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AD8674 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8674
Beschreibung Low Input Bias Current Operational Amplifiers
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 20 Seiten
AD8674 Datasheet, Funktion
Data Sheet
Precision, Very Low Noise, Low Input
Bias Current Operational Amplifiers
AD8671/AD8672/AD8674
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 1
8 NC
–IN 2 AD8671 7 V+
+IN 3 TOP VIEW 6 OUT
(Not to Scale)
V– 4
5 NC
NC = NO CONNECT
Figure 1. 8-Lead SOIC_N (R-8) and 8-Lead MSOP (RM-8)
OUT A 1
8 V+
–IN A 2 AD8672 7 OUT B
+IN A 3 TOP VIEW 6 –IN B
(Not to Scale)
V– 4
5 +IN B
Figure 2. 8-Lead SOIC-N (R-8) and 8-Lead MSOP (RM-8)
OUT A 1
14 OUT D
–IN A 2
13 –IN D
+IN A 3 AD8674 12 +IN D
V+ 4 TOP VIEW 11 V–
+IN B 5 (Not to Scale) 10 +IN C
–IN B 6
9 –IN C
OUT B 7
8 OUT C
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
Single AD797 AD8597
Dual
AD8599
Quad
1.8 nV
ADA4004-1
ADA4004-2
ADA4004-4
2.8 nV
AD8675
AD8676
3.8 nV
AD8671
AD8672
AD8674
Rev. F
Document Feedback
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2004–2013 Analog Devices, Inc. All rights reserved.
Technical Support
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AD8674 Datasheet, Funktion
AD8671/AD8672/AD8674
TYPICAL PERFORMANCE CHARACTERISTICS
32
VS = ±15V
28
24
20
16
12
8
4
0
0 10 20 30 40 50 60 70 80 90 100
FREQUENCY (Hz)
Figure 4. Voltage Noise Density vs. Frequency
31.5
27.0
VS = ±15V
22.5
18.0
13.5
9.0
4.5
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
FREQUENCY (kHz)
Figure 5. Voltage Noise Density vs. Frequency
17.5
15.0
VS = ±15V
12.5
10.0
7.5
5.0
2.5
0
0 1 2 3 4 5 6 7 8 9 10
FREQUENCY (kHz)
Figure 6. Voltage Noise Density vs. Frequency
Data Sheet
10
1
0.1
1
10 100 1k
FREQUENCY (Hz)
Figure 7. Current Noise Density VS = ±15 V
10k
45
VS = ±5V
40 TA = 25°C
35
30
25
20
15
10
5
0
–35–30–25–20–15–10 –5 0 5 10 15 20 25 30 35 40 45
VOS (µV)
Figure 8. Input Offset Voltage Distribution
35
VS = ±15V
TA = 25°C
30
25
20
15
10
5
0
–35–30–25–20–15–10 –5 0 5 10 15 20 25 30 35 40 45 50
VOS (µV)
Figure 9. Input Offset Voltage Distribution
Rev. F | Page 6 of 20

6 Page









AD8674 pdf, datenblatt
AD8671/AD8672/AD8674
OUTPUT PHASE REVERSAL
Phase reversal is a change of polarity in the amplifier transfer
function that occurs when the input voltage exceeds the supply
voltage. The AD8671/AD8672/AD8674 do not exhibit phase
reversal even when the input voltage is 1 V beyond the supplies.
VSY = ±15V
VIN
VOUT
TIME (10s/DIV)
Figure 31. Output Phase Reversal
Data Sheet
TOTAL NOISE VS. SOURCE RESISTANCE
The low input voltage noise of the AD8671/AD8672/AD8674
makes them a great choice for applications with low source
resistance. However, because they have low input current noise,
they can also be used in circuits with substantial source
resistance.
Figure 32 shows the voltage noise, current noise, thermal noise,
and total rms noise of the AD8671 as a function of the source
resistance.
For RS < 475 Ω, the input voltage noise, en, dominates.
For 475 Ω < RS < 412 kΩ, thermal noise dominates.
For RS > 412 kΩ, the input current noise dominates.
1000
100
10
1
10
C
in
en_t
A
(4kRST)1/2
B
en
100 1k 10k 100k
SOURCE RESISTANCE ()
Figure 32. Noise vs. Source Resistance
1M
Rev. F | Page 12 of 20

12 Page





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