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AD45048ARZ-AD45048ARZ-REEL-AD45048ARZ-REEL7
Rail-to-Rail Upstream ADSL Line Driver
Rail-to-Rail Upstream ADSL Line DriverFEATURES
Dual op amp
Voltage feedback
Wide supply range: from 3.3 V to 24 V
Rail-to-rail output
Output swing to within 0.5 V of supply rails @ 230 mA
23 V p-p differential, RLOAD of 50 Ω from 12 V supply
High output current
Linear output current of 230 mA peak into 25 Ω
−68 dBc MTPR @ 15 dBm (100 Ω telephone line)
Low noise
4.5 nV/√Hz voltage noise density @ 100 kHz
1.5 pA/√Hz current noise density @ 100 kHz
High speed
65 MHz bandwidth (AV = 1, −3 dB)
55 V/μs slew rate (RLOAD = 25 Ω)
APPLICATIONS
Consumer xDSL modems
Twisted pair line drivers
ADSL CPE applications
(Drop in replacement for TS613ID and EL1519CS)
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.
PIN CONFIGURATION
OUT1
–IN1
+IN1
–VS
+VS
OUT2
–IN2
+IN204817-S
p0-001
Figure 1. 8-Lead SOIC
CENTER 86.31174378kHz1kHz/SPAN 10kHz04817-S
p0-002
dBmFigure 2. AD45048AR Upstream ADSL MTPR (13 dBm, CF = 5.3)
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
General Description..........................................................................7
Power Supply and Decoupling.....................................................7
Layout Considerations..................................................................7
CPE ADSL Application................................................................7
Transformer Selection..................................................................7
Receive Channel Considerations.................................................7
Outline Dimensions..........................................................................8
Ordering Guide.............................................................................8
REVISION HISTORY
9/05—Rev. 0 to Rev. A Updated Outline Dimensions.........................................................8
Changes to Ordering Guide............................................................8
7/04—Revision 0: Initial Version
SPECIFICATIONS VS = ±6 V or +12 V (@ TA = 25°C, G = +10, RL = 100 Ω, unless otherwise noted).
Table 1. ABSOLUTE MAXIMUM RATINGS
Table 2. Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
1 θJA = 112.7°C/W for SOIC package in still air based on 2S2P JEDEC PCB.
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. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
TYPICAL PERFORMANCE CHARACTERISTICS
10k100k1M10M1G100M04817-S
p0-017
GAIN (
FREQUENCY (Hz)Figure 3. Noninverting Small Signal Bandwidth
(VS = ±6 V, VO = 0.1 V p-p, RL = 25 Ω)
10k100k1M10M100M1G04817-S
p0-025
GAIN (
FREQUENCY (Hz)Figure 4. Inverting Small Signal Bandwidth
(VS = ±6 V, VO = 0.1 V p-p, RL = 25 Ω)
–50510152004817-S
p0-027
MTP
dBm (100Ω)
10k100k1M10M100M1G04817-S
p0-026
GAIN (
FREQUENCY (Hz)Figure 6. Noninverting Large Signal Bandwidth
(VS = ±6 V, VO = 1 V p-p, RL = 25 Ω)
10k100k1M10M100M1G04817-S
p0-018
GAIN (
FREQUENCY (Hz)Figure 7. Inverting Large Signal Bandwidth
(VS = ±6 V, VO = 1 V p-p, RL = 25 Ω)
04817-S
p0-014
+VIN3kΩ
–VIN
TX1
1:2100Ω+6V1001001k10k100k1M10M100M
VOLTA
GE N
OISE (
V/ H
FREQUENCY (Hz) Figure 9. Voltage Noise vs. Frequency, VS = ±6 V
135792468101104817-S
p0-028
DISTORTION (
Bc)
OUTPUT VOLTAGE (p-p)Figure 10. Single-Ended Harmonic Distortion, VS = ±6 V dc, G = +6,
RF = 499 Ω, RG = 100 Ω, RL = 25 Ω, Fundamental Frequency = 40 kHz
04817-S
p0-029
M 5.00μs Figure 11. Discrete Multitone Modulation Overdrive Recovery
(See Schematic in Figure 8)
1001001k10k100k1M10M04817-S
p0-020
CURRE
NT NOIS
(pA/ Hz)
FREQUENCY (Hz) Figure 12. Input Current Noise vs. Frequency, VS = ±6 V
10k100k1M10M100M04817-S
p0-030
OUTP
UT IMDE
DANCE
FREQUENCY (Hz) Figure 13. Output Impedance vs. Frequency
04817-S
p0-031
M 100ns Figure 14. Small Signal Pulse Response RLOAD = 1 kΩ, RFB = 500 Ω
