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ADA4896-2/ADA4897-1/ADA4897-2: 1 nV/?Hz, Low Power, Rail-to-Rail Output Amplifiers

ADA4896-2/ADA4897-1/ADA4897-2: 1 nV/?Hz, Low Power, Rail-to-Rail Output Amplifiers

Product catalog summary

Features
The ADA4896-2/ADA4897-1/ADA4897-2 amplifiers are characterized by low wideband noise of 1 nV/√Hz, low distortion of -115 dBc at 100 kHz, and low power consumption of 3 mA per amplifier. They offer high speed with a -3 dB bandwidth of 230 MHz and a slew rate of 120 V/μs. These amplifiers support a wide supply range from 3 V to 10 V and feature rail-to-rail output.

Applications
These amplifiers are suitable for low noise preamplifiers, ultrasound amplifiers, PLL loop filters, high-performance ADC drivers, and DAC buffers.

General Description
The ADA4896-2/ADA4897-1/ADA4897-2 are unity-gain stable, low noise, rail-to-rail output, high-speed voltage feedback amplifiers. They are designed for applications requiring high dynamic range, precision, low power, and high speed. The amplifiers are built using Analog Devices' proprietary SiGe bipolar process.

Specifications
The amplifiers have a dynamic performance with a -3 dB bandwidth of 230 MHz at G = +1 and a slew rate of 120 V/μs. They exhibit low noise with an input voltage noise of 1 nV/√Hz at 100 kHz and input current noise of 2.8 pA/√Hz at 100 kHz. The amplifiers operate over a temperature range of -40°C to +125°C.

Performance Characteristics
The amplifiers demonstrate excellent harmonic distortion performance with SFDR of -115 dBc at 100 kHz and -80 dBc at 2 MHz. They also have a high open-loop gain of 110 dB.

Applications Information
The document provides detailed applications information, including typical performance values, low noise gain selectable amplifier configurations, and medical ultrasound applications.

Ordering and Packaging
The ADA4896-2 is available in 8-lead LFCSP and MSOP packages, the ADA4897-1 in 8-lead SOIC and 6-lead SOT-23 packages, and the ADA4897-2 in a 10-lead MSOP package.

Input Characteristics
- Input Resistance: Common-Mode is 10 MΩ, Differential is 10 kΩ.
- Input Capacitance: Common-Mode is 3 pF, Differential is 11 pF.
- Input Common-Mode Voltage Range: 0.1 to 4.1 V.
- Common-Mode Rejection Ratio (CMRR): VCM = 1 V to 4 V, ranges from -91 to -118 dB.

Output Characteristics
- Output Overdrive Recovery Time: 96 ns for VIN = 0 V to 5 V, G = +2.
- Output Voltage Swing: Positive swing is 4.85 to 4.98 V for RL = 1 kΩ, and 4.8 to 4.88 V for RL = 100 Ω. Negative swing is 0.15 to 0.014 V for RL = 1 kΩ, and 0.2 to 0.08 V for RL = 100 Ω.
- Output Current: SFDR = -45 dBc, 70 mA.
- Short-Circuit Current: Sinking/sourcing 125 mA.
- Capacitive Load Drive: 30% overshoot, G = +2, 39 pF.

Power Supply
- Operating Range: 3 to 10 V.
- Quiescent Current per Amplifier: 2.6 to 2.9 mA, DISABLE = 0 V, 0.05 to 0.18 mA.
- Power Supply Rejection Ratio (PSRR): Positive +VS = 4.5 V to 5.5 V, -VS = 0 V, ranges from -96 to -123 dB. Negative +VS = 5 V, -VS = -0.5 V to +0.5 V, ranges from -96 to -121 dB.

Disable Pin
- DISABLE Voltage: Enabled >+VS - 0.5 V, Disabled <+VS - 2 V.
- Input Current: Enabled DISABLE = +5 V, -1.2 μA. Disabled DISABLE = 0 V, -20 μA.
- Switching Speed: Enabled 0.25 μs, Disabled 12 μs.

Dynamic Performance
- -3 dB Bandwidth: G = +1, VOUT = 0.02 V p-p, 230 MHz; G = -1, VOUT = 1 V p-p, 45 MHz; G = +2, VOUT = 0.02 V p-p, 90 MHz.
- Bandwidth for 0.1 dB Flatness: G = +2, VOUT = 2 V p-p, RL = 100 Ω, 7 MHz.
- Slew Rate: G = +2, VOUT = 1 V step, 85 V/μs.
- Settling Time to 0.1%: G = +2, VOUT = 2 V step, 45 ns.
- Settling Time to 0.01%: G = +2, VOUT = 2 V step, 96 ns.

Noise/Harmonic Performance
- Harmonic Distortion (SFDR): fC = 100 kHz, VOUT = 2 V p-p, G = +2, -105 dBc; fC = 1 MHz, VOUT = 1 V p-p, G = -1, -84 dBc; fC = 2 MHz, VOUT = 1 V p-p, G = -1, -77 dBc; fC = 5 MHz, VOUT = 1 V p-p, G = -1, -60 dBc.
- Input Voltage Noise: f = 10 Hz, 2.3 nV/√Hz; f = 100 kHz, 1 nV/√Hz.
- Input Current Noise: f = 10 Hz, 11 pA/√Hz; f = 100 kHz, 2.8 pA/√Hz.
- 0.1 Hz to 10 Hz Noise: G = +101, RF = 1 kΩ, RG = 10 Ω, 99 nV p-p.

DC Performance
- Input Offset Voltage: -500 to +500 μV.
- Input Offset Voltage Drift: 0.2 μV/°C.
- Input Bias Current: -17 to -4 μA.
- Input Bias Current Drift: 3 nA/°C.
- Input Bias Offset Current: -0.6 to +0.6 μA.
- Open-Loop Gain: VOUT = 0.5 V to 2.5 V, 95 to 108 dB.

Absolute Maximum Ratings
- Supply Voltage: 11 V.
- Common-Mode Input Voltage: -VS - 0.7 V to +VS + 0.7 V.
- Differential Input Voltage: ±0.7 V.
- Storage Temperature Range: -65°C to +125°C.
- Operating Temperature Range: -40°C to +125°C.
- Lead Temperature (Soldering 10 sec): 300°C.
- Junction Temperature: 150°C.

Thermal Resistance
- 8-Lead Dual MSOP (ADA4896-2): 222 °C/W.
- 8-Lead Dual LFCSP (ADA4896-2): 61 °C/W.
- 8-Lead Single SOIC (ADA4897-1): 133 °C/W.
- 6-Lead Single SOT-23 (ADA4897-1): 150 °C/W.
- 10-Lead Dual MSOP (ADA4897-2): 210 °C/W.

Maximum Power Dissipation
The maximum safe power dissipation is limited by the rise in junction temperature on the die. Exceeding a junction temperature of 175°C for an extended period can result in degradation or loss of functionality.

Pin Configurations and Function Descriptions
- ADA4896-2: 8-Lead LFCSP and MSOP configurations.
- ADA4897-1: 8-Lead SOIC and 6-Lead SOT-23 configurations.
- ADA4897-2: 10-Lead MSOP configuration.

Typical Performance Characteristics
Various graphs illustrate frequency response, harmonic distortion, noise, transient response, and other performance metrics under different conditions.

Overview
The document is a technical data sheet for the ADA4896-2, ADA4897-1, and ADA4897-2 amplifiers, which are low noise, high-speed amplifiers designed for a variety of applications. These amplifiers are characterized by their low input noise, high bandwidth, and robust input protection.

Specifications
The amplifiers operate with a supply voltage range from 3V to 10V and consume 3mA of current. They offer a bandwidth exceeding 200 MHz and are unity-gain stable. The maximum offset voltage is 500 μV with a drift of 0.2 μV/°C.

Input Protection
The amplifiers are protected against ESD events, withstanding up to 2.5 kV for human body model and 1 kV for charged-device model. Input protection is provided by an ESD network and diode clamps.

Disable Operation
The ADA4897-1/ADA4897-2 feature a disable function that reduces supply current to approximately 18 μA when the DISABLE pin is activated. The disable pin is also protected by ESD clamps.

DC Errors
The document provides equations for calculating DC errors due to offset voltage and input currents. It also discusses bias current cancellation techniques using resistors RBP and RBN.

Noise Considerations
The amplifiers have a low input voltage noise of 1 nV/√Hz and input current noise of 2.8 pA/√Hz. The document provides formulas for calculating output noise spectral density and recommends maintaining feedback resistor values between 250 Ω and 1 kΩ to minimize noise.

Capacitance Drive
The document discusses the effects of capacitive loads on amplifier stability and suggests using a snub resistor to mitigate peaking in the frequency response.

Applications Information
The document includes typical performance values for various gains and provides a reference table for component values and performance parameters. It also describes a gain-selectable amplifier configuration using the ADA4896-2 and ADG633 switches.

Medical Ultrasound Applications
The document briefly mentions the use of these amplifiers in medical ultrasound applications, specifically in beamforming and signal processing tasks.

Overview of the Ultrasound System
The document provides a detailed overview of medical ultrasound systems, highlighting their role in generating images of internal organs, mapping blood flow, and providing blood velocity information. The system primarily operates through time gain control (TGC) and continuous wave (CW) Doppler operations, with the AD9279 integrating essential components like a variable gain amplifier (VGA), low noise preamplifier (LNA), antialiasing filter (AAF), analog-to-digital converter (ADC), and I/Q demodulator.

ADA4896-2/ADA4897-1/ADA4897-2 in Ultrasound Systems
These components are used in the CW Doppler path post I/Q demodulators of the AD9279. They are ideal for processing weak Doppler signals due to their low noise floor and high dynamic range. The ADA4896-2/ADA4897-1/ADA4897-2 serve as I-to-V converters, current summers, and ADC drivers, with two stages of amplification for I-to-V conversion and current summation.

Layout Considerations
Optimal performance requires careful board layout, signal routing, power supply bypassing, and grounding. Avoiding ground in areas around the input and output of the amplifiers is crucial to prevent instability caused by stray capacitance. Power supply bypassing should involve parallel capacitors to ensure low AC impedance across frequencies, minimizing noise coupling into the amplifier.

Outline Dimensions
The document includes detailed dimensions for various package types like MSOP, LFCSP, SOIC, and SOT-23, compliant with JEDEC standards, providing measurements in millimeters and inches for design reference.

Ordering Guide
The guide lists various models of ADA4896-2 and ADA4897-1/2, detailing temperature ranges, package descriptions, options, ordering quantities, and branding, ensuring compliance with RoHS standards.

Catalog excerpts

ADA4896-2/ADA4897-1/ADA4897-2: 1 nV/?Hz, Low Power, Rail-to-Rail Output Amplifiers-1

Low noise preamplifier Ultrasound amplifiers PLL loop filters High performance ADC drivers DAC buffers Figure 2. Voltage Noise vs. Frequency GENERAL DESCRIPTION The ADA4896-2/ADA4897-1/ADA4897-2 are unity-gain stable, low noise, rail-to-rail output, high speed voltage feedback amplifiers that have a quiescent current of 3 mA. With a 1/f noise of 2.4 nV/√Hz at 10 Hz and a spurious-free dynamic range of −80 dBc at 2 MHz, the ADA4896-2/ADA4897-1/ADA4897-2 are ideal solutions in a variety of applications, including ultrasound, low noise preamplifiers, and drivers of high performance ADCs. The Analog Devices, Inc., proprietary next-generation SiGe bipolar process and innovative architecture enable such high performance amplifiers. The ADA4896-2/ADA4897-1/ADA4897-2 have 230 MHz bandwidth, 120 V/μs slew rate, and settle to 0.1% in 45 ns. With a wide supply voltage range of 3 V to 10 V, the ADA4896-2/ ADA4897-1/ADA4897-2 are ideal candidates for systems that require high dynamic range, precision, low power, and high speed. The ADA4896-2 is available in 8-lead LFCSP and 8-lead MSOP packages. The ADA4897-1 is available in 8-lead SOIC and 6-lead SOT-23 packages. The ADA4897-2 is available in a 10-lead MSOP package. The ADA4896-2/ADA4897-1/ADA4897-2 operate over the extended industrial temperature range of −40°C to +125°C. FUNCTIONAL BLOCK DIAGRAM VOLTAGE NOISE (nV/√Hz) Low wideband noise 1 nV/√Hz 2.8 pA/√Hz Low 1/f noise: 2.4 nV/√Hz at 10 Hz Low distortion: −115 dBc at 100 kHz, VOUT = 2 V p-p Low power: 3 mA per amplifier Low input offset voltage: 0.5 mV maximum High speed −3 dB bandwidth: 230 MHz (G = +1) Slew rate: 120 V/μs Settling time to 0.1%: 45 ns Rail-to-rail output Wide supply range: 3 V to 10 V Disable feature (ADA4897-1/ADA4897-2) Data Sheet 1 nV/√Hz, Low Power, Rail-to-Rail Output Amplifiers ADA4896-2/ADA4897-1/ADA4897-2 Table 2. Complementary ADCs Part No. AD7944 AD7985 AD7986 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. Trademarks and registered trademarks are the property of their respective owners. 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 ©2012 Analog Devices, Inc. All rights reserved.

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ADA4896-2/ADA4897-1/ADA4897-2: 1 nV/?Hz, Low Power, Rail-to-Rail Output Amplifiers-2

Powered by TCPDF (www.tcpdf.org) IMPORTANT LINKS for the ADA4896-2_4897-1_4897-2* Last content update 07/24/2013 06:07 pm PARAMETRIC SELECTION TABLES DESIGN TOOLS, MODELS, DRIVERS & SOFTWARE Find Similar Products By Operating Parameters Analog Filter Wizard 2.0 ADA44896/7 SPICE Macro Model, Ver. 2.1 DOCUMENTATION AN-0991: Active Filter Evaluation Board for Standard SOIC Op Amps AN-581: Biasing and Decoupling Op Amps in Single Supply Applications AN-402: Replacing Output Clamping Op Amps with Input Clamping Amps ADA4895 / 6 / 7 Fastest, Low Noise, Low Power, Rail-to-Rail Amps Op Amp Applications...

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ADA4896-2/ADA4897-1/ADA4897-2: 1 nV/?Hz, Low Power, Rail-to-Rail Output Amplifiers-3

Data Sheet

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ADA4896-2/ADA4897-1/ADA4897-2: 1 nV/?Hz, Low Power, Rail-to-Rail Output Amplifiers-4

Data Sheet SPECIFICATIONS ±5 V SUPPLY TA = 25°C, G = +1, RL = 1 kΩ to ground, unless otherwise noted. Table 3. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth Bandwidth for 0.1 dB Flatness Slew Rate Settling Time to 0.1% Settling Time to 0.01% NOISE/HARMONIC PERFORMANCE Harmonic Distortion (SFDR) Input Voltage Noise Input Current Noise 0.1 Hz to 10 Hz Noise DC PERFORMANCE Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Bias Current Drift Input Bias Offset Current Open-Loop Gain INPUT CHARACTERISTICS Input Resistance Common-Mode Differential Input Capacitance Common-Mode...

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ADA4896-2/ADA4897-1/ADA4897-2: 1 nV/?Hz, Low Power, Rail-to-Rail Output Amplifiers-5

ADA4896-2/ADA4897-1/ADA4897-2 Parameter POWER SUPPLY Operating Range Quiescent Current per Amplifier Data Sheet Test Conditions/Comments Enabled Disabled DISABLE = −5 V Power Supply Rejection Ratio (PSRR) Positive Negative DISABLE PIN (ADA4897-1/ADA4897-2) DISABLE Voltage Input Current Enabled Disabled Switching Speed Enabled Disabled +5 V SUPPLY TA = 25°C, G = +1, RL = 1 kΩ to midsupply, unless otherwise noted. Table 4. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth Bandwidth for 0.1 dB Flatness Slew Rate Settling Time to 0.1% Settling Time to 0.01% NOISE/HARMONIC PERFORMANCE Harmonic Distortion...

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ADA4896-2/ADA4897-1/ADA4897-2: 1 nV/?Hz, Low Power, Rail-to-Rail Output Amplifiers-6

Data Sheet Parameter INPUT CHARACTERISTICS Input Resistance Common-Mode Differential Input Capacitance Common-Mode Differential Input Common-Mode Voltage Range Common-Mode Rejection Ratio (CMRR) OUTPUT CHARACTERISTICS Output Overdrive Recovery Time Output Voltage Swing Positive Negative Output Current Short-Circuit Current Capacitive Load Drive POWER SUPPLY Operating Range Quiescent Current per Amplifier Input Current Enabled Disabled Switching Speed Enabled Disabled Enabled Disabled VIN = 0 V to 5 V, G = +2 RL = 1 kΩ RL = 100 Ω RL = 1 kΩ RL = 100 Ω SFDR = −45 dBc Sinking/sourcing 30% overshoot,...

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ADA4896-2/ADA4897-1/ADA4897-2: 1 nV/?Hz, Low Power, Rail-to-Rail Output Amplifiers-7

Data Sheet +3 V SUPPLY TA = 25°C, G = +1, RL = 1 kΩ to midsupply, unless otherwise noted. Table 5. Parameter DYNAMIC PERFORMANCE −3 dB Bandwidth Bandwidth for 0.1 dB Flatness Slew Rate Settling Time to 0.1% Settling Time to 0.01% NOISE/HARMONIC PERFORMANCE Harmonic Distortion (SFDR) Input Voltage Noise Input Current Noise 0.1 Hz to 10 Hz Noise DC PERFORMANCE Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Bias Current Drift Input Bias Offset Current Open-Loop Gain INPUT CHARACTERISTICS Input Resistance Common-Mode Differential Input Capacitance Common-Mode Differential...

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ADA4896-2/ADA4897-1/ADA4897-2: 1 nV/?Hz, Low Power, Rail-to-Rail Output Amplifiers-8

Data Sheet Parameter Power Supply Rejection Ratio (PSRR) Positive Negative DISABLE PIN (ADA4897-1/ADA4897-2) DISABLE Voltage Input Current Enabled Disabled Switching Speed Enabled Disabled Enabled Disabled

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ADA4896-2/ADA4897-1/ADA4897-2: 1 nV/?Hz, Low Power, Rail-to-Rail Output Amplifiers-9

Data Sheet ABSOLUTE MAXIMUM RATINGS Table 6. Rating 11 V See Figure 3 −VS − 0.7 V to +VS + 0.7 V 0.7 V −65°C to +125°C −40°C to +125°C 300°C 150°C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. THERMAL RESISTANCE θJA is specified for the worst-case conditions,...

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