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AD8390ACP-REEL7
Low Power, High Output Current Differential Amplifier
Low Power, High Output Current
Differential Amplifier
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-power supply operation from 10 V (±5 V)
up to 24 V (±12 V)
4 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 44.2 V p-p differential output voltage
Low distortion –82 dBc @ 1 MHz second harmonic –91 dBc @ 1 MHz third harmonic
High speed: 300 V/µs differential slew rate
APPLICATIONS
ADSL/ADSL2+ CO and CPE line drivers
xDSL line driver
High current differential amplifiers
GENERAL DESCRIPTION The AD8390 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+. While in full bias operation, the
driver is capable of providing 24.4 dBm output power into low
resistance loads. This is enough to power a 20.4 dBm line while
compensating for losses due to hybrid insertion, transformer
insertion, and back termination resistors.
The AD8390 fully differential amplifier is available in a ther-
mally enhanced lead frame chip scale package (LFCSP-16) and
a 16-lead QSOP/EP. Significant control and flexibility in bias
current have been designed into the AD8390. The four power
modes are controlled by two digital bits, PWDN (1,0) which
provide three levels of driver bias and one powered-down state.
In addition, the IADJ pin can be used for fine quiescent current
trimming to tailor the performance of
the AD8390.
PIN CONFIGURATIONS+IN
DGND
NC = NO CONNECTNCNCNC
IADJ
VOCM
PWDN0
PWDN1
–IN
–OUT
VEE
VCC
+OUT165
Figure 1. 4 mm × 4 mm 16-Lead LFCSP
VOCM
+IN
PWDN1
PWDN0
–IN
DGND
NC = NO CONNECT
–OUT
VEE
VCC
+OUT
IADJ
Figure 2. 16-Lead QSOP/EP
The low power consumption, high output current, high output
voltage swing, and robust thermal packaging enable the AD8390
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.
Rev. C
TABLE OF CONTENTS Specifications.....................................................................................3
Absolute Maximum Ratings............................................................5
Typical Thermal Properties.............................................................5
ESD Caution..................................................................................5
Typical Performance Characteristics.............................................6
Theory of Operation........................................................................9
Applications.......................................................................................9
Circuit Definitions.......................................................................9
Analyzing a Basic Application Circuit.......................................9
Setting the Closed-Loop Gain....................................................9
Calculating Input Impedance.....................................................9
Setting the Output Common-Mode Voltage..........................10
Power-Down Features and the IADJ Pin...................................10
PWDN Pins.............................................................................10
ADSL and ADSL2+ Applications.........................................10
ADSL and ADSL2+ Applications Circuit............................10
Multitone Power Ratio (MTPR)...............................................11
Layout, Grounding, and Bypassing..........................................12
Power Dissipation and Thermal Management.......................12
Outline Dimensions.......................................................................13
Ordering Guide..........................................................................13
REVISION HISTORY
9/04–Data Sheet Changed from Rev. B to Rev. C Change to Ordering Guide............................................................16
2/04–Data Sheet Changed from Rev. A to Rev. B. Changed pub code..........................................................................16
1/04–Data sheet changed from Rev. Sp0f to Rev. A. Added detailed description of product............................Universal
Updated Outline Dimensions.......................................................13
SPECIFICATIONS VS = ±12 V or +24 V, RL = 100 Ω, G = 10, PWDN = (1,1), IADJ = NC, VOCM = float, TA = 25°C, unless otherwise noted.1, 2
Table 1. 1 VOCM bypassed with 0.1 µF capacitor. See . Figure 3
VS = ±5 V or +10 V, RL = 100 Ω, G = 10, PWDN = (1,1), IADJ = NC, VOCM = float, TA = 25°C, unless otherwise noted.1, 2
Table 2. VOCM bypassed with 0.1 µF capacitor.
2 See . Figure 3
ABSOLUTE MAXIMUM RATINGS
Table 3. 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.
TYPICAL THERMAL PROPERTIES
Table 4. 03600-0-003
= 100Ω
RF = 10kΩVOUT,DMFigure 3. Basic Test Circuit
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 Default Conditions: VS = ±12 V or +24 V, RL = 100 Ω, G = 10, PWDN = (1,1), IADJ = NC, VOCM = float (bypassed with 0.1 μF capacitor),
TA = 25°C, unless otherwise noted. See Figure 3.
FREQUENCY (MHz)03600-0-004
Figure 4. Small Signal Frequency Response;
VS = ±12 V, Gain = 10, VOUT = 200 mV p-p
FREQUENCY (MHz)03600-0-006
Figure 5. Large Signal Frequency Response;
VS = ±12 V, Gain = 10, VOUT = 4 V p-p
THROUGH (dB)
FREQUENCY (MHz)
–10110100100003600-0-026
Figure 7. Small Signal Frequency Response;
VS = ±5 V, Gain = 5, VOUT = 200 mV p-p
FREQUENCY (MHz)03600-0-027
–101101001000Figure 8. Large Signal Frequency Response;
VS = ±5 V, Gain = 5, VOUT = 2 V p-p
OUTP
UT I
DANCE
0.010.1110100
OUTPUT POWER (dBm)
MULTITONE POW
R RATIO (dBc)
–50142018162203600-0-010
Figure 10. MTPR vs. Output Power;
970 kHz Empty Bin (26 kHz to 1.1 MHz)
OUTPUT POWER (dBm)R CONS
N (mW
300121614182022
Figure 11. Power Consumption vs. Output Power
(Includes Output Power Delivered to Load)
FREQUENCY (MHz)03600-0-029
TOTAL HARMONI
DI
ORTI
ON (dBc
0.1110Figure 12. Total Harmonic Distortion vs. Frequency;
VS = ±12 V, VOUT = 2 V p-p
OUTPUT POWER (dBm)MULTITONE POW
R RATIO (dBc)
–502220181614
Figure 13. MTPR vs. Output Power;
1.75 MHz Empty Bin (26 kHz to 2.2 MHz)
RLOAD (Ω)DIFFE
NTIAL OUTP
UT S
ING (V2030405060708090100
Figure 14. Differential Output Swing vs. RLOAD
FREQUENCY (MHz)TOTAL HARMONIC DIS
ORTION (dBc
0.1110
Figure 15. Total Harmonic Distortion vs. Frequency;
VS = ±5 V, VOUT = 2 V p-p
IADJ SERIES RESISTOR (Ω)
CURRE
NT (mA)101001k10k100k1M03600-0-016
Figure 16. Quiescent Current vs. IADJ Resistor; VS = ±12 V
TIME (µs)
FFE
NTI
L OUTP
UT (V
PWD
PIN
VA
ES (
–0.2–0.100.10.20.30.40.50.60.70.803600-0-018
Figure 17. Power-Up Time;
PWDN = (0,0) to PWDN = (1,1)
FREQUENCY (Hz)
VOLTA
GE N
ISE (
100100100k1M10k1k10MFigure 18. Voltage Noise (RTI)
IADJ SERIES RESISTOR (Ω)
CURRE
NT (mA)101001k10k100k1M03600-0-017
Figure 19. Quiescent Current vs. IADJ Resistor; VS = ±5 V
TIME (µs)
DIFFE
NTIAL OUTP
UT (V
PWD
PIN
VA
ES (
5.5024681003600-0-019
Figure 20. Power-Down Time;
PWDN = (1,1) to PWDN = (0,0)
FREQUENCY (Hz)
CURRE
NT NOI
(pA/
1001001k10k100k1M10M03600-0-015
Figure 21. Current Noise (RTI)
