Precision Low Noise CMOS Rail-to-Rail
Input/Output Operational Amplifiers
AD8605/AD8606/AD8608
FEATURES
APPLICATIONS
Low offset voltage: 65 µV maximum
Low input bias currents: 1 pA maximum
Hz
Low noise: 8 nV/√
Photodiode amplification
Battery-powered instrumentation
Multipole filters
Sensors
Barcode scanners
Audio
Wide bandwidth: 10 MHz
High open-loop gain: 120 dB
Unity gain stable
Single-supply operation: 2.7 V to 5.5 V
MicroCSP™
FUNCTIONAL BLOCK DIAGRAMS
GENERAL DESCRIPTION
The AD8605, AD8606, and AD86081 are single, dual, and quad
rail-to-rail input and output, single-supply amplifiers. They
feature very low offset voltage, low input voltage and current
noise, and wide signal bandwidth. They use Analog Devices’
patented DigiTrim® trimming technique, which achieves
superior precision without laser trimming.
OUT
V–
1
2
5
V+
V+
1
2
3
4
8
7
6
5
OUT A
–IN A
OUT B
–IN B
+IN B
AD8605
AD8608
+IN A
V–
–IN
3
4
+IN
Figure 1. 5-Lead SOT-23 (RT Suffix)
Figure 2. 8-Lead SOIC (R Suffix)
TOP VIEW
(BUMP SIDE DOWN)
The combination of low offsets, low noise, very low input bias
currents, and high speed makes these amplifiers useful in a
wide variety of applications. Filters, integrators, photodiode
amplifiers, and high impedance sensors all benefit from the
combination of performance features. Audio and other ac
applications benefit from the wide bandwidth and low
distortion. Applications for these amplifiers include optical
control loops, portable and loop-powered instrumentation,
and audio amplification for portable devices.
1
2
3
4
5
6
7
14
OUT D
OUT A
–IN A
+IN A
V+
OUT
1
V+
5
13 –IN D
12 +IN D
V–
2
AD8608
11
10
9
V–
+IN B
–IN B
OUT B
+IN C
–IN C
OUT C
+IN
3
–IN
4
8
AD8605 ONLY
Figure 3. 5-Bump MicroCSP
(CB Suffix)
Figure 4. 14-Lead SOIC (R Suffix)
The AD8605, AD8606, and AD8608 are specified over the
extended industrial temperature range (−40°C to +125°C). The
AD8605 single is available in the 5-lead SOT-23 and 5-bump
MicroCSP packages. The 5-bump MicroCSP offers the smallest
available footprint for any surface-mount operational amplifier.
The AD8606 dual is available in an 8-lead MSOP package and a
narrow SOIC surface-mount package. The AD8608 quad is
available in a 14-lead TSSOP and a narrow 14-lead SOIC
package. MicroCSP, SOT, MSOP, and TSSOP versions are
available in tape and reel only.
OUT A
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
1
14
OUT A
V+
OUT B
–IN B
1
8
5
–IN A
+IN A
V+
+IN B
–IN B
–IN A
+IN A
V–
AD8606
AD8608
4
+IN B
8
7
OUT B
Figure 5. 8-Lead MSOP (RM Suffix)
Figure 6. 14-Lead TSSOP (RU Suffix)
1 Protected by U.S. Patent No. 5,969,657; other patents pending.
Rev. D
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