Precision, Very Low Noise,
Low Input Bias Current, Wide
Bandwidth JFET Operational Amplifiers
AD8610/AD8620
FEATURES PIN CONFIGURATIONS
Low noise: 6 nV/Hz
NULL 1 8 NC
Low offset voltage: 100 V maximum IN 2 7 V+
AD8610
+IN 3 6 OUT
Low input bias current: 10 pA maximum TOP VIEW
(Not to Scale)
V 4 5 NULL
Fast settling: 600 ns to 0.01%
Low distortion
NC = NO CONNECT
Unity gain stable
Figure 1. 8-Lead MSOP and 8-Lead SOIC_N
No phase reversal
Dual-supply operation: 5 V to 13 V
OUTA 1 8 V+
INA 2 7 OUTB
AD8620
APPLICATIONS
+INA 3 6 INB
TOP VIEW
(Not to Scale)
Photodiode amplifiers V 4 5 +INB
ATE
Instrumentation
Figure 2. 8-Lead SOIC_N
Sensors and controls
High performance filters
Fast precision integrators
High performance audio
GENERAL DESCRIPTION
The AD8610/AD8620 are very high precision JFET input ampli-
Applications for the AD8610/AD8620 include electronic instru-
fiers featuring ultralow offset voltage and drift, very low input
ments; ATE amplification, buffering, and integrator circuits;
voltage and current noise, very low input bias current, and wide
CAT/MRI/ultrasound medical instrumentation; instrumentation
bandwidth. Unlike many JFET amplifiers, the AD8610/AD8620
quality photodiode amplification; fast precision filters (including
input bias current is low over the entire operating temperature
PLL filters); and high quality audio.
range. The AD8610/AD8620 are stable with capacitive loads of
The AD8610/AD8620 are fully specified over the extended
over 1000 pF in noninverting unity gain; much larger capacitive
industrial temperature range (40C to +125C). The AD8610
loads can be driven easily at higher noise gains. The AD8610/
is available in the narrow 8-lead SOIC and the tiny 8-lead MSOP
AD8620 swing to within 1.2 V of the supplies even with a 1 k
surface-mount packages. The AD8620 is available in the narrow
load, maximizing dynamic range even with limited supply volt-
8-lead SOIC package. The 8-lead MSOP packaged devices are
ages. Outputs slew at 50 V/s in either inverting or noninverting
avail-able only in tape and reel.
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.
Rev. F
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02730-001
02730-002AD8610/AD8620
TABLE OF CONTENTS
Features .............................................................................................. 1 Absolute Maximum Ratings ............................................................5
Applications ....................................................................................... 1 ESD Caution...................................................................................5
Pin Configurations ........................................................................... 1 Typical Performance Characteristics ..............................................6
General Description ......................................................................... 1 Theory of Operation ...................................................................... 13
Revision History ............................................................................... 2 Functional Description .............................................................. 13
Specif icat ions ..................................................................................... 3 Outline Dimensions ....................................................................... 22
Electrical Specifications ............................................................... 4 Ordering Guide .......................................................................... 22
Changes to Specifications ................................................................. 2
REVISION HISTORY
Changes to Ordering Guide ............................................................. 4
5/08Rev. E to Rev. F
Updated Outline Dimensions ....................................................... 17
Changes to Figure 17 ........................................................................ 8
10/02Rev. B to Rev. C.
Changes to Functional Description Section ............................... 13
Updated Ordering Guide ................................................................. 4
Changes to THD Readings vs. Common-Mode Voltage
Edits to Figure 15 ............................................................................ 12
Section .............................................................................................. 17
Updated Outline Dimensions ....................................................... 16
Changes to Output Current Capability Section ......................... 18
Changes to Figure 66 and Figure 67 ............................................. 19
5/02Rev. A to Rev. B
Changes to Figure 68 ...................................................................... 20
Addition of Part Number AD8620 ................................... Universal
Replaced Second-Order Low-Pass Filter Section ....................... 20
Addition of 8-Lead SOIC (R-8 Suffix) Drawing ............................ 1
11/06Rev. D to Rev. E
Changes to General Description ..................................................... 1
Additions to Specifications .............................................................. 2
Updated Format .................................................................. Universal
Change to Electrical Specifications ................................................. 3
Changes to Table 1 ............................................................................ 3
Additions to Ordering Guide ........................................................... 4
Changes to Table 2 ............................................................................ 4
Replace TPC 29 .................................................................................. 8
Changes to Outline Dimensions ................................................... 21
Changes to Ordering Guide .......................................................... 21 Add Channel Separation Test Circuit Figure ................................. 9
Add Channel Separation Graph ...................................................... 9
Changes to Figure 26 ...................................................................... 15
2/04Rev. C to Rev. D.
Addition of High-Speed, Low Noise Differential Driver
section .............................................................................................. 16
Addition of Figure 30 ..................................................................... 16
Rev. F | Page 2 of 24