Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsLinear IC - Op-amp Voltage feedback SOIC 8 EP

Rail-to-Rail, High Output

Current Amplifier

AD8397

Rev. A

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FEATURES

Dual operational amplifier

Voltage feedback

Wide supply range from 3 V to 24 V

Rail-to-rail output

Output swing to within 0.5 V of supply rails

High linear output current

310 mA peak into 32 Ω on ±12 V supplies while maintaining

−80 dBc SFDR

Low noise

4.5 nV/√Hz voltage noise density at 100 kHz

1.5 pA/√Hz current noise density at 100 kHz

High speed

69 MHz bandwidth (G = 1, −3 dB)

53 V/μs slew rate (R

LOAD

= 25 Ω)

APPLICATIONS

Twisted-pair line drivers

Audio applications

General-purpose ac applications

GENERAL DESCRIPTION

The AD8397 comprises two voltage feedback operational amplifiers

capable of driving heavy loads with excellent linearity. The

common-emitter, rail-to-rail output stage surpasses the output

voltage capability of typical emitter-follower output stages and

can swing to within 0.5 V of either rail while driving a 25 Ω

load. The low distortion, high output current, and wide output

dynamic range make the AD8397 ideal for applications that

require a large signal swing into a heavy load.

Fabricated with Analog Devices, Inc., high speed extra fast

complementary bipolar high voltage (XFCB-HV) process, the

high bandwidth and fast slew rate of the AD8397 keep distortion to

a minimum. The AD8397 is available in a standard 8-lead SOIC_N

package and, for higher power dissipating applications, a thermally

enhanced 8-lead SOIC_N_EP package. Both packages can operate

from −40°C to +85°C.

PIN CONFIGURATION

OUT1

–IN1

+IN1

–V

OUT2

–IN2

+IN2

05069-001

Figure 1. 8-Lead SOIC

1.50

–1.50

–1.25

–1.00

–0.75

–0.50

–0.25

0.25

0.50

0.75

1.00

1.25

0 2 4 6 8 101214161820

05069-031

TIME (µs)

OUT

(V)

Figure 2. Output Swing, V

= ±1.5 V, R

= 25 Ω

–12

–9

–6

–3

0 2 4 6 8 101214161820

05069-032

TIME (µs)

OUT

(V)

Figure 3. Output Swing, V

= ±12 V, R

= 100 Ω

Summary of content (16 pages)

PAGE 1
Rail-to-Rail, High Output Current Amplifier AD8397 PIN CONFIGURATION OUT1 1 8 +VS –IN1 2 7 OUT2 +IN1 3 6 –IN2 –VS 4 5 +IN2 Figure 1. 8-Lead SOIC 1.50 1.25 1.00 0.75 0.50 VOUT (V) Dual operational amplifier Voltage feedback Wide supply range from 3 V to 24 V Rail-to-rail output Output swing to within 0.5 V of supply rails High linear output current 310 mA peak into 32 Ω on ±12 V supplies while maintaining −80 dBc SFDR Low noise 4.5 nV/√Hz voltage noise density at 100 kHz 1.
PAGE 2
AD8397 TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................8 Applications....................................................................................... 1 Applications Information .............................................................. 11 General Description .........................................................................
PAGE 3
AD8397 SPECIFICATIONS VS = ±1.5 V or +3 V (at TA = 25°C, G = +1, RL = 25 Ω, unless otherwise noted) 1 . Table 1. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth 0.1 dB Flatness Large Signal Bandwidth Slew Rate NOISE/DISTORTION PERFORMANCE Distortion (Worst Harmonic) Input Voltage Noise Input Current Noise DC PERFORMANCE Input Offset Voltage Test Conditions/Comments Min MHz MHz MHz V/μs fC = 100 kHz, VOUT = 1.4 V p-p, G = +2 f = 100 kHz f = 100 kHz −90 4.5 1.5 dBc nV/√Hz pA/√Hz 81 1.0 2.5 1.0 200 1.
PAGE 4
AD8397 VS = ±2.5V or +5 V (at TA = 25°C, G = +1, RL = 25 Ω, unless otherwise noted) 1 . Table 2. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth 0.1 dB Flatness Large Signal Bandwidth Slew Rate NOISE/DISTORTION PERFORMANCE Distortion (Worst Harmonic) Input Voltage Noise Input Current Noise DC PERFORMANCE Input Offset Voltage Test Conditions/Comments Min MHz MHz MHz V/μs fC = 100 kHz, VOUT = 2 V p-p, G = +2 f = 100 kHz f = 100 kHz −98 4.5 1.5 dBc nV/√Hz pA/√Hz 85 1.0 2.5 1.0 200 1.
PAGE 5
AD8397 VS = ±5 V or +10 V (at TA = 25°C, G = +1, RL = 25 Ω, unless otherwise noted) 1 . Table 3. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth 0.1 dB Flatness Large Signal Bandwidth Slew Rate NOISE/DISTORTION PERFORMANCE Distortion (Worst Harmonic) Input Voltage Noise Input Current Noise DC PERFORMANCE Input Offset Voltage Test Conditions/Comments Min MHz MHz MHz V/μs fC = 100 kHz, VOUT = 6 V p-p, G = +2 f = 100 kHz f = 100 kHz −94 4.5 1.5 dBc nV/√Hz pA/√Hz 85 1.0 2.5 1.0 200 1.
PAGE 6
AD8397 VS = ±12 V or +24 V (at TA = 25°C, G = +1, RL = 25 Ω, unless otherwise noted) 1 . Table 4. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth 0.1 dB Flatness Large Signal Bandwidth Slew Rate NOISE/DISTORTION PERFORMANCE Distortion (Worst Harmonic) Input Voltage Noise Input Current Noise DC PERFORMANCE Input Offset Voltage Test Conditions/Comments Min MHz MHz MHz V/μs fC = 100 kHz, VOUT = 20 V p-p, G = +5 f = 100 kHz f = 100 kHz −84 4.5 1.5 dBc nV/√Hz pA/√Hz 90 1.0 2.5 1.0 200 1.
PAGE 7
AD8397 ABSOLUTE MAXIMUM RATINGS MAXIMUM POWER DISSIPATION Table 5. Parameter Supply Voltage Power Dissipation1 Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering, 10 sec) Junction Temperature Rating 26.4 V See Figure 4 −65°C to +125°C −40°C to +85°C 300°C 150°C The maximum power that can be dissipated safely by the AD8397 is limited by the associated rise in junction temperature.
PAGE 8
AD8397 TYPICAL PERFORMANCE CHARACTERISTICS 100 0 VOUT 80 –10 60 –20 –30 VIN 20 CMRR (dB) 0 –20 OUT 1 –40 OUT 2 –50 –60 –40 –70 05069-029 –60 –80 –100 0 20 40 60 80 100 120 TIME (ns) 140 160 180 05069-005 OUTPUT (mV) 40 –80 –90 0.01 200 Figure 5. Small Signal Pulse Response (G = +1, VS = ±5 V, RL = 25 Ω) 0.1 1 FREQUENCY (MHz) 10 100 Figure 8. Common-Mode Rejection (CMRR) vs.
PAGE 9
AD8397 10 10 G = +1 0 NORMALIZED GAIN (dB) G = +2 –10 G = +10 –20 G = +1 G = +2 –10 –20 G = +10 –30 05069-008 –30 –40 0.01 0.1 1 10 FREQUENCY (MHz) –40 0.01 100 Figure 11. Small Signal Frequency Response for Various Gains (VS = ±5 V, VO = 0.1 V p-p, RL = 25 Ω) 05069-011 NORMALIZED GAIN (dB) 0 0.1 1 10 FREQUENCY (MHz) 100 Figure 14.
PAGE 10
AD8397 –40 0 –10 –50 –20 –60 –40 DISTORTION (dBc) –50 –60 –70 –80 SECOND HARMONIC –90 –70 –80 –90 SECOND HARMONIC –100 –100 –120 0.01 0.1 1 FREQUENCY (MHz) –120 0 10 1 2 3 4 5 6 7 OUTPUT VOLTAGE (V p-p) 8 9 10 Figure 20. Distortion vs. Output Voltage @ 100 kHz, (VS = ±5 V, G = +2, RL = 25 Ω) –40 –40 –50 –50 –60 –60 DISTORTION (dBc) –70 –80 SECOND HARMONIC –90 –100 –70 –80 SECOND HARMONIC –90 –100 THIRD HARMONIC –120 0 –120 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.
PAGE 11
AD8397 APPLICATIONS INFORMATION The AD8397 is a voltage feedback operational amplifier that features an H-bridge input stage and common-emitter, rail-to-rail output stage. The AD8397 can operate from a wide supply range, ±1.5 V to ±12 V. When driving light loads, the rail-to-rail output is capable of swinging to within 0.2 V of either rail. The output can also deliver high linear output current when driving heavy loads, up to 310 mA into 32 Ω while maintaining −80 dBc SFDR.
PAGE 12
AD8397 CAPACITIVE LOAD DRIVE 220pF 270pF –5 330pF –15 –20 –25 –30 –35 0.1 1 10 FREQUENCY (MHz) 100 Figure 24. Capacitive Load Peaking with 2.2 Ω Series Resistor –5 150pF –10 100pF –15 –20 –25 –30 05069-021 GAIN (dB) 470pF –10 –40 0.01 270pF 0 –35 –40 0.01 390pF 0 05069-030 5 5 GAIN (dB) When driving capacitive loads, many high speed operational amplifiers exhibit peaking in their frequency response.
PAGE 13
AD8397 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 1 5 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) 6.20 (0.2441) 5.80 (0.2284) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) COPLANARITY 0.10 SEATING PLANE 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.
PAGE 14
AD8397 NOTES Rev.
PAGE 15
AD8397 NOTES Rev.