AD8655ARZ-REEL Analog Devices Inc, AD8655ARZ-REEL Datasheet

AD8655ARZ-REEL

Manufacturer Part Number

AD8655ARZ-REEL

Description

IC,Operational Amplifier,SINGLE,CMOS,SOP,8PIN,PLASTIC

Manufacturer

Analog Devices Inc

Series

DigiTrim®r

Datasheet

1.AD8655ARMZ-REEL.pdf (20 pages)

Specifications of AD8655ARZ-REEL

Design Resources

Single Supply Low Noise LED Current Source Driver Using a Current Output DAC in the Reverse Mode (CN0139)

Amplifier Type

General Purpose

Number Of Circuits

Output Type

Rail-to-Rail

Slew Rate

11 V/µs

Gain Bandwidth Product

28MHz

Current - Input Bias

1pA

Voltage - Input Offset

50µV

Current - Supply

3.7mA

Current - Output / Channel

220mA

Voltage - Supply, Single/dual (±)

2.7 V ~ 5.5 V

Operating Temperature

-40°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

8-SOIC (3.9mm Width)

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

-3db Bandwidth

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Manufacturer

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Price

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FEATURES

Low noise: 2.7 nV/√Hz @ f = 10 kHz

Low offset voltage: 250 μV max over V

Offset voltage drift: 0.4 μV/°C typ and 2.3 μV/°C max

Bandwidth: 28 MHz

Rail-to-rail input/output

Unity gain stable

2.7 V to 5.5 V operation

−40°C to +125°C operation

APPLICATIONS

ADC and DAC buffers

Audio

Industrial controls

Precision filters

Digital scales

Strain gauges

PLL filters

GENERAL DESCRIPTION

The AD8655/AD8656 are the industry’s lowest noise, precision

CMOS amplifiers. They leverage the Analog Devices DigiTrim®

technology to achieve high dc accuracy.

The AD8655/AD8656 provide low noise (2.7 nV/√Hz @ 10 kHz),

low THD + N (0.0007%), and high precision performance

(250 μV max over V

to swing rail-to-rail at the input and output enables designers

to buffer analog-to-digital converters (ADCs) and other wide

dynamic range devices in single-supply systems.

Rev. A

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.

) to low voltage applications. The ability

The high precision performance of the AD8655/AD8656

improves the resolution and dynamic range in low voltage

applications. Audio applications, such as microphone pre-amps

and audio mixing consoles, benefit from the low noise, low

distortion, and high output current capability of the AD8655/

AD8656 to reduce system level noise performance and maintain

audio fidelity. The high precision and rail-to-rail input and

output of the AD8655/AD8656 benefit data acquisition, process

controls, and PLL filter applications.

The AD8655/AD8656 are fully specified over the −40°C to

+125°C temperature range. The AD8655/AD8656 are available

in Pb-free, 8-lead MSOP and SOIC packages.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

–IN

+IN

V–

–IN

+IN

V–

NC = NO CONNECT

8-Lead MSOP (RM-8)

8-Lead SOIC (R-8)

Figure 1. AD8655

Figure 3. AD8655

(Not to Scale)

AD8655

TOP VIEW

AD8655

TOP VIEW

Precision CMOS Amplifier

PIN CONFIGURATIONS

V+

OUT

V+

OUT

AD8655/AD8656

OUT A

–IN A

+IN A

–IN A

+IN A

V–

8-Lead MSOP (RM-8)

8-Lead SOIC (R-8)

Figure 2. AD8656

Figure 4. AD8656

(Not to Scale)

Low Noise,

AD8656

TOP VIEW

AD8656

TOP VIEW

www.analog.com

V+

OUT B

–IN B

+IN B

V+

OUT B

–IN B

+IN B

Related parts for AD8655ARZ-REEL

AD8655ARZ-REEL Summary of contents

Page 1

FEATURES Low noise: 2.7 nV/√ kHz Low offset voltage: 250 μV max over V Offset voltage drift: 0.4 μV/°C typ and 2.3 μV/°C max Bandwidth: 28 MHz Rail-to-rail input/output Unity gain stable 2 5.5 ...

AD8655/AD8656 TABLE OF CONTENTS Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Typical Performance Characteristics ............................................. 6 Theory of Operation ...................................................................... 15 Applications..................................................................................... 16 Input Overvoltage Protection ................................................... 16 Input Capacitance....................................................................... 16 REVISION HISTORY 6/05—Rev Rev. A ...

Page 3

SPECIFICATIONS 25°C, unless otherwise specified Table 1. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection ...

Page 4

AD8655/AD8656 25°C, unless otherwise specified Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 3. Parameter Rating Supply Voltage 6 V Input Voltage VSS − 0 VDD + 0.3 V Differential Input Voltage ±6 V Output Short-Circuit Duration Indefinite to GND Electrostatic Discharge (HBM) 3.0 kV Storage Temperature ...

Page 6

AD8655/AD8656 TYPICAL PERFORMANCE CHARACTERISTICS –150 –100 – (μV) OS Figure 5. Input Offset Voltage Distribution 150.0 100.0 50.0 0.0 –50.0 –100.0 –150.0 – TEMPERATURE (°C) Figure 6. Input ...

Page 7

V = ±2.5V S 4.0 3.5 3.0 2.5 2.0 – TEMPERATURE (°C) Figure 11. Supply Current vs. Temperature 2500 V = ±2.5V S 2000 1500 V OH 1000 V OL 500 100 150 CURRENT ...

Page 8

AD8655/AD8656 110.00 107.00 104.00 101.00 98.00 95.00 92.00 – TEMPERATURE (°C) Figure 17. Large Signal CMRR vs. Temperature 100 +PSRR 80 –PSRR 100 1k 10k 100k FREQUENCY (Hz) Figure 18. Small Signal PSSR vs. ...

Page 9

V = ±2. 11.5pF 100 LOAD PHASE MARGIN = 69° –20 –40 10k 100k 1M 10M FREQUENCY (Hz) Figure 23. Open-Loop Gain and Phase vs. Frequency 140. ±2.5V S ...

Page 10

AD8655/AD8656 ±2. 200mV – + 100 150 200 CAPACITANCE (pF) Figure 29. Small Signal Overshoot vs. Load Capacitance T 300mV ...

Page 11

V/ ° C) |TCV OS Figure 35. |TCV | Distribution OS 4 ±1.35V S 4.0 3.5 3.0 2.5 2.0 ...

Page 12

AD8655/AD8656 OUT 2 20 μ s/DIV Figure 41. No Phase Reversal V = ±1.35V 50pF L GAIN = +1 2 TIME (10μs/DIV) Figure 42. Large Signal Response T 2 TIME (1μs/DIV) Figure 43. ...

Page 13

FREQUENCY (Hz) Figure 47. CMRR vs. Frequency 102.00 98.00 94.00 90.00 86.00 – TEMPERATURE (°C) Figure 48. Large Signal CMRR vs. Temperature 100 +PSRR 80 –PSRR 60 ...

Page 14

AD8655/AD8656 3.0 2 1.35V 2. LOAD 1.5 1.0 0.5 0 10k 100k FREQUENCY (Hz) Figure 53. Maximum Output Swing vs. Frequency 1000 V = ±1.35V S 100 G = ...

Page 15

THEORY OF OPERATION The AD8655/AD8656 amplifiers are voltage feedback, rail-to- rail input and output precision CMOS amplifiers, which operate from 2 5 power supply voltage. These amplifiers use the Analog Devices DigiTrim technology to achieve a ...

Page 16

AD8655/AD8656 APPLICATIONS INPUT OVERVOLTAGE PROTECTION The internal protective circuitry of the AD8655/AD8656 allows voltages exceeding the supply to be applied at the input recommended, however, not to apply voltages that exceed the supplies by more than 0.3 V ...

Page 17

THD Readings vs. Common-Mode Voltage Total harmonic distortion of the AD8655/AD8656 is well below 0.0007% with a load of 1 kΩ. This distortion is a function of the circuit configuration, the voltage applied, and the layout, in addition to other ...

Page 18

AD8655/AD8656 LAYOUT, GROUNDING, AND BYPASSING CONSIDERATIONS POWER SUPPLY BYPASSING Power supply pins can act as inputs for noise, so care must be taken to apply a noise-free, stable dc voltage. The purpose of bypass capacitors is to create low impedances ...

Page 19

... Dimensions shown in millimeters and (inches) ORDERING GUIDE Temperature Model Range 1 AD8655ARZ −40°C to +125°C 1 AD8655ARZ-REEL −40°C to +125°C 1 AD8655ARZ-REEL7 −40°C to +125°C 1 AD8655ARMZ-REEL −40°C to +125°C 1 AD8655ARMZ-R2 −40°C to +125°C 1 AD8656ARZ −40°C to +125°C 1 AD8656ARZ-REEL − ...

Page 20

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