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AD8684 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8684
Beschreibung High Speed JFET Operational Amplifiers
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
AD8684 Datasheet, Funktion
Dual/Quad Low Power, High Speed
JFET Operational Amplifiers
AD8682/AD8684
FEATURES
Low supply current: 250 μA/amp maximum
High slew rate: 9 V/μs
Bandwidth: 3.5 MHz typical
Low offset voltage: 1 mV maximum @ 25°C
Low input bias current: 20 pA maximum @ 25°C
CMRR: 90 dB typical
Fast settling time
Unity-gain stable
APPLICATIONS
Portable telecommunications
Low power industrial and instrumentation
Loop filters
Active and precision filters
Integrators
Strain gauge amplifiers
Portable medical instrumentation
Supply current monitoring
GENERAL DESCRIPTION
The AD8682 and AD8684 are dual and quad low power, precision
(1 mV) JFET amplifiers featuring excellent speed at low supply
currents. The slew rate is typically 9 V/μs with a supply current
under 250 μA per amplifier. These unity-gain stable amplifiers
have a typical gain bandwidth of 3.5 MHz. The JFET input stage
ensures bias current is typically a few picoamps and below
125 pA maximum over the full temperature operating range.
PIN CONFIGURATIONS
OUT A 1
–IN A 2
+IN A 3
V– 4
AD8682
TOP VIEW
(Not to Scale)
8 V+
7 OUT B
6 –IN B
5 +IN B
Figure 1. 8-Lead SOIC_N and 8-Lead MSOP
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
OUT B 7
AD8684
14 OUT D
13 –IN D
12 +IN D
11 V–
10 +IN C
9 –IN C
8 OUT C
TOP VIEW
(Not to Scale)
Figure 2. 14-Lead SOIC_N and 14-Lead TSSOP
The devices are ideal for portable, low power applications,
especially with high source impedance. The devices are unity-gain
stable and can drive higher capacity loads (G = 1, noninverting),
as an example of their excellent dynamic response over a wide
range of conditions, delivering dc precision performance at low
quiescent currents.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2006–2008 Analog Devices, Inc. All rights reserved.






AD8684 Datasheet, Funktion
AD8682/AD8684
1000
100
VS = ±15V
TA = 25°C
10
1
10 100 1k
FREQUENCY (Hz)
Figure 9. Voltage Noise Density vs. Frequency
10k
1000
VS = ±15V
TA = 25°C
100
10
1
0.1
–15
–10 –5
0
5
COMMON-MODE VOLTAGE (V)
10
15
Figure 10. Input Bias Current vs. Common-Mode Voltage
480
TA = 25°C
475
470
465
460
455
450
0
±5 ±10 ±15
SUPPLY VOLTAGE (V)
±20
Figure 11. AD8682 Supply Current vs. Supply Voltage
20
TA = 25°C
15 RL = 10k
10
VOH
5
0
–5
–10
VOL
–15
–20
0
±5 ±10 ±15
SUPPLY VOLTAGE (V)
±20
Figure 12. Output Voltage Swing vs. Supply Voltage
1000
VS = ±15V
TA = 25°C
100
AVCL = 100
10
AVCL = 10
1
AVCL = 1
0.1
100
1k 10k 100k
FREQUENCY (Hz)
1M
Figure 13. Closed-Loop Output Impedance vs. Frequency
480
475
470
465
460
455
450
–50
–25
0 25 50 75
TEMPERATURE (°C)
100
Figure 14. AD8682 Supply Current vs. Temperature
125
Rev. B | Page 6 of 16

6 Page









AD8684 pdf, datenblatt
AD8682/AD8684
OUTLINE DIMENSIONS
5.00 (0.1968)
4.80 (0.1890)
4.00 (0.1574)
3.80 (0.1497)
8
1
5
6.20 (0.2441)
4 5.80 (0.2284)
0.25 (0.0098)
0.10 (0.0040)
1.27 (0.0500)
BSC
1.75 (0.0688)
1.35 (0.0532)
COPLANARITY
0.10 SEATING
PLANE
0.51 (0.0201)
0.31 (0.0122)
0.50 (0.0196)
0.25 (0.0099)
45°
1.27 (0.0500)
0.25 (0.0098) 0.40 (0.0157)
0.17 (0.0067)
COMPLIANT TO JEDEC STANDARDS MS-012-A A
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
Figure 36. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)
3.20
3.00
2.80
3.20
3.00
2.80
8
1
5 5.15
4.90
4.65
4
PIN 1
0.95
0.85
0.75
0.65 BSC
1.10 MAX
0.15
0.00
0.38
0.22
COPLANARITY
0.10
SEATING
PLANE
0.23
0.08
0.80
0.60
0.40
COMPLIANT TO JEDEC STANDARDS MO-187-AA
Figure 37. 8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
Rev. B | Page 12 of 16

12 Page





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