16 V, 4 MHz Rail-to-Rail
Output Amplifiers
AD8665/AD8666/AD8668
FEATURES
PIN CONFIGURATIONS
Offset voltage: 2.5 mV max
Low input bias current: 1 pA max
Single-supply operation: 5 V to 16 V
Dual-supply operation: 2.5 V to 8 V
Low noise: 8 nV/√Hz @ 10 kHz
Wide bandwidth: 4 MHz
1
2
5
OUT
V–
V+
AD8665
TOP VIEW
(Not to Scale)
3
4
–IN
+IN
Figure 1. AD8665, 5-Lead SOT-23 (RJ-5)
Rail-to-rail output
Unity-gain stable
Lead-free packaging
NC
–IN
1
2
3
4
8
7
6
5
NC
AD8665
VCC
OUT
NC
+IN
TOP VIEW
(Not to Scale)
VEE
APPLICATIONS
NC = NO CONNECT
Sensor amplification
Reference buffers
Figure 2. AD8665, 8-Lead SOIC_N (R-8)
Medical equipment
Physiological measurements
Signal filters and conditioning
Consumer audio
OUT A
–IN A
+IN A
V–
1
2
3
4
8
7
6
5
V+
AD8666
OUT B
–IN B
+IN B
TOP VIEW
(Not to Scale)
Photodiode amplification
ADC driver
Figure 3. AD8666, 8-Lead SOIC_N (R-8)
Level shifting circuits
1
2
3
4
8
7
6
5
OUT A
–IN A
+IN A
V–
V+
OUT B
–IN B
+IN B
AD8666
TOP VIEW
(Not to Scale)
GENERAL DESCRIPTION
The AD866x family are single supply, rail-to-rail output
amplifiers with low noise performance featuring an extended
operating range with supply voltages up to 16 V. They also
feature low input bias currents, wide signal bandwidth, and low
input voltage and current noise. For lower offset voltage, choose
the AD8661/AD8662/AD8664 family.
Figure 4. AD8666, 8-Lead MSOP (RM-8)
1
OUT A
IN A
14
13
12
11
10
9
OUT D
–IN D
+IN D
V–
2
3
4
5
6
7
+IN A
V+
AD8668
TOP VIEW
(Not to Scale)
The combination of low offsets, very low input bias currents,
and wide supply range make these amplifiers useful in a wide
variety of cost sensitive applications normally associated with
much higher priced JFET amplifiers. Systems using high
impedance sensors, such as photo diodes, benefit from the
combination of low input bias current, low noise, and low offset
and bandwidth. The wide operating voltage range matches high
performance ADCs and DACs. Audio applications and medical
monitoring equipment can take advantage of the high input
impedance, low voltage and current noise, wide bandwidth, and
the lack of popcorn noise found in many other low input bias
current amplifiers.
+IN B
–IN B
OUT B
+IN C
–IN C
OUT C
8
Figure 5. AD8668, 14-Lead TSSOP (RU-14)
1
2
3
4
5
14
13
12
11
10
9
OUT A
–IN A
+IN A
V+
OUT D
–IN D
+IN D
V–
AD86648
TOP VIEW
(Not to Scale)
+IN B
–IN B
OUT B
+IN C
–IN C
OUT C
6
7
8
Figure 6. AD8668, 14-Lead SOIC_N (R-14)
The AD866x family is specified over the extended industrial
temperature range (−40°C to +125°C).
Rev. A
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