V
450
3.4 µF
HP 3585A
SPECTRUM
ANALYZER
1386
40 µF
Notes:
THD % = -------------E-----2---2-----+----E-----3---2-----+-----E----4----2----+-----.---.---.----------x 100.
E12 + E22 + E32 + E42 + . . .
RX = 15 .
Figure 5. L7590C Test Connections
12-3375.B(F)
8 Lucent Technologies Inc.














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