Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsLinear IC - Op-amp Voltage feedback SOIC 8 EP

High Voltage, Low Noise, Low Distortion,

Unity-Gain Stable, High Speed Op Amp

Data Sheet

ADA4898-1/ADA4898-2

FEATURES

Ultralow noise

0.9 nV/√Hz

2.4 pA/√Hz

1.2 nV/√Hz at 10 Hz

Ultralow distortion: −93 dBc at 500 kHz

Wide supply voltage range: ±5 V to ±16 V

High speed

−3 dB bandwidth: 65 MHz (G = +1)

Slew rate: 55 V/µs

Unity gain stable

Low input offset voltage: 160 µV maximum

Low input offset voltage drift: 1 μV/°C

Low input bias current: −0.1 µA

Low input bias current drift: 2 nA/°C

Supply current: 8 mA

Power-down feature for single 8-lead package

APPLICATIONS

Instrumentation

Active filters

DAC buffers

SAR ADC drivers

Optoelectronics

CONNECTION DIAGRAM

–IN

+IN

–V

OUT

NC = NO CONNECT

TOP VIEW

(Not to Scale)

ADA4898-1

07037-001

Figure 1. Single 8-Lead ADA4898-1 SOIC_N_EP (RD-8-1)

07037-050

OUT1

–IN1

+IN1

–V

OUT2

–IN2

+IN2

ADA4898-2

TOP VIEW

(Not to Scale)

Figure 2. Dual 8-Lead ADA4898-2 SOIC_N_EP (RD-8-2)

GENERAL DESCRIPTION

The ADA4898-1/ADA4898-2 are ultralow noise and distortion,

unity gain stable, voltage feedback op amps that are ideal for use in

16-bit and 18-bit systems with power supplies from ±5 V to

±16 V. The ADA4898-1/ADA4898-2 feature a linear, low noise

input stage and internal compensation that achieves high slew rates

and low noise.

With the wide supply voltage range, low offset voltage, and wide

bandwidth, the ADA4898-1/ADA4898-2 are extremely versatile,

and feature a cancellation circuit that reduces input bias current.

The ADA4898-1/ADA4898-2 are available in an 8-lead SOIC

package that features an exposed metal paddle to improve power

dissipation and heat transfer to the negative supply plane. This

EPAD offers a significant thermal relief over traditional plastic

packages. The ADA4898-1/ADA4898-2 are rated to work over

the extended industrial temperature range of −40°C to +105°C.

07037-002

FREQUENCY (Hz)

VOLTAGE NOISE (nV/√Hz)

CURRENT NOISE (pA/√Hz)

0.1

10 100 1k 10k 100k

CURRENT

VOLTAGE

Figure 3. Input Voltage Noise and Current Noise vs. Frequency

Rev. E

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Summary of content (20 pages)

PAGE 1
High Voltage, Low Noise, Low Distortion, Unity-Gain Stable, High Speed Op Amp ADA4898-1/ADA4898-2 Data Sheet FEATURES CONNECTION DIAGRAM ADA4898-1 Ultralow noise 0.9 nV/√Hz 2.4 pA/√Hz 1.2 nV/√Hz at 10 Hz Ultralow distortion: −93 dBc at 500 kHz Wide supply voltage range: ±5 V to ±16 V High speed −3 dB bandwidth: 65 MHz (G = +1) Slew rate: 55 V/µs Unity gain stable Low input offset voltage: 160 µV maximum Low input offset voltage drift: 1 μV/°C Low input bias current: −0.
PAGE 2
ADA4898-1/ADA4898-2 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Test Circuits..................................................................................... 13 Applications ....................................................................................... 1 Theory of Operation ...................................................................... 14 Connection Diagram .................................
PAGE 3
Data Sheet ADA4898-1/ADA4898-2 SPECIFICATIONS ±15 V SUPPLY TA = 25°C, G = +1, RF = 0 Ω, RG open, RL = 1 kΩ to GND (for G > 1, RF = 100 Ω), unless otherwise noted. Table 1. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth Bandwidth for 0.1 dB Flatness Slew Rate Settling Time to 0.
PAGE 4
ADA4898-1/ADA4898-2 Data Sheet ±5 V SUPPLY TA = 25°C, G = +1, RF = 0 Ω, RG open, RL = 1 kΩ to GND (for G > 1, RF = 100 Ω), unless otherwise noted. Table 2. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth Bandwidth for 0.1 dB Flatness Slew Rate Settling Time to 0.
PAGE 5
Data Sheet ADA4898-1/ADA4898-2 ABSOLUTE MAXIMUM RATINGS Table 3. Rating 36 V See Figure 4 ±1.5 V ±11.4 V −65°C to +150°C −40°C to +105°C 300°C 150°C Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied.
PAGE 6
ADA4898-1/ADA4898-2 Data Sheet PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS ADA4898-1 NC 1 8 PD –IN 2 7 +VS +IN 3 6 VOUT –VS 4 5 NC NOTES 1. EXPOSED PAD CAN BE CONNECTED TO THE NEGATIVE SUPPLY (−VS) OR LEFT FLOATING. 07037-046 TOP VIEW (Not to Scale) Figure 5. Single 8-Lead SOIC_N_EP Pin Configuration Table 5. Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 8 Mnemonic NC −IN +IN −VS NC VOUT +VS PD EP Description No Connect. Inverting Input. Noninverting Input. Negative Supply.
PAGE 7
Data Sheet ADA4898-1/ADA4898-2 TYPICAL PERFORMANCE CHARACTERISTICS 2 0 –1 –2 G = +2 RF = 100Ω –3 –4 –5 G = +5 RF = 100Ω –6 –7 –8 –9 –10 RL = 1kΩ VOUT = 100mV p-p VS = ±15V –11 1 10 100 FREQUENCY (MHz) –2 G = +2 RF = 100Ω –3 –4 –5 –6 –7 G = +5 RF = 100Ω –8 –9 –10 RL = 1kΩ VOUT = 2V p-p VS = ±15V –11 1 10 100 Figure 10.
PAGE 8
ADA4898-1/ADA4898-2 Data Sheet 2 2 1 1 0 –2 –3 –4 VS = ±5V –5 –6 –7 –8 –9 –10 1 10 100 –6 –7 –8 –9 1 10 100 Figure 16. Large Signal Frequency Response for Various Supply Voltages 1.0 0.9 CL = 5pF 2 0.8 1 0.7 –1 –2 NORMALIZED GAIN (dB) CL = 0pF –3 –4 CL = 33pF –5 –6 –7 –8 CL = 15pF G = +1 RL = 1kΩ VOUT = 100mV p-p VS = ±15V –10 –11 0.5 0.4 0.3 0.2 VOUT = 0.1V p-p 0.1 0 –0.1 VOUT = 2V p-p –0.2 –0.3 G = +2 RL = 1kΩ VS = ±15V –0.4 1 10 100 FREQUENCY (MHz) –0.
PAGE 9
Data Sheet ADA4898-1/ADA4898-2 –90 –110 60 –120 50 –130 40 –140 GAIN 30 –150 20 –160 10 –170 0 –180 –10 –190 –20 100k 1M 10M 100M –105 –200 1G DISTORTION (dBc) –100 70 OPEN-LOOP PHASE (Degrees) PHASE 80 f = 100kHz G = +1 RL = 1kΩ VS = ±15V –100 FREQUENCY (Hz) –110 HD2 –115 –120 –125 HD3 –130 –135 07037-016 90 –80 1 0 G = +2, HD2, RF = 250Ω –60 –80 G = +1, HD3 G = +1, HD2 6 RL = 100Ω, HD3 –40 RL = 100Ω, HD2 –60 –80 RL = 1kΩ, HD3 –100 RL = 1kΩ, HD2 FREQUENCY (H
PAGE 10
ADA4898-1/ADA4898-2 Data Sheet 2.5 G = +1 2.0 0.08 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 0.10 G = +2 0.06 0.04 0.02 VOUT = 2V p-p G = +1 RL= 1kΩ 1.5 VS = ±5V 1.0 0.5 0 VS = ±15V 0 –0.04 07037-022 –0.02 TIME (20ns/DIV) –0.5 TIME (100ns/DIV) Figure 25. Small Signal Transient Response for Various Gains 1.5 2.0 VS = ±5V 1.0 0.5 –0.5 VOUT = 2V p-p RL = 1kΩ VS = ±15V 1.5 G = +2 1.0 0.5 VS = ±15V 0 G = +1 0 07037-023 OUTPUT VOLTAGE (V) 2.0 2.
PAGE 11
Data Sheet ADA4898-1/ADA4898-2 CMRR (dB) –40 ΔVCM = 100mV p-p –60 –80 –100 –140 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 9 3 POSITIVE SWING, VS = +5V 6 2 3 1 100 1000 0 4000 LOAD RESISTANCE (Ω) Figure 34. Output Swing vs. Load, G = +2, Load = RL // (RF + RG) Figure 31. Common-Mode Rejection Ratio (CMRR) vs. Frequency –45 –40 G = +1 RL = 1kΩ –50 VOUT = 2V p-p VOUT = 0.
PAGE 12
ADA4898-1/ADA4898-2 1000 Data Sheet 1000 N = 6180 MEAN: –0.13 SD: 0.02 VS = ±15V 800 N = 6180 MEAN: 27 SD: 20 VS = ±15V 800 COUNT 400 200 –0.20 –0.15 –0.10 –0.05 INPUT BIAS CURRENT (µA) 0 07037-032 200 0 –0.25 400 Figure 36. Input Bias Current Distribution –30 0 30 60 90 INPUT OFFSET VOLTAGE (µV) Figure 37. Input Offset Voltage Distribution, VS = ±15 V Rev. E | Page 12 of 20 Downloaded from Arrow.com.
PAGE 13
Data Sheet ADA4898-1/ADA4898-2 TEST CIRCUITS + +VS 10µF +VS 10µF + RG 0.1µF 0.1µF VOUT IN VOUT IN RL 49.9Ω RF 49.9Ω 0.1µF RL 0.1µF 10µF –VS 07037-055 07037-052 + + 10µF CL –VS Figure 38. Typical Noninverting Load Configuration Figure 41. Typical Capacitive Load Configuration +VS +VS AC 10µF + 49.9Ω 0.1µF VOUT VOUT RL RL 49.9Ω 07037-053 –VS –VS Figure 39. Positive Power Supply Rejection 10µF Figure 42.
PAGE 14
ADA4898-1/ADA4898-2 Data Sheet THEORY OF OPERATION The ADA4898-1/ADA4898-2 are voltage feedback op amps that combine unity gain stability with 0.9 nV/√Hz input noise. They employ a highly linear input stage that can maintain greater than −90 dBc (at 2 V p-p) distortion out to 600 kHz while in a unity-gain configuration. This rare combination of unity gain stability, low input-referred noise, and extremely low distortion is the result of Analog Devices, Inc.
PAGE 15
Data Sheet ADA4898-1/ADA4898-2 APPLICATIONS INFORMATION 12 HIGHER FEEDBACK RESISTOR GAIN OPERATION CF RF +VS 10µF + RF CLOSED-LOOP GAIN (dB) RF = 1kΩ 6 RF = 100Ω 3 RF = 1kΩ, CF = 2.7pF 0 –3 –6 –9 –12 –15 100k 100M 10M 1M FREQUENCY (Hz) 07037-044 The ADA4898-1/ADA4898-2 schematic for the noninverting gain configuration shown in Figure 45 is nearly a textbook example.
PAGE 16
ADA4898-1/ADA4898-2 Data Sheet NOISE CIRCUIT CONSIDERATIONS To analyze the noise performance of an amplifier circuit, identify the noise sources, and then determine if each source has a significant contribution to the overall noise performance of the amplifier. To simplify the noise calculations, noise spectral densities were used rather than actual voltages to leave bandwidth out of the expressions.
PAGE 17
Data Sheet ADA4898-1/ADA4898-2 OUTLINE DIMENSIONS 5.00 4.90 4.80 2.29 0.356 5 8 4 1 6.20 6.00 5.80 4.00 3.90 3.80 2.29 0.457 FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. BOTTOM VIEW 1.27 BSC 3.81 REF TOP VIEW SEATING PLANE 0.50 0.25 0.10 MAX 0.05 NOM COPLANARITY 0.10 0.51 0.31 8° 0° 45° 0.25 0.17 1.04 REF 1.27 0.40 06-02-2011-B 1.65 1.25 1.75 1.35 COMPLIANT TO JEDEC STANDARDS MS-012-A A Figure 48.
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ADA4898-1/ADA4898-2 Data Sheet NOTES Rev. E | Page 18 of 20 Downloaded from Arrow.com.
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Data Sheet ADA4898-1/ADA4898-2 NOTES Rev. E | Page 19 of 20 Downloaded from Arrow.com.
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ADA4898-1/ADA4898-2 Data Sheet NOTES ©2008–2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07037-0-5/15(E) Rev. E | Page 20 of 20 Downloaded from Arrow.com.