ad45048 Analog Devices, Inc., ad45048 Datasheet

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ad45048

Manufacturer Part Number
ad45048
Description
Rail-to-rail Upstream Adsl Line Driver
Manufacturer
Analog Devices, Inc.
Datasheet

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FEATURES
Dual op amp
Voltage feedback
Wide supply range: from 3.3 V to 24 V
Rail-to-rail output
High output current
Linear output current of 230 mA peak into 25 Ω
−68 dBc MTPR @ 15 dBm (100 Ω telephone line)
Low noise
High speed
APPLICATIONS
Consumer xDSL modems
Twisted pair line drivers
ADSL CPE applications
Audio applications
GENERAL DESCRIPTION
The AD45048 ADSL CPE line driver is a dual operational
amplifier capable of driving high output current (230 mA); it
features a rail-to-rail output stage that swings to within 0.5 V
of the supply rails. The AD45048 rail-to-rail output stage
surpasses the output voltage capability of typical emitter-
follower output stages and can deliver up to 23 V p-p
differentially from a single 12 V supply in ADSL CPE line
driving applications. The low distortion, high output current
and wide output dynamic range make the AD45048 ideal for
driving upstream signals in ADSL CPE applications.
Fabricated with ADI’s high speed XFCB-HV (eXtra Fast
Complementary Bipolar-High Voltage) process, the high
bandwidth and fast slew rate of the AD45048 keep distortion to
a minimum while dissipating minimum power. The AD45048 is
available in a standard 8-lead SOIC package that can operate
from −40°C to +85°C.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
Output swing to within 0.5 V of supply rails @ 230 mA
23 V p-p differential, R
4.5 nV/√Hz voltage noise density @ 100 kHz
1.5 pA/√Hz current noise density @ 100 kHz
65 MHz bandwidth (A
55 V/μs slew rate (R
(Drop in replacement for TS613ID and EL1519CS)
LOAD
V
LOAD
= 1, −3 dB)
= 25 Ω)
of 50 Ω from 12 V supply
Rail-to-Rail Upstream ADSL Line Driver
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Figure 2. AD45048AR Upstream ADSL MTPR (13 dBm, CF = 5.3)
–10
–20
–30
–40
–50
–60
–70
–80
–90
10
0
CENTER 86.31174378kHz
OUT1
PIN CONFIGURATION
–IN1
+IN1
–V
S
© 2005 Analog Devices, Inc. All rights reserved.
Figure 1. 8-Lead SOIC
1
2
3
4
1kHz/
–68dB
8
7
6
5
+V
OUT2
–IN2
+IN2
S
AD45048
www.analog.com
SPAN 10kHz

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ad45048 Summary of contents

Page 1

... OUT1 –IN1 +IN1 – –10 –20 –30 –40 –50 –60 –70 –80 –90 CENTER 86.31174378kHz Figure 2. AD45048AR Upstream ADSL MTPR (13 dBm 5.3) One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 AD45048 + OUT2 2 7 –IN2 3 6 +IN2 ...

Page 2

... AD45048 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Pin Configuration............................................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Typical Performance Characteristics ............................................. 5 REVISION HISTORY 9/05—Rev Rev. A Updated Outline Dimensions ......................................................... 8 Changes to Ordering Guide ............................................................ 8 7/04—Revision 0: Initial Version General Description..........................................................................7 Power Supply and Decoupling.....................................................7 Layout Considerations..................................................................7 CPE ADSL Application ...

Page 3

... LINE 4.5 1.5 1 2.5 1 200 1 1.4 0 Ω differential 11.25 11 Ω differential −11.5 22.5 23 5.68 5.76 −5.67 5.92 5.95 −5.91 ±1 −85 −86 AD45048 Max Unit MHz MHz MHz V/μs dBc dBc nV/√Hz pA/√Hz 2 2.0 mV 900 nA μA 300 nA dB kΩ pF Ω V diff −11.25 V diff V p −5. ...

Page 4

... AD45048 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Rating Supply Voltage 26.4 V Power Dissipation (T JMAX Storage Temperature −65°C to +125°C Operating Temperature Range −40°C to +85°C Lead Temperature Range 300°C (Soldering 10 sec) Junction Temperature 150°C ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection ...

Page 5

... IN V+ 12.5Ω 1 OUT 3 U1A AD45048 + 12.5Ω OUT 499Ω 6 V– –V U1B IN AD45048 4 R5 3kΩ Figure 8. Differential Test Circuit for MTPR AD45048 499Ω – + 25Ω 100M 1G 5kΩ – + 25Ω 100M 1G R3 TX1 R3 100Ω 1:2 ...

Page 6

... AD45048 100 100 1k 10k 100k FREQUENCY (Hz) Figure 9. Voltage Noise vs. Frequency –20 –40 –60 SECOND –80 –100 THIRD –120 OUTPUT VOLTAGE (p-p) Figure 10. Single-Ended Harmonic Distortion 499 Ω 100 Ω Ω, Fundamental Frequency = 40 kHz 2V/DIV M 5.00μ ...

Page 7

... In the simplified differential driver circuit shown in Figure 8, the AD45048 is driving a 25 Ω impedance reflected by 1:2 step-up transformer. R3 and R6 are 12.5 Ω each and are back-termination or load-matching ...

Page 8

... AD45048AR-REEL −40°C to +85°C AD45048AR-REEL7 −40°C to +85°C 1 AD45048ARZ −40°C to +85°C 1 AD45048ARZ-REEL −40°C to +85°C 1 AD45048ARZ-REEL7 −40°C to +85° Pb-free part. © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. ...

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