ANALOG DEVICES AD8597, AD8599 Service Manual

Single and Dual, Ultralow

FEATURES

Low noise: 1.1 nV/√Hz at 1 kHz Low distortion: −120 dB THD @ 1 kHz Input noise, 0.1 Hz to 10 Hz: <76 nV p-p Slew rate: 14 V/μs Wide bandwidth: 10 MHz Supply current: 4.8 mA/amp typical Low offset voltage: 10 μV typical CMRR: 120 dB Unity-gain stable ±15 V operation

APPLICATIONS

Professional audio preamplifiers ATE/precision testers Imaging systems Medical/physiological measurements Precision detectors/instruments Precision data conversion
Distortion, Ultralow Noise Op Amps
AD8597/AD8599

PIN CONFIGURATIONS

1
NC
AD8597
–IN
2
+IN
3
TOP VIEW
(Not to S cale)
V–
4
NC = NO CONNECT
Figure 1. AD8597 8-Lead SOIC (R-8)
1
NC
2
–IN +IN
V–
NOTES
1. NC = NO CONNECT.
2. IT I S RECOMMENDED T HAT THE EXPOSED PAD BE CONNECTED TO V–.
3 4
AD8597
TOP VIEW
Figure 2. AD8597 8-Lead LFCSP (CP-8-2)
PIN 1 INDICATOR
8 7 6 5
NC V+ OUT NC
8NC 7V+ 6OUT 5NC
06274-060
06274-061

GENERAL DESCRIPTION

The AD8597/AD8599 are very low noise, low distortion opera­tional amplifiers ideal for use as preamplifiers. The low noise of
1.1 nV/√Hz and low harmonic distortion of −120 dB (or better) at audio bandwidths give the AD8597/AD8599 the wide dynamic range necessary for preamplifiers in audio, medical, and instru­mentation applications. The excellent slew rate of 14 V/μs and 10 MHz gain bandwidth make them highly suitable for medical applications. The low distortion and fast settling time make them ideal for buffering of high resolution data converters.
OUT A
–IN A +IN A
–V
1
AD8599
2 3
TOP VIEW
(Not to S cale)
4
8 7 6 5
+V OUT B –IN B +IN B
06274-054
Figure 3. AD8599 8-Lead SOIC (R-8)
The AD8597 is available in 8-lead SOIC and LFCSP packages, while the AD8599 is available in an 8-lead SOIC package. They are both specified over a −40°C to +125°C temperature range. The AD8597 and AD8599 are members of a growing series of low noise op amps offered by Analog Devices, Inc., (see Tabl e 1).
Table 1. Low Noise Op Amps
Package 0.9 nV 1.1 nV 1.8 nV 2.8 nV 3.8 nV
Single AD797 AD8597 ADA4004-1 AD8675 AD8671 Dual AD8599 ADA4004-2 AD8676 AD8672 Quad ADA4004-4 AD8674
Rev. C
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. Specifications subject to change without notice. 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: 781.461.3113 ©2007–2009 Analog Devices, Inc. All rights reserved.
AD8597/AD8599

TABLE OF CONTENTS

Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
Power Sequencing ........................................................................ 5

REVISION HISTORY

12/09—Rev. B to Rev. C
Changes to Table 1 ............................................................................ 1
10/08—Rev. A to Rev. B
Added AD8597 ................................................................... Universal
Added LFCSP_VD ............................................................. Universal
Added Table 1 .................................................................................... 1
Changes to Specifications Section .................................................. 3
Changes to Absolute Maximum Ratings Section ......................... 5
Changes to Typical Performance Characteristics Section ........... 6
Added Figure 12 and Figure 15....................................................... 7
Added Figure 18 and Figure 19....................................................... 8
Added Figure 30 and Figure 33..................................................... 10
Added Figure 34 to Figure 38 ........................................................ 11
Added Figure 42 and Figure 45..................................................... 12
Added Figure 52, Figure 55, Figure 57 ......................................... 14
Added Functional Operation Section .......................................... 15
Added Figure 58 .............................................................................. 15
Updated Outline Dimensions ....................................................... 17
Changes to Ordering Guide .......................................................... 17
ESD Caution...................................................................................5
Typical Performance Characteristics ..............................................6
Functional Operation..................................................................... 15
Input Voltage Range ................................................................... 15
Output Phase Reversal ............................................................... 15
Noise and Source Impedance Considerations ........................... 15
Outline Dimensions ....................................................................... 17
Ordering Guide .......................................................................... 17
4/07—Rev. 0 to Rev. A
Updated Layout ................................................................................. 5
Changes to Figure 45 Caption ...................................................... 12
Added Figure 48 ............................................................................. 12
Changes to Figure 51 Caption ...................................................... 13
2/07—Revision 0: Initial Version
Rev. C | Page 2 of 20
AD8597/AD8599

SPECIFICATIONS

VSY = ±5 V, VCM = 0 V, VO = 0 V, TA = 25°C, unless otherwise specified.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage V
OS
−40°C TA ≤ +125°C 180 μV
Offset Voltage Drift ΔVOS/ΔT −40°C TA ≤ +125°C 0.8 2.2 μV/°C Input Bias Current I
B
−40°C TA ≤ +125°C 340 nA Input Offset Current I
OS
−40°C TA ≤ +125°C 340 nA Input Voltage Range IVR Common-Mode Rejection Ratio CMRR −2.0 V ≤ VCM ≤ +2.0 V 120 135 dB
−40°C TA ≤ +125°C 105 dB Large Signal Voltage Gain AVO R
−40°C TA ≤ +125°C 100 dB Input Capacitance
Differential Capacitance C Common-Mode Capacitance C
15.4 pF
DIFF
CM
OUTPUT CHARACTERISTICS
Output Voltage High V
OH
−40°C TA ≤ +125°C 3.3 V R
−40°C TA ≤ +125°C 3.5 V Output Voltage Low V
OL
−40°C TA ≤ +125°C −3.3 V R
−40°C TA ≤ +125°C −3.4 V Output Short-Circuit Current I Closed-Loop Output Impedance Z
SC
At 1 MHz, AV = 1 5 Ω
OUT
POWER SUPPLY
Power Supply Rejection Ratio PSRR VSY = ±18 V to ±4.5 V 120 140 dB
−40°C TA ≤ +125°C 118 dB Supply Current per Amplifier ISY 4.8 5.5 mA
−40°C TA ≤ +125°C 6.5 mA
DYNAMIC PERFORMANCE
Slew Rate SR AV = −1, RL = 2 kΩ 14 V/μs A Settling Time tS To 0.01%, step = 10 V 2 μs Gain Bandwidth Product GBP 10 MHz Phase Margin ΦM 60 Degrees
NOISE PERFORMANCE
Peak-to-Peak Noise en p-p 0.1 Hz to 10 Hz 76 nV p-p Voltage Noise Density e
n
f = 10 Hz 1.5 nV/√Hz Correlated Current Noise f = 1 kHz 2.0 pA/√Hz f = 10 Hz 4.2 pA/√Hz Uncorrelated Current Noise f = 1 kHz 2.4 pA/√Hz f = 10 Hz 5.2 pA/√Hz Total Harmonic Distortion + Noise THD + N G = 1, RL ≥ 1 kΩ, f = 1 kHz, V Channel Separation CS f = 10 kHz −120 dB
15 120 μV
40 210 nA
65 250 nA
−2.0 +2.0 V
≥ 600 Ω, V
L
= −11 V to +11 V 105 110 dB
O
5.5 pF
RL = 600 Ω 3.5 3.7 V
= 2 kΩ 3.7 3.8 V
L
RL = 600 Ω −3.6 −3.4 V
= 2 kΩ −3.7 −3.5 V
L
±52 mA
= 1, RL = 2 kΩ 14 V/μs
V
f = 1 kHz 1.07 1.15 nV/√Hz
Rev. C | Page 3 of 20
RMS
= 1 V
−120 dB
AD8597/AD8599
VS = ±15 V, VCM = 0 V, VO = 0 V, TA = +25°C, unless otherwise specified.
Table 3.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage V
OS
−40°C TA ≤ +125°C 180 μV
Offset Voltage Drift ΔVOS/ΔT −40°C TA ≤ +125°C 0.8 2.2 μV/°C
Input Bias Current I
B
−40°C TA ≤ +125°C 300 nA Input Offset Current I
OS
−40°C TA ≤ +125°C 300 nA Input Voltage Range IVR Common-Mode Rejection Ratio CMRR −12.5 V ≤ VCM ≤ +12.5 V 120 135 dB
−40°C TA ≤ +125°C 115 dB Large Signal Voltage Gain AVO R
−40°C TA ≤ +125°C 106 dB Input Capacitance
Differential Capacitance C Common-Mode Capacitance C
12.1 pF
DIFF
CM
OUTPUT CHARACTERISTICS
Output Voltage High V
OH
−40°C TA ≤ +125°C 12.8 V R
−40°C TA ≤ +125°C 13.2 V Output Voltage Low V
OL
−40°C TA ≤ +125°C −12.8 V R
−40°C TA ≤ +125°C −13.3 V Output Short-Circuit Current I Closed-Loop Output Impedance Z
SC
At 1 MHz, AV = 1 5 Ω
OUT
POWER SUPPLY
Power Supply Rejection Ratio PSRR VSY = ±18 V to ±4.5 V 120 140 dB
−40°C TA ≤ +125°C 118 dB Supply Current per Amplifier ISY 5.0 5.7 mA
−40°C TA ≤ +125°C 6.75 mA
DYNAMIC PERFORMANCE
Slew Rate SR AV = −1, RL = 2 kΩ 16 V/μs A Settling Time ts To 0.01%, step = 10 V 2 μs Gain Bandwidth Product GBP 10 MHz Phase Margin ΦM 65 Degrees
NOISE PERFORMANCE
Peak-to-Peak Noise en p-p 0.1 Hz to 10 Hz 76 Voltage Noise Density e
n
f = 10 Hz 1.5 nV/√Hz Correlated Current Noise f = 1 kHz 1.9 pA/√Hz f = 10 Hz 4.3 pA/√Hz Uncorrelated Current Noise f = 1 kHz 2.3 pA/√Hz f = 10 Hz 5.3 pA/√Hz Total Harmonic Distortion + Noise THD + N G = 1, R Channel Separation CS f = 10 kHz −120 dB
10 120 μV
25 200 nA
50 200 nA
−12.5 +12.5 V
≥ 600 Ω, V
L
= −11 V to +11 V 110 116 dB
O
5.1 pF
RL = 600 Ω 13.1 13.4 V
= 2 kΩ 13.5 13.7 V
L
RL = 600 Ω −13.2 −12.9 V
= 2 kΩ −13.5 −13.4 V
L
±52 mA
= 1, RL = 2 kΩ 15 V/μs
V
nV p-p
f = 1 kHz 1.07 1.15 nV/√Hz
≥ 1 kΩ, f = 1 kHz, V
L
Rev. C | Page 4 of 20
RMS
= 3 V
−120 dB
AD8597/AD8599

ABSOLUTE MAXIMUM RATINGS

Table 4.
Parameter Rating
Supply Voltage ±18 V Input Voltage −V ≤ VIN ≤ +V Differential Input Voltage1 ±1 V Output Short-Circuit to GND Indefinite Storage Temperature Range −65°C to +150°C Operating Temperature Range −40°C to +125°C Lead Temperature Range (Soldering 60 sec) 300°C Junction Temperature 150°C
1
If the differential input voltage exceeds 1 V, the current should be limited
to 5 mA.
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

θJA is specified with the device soldered on a circuit board with its exposed paddle soldered to a pad (if applicable) on a 4-layer JEDEC standard PCB with zero air flow.
Table 5.
Package Type θJA θ
8-Lead LFCSP_VD (CP-8-2) 78 20 °C/W 8-Lead SOIC (R-8) (AD8597) 140 39 °C/W 8-Lead SOIC (R-8) (AD8599) 120 36 °C/W
Unit
JC

POWER SEQUENCING

The op amp supplies should be applied simultaneously. The op amp supplies should be stable before any input signals are applied. In any case, the input current must be limited to 5 mA.

ESD CAUTION

Rev. C | Page 5 of 20
AD8597/AD8599

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25°C, unless otherwise noted.
70
60
50
40
30
20
NUMBER OF AMPLIFIERS
10
0
–75 –65 –55 –45 –35 –25 –15 –5 15 25 35 45 55 65 755
VOS (µV)
Figure 4. Input Offset Voltage Distribution
60
50
40
30
20
NUMBER OF AMPLIFIERS
10
0
0 0.2 1.6 1.8 2.0 2.41.41.21.00.4 0.6 0.8 2.2
TCVOS (µV)
Figure 5. TCVOS Distribution, −40°C ≤ TA ≤ +125°C
AD8599 MEAN = 8.23 STDEV = 24.47
MIN = –72.62 MAX = 62.09 V
= ±5V
SY
AD8599 MEAN = 0.346 STDEV = 0. 218
MIN = 0.010 MAX = 1.155 V
= ±5V
SY
70
60
50
40
30
20
NUMBER OF AMPL IFIE R S
10
0
–75 –65–55 –45 –35 –25 –15 –5 15 25 35 45 55 65 755
6274-001
VOS (µV)
AD8599 MEAN = 7.91 STDEV = 21. 89 MIN = –63.02 MAX = 57.5
= ±15V
V
SY
06274-002
Figure 7. Input Offset Voltage Distribution
45
40
35
30
25
20
15
NUMBER OF AMPLIFIERS
10
5
0
0 0.2 1.6 1.8 2.0 2.41.41.21.00.4 0.6 0.8 2.2
06274-004
TCVOS (µV)
AD8599 MEAN = 0.765 STDEV = 0.234
MIN = 0.338 MAX = 1.709
= ±15V
V
SY
6274-007
Figure 8. TCVOS Distribution, −40°C ≤ TA ≤ +125°C
60
50
40
30
20
NUMBER OF AMPLIFIERS
10
0
0 0.2 1.6 1.8 2.0 2.41.41.21.00.4 0.6 0.8 2.2
TCVOS (µV)
Figure 6. TCVOS Distribution, −40°C ≤ TA ≤ +85°C
AD8599 MEAN = 0.461 STDEV = 0. 245 MIN = 0.026 MAX = 1.26 V
= ±5V
SY
6274-006
Rev. C | Page 6 of 20
60
50
40
30
20
NUMBER OF AMPLIFIERS
10
0
0 0.2 1.6 1.8 2.0 2.41.41.21.00.4 0.6 0.8 2.2
TCVOS (µV)
Figure 9. TCVOS Distribution, −40°C ≤ TA ≤ +85°C
AD8599 MEAN = 0.342 STDEV = 0. 221
MIN = 0.013 MAX = 1.239
= ±15V
V
SY
06274-005
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