AD8620 Analog Devices, AD8620 Datasheet

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AD8620

Manufacturer Part Number
AD8620
Description
Low Input Bias Current, Wide BW JFET Precision Dual Op Amp
Manufacturer
Analog Devices
Datasheet

Specifications of AD8620

-3db Bandwidth
25MHz
Slew Rate
50V/µs
Vos
85µV
Ib
2pA
# Opamps Per Pkg
2
Input Noise (nv/rthz)
6nV/rtHz
Vcc-vee
10V to 27V
Isy Per Amplifier
3.5mA
Packages
SOIC

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
AD8620ARZ-REEL7
Manufacturer:
AD
Quantity:
3 400
Price:
FEATURES
Low noise: 6 nV/√Hz
Low offset voltage: 100 μV maximum
Low input bias current: 10 pA maximum
Fast settling: 600 ns to 0.01%
Low distortion
Unity gain stable
No phase reversal
Dual-supply operation: ±5 V to ±13 V
APPLICATIONS
Photodiode amplifier
ATE
Instrumentation
Sensors and controls
High performance filters
Fast precision integrators
High performance audio
GENERAL DESCRIPTION
The AD8610/AD8620 are very high precision JFET input ampli-
fiers featuring ultralow offset voltage and drift, very low input
voltage and current noise, very low input bias current, and wide
bandwidth. Unlike many JFET amplifiers, the AD8610/AD8620
input bias current is low over the entire operating temperature
range. The AD8610/AD8620 are stable with capacitive loads of
over 1000 pF in noninverting unity gain; much larger capacitive
loads can be driven easily at higher noise gains. The AD8610/
AD8620 swing to within 1.2 V of the supplies even with a 1 kΩ
load, maximizing dynamic range even with limited supply volt-
ages. Outputs slew at 50 V/μs in either inverting or noninverting
gain configurations, and settle to 0.01% accuracy in less than
600 ns. Combined with high input impedance, great precision
and very high output drive, the AD8610/AD8620 are ideal
amplifiers for driving high performance ADC inputs and
buffering DAC converter outputs.
Rev. E
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.
Trademarks and registered trademarks are the property of their respective owners.
Bandwidth JFET Operational Amplifier
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Applications for the AD8610/AD8620 include electronic instru-
ments; ATE amplification, buffering, and integrator circuits;
CAT/MRI/ultrasound medical instrumentation; instrumentation
quality photodiode amplification; fast precision filters (including
PLL filters); and high quality audio.
The AD8610/AD8620 are fully specified over the extended
industrial (−40°C to +125°C) temperature range. The AD8610
is available in the narrow 8-lead SOIC and the tiny 8-lead MSOP
surface-mount packages. The AD8620 is available in the narrow
8-lead SOIC package. 8-lead MSOP packaged devices are avail-
able only in tape and reel.
Low Input Bias Current, Wide
Precision, Very Low Noise,
Figure 1. AD8610 8-Lead MSOP and SOIC_N
NULL
OUTA
PIN CONFIGURATIONS
–INA
+INA
–IN
+IN
V–
Figure 2.AD8620 8-Lead SOIC
V–
1
2
3
4
NC = NO CONNECT
1
2
3
4
©2006 Analog Devices, Inc. All rights reserved.
(Not to Scale)
(Not to Scale)
AD8610
TOP VIEW
AD8620
TOP VIEW
AD8610/AD8620
8
7
6
5
8
7
6
5
NC
V+
OUT
NULL
V+
OUTB
–INB
+INB
www.analog.com

Related parts for AD8620

AD8620 Summary of contents

Page 1

... The AD8610/ AD8620 swing to within 1 the supplies even with a 1 kΩ load, maximizing dynamic range even with limited supply volt- ages. Outputs slew at 50 V/μs in either inverting or noninverting gain configurations, and settle to 0 ...

Page 2

... Absolute Maximum Ratings ............................................................5 Typical Performance Characteristics ..............................................6 Theory of Operation ...................................................................... 13 Functional Description.............................................................. 13 Outline Dimensions ....................................................................... 22 Ordering Guide .......................................................................... 22 5/02—Rev Rev. B Addition of part number AD8620 ...................................Universal Addition of 8-Lead SOIC (R-8 Suffix) Drawing............................1 Changes to General Description .....................................................1 Additions to Specifications ..............................................................2 Change to Electrical Specifications.................................................3 Additions to Ordering Guide...........................................................4 Replace TPC 29..................................................................................8 Add Channel Separation Test Circuit Figure.................................9 Add Channel Separation Graph ...

Page 3

... Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Offset Voltage Drift (AD8610B) Offset Voltage Drift (AD8620B) Offset Voltage Drift (AD8610A/AD8620A) OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Output Current POWER SUPPLY Power Supply Rejection Ratio ...

Page 4

... Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Offset Voltage Drift (AD8610B) Offset Voltage Drift (AD8620B) Offset Voltage Drift (AD8610A/AD8620A) OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Output Current Short Circuit Current POWER SUPPLY ...

Page 5

... Package Type 8-Lead MSOP (RM) –65°C to +150°C 8-Lead SOIC (R) 300°C 1 θ is specified for worst-case conditions; that is, θ JA soldered in circuit board for surface-mount packages. ESD CAUTION Rev Page AD8610/AD8620 1 θ θ Unit JA JC 190 44 °C/W 158 43 °C/W ...

Page 6

... AD8610/AD8620 TYPICAL PERFORMANCE CHARACTERISTICS –250 –150 –50 50 INPUT OFFSET VOLTAGE (µV) Figure 3. Input Offset Voltage at ±13 V 600 400 200 0 –200 –400 –600 –40 25 TEMPERATURE (°C) Figure 4. Input Offset Voltage vs. Temperature at ±13 V (300 Amplifiers – ...

Page 7

... S 4.20 4.15 4.10 4.05 4.00 3.95 125 Figure 13. Output Voltage High vs. Temperature at ±5 V –3.95 –4.00 –4.05 –4.10 –4.15 –4.20 –4.25 –4.30 125 Figure 14. Output Voltage Low vs. Temperature at ±5 V Rev Page AD8610/AD8620 V = ±13V S 1k 10k 100k 1M 10M RESISTANCE LOAD (Ω ± 1kΩ L – 125 TEMPERATURE (° ± ...

Page 8

... AD8610/AD8620 12. ±13V 1kΩ L 12.00 11.95 11.90 11.85 11.80 –40 25 TEMPERATURE (°C) Figure 15. Output Voltage High vs. Temperature at ±13 V –11.80 –11.85 –11.90 –11.95 –12.00 –12.05 –40 25 TEMPERATURE (°C) Figure 16. Output Voltage Low vs. Temperature at ±13 V 120 V = ±13V S 100 R = 1kΩ L MARKER AT 27MHz 80 φ 20pF –20 – ...

Page 9

... V = ±13V S 120 100 10M 60M ± 10M 60M 125 Figure 26. Negative Overvoltage Recovery Rev Page AD8610/AD8620 V = ±13V S 100 1k 10k 100k 1M 10M FREQUENCY (Hz) Figure 24. CMRR vs. Frequency V = ± –3 00mV p – 10k Ω ...

Page 10

... AD8610/AD8620 TIME (1s/DIV) Figure 27. 0 Input Voltage Noise 1000 100 100 1k FREQUENCY (Hz) Figure 28. Input Voltage Noise Density vs. Frequency 100 GAIN = +100 GAIN = + 10k 100k 1M FREQUENCY (Hz) Figure 29. Z vs. Frequency OUT V = ±13V S V p-p = 1.8µV IN 3000 V = ± ...

Page 11

... 20pF L Figure 37. − ±13V S p-p = 20V – 2kΩ 20pF L Figure 38. Large Signal Response at G =−1 Rev Page AD8610/AD8620 V = ±13V S V p-p = 20V 2kΩ 20pF L TIME (400ns/DIV) TIME (400ns/DIV) TIME (1µs/DIV) ...

Page 12

... AD8610/AD8620 TIME (400ns/DIV) Figure 39. + − ±13V S V p-p = 20V – 2kΩ 55V /µ 20pF L Rev Page ±13V S V p-p = 20V – 2kΩ 50V /µ 20pF L TIME (400ns/DIV) Figure 40. − −1 ...

Page 13

... The AD8610/AD8620 are unconditionally stable in all gains, even with capacitive loads well in excess of 1 nF. The AD8610/ AD8620B grade achieves less than 100 μV of offset and 1 μV/°C of offset drift, numbers usually associated with very high precision bipolar input amplifiers. The AD8610 is offered in the tiny 8-lead MSOP as well as narrow 8-lead SOIC surface-mount packages and is fully specified with supply voltages from ± ...

Page 14

... Heavy capacitive loads also increase the amount of overshoot and ringing at the output. Figure 47 and Figure 48 show the AD8610/AD8620 and the OPA627 in a noninverting gain of +2 driving 2 μF of capacitance load. The ringing on the OPA627 is much larger in magnitude and continues 10 times longer than the AD8610/AD8620 ...

Page 15

... –1 Figure 52. –Slew Rate of OPA627 in Unity Gain of –1 The AD8610/AD8620 have a very fast slew rate of 60 V/μs even when configured in a noninverting gain of +1. This is the toughest condition to impose on any amplifier since the input common- mode capacitance of the amplifier generally makes its SR appear worse ...

Page 16

... This 10 kΩ allows input voltages more than 5 V beyond either power supply. Thermal noise generated by the resistor adds 7.5 nV/√Hz to the noise of the AD8610/AD8620. For the AD8610/ AD8620, differential voltages equal to the supply voltage do not cause any problem (see Figure 55). In this context, please note that ...

Page 17

... The AD8610/AD8620 have a very fast settling time, even to a very tight error band, as can be seen from Figure 60. The AD8610/ AD8620 are configured in an inverting gain of +1 with 2 kΩ input and feedback resistors. The output is monitored with MΩ, 11.2 pF scope probe. ...

Page 18

... V. Figure 64 and Figure 65 compare the load current vs. output voltage of AD8610/ AD8620 and OPA627 0.1 0.00001 Figure 64. AD8610/AD8620 Dropout from ±13 V vs. Load Current 1500 2000 10 1 0.1 0.00001 Figure 65. OPA627 Dropout from ±15 V vs. Load Current ...

Page 19

... The combination of low noise, low input bias current, low input offset voltage, and low temperature drift make the AD8610/ AD8620 a perfect solution for programmable gain amplifiers. PGAs are often used immediately after sensors to increase the dynamic range of the measurement circuit. Historically, the large on resistance of switches (combined with the large I of amplifiers) created a large dc offset in PGAs ...

Page 20

... Figure 69 shows the AD8610 configured as a second-order, Butterworth, low-pass filter. With the values as shown, the corner frequency of the filter is 1 MHz. The wide bandwidth of the V+ AD8610/AD8620 allows a corner frequency up to tens of mega­ hertz. The following equations can be used for component 7 selection: ...

Page 21

... High Speed, Low Noise Differential Driver The AD8620 is a perfect candidate as a low noise differential driver for many popular ADCs. There are also other applica­ tions (such as balanced lines) that require differential drivers. The circuit of Figure unique line driver widely used in industrial applications. With ± ...

Page 22

... AD8620ARZ-REEL –40°C to +125°C AD8620ARZ-REEL7 1 –40°C to +125°C AD8620BR –40°C to +125°C AD8620BR-REEL –40°C to +125°C AD8620BR-REEL7 –40°C to +125°C 1 AD8620BRZ –40°C to +125°C 1 AD8620BRZ-REEL –40°C to +125°C 1 AD8620BRZ-REEL7 –40°C to +125° Pb-free part, # denotes lead-free product can be top or bottom marked ...

Page 23

... NOTES Rev Page AD8610/AD8620 ...

Page 24

... AD8610/AD8620 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C02730-0-11/06(E) Rev Page ...

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