Datasheet

Precision, Very Low Noise, Low Input
Bias Current Operational Amplifiers
Data Sheet
AD8671/AD8672/AD8674
Rev. F Document Feedback
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FEATURES
Very low noise: 2.8 nV/√Hz, 77 nV p-p
Wide bandwidth: 10 MHz
Low input bias current: 12 nA max
Low offset voltage: 75 μV max
High open-loop gain: 120 dB min
Low supply current: 3 mA typ per amplifier
Dual-supply operation: ±5 V to ±15 V
Unity-gain stable
No phase reversal
APPLICATIONS
PLL filters
Filters for GPS
Instrumentation
Sensors and controls
Professional quality audio
GENERAL DESCRIPTION
The AD8671/AD8672/AD8674 are very high precision amplifiers
featuring very low noise, very low offset voltage and drift, low
input bias current, 10 MHz bandwidth, and low power
consumption. Outputs are stable with capacitive loads of over
1000 pF. Supply current is less than 3 mA per amplifier at 30 V.
The AD8671/AD8672/AD8674’s combination of ultralow noise,
high precision, speed, and stability is unmatched. The MSOP
version of the AD8671/AD8672 requires only half the board
space of comparable amplifiers.
Applications for these amplifiers include high quality PLL
filters, precision filters, medical and analytical instrumentation,
precision power supply controls, ATE, data acquisition, and
precision controls as well as professional quality audio.
The AD8671/AD8672 are specified over the extended industrial
temperature range (−40°C to +125°C), and the AD8674 is specified
over the industrial temperature range (−40°C to +85°C).
The AD8671/AD8672 are available in the 8-lead SOIC and
8-lead MSOP packages. The AD8674 is available in 14-lead
SOIC and 14-lead TSSOP packages.
Surface-mount devices in MSOP packages are available in tape
and reel only.
PIN CONFIGURATIONS
NC = NO CONNECT
NC 1
–
IN
2
+
IN 3
V– 4
NC
V+
OUT
NC
8
7
6
5
03718-B-001
AD8671
TOP VIEW
(Not to Scale)
Figure 1. 8-Lead SOIC_N (R-8) and 8-Lead MSOP (RM-8)
OUT A 1
–IN A
2
+IN A
3
V– 4
V+
OUT B
–IN B
+IN B
8
7
6
5
03718-B-003
AD8672
TOP VIEW
(Not to Scale)
Figure 2. 8-Lead SOIC-N (R-8) and 8-Lead MSOP (RM-8)
OUT A 1
–IN A 2
+IN A
3
V+
4
+IN B
5
–IN B
6
OUT B 7
OUT D
–IN D
+IN D
V–
14
13
12
11
+IN C
–IN C
OUT C
10
9
8
03718-B-005
AD8674
TOP VIEW
(Not to Scale)
Figure 3. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)
The AD8671, AD8672, and AD8674 are members of a growing
series of low noise op amps offered by Analog Devices, Inc.
Table 1. Voltage Noise
Package 0.9 nV 1.1 nV 1.8 nV 2.8 nV 3.8 nV
Single AD797 AD8597 ADA4004-1 AD8675 AD8671
Dual AD8599 ADA4004-2 AD8676 AD8672
Quad ADA4004-4 AD8674
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