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AD8390A
Low Power, High Output Current Differential Amplifier
ANALOG
DEVICES
Low Power, High Output Current
Differential Amplifier
AD8390A
FEATURES
Voltage feedback amplifier
Ideal for ADSL and ADSL2+ central office (CO) and
customer premises equipment (CPE) applications
Enables high current differential applications
Low power operation
Single- or dual-supply operation from 10 V (t 5 MI
up to 24V(112V)
5.5 mA total quiescent supply current for full power ADSL
and ADSL2+ co applications
Adjustable supply current to minimize power
consumption
High output voltage and current drive
400 mA peak output drive current
44 V p-p differential output voltage
Low distortion
-70 dBc MTPR, 26 kHz to 1.1 MHz
-65 dBc MTPR,1.1 MHz to 2.2 MHz
High speed: 260 V/ps differential slew rate
APPLICATIONS
ADSL/ADSL2+ C0 and CPE line drivers
xDSL line drivers
High current differential amplifiers
GENERAL DESCRIPTION
The AD8390A is a high output current, low power consumption
differential amplifier. It is particularly well suited for the central
office (CO) driver interface in digital subscriber line systems
such as ADSL and ADSL2+. In full bias operation, the driver
delivers 20.4 dBm output power into low resistance loads while
compensating for hybrid and transformer insertion losses and
back termination resistors.
The AD8390A is available in a thermally enhanced LFCSP
package (16-lead LFCSP). Significant control and flexibility
in bias current have been designed into the AD8390A.
Four power modes are selectable via two digital inputs, PDO and
Rev. B
Information furnished by Analog Davies is believed to be accurate and reliable. However, no
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license is granted by implication or otherwise under any patent or patent rights of Analog Davies.
Trademarks and registered trademarks arethe prrapertyaf their respective owners.
FUNCTIONAL BLOCK DIAGRAM
Figure l.
PDI, providing three levels of driver bias and one power-down
state. In addition, the IAD, pin is available for fine quiescent
current trimming to tailor the performance of the AD8390A.
The low power consumption, high output current, high output
voltage swing, and robust thermal packaging enable the
AD8390A to be used as the central office line driver in ADSL,
ADSL2+, and proprietary xDSL systems, as well as in other high
current applications requiring a differential amplifier.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781 .329.4700
Fax: 781.461.3113 @201 3 Analog Devices, Inc. All rights reserved.
ADB390A
TABLE OF CONTENTS
Features _............................................................................................. 1 Test Circuits w....................................................................................... 8
Applications _...................................................................................... 1 Theory of Operation w........................................................................ 9
Functional Block Diagram .............................................................. 1 Applications Information .............................................................. 10
General Description _........................................................................ 1 Supplies, Grounding, and Layout ............................................. 10
Revision History ............................................................................... 2 VCOM Pin .................................................................................. 10
Specifications ............................ Power Management ......................... .. 10
Absolute Maximum Ratings P........................................................... 4 ADSL and ADSL2+ Applications ............................................. 11
Thermal Resistance w..................................................................... 4 Lightning and AC Power Fault w................................................ 11
Maximum Power Dissipation w.................................................... 4 Outline Dimensions _...................................................................... 12
ESD Caution .................................................................................. 4 Ordering Guide .......................................................................... 12
Pin Configuration and Function Descriptions ............................. 5
Typical Performance Characteristics M............................................ 6
REVISION HISTORY
2/ 13-Revision B.. Initial Version
Rev. B l Page 2 of12
A08390A
SPECIFICATIONS
Vs = :12 V or Vs = 24 V, R = 100 Q, G = 10, PD(1:O) = (1,1), Lam = NC, VCOM = NC (bypassed with 0.1 " capacitor), TA = 25°C, unless
otherwise noted. Refer to the basic test circuit in Figure 14.
Table 1.
Parameter Conditions Min Typ Max Unit
DYNAMIC PERFORMANCE
-3 dB Small Signal Bandwidth Vour = 0.2 V p-p, RF = 10 k0 38 45 MHz
Large Signal Bandwidth VouT = 4V p-p 35 38 MHz
Peaking Vow: 0.2V p-p 0.1 dB
Slew Rate Vow = 4 V p-p 260 V/ps
NOISE/DISTORTION PERFORMANCE
Multitone Power Ratio (26 kHz to 1.1 MHz) ZLINE = 100 fl, PLINE = 20.4 dBm, -70 dBc
crest factor (CF) = 5.4
Multitone Power Ratio (1.1 MHz to 2.2 MHz) ZLINE = 100 fl, PLINE = 20.4 dBm, -65 dBc
crest factor (CF) = 5.4
Voltage Noise (RTI) f= 10 kHz 5 nV/VHz
INPUT CHARACTERISTICS
RTI Offset Voltage (Vos,DM(RTI)) VINP - VINN, VCOM = midsupply -3.0 t1.0 +3.0 mV
VINP - VINN, VCOM = NC -3.0 $1.0 +3.0 mV
:lnput Bias Current -4.0 -7.0 pA
Input Offset Current -0.35 t0.05 +0.35 yA
Input Resistance 400 k0
Input Capacitance 2 pF
Common-Mode Rejection Ratio (AVOS,DM(RTI))/(AVIN,CM) 58 69 dB
OUTPUT CHARACTERISTICS
Differential Output Voltage Swing AVom 42.8 44 44.6 V
Output Balance Error (AVos,CM)/AVOUT 60 dB
Linear Output Current RL = 10 o, fc = 100 kHz 400 mA
Output Impedance fc = 2 MHz 0.1 n
Output Common-Mode Offset (Vouw + Voum)/2, VCOM = midsupply -75 t35 +75 mV
(VOUTP + VOUTN)/2, VCOM = NC -75 :35 +75 mV
POWER SUPPLY
Operating Range (Dual Supply) t5 :12 V
Operating Range (Single Supply) 10 24 V
Total Quiescent Current, IADJ = VEE PD(1 :0) = (1,1) 5.5 6.5 mA
PD(1:O) = (1,0) 4.0 5.0 mA
PD(1:O) = (0,1) 2.6 3.5 mA
PD(1:O) = (0,0) 0.56 1.0 mA
Total Quiescent Current, IADJ = NC PD(1:O) = (1,1) 10.0 11.0 mA
PD(1:O) = (1,0) 6.7 8.0 mA
PD(1:O) = (0,1) 3.8 5.0 mA
PD(1: )= (0,0) 0.67 1.0 mA
Power Supply Rejection Ratio (PSRR) AVosou/AVs, AVs = tl V, VCOM = midsupply 72 94 dB
PD(1:O) = 0 (Low Logic State) 0.8 V
PD(1:O) = 1 (High Logic State) 1.6 V
Input Voltage Range -11.0 +10.0 V
Input Resistance 28 k0
VCOM Accuracy AVouIcM/AVCOM 0.995 1.0 1.005 V/V
Rev. B l Page 3 of 12
A08390A
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Supply Voltage (VCC -VEE) 26V
VCOM VEE < VCOM < VCC
Package Power Dissipation See Figure 2
Maximum Junction Temperature (T: MAX) 150°C
Operating Temperature Range (TA) -40''C to +85°C
Storage Temperature Range -6S'C to +150°C
Lead Temperature (Soldering, 10 sec) 300°C
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.
THERMAL RESISTANCE
61A is specified in still air with exposed pad soldered to 4-layer
IEDEC test board. (V is specified at the exposed pad.
Table 3. Thermal Resistance
Package Type th, thc Unit
16-Lead LFCSP (CP-16-4) 30.4 16 ''C/W
MAXIMUM POWER DISSIPATION
The maximum safe power dissipation for the AD839OA is
limited by its junction temperature on the die.
The maximum safe junction temperature of plastic encapsu-
lated devices, as determined by the glass transition temperature
of the plastic, is 150°C. Exceeding this limit temporarily may
cause a shift in the parametric performance due to a change in
the stresses exerted on the die by the package. Exceeding this
limit for an extended period can result in device failure.
Figure 2 shows the maximum safe power dissipation in
the package vs. the ambient temperature. 61A values are
approximations.
To = 150°C
2.5 "ss
MAXIMUM POWER DISSIPATION (W)
-25 -15 -5 5 15 25 35 45 55 65 75 85
AMBIENT TEMPERATURE CC)
Figure 2. Maximum Power Dissipation vs. Temperature
The power dissipated in the package (Po) is the sum of the
quiescent power dissipation and the power dissipated in the
package due to the load drive for all outputs. The quiescent
power is the voltage between the supply pins (Vs) times the
quiescent current (Is). Assuming that the load RI. is referenced
to midsupply, the total drive power is Vs/2 x Iom, part of which
is dissipated in the package and part in the load (VOUT y lows).
RMS output voltages should be considered. If RL is referenced to
VEE as in single-supply operation, the total power is Vs X Tour.
In single-supply operation with RL referenced to VEE, the worst
case is Vow = Vs/ 2.
Airflow increases heat dissipation, effectively reducing am. In
addition, more copper in direct contact with the package leads
from PCB traces, through holes, ground, and power planes
reduces 61A.
ESD CAUTION
ESD (electrostatic discharge) sensitive device.
Charged devices and circuit boards can discharge
without detection. Although this product features
patented or proprietary protection circuitry, damage
dt gs may occur on devices subjected to high energy ESD.
Therefore, proper ESD precautions should be taken to
avoid performance degradation or loss of functionality.
Rev. B l Page4of12
AD8390A
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 4. Pin Function Descriptions
ow"- INDICATOR
AD8390A
TOP VIEW
(Not to Scale)
DGND 6
1. NC = NO CONNECT.
2. NO ELECTRICAL CONNECTION. CONNECT THE
EXPOSED PAD TO A SOLID EXTERNAL PLANE
WITH LOW THERMAL RESISTANCE.
Figure 3. Pin Configuration
Pin No. Mnemonic Description
1 INP Amplifier Noninverting Input.
2 PD1 Power Mode Control.
3 PDO Power Mode Control.
4 INN Amplifier Inverting Input.
5 NC No Connection.
6 DGND Ground.
7 IADJ Bias Current Adjustment.
8 NC No Connection.
9 OUTP Amplifier Noninverting Output.
10 VCC Positive Power Supply.
11 VEE Negative Power Supply.
12 OUTN Amplifier Inverting Output.
13 NC No Connection.
14 NC No Connection.
15 VCOM Common-Mode Voltage.
16 NC No Connection.
EPAD Exposed pad. No electrical connection. Connect the exposed pad to a solid external plane with low thermal
resistance.
Rev.B|Page50f12
