|
|
PDF DRV1101 Data sheet ( Hoja de datos )
| Número de pieza | DRV1101 | |
| Descripción | HIGH POWER DIFFERENTIAL LINE DRIVER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de DRV1101 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
|
No Preview Available !
®
DRV1101
DRV1101
HIGH POWER DIFFERENTIAL LINE DRIVER
FEATURES
q HIGH OUTPUT CURRENT: 230mA
q SINGLE SUPPLY OPERATION: 5V
q 10MHz BANDWIDTH: 6Vp-p into 15Ω
q VERY LOW THD AT HIGH POWER:
–81dBc at 6Vp-p, 100kHz, 100Ω
q FIXED DIFFERENTIAL GAIN: 3V/V
APPLICATIONS
q DSL TWISTED PAIR LINE DRIVER
q COMMUNICATIONS LINE DRIVER
q TWISTED-PAIR CABLE DRIVER
DESCRIPTION
The DRV1101 is fixed gain differential line driver
designed for very low distortion operation when driv-
ing DSL line transformers. It is designed for use as the
upstream line driver for ADSL G.Lite, and as both
upstream and downstream line drivers in CAP sys-
tems. Operating on a single 5V supply, the DRV1101
can supply up to 230mA peak output current. The
output voltage can swing up to 9.5Vp-p on a single 5V
supply. In ADSL G.Lite applications, DRV1101 can
supply up to 10dBm average line power with a crest
factor of 5.3 for a peak line power delivered of
approximately 25dBm. It is packaged in a 8-lead
SOIC.
+5V
DRV1101
Out+ 4Ω
In+
G = 3V/V
4Ω Protection
100Ω
In–
Patent
Out–
1:3.3
Pending
Transformer
GND
SBWS009
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1998 Burr-Brown Corporation
PDS-1462A
Printed in U.S.A. July, 1998
1 page  
+5V
DRV1101
Out+
4Ω
In+
4Ω
In–
Out–
GND
Impedance Matching
Resistors
Protection Circuits
1:3.3
Transformer
Line Impedance
100Ω
FIGURE 3. Typical Digital Subscriber Line Application.
To calculate the amplifier requirements for a DSL applica-
tion:
1. Determine the average power that must be delivered to
the line. The amplifier must deliver twice this power to
account for the power dissipated in the series impedance
matching resistors. Therefore, add 3dB to the line power.
This is the average power delivered at the output of the
amplifier. For ADSL G.Lite (as of June 1998), the aver-
age line power is 10dBm. Adding 3dB results in an
average power at the amplifier output of 13dBm.
2. Next add the power crest factor needed for the line code
used. The power crest factor for ADSL is 15dB which
means that the peak power (PPEAK) needed at the ampli-
fier output is 28dBm (13dBm +15dB). 28dBm is 631mW.
3. The DRV1101 peak output voltage is calculated by the
formula: VPEAK = (PPEAK • RL)1/2 where RL is the load
impedance that the DRV1101 must drive. For ADSL
Lite, using the circuit shown in Figure 3, VPEAK = (PPEAK
• RL)1/2 = (.631W x 17Ω)1/2 = 3.3V. The peak-to-peak
voltage out of the DRV1101 is 2 x 3.3V = 6.6V.
4. The transformer turns ratio can be changed to keep the
required output voltage and current within the range of the
DRV1101. The line impedance (RLINE) is 100Ω for ADSL.
The impedance that is reflected to the DRV1101 side of
the transformer is RLINE/(turns ratio)2. For best power
transfer, the total of the impedance matching resistors
should equal the reflected impedance. Thus, for the circuit
shown in Figure 3, the reflected impedance is 100Ω/(3.4)2
= 8.6Ω. With two impedance matching resistors of 4Ω
each and about 0.5Ω transformer resistance, the total load
impedance is about (8.6Ω + 4Ω + 4Ω + 0.5Ω) = 17Ω.
OUTPUT PROTECTION
Figure 3 also shows overvoltage and short circuit protection
elements that are commonly included in DSL applications.
Overvoltage suppressors include diodes or MOV’s. The
outputs of the DRV1101 can be momentarily shorted to
ground or to the supply without damage. The outputs are not,
however, designed for a continuous short to ground or the
supply.
POWER DISSIPATION AND THERMAL ANALYSIS
The total internal power dissipation of the DRV1101 is the
sum of a fixed overhead power that is independent of the
load plus the power dissipated internally to deliver the
average load power. The total internal power dissipation
determines the internal temperature rise when in operation.
For DSL applications with high crest factors, such as ADSL,
the average load power delivered is much lower than the
peak power required. For practical purposes, this means that
internal temperature rise is not an issue for the DRV1101 in
high-crest factor DSL applications.
With a +5V supply, the DRV1101’s typical fixed overhead
current of 22mA (out of total no-load supply current of
29mA) creates a fixed overhead power dissipation of 110mW.
The load dependent power dissipation of the DRV1101
when delivering an output voltage Vrms to a load RL is:
P = (VDD – Vrms) • (Vrms/RL)
The internal power dissipation will reach a maximum when
Vrms is equal to VDD/2. For a sinusoidal output, this
corresponds to an output Vp-p = 1.41 • VDD.
As an example, compute the power and junction temperature
under a worst case condition with VDD = +5V and Vrms = 2.5V
into a 20Ω differential load. The total internal power dissipation
would be:
(110mW) + (5V – 2.5V) • (2.5V/20Ω) = 423mW
Fixed
5
Load Related
DRV1101
®
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet DRV1101.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| DRV110 | Integrated Supply Regulation (Rev. C) |  Texas Instruments |
| DRV1100 | HIGH POWER DIFFERENTIAL DRIVER AMPLIFIER | Burr-Brown Corporation |
| DRV1100 | High Power Differential Driver Amplifier | Texas Instruments |
| DRV1101 | HIGH POWER DIFFERENTIAL LINE DRIVER | Burr-Brown Corporation |
| 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 |