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AD8620ARZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
Precision, Very Low Noise,
Low Input Bias Current, Wide
Bandwidth JFET Operational Amplifiers
AD8610/AD8620
Rev. F
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 ©2001–2008 Analog Devices, Inc. All rights reserved.
FEATURES
Low noise: 6 nV/√Hz
Low offset voltage: 100 μV maximum
Low input bias current: 10 pA maximum
Fast settling: 600 ns to 0.01%
Low distortion
Unity gain stable
No phase reversal
Dual-supply operation: ±5 V to ±13 V
APPLICATIONS
Photodiode amplifiers
ATE
Instrumentation
Sensors and controls
High performance filters
Fast precision integrators
High performance audio
PIN CONFIGURATIONS
NC = NO CONNECT
AD8610
TOP VIEW
(Not to Scale)
NULL
1
–IN
2
+IN
3
V–
4
NC
V+
OUT
NULL
8
7
6
5
02730-001
Figure 1. 8-Lead MSOP and 8-Lead SOIC_N
AD8620
TOP VIEW
(Not to Scale)
OUTA
1
–INA
2
+INA
3
V–
4
V+
OUTB
–INB
+INB
0
2730-002
8
7
6
5
Figure 2. 8-Lead SOIC_N
GENERAL DESCRIPTION
The AD8610/AD8620 are very high precision JFET input ampli-
fiers featuring ultralow offset voltage and drift, very low input
voltage and current noise, very low input bias current, and wide
bandwidth. Unlike many JFET amplifiers, the AD8610/AD8620
input bias current is low over the entire operating temperature
range. The AD8610/AD8620 are stable with capacitive loads of
over 1000 pF in noninverting unity gain; much larger capacitive
loads can be driven easily at higher noise gains. The AD8610/
AD8620 swing to within 1.2 V of the supplies even with a 1 kΩ
load, maximizing dynamic range even with limited supply volt-
ages. Outputs slew at 50 V/μs in either inverting or noninverting
gain configurations, and settle to 0.01% accuracy in less than
600 ns. Combined with high input impedance, great precision,
and very high output drive, the AD8610/AD8620 are ideal
amplifiers for driving high performance ADC inputs and
buffering DAC converter outputs.
Applications for the AD8610/AD8620 include electronic instru-
ments; ATE amplification, buffering, and integrator circuits;
CAT/MRI/ultrasound medical instrumentation; instrumentation
quality photodiode amplification; fast precision filters (including
PLL filters); and high quality audio.
The AD8610/AD8620 are fully specified over the extended
industrial temperature range (−40°C to +125°C). The AD8610
is available in the narrow 8-lead SOIC and the tiny 8-lead MSOP
surface-mount packages. The AD8620 is available in the narrow
8-lead SOIC package. The 8-lead MSOP packaged devices are
avail-able only in tape and reel.
AD8610/AD8620
Rev. F | Page 2 of 24
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Electrical Specifications ............................................................... 4
Absolute Maximum Ratings ............................................................5
ESD Caution...................................................................................5
Typical Performance Characteristics ..............................................6
Theory of Operation ...................................................................... 13
Functional Description .............................................................. 13
Outline Dimensions ....................................................................... 22
Ordering Guide .......................................................................... 22
REVISION HISTORY
5/08—Rev. E to Rev. F
Changes to Figure 17 ........................................................................ 8
Changes to Functional Description Section ............................... 13
Changes to THD Readings vs. Common-Mode Voltage
Section .............................................................................................. 17
Changes to Output Current Capability Section ......................... 18
Changes to Figure 66 and Figure 67 ............................................. 19
Changes to Figure 68 ...................................................................... 20
Replaced Second-Order Low-Pass Filter Section ....................... 20
11/06—Rev. D to Rev. E
Updated Format .................................................................. Universal
Changes to Table 1 ............................................................................ 3
Changes to Table 2 ............................................................................ 4
Changes to Outline Dimensions ................................................... 21
Changes to Ordering Guide .......................................................... 21
2/04—Rev. C to Rev. D.
Changes to Specifications ................................................................. 2
Changes to Ordering Guide ............................................................. 4
Updated Outline Dimensions ....................................................... 17
10/02—Rev. B to Rev. C.
Updated Ordering Guide ................................................................. 4
Edits to Figure 15 ............................................................................ 12
Updated Outline Dimensions ....................................................... 16
5/02—Rev. A to Rev. B
Addition of Part Number AD8620 ................................... Universal
Addition of 8-Lead SOIC (R-8 Suffix) Drawing ............................ 1
Changes to General Description ..................................................... 1
Additions to Specifications .............................................................. 2
Change to Electrical Specifications ................................................. 3
Additions to Ordering Guide ........................................................... 4
Replace TPC 29 .................................................................................. 8
Add Channel Separation Test Circuit Figure ................................. 9
Add Channel Separation Graph ...................................................... 9
Changes to Figure 26 ...................................................................... 15
Addition of High-Speed, Low Noise Differential Driver
section .............................................................................................. 16
Addition of Figure 30 ..................................................................... 16
AD8610/AD8620
Rev. F | Page 3 of 24
SPECIFICATIONS
@ V
S
= ±5.0 V, V
CM
= 0 V, T
A
= 25°C, unless otherwise noted.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage (AD8610B) V
OS
45 100 μV
−40°C < T
A
< +125°C 80 200 μV
Offset Voltage (AD8620B) V
OS
45 150 μV
−40°C < T
A
< +125°C 80 300 μV
Offset Voltage (AD8610A/AD8620A) V
OS
85 250 μV
25°C < T
A
< 125°C 90 350 μV
−40°C < T
A
< +125°C 150 850 μV
Input Bias Current I
B
−10 +2 +10 pA
−40°C < T
A
< +85°C −250 +130 +250 pA
−40°C < T
A
< +125°C −2.5 +1.5 +2.5 nA
Input Offset Current I
OS
−10 +1 +10 pA
−40°C < T
A
< +85°C −75 +20 +75 pA
−40°C < T
A
< +125°C −150 +40 +150 pA
Input Voltage Range −2 +3 V
Common-Mode Rejection Ratio CMRR V
CM
= –1.5 V to +2.5 V 90 95 dB
Large Signal Voltage Gain A
VO
R
L
= 1 kΩ, V
O
= −3 V to +3 V 100 180 V/mV
Offset Voltage Drift (AD8610B) ΔV
OS
/ΔT −40°C < T
A
< +125°C 0.5 1 μV/°C
Offset Voltage Drift (AD8620B) ΔV
OS
/ΔT −40°C < T
A
< +125°C 0.5 1.5 μV/°C
Offset Voltage Drift (AD8610A/AD8620A) ΔV
OS
/ΔT −40°C < T
A
< +125°C 0.8 3.5 μV/°C
OUTPUT CHARACTERISTICS
Output Voltage High V
OH
R
L
= 1 kΩ, −40°C < T
A
< +125°C 3.8 4 V
Output Voltage Low V
OL
R
L
= 1 kΩ, −40°C < T
A
< +125°C −4 −3.8 V
Output Current I
OUT
V
OUT
> ±2 V ±30 mA
POWER SUPPLY
Power Supply Rejection Ratio PSRR V
S
= ±5 V to ±13 V 100 110 dB
Supply Current per Amplifier I
SY
V
O
= 0 V 2.5 3.0 mA
−40°C < T
A
< +125°C 3.0 3.5 mA
DYNAMIC PERFORMANCE
Slew Rate SR R
L
= 2 kΩ 40 50 V/μs
Gain Bandwidth Product GBP 25 MHz
Settling Time t
S
A
V
= +1, 4 V step, to 0.01% 350 ns
NOISE PERFORMANCE
Voltage Noise e
n
p-p 0.1 Hz to 10 Hz 1.8 μV p-p
Voltage Noise Density e
n
f = 1 kHz 6 nV/√Hz
Current Noise Density i
n
f = 1 kHz 5 fA/√Hz
Input Capacitance C
IN
Differential Mode 8 pF
Common Mode 15 pF
Channel Separation C
S
f = 10 kHz 137 dB
f = 300 kHz 120 dB
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

AD8620ARZ

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Manufacturer:
Analog Devices Inc.
Description:
Precision Amplifiers Low Inpt Bias Crnt WdeBW JFET Prec Dual
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