Low Noise, Precision 16 V CMOS,
Rail-to-Rail Operational Amplifiers
AD8661/AD8662/AD8664
Data Sheet
PIN CONFIGURATIONS
NIC 1
V+
–IN 2
AD8661
+IN 3
TOP VIEW
(Not to Scale)
NIC = NO INTERNALCONNECTION
05200-002
NIC
7
TOP VIEW
+IN 3 (Not to Scale) 6 OUT
5 NIC
V– 4
OUT A 1
8
AD8662
Sensors
Medical equipment
Consumer audio
Photodiode amplification
ADC drivers
6 OUT
5 NIC
V– 4
OUT A 1
Figure 3. AD8662, 8-Lead SOIC
(R-8)
8
V+
–IN A 2
OUT B
TOP VIEW
+IN A 3 (Not to Scale) 6 –IN B
5 +IN B
V– 4
7 V+
Figure 2. AD8661, 8-Lead LFCSP
(CP-8-13)
V+
7
8 NIC
NOTES
1. NIC = NO INTERNAL CONNECTION.
2. CONNECT THE EXPOSED PAD TO V–.
Figure 1. AD8661, 8-Lead SOIC
(R-8)
–IN A 2
APPLICATIONS
8
AD8661
05200-035
NIC 1
–IN 2
05200-001
Low offset voltage: 100 µV maximum at VS = 5 V
Low input bias current: 1 pA maximum
Single-supply operation: 5 V to 16 V
Low noise: 10 nV/√Hz
Wide bandwidth: 4 MHz
Unity-gain stable
Small package options
3 mm × 3 mm 8-lead LFCSP
8-lead MSOP and narrow SOIC
14-lead TSSOP and narrow SOIC
AD8662
7
OUT B
+IN A 3
TOP VIEW
(Not to Scale)
6
–IN B
5
+IN B
V– 4
05200-004
FEATURES
Figure 4. AD8662, 8-Lead MSOP
(RM-8)
14
OUT D
OUT A 1
13
–IN D
–IN A 2
12 +IN D
TOP VIEW
V+ 4 (Not to Scale) 11 V–
+IN A 3
OUT A 1
–IN A 2
AD8664
14
AD8664
OUT D
13
–IN D
12 +IN D
TOP VIEW
V+ 4 (Not to Scale) 11 V–
+IN A 3
+IN C
+IN B 5
10
+IN C
9
–IN C
–IN B 6
9
–IN C
OUT B 7
8
OUT C
OUT B 7
8
OUT C
Figure 5. AD8664, 14-Lead SOIC
(R-14)
05200-037
10
–IN B 6
05200-036
+IN B 5
Figure 6. AD8664, 14-Lead TSSOP
(RU-14)
GENERAL DESCRIPTION
The AD8661/AD8662/AD86641 are rail-to-rail output, singlesupply amplifiers that use the Analog Devices, Inc., patented
DigiTrim® trimming technique to achieve low offset voltage.
The AD8661/AD8662/AD8664 series features extended
operating ranges, with supply voltages up to 16 V. It also
features low input bias current, wide signal bandwidth,
and low input voltage and current noise.
The combination of low offset, very low input bias current,
and a wide supply range makes these amplifiers useful in a wide
variety of applications usually associated with higher priced JFET
amplifiers. Systems using high impedance sensors, such as
photodiodes, benefit from the combination of low input bias
current, low noise, low offset, and wide bandwidth. The wide
operating voltage range meets the demands of high performance
analog-to-digital converters (ADCs) and digital-to-analog
1
converters (DACs). Audio applications and medical monitoring
equipment can take advantage of the high input impedance, low
voltage, low current noise, and wide bandwidth.
The single AD8661 is available in a narrow 8-lead SOIC package
and a very thin, dual lead, 8-lead LFCSP. The AD8661 SOIC
package is specified over the extended industrial temperature
range of −40°C to +125°C. The AD8661 LFCSP is specified over
the industrial temperature range of −40°C to +85°C. The AD8662
is available in a narrow 8-lead SOIC package and an 8-lead MSOP,
both specified over the extended industrial temperature range of
−40°C to +125°C. The AD8664 is available in a narrow 14-lead
SOIC package and a 14-lead TSSOP, both with an extended
industrial temperature range of −40°C to +125°C.
Protected by U.S. Patents 6,194,962 and 6,696,894.
Rev. E
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