|
|
PDF L7590C Data sheet ( Hoja de datos )
| Número de pieza | L7590C | |
| Descripción | Telephone Ringing Driver | |
| Fabricantes | Agere Systems | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de L7590C (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
|
No Preview Available !
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 Ω
VNEG
Figure 1. Block Diagram
OUT
L1
L2
12-3057a (f)
1 page  
Data Sheet
June 1998
Application
L7590C Telephone Ringing Driver
TIP
RING
RP
20 Ω
RP
20 Ω
250 V PROT
L7581
RELAY
PT XMT
RCV
SLIC
PR
DX
DR
CODEC
RTS1
400 Ω
CB
VDD 0.1 µF
RING TRIP
DETECT
PWM
SIGNAL
VDD GNDD
EN
CLK
CB1
CB2
OUT
L7590C
RINGING
GENERATOR
L2
L1
GNDR
VREF
C2
1 µF
VNEG
RX 15 Ω
* CNEG connects to VNEG pin at chip.
RILIM
L1
20 mH
CNEG*
1.0 µF
VNEG
C1
1.0 µF
Figure 2. Basic Battery-Backed Ringing Application
Table 1. Parts List for Application, Ringing Driver IC
Name
L1
C1
C2
CB
Rx
RILIM
Value
20 mH
1 µF, 250 V, 20%
1 µF, 20 V, 20%
0.1 µF, 10 V, 20%
15 Ω, 1 W
20 Ω to 100 Ω
Function
Part of LC output filter
Part of LC output filter
VREF filter
Voltage doubling capacitor
Hot insertion limiter
Current-limiter adjustment
12-3058.E (F)
Lucent Technologies Inc.
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet L7590C.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| L7590C | Telephone Ringing Driver | Agere Systems |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |