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Analog Devices Semiconductor Electronic Components Datasheet

AD8391 Datasheet

xDSL Line Driver

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a
FEATURES
Ideal xDSL Line Driver for VoDSL or Low Power
Applications such as USB, PCMCIA, or PCI Based
Customer Premise Equipment (CPE)
High Output Voltage and Current Drive
340 mA Output Drive Current
Low Power Operation
3 V to 12 V Power Supply Range
1-Pin Logic Controlled Standby, Shutdown
Low Supply Current of 19 mA (Typical)
Low Distortion
–82 dBc SFDR, 12 V p-p into Differential 21 @ 100 kHz
4.5 nV/Hz Input Voltage Noise Density, 100 kHz
Out-of-Band SFDR = –72 dBc, 144 kHz to 500 kHz,
ZLINE = 100 , PLINE = 13.5 dBm
High Speed
40 MHz Bandwidth (–3 dB)
375 V/s Slew Rate
APPLICATIONS
VoDSL Modems
xDSL USB, PCI, PCMCIA Cards
Line Powered or Battery Backup xDSL Modems
xDSL Line Driver
3 V to 12 V with Power-Down
AD8391
PIN CONFIGURATION
8-Lead SOIC
(Thermal Coastline)
IN1 1
PWDN 2
+VS 3
VOUT1 4
؊VS
VMID
؉VS
؊؉
؉؊
AD8391
8 IN2
7 VMID
6 –VS
5 VOUT2
PRODUCT DESCRIPTION
The AD8391 consists of two parallel, low cost xDSL line drive
amplifiers capable of driving low distortion signals while running on
both 3 V to 12 V single-supply or equivalent dual-supply rails. It is
primarily intended for use in single-supply xDSL systems where low
power is essential, such as line powered and battery backup systems.
Each amplifier output drives more than 250 mA of current while
maintaining 82 dBc of SFDR at 100 kHz on 12 V, outstanding
performance for any xDSL CPE application.
The AD8391 provides a flexible power-down feature consisting of
a 1-pin digital control line. This allows biasing of the AD8391 to
full power (Logic 1), standby (Logic three-state maintains low
amplifier output impedance), and shutdown (Logic 0 places
amplifier outputs in a high impedance state). PWDN is refer-
enced to VS.
Fabricated on ADIs high speed XFCB process, the high bandwidth
and fast slew rate of the AD8391 keep distortion to a minimum,
while dissipating a minimum of power. The quiescent current of the
AD8391 is low: 19 mA total static current draw. The AD8391
comes in a compact 8-lead SOIC thermal coastlinepackage and
operates over the temperature range 40°C to +85°C.
EMPTY BIN
25
137.5
250
FREQUENCY – kHz
Figure 1. Upstream Transit Spectrum with Empty Bin
at 45 kHz; Line Power = 12.5 dBm into 100
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. 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD8391 Datasheet

xDSL Line Driver

No Preview Available !

AD8391–SPECIFICATIONS (@ 25؇C, VS = 12 V, RL = 10 , VMID = VS/2, G = –2, RF = 909 , RG = 453 ,
unless otherwise noted. See TPC 1 for Basic Circuit Configuration.)
Parameter
DYNAMIC PERFORMANCE
3 dB Bandwidth
0.1 dB Bandwidth
Large Signal Bandwidth
Slew Rate
Rise and Fall Time
Settling Time
NOISE/HARMONIC
PERFORMANCE
Distortion, G = 5 (RG = 178 )
Second Harmonic
Third Harmonic
MTPR (In-Band)
SFDR (Out-of-Band)
Input Noise Voltage
Input Noise Current
Crosstalk
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Match
Transimpedance
INPUT CHARACTERISTICS
Input Resistance
Input Bias Current
Input Bias Current Match
CMRR
Input CM Voltage Range
VMID Accuracy
VMID Input Resistance
VMID Input Capacitance
OUTPUT CHARACTERISTICS
Output Resistance
Output Resistance
Output Voltage Swing
Linear Output Current
Short-Circuit Current
POWER SUPPLY
Supply Current
STBY Supply Current
SHUTDOWN Supply Current
Operating Range
Power Supply Rejection Ratio
LOGIC INPUT (PWDN)
Logic 1 Voltage
Logic 0 Voltage
Logic Input Bias Current
Turn-On Time
Specifications subject to change without notice.
Conditions
G = 1, VOUT < 0.4 V p-p, RG = 909
G = 2, VOUT < 0.4 V p-p
VOUT < 0.4 V p-p
VOUT = 4 V p-p
VOUT = 4 V p-p
VOUT = 4 V p-p
0.1%, VOUT = 2 V p-p
Min Typ
40
38
4
50
375
8
60
Max
VOUT = 8 V p-p (Differential)
100 kHz, RL = 21
100 kHz, RL = 21
25 kHz to 138 kHz, RL = 21
144 kHz to 500 kHz, RL = 21
f = 100 kHz Differential
f = 100 kHz
f = 1 MHz, G = 2, Output to Output
82
95
70
72
4.5
9
64
VMID = +VS/2
TMIN to TMAX
VMID = Float
TMIN to TMAX
VOUT = 5 V
In1, In2 pins
In1 In2
VMID = VIN = 5.5 V to 6.5 V, VOS /VIN, cm
VMID = Float Delta from +VS/2
±2
±3
±2
± 0.25
± 0.35
10
± 15
± 2.6
125
2.5 10
± 0.5 ± 6
48
1.2 to 10.8
± 5 ± 30
2.5
10
Frequency = 100 kHz, PWDN 1
Frequency = 100 kHz, PWDN 0
RLOAD = 100
SFDR < 75 dBc, f = 100 kHz, RL = 21
0.1
0.3
3
340
1500
11.9
PWDN = 1
TMIN to TMAX
PWDN = Open or Three-State
PWDN = 0
Single Supply
VMID = VS /2, VS = ± 0.5 V
RL = 21 , IS = 90% of Typical
16 19
22
10
4
3.0
55
VS + 2.0
± 300
200
21
6
12
VS + 0.8
Unit
MHz
MHz
MHz
MHz
V/µs
ns
ns
dBc
dBc
dBc
dBc
nV/Hz
pA/Hz
dB
mV
mV
mV
mV
mV
M
µA
µA
dB
V
mV
k
pF
k
V
mA
mA
mA
mA
mA
mA
V
dB
V
V
µA
ns
2REV. A


Part Number AD8391
Description xDSL Line Driver
Maker Analog Devices
PDF Download

AD8391 Datasheet PDF






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