Rail-to-Rail Upstream ADSL Line Driver

AD45048


Rev. A
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FEATURES
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 1
–IN1 2
+IN1 3
–V
S
4
+V
S
OUT2
–IN2
+IN2
8
7
6
5
04817-S
p0-001

Figure 1. 8-Lead SOIC
10
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
CENTER 86.31174378kHz 1kHz/ SPAN 10kHz
04817-S
p0-002
dBm
–68dB

Figure 2. AD45048AR Upstream ADSL MTPR (13 dBm, CF = 5.3)