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Ultralow Noise Amplifier at Lower Power

Data Sheet

ADA4075-2

Rev. C Document Feedback

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FEATURES

Ultralow noise: 2.8 nV/√Hz at 1 kHz typical

Ultralow distortion: 0.0002% typical

Low supply current: 1.8 mA per amplifier typical

Offset voltage: 1 mV maximum

Bandwidth: 6.5 MHz typical

Slew rate: 12 V/μs typical

Dual-supply operation: ±4.5 V to ±18 V

Unity-gain stable

Extended industrial temperature range

8-lead SOIC and 2 mm × 2 mm LFCSP packages

APPLICATIONS

Precision instrumentation

Professional audio

Active filters

Low noise amplifier front end

Integrators

PIN CONFIGURATIONS

OUTA 1

–INA 2

+INA 3

V–

V+8

OUTB7

–INB6

+INB

ADA4075-2

TOP VIEW

(Not to Scale)

7642-001

Figure 1. 8-Lead SOIC

07642-002

TOP VIEW

(Not to Scale)

ADA4075-2

3+INA

4V–

1OUTA

2–INA

6–INB

5+INB

8V+

7OUTB

Figure 2. 8-Lead, 2 mm × 2 mm LFCSP

GENERAL DESCRIPTION

The ADA4075-2 is a dual, high performance, low noise operational

amplifier combining excellent dc and ac characteristics on the

Analog Devices, Inc., iPolar® process. The iPolar process is an

advanced bipolar technology implementing vertical junction

isolation with lateral trench isolation. This allows for low noise

performance amplifiers in smaller die size at faster speed and

lower power. Its high slew rate, low distortion, and ultralow

noise make the ADA4075-2 ideal for high fidelity audio and

high performance instrumentation applications. It is also

especially useful for lower power demands, small enclosures,

and high density applications. The ADA4075-2 is specified for

the −40°C to +125°C temperature range and is available in a

standard SOIC package and a 2 mm × 2 mm LFCSP package.

Table 1. Low Noise Precision Op Amps

Supply 44 V 36 V 12 V to 16 V 5 V

Single OP27 AD8671 AD8665 AD8605

AD8675 OP162 AD8655

AD8597 AD8691

ADA4004-1

AD797

Dual OP275 AD8672 AD8666 AD8606

AD8676 OP262 AD8656

AD8599 AD8692

ADA4004-2

Quad AD8674 AD8668 AD8608

ADA4004-4 OP462 AD8694

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Summary of content (24 pages)

PAGE 1
Ultralow Noise Amplifier at Lower Power ADA4075-2 Data Sheet PIN CONFIGURATIONS Ultralow noise: 2.8 nV/√Hz at 1 kHz typical Ultralow distortion: 0.0002% typical Low supply current: 1.8 mA per amplifier typical Offset voltage: 1 mV maximum Bandwidth: 6.5 MHz typical Slew rate: 12 V/μs typical Dual-supply operation: ±4.
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ADA4075-2 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Applications Information .............................................................. 16 Applications ....................................................................................... 1 Input Protection ......................................................................... 16 Pin Configurations ......................................................
PAGE 3
Data Sheet ADA4075-2 SPECIFICATIONS VSY = ±15 V, VCM = 0 V, TA = 25°C, SOIC package, unless otherwise noted. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol Conditions Min VOS Typ Max Unit 0.2 1 1.2 100 150 50 75 +12.
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ADA4075-2 Data Sheet VSY = ±15 V, VCM = 0 V, TA = 25°C, LFCSP package, unless otherwise noted. Table 3. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol Conditions Min VOS Typ Max Unit 0.3 1 1.5 100 150 50 75 +12.
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Data Sheet ADA4075-2 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 4. Parameter Supply Voltage Input Voltage Input Current1 Differential Input Voltage Output Short-Circuit Duration to GND Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature (Soldering, 60 sec) 1 θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. This was measured using a standard 4-layer board.
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ADA4075-2 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. 250 250 200 NUMBER OF AMPLIFIERS 150 100 VSY = ±5V VCM = 0V BASED ON 600 OP AMPS SOIC PACKAGE 150 100 –0.5 0 0.5 1.0 VOS (mV) 0 –1.0 07642-003 0 –1.0 1.0 100 VSY = ±15V VCM = 0V BASED ON 300 OP AMPS LFCSP PACKAGE 80 NUMBER OF AMPLIFIERS 60 40 VSY = ±5V VCM = 0V BASED ON 300 OP AMPS LFCSP PACKAGE 60 40 20 20 –0.5 0 0.5 1.0 VOS (mV) 0 –1.0 07642-040 0 –1.0 0 0.5 1.
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Data Sheet ADA4075-2 40 40 VSY = ±15V VCM = 0V BASED ON 300 OP AMPS LFCSP PACKAGE VSY = ±5V VCM = 0V BASED ON 300 OP AMPS LFCSP PACKAGE 35 30 NUMBER OF AMPLIFIERS 25 20 15 10 5 30 25 20 15 10 1 2 3 4 5 TCVOS (µV/°C) 6 8 7 0 0 Figure 9. Input Offset Voltage Drift Distribution 100 VOS (μV) 100 0 –100 –200 –200 0 5 6 7 8 0 –100 –5 4 5 TCVOS (µV/°C) VSY = ±5V BASED ON 60 OP AMPS 200 –10 3 300 VSY = ±15V BASED ON 60 OP AMPS 200 –300 –15 2 Figure 12.
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ADA4075-2 Data Sheet 60 60 VSY = ±5V 50 40 40 30 20 20 10 10 –5 0 5 10 15 VCM (V) 0 –4 OUTPUT VOLTAGE TO SUPPLY RAIL (V) V+ – VOH 1 VOL – V– 0.1 1 10 100 LOAD CURRENT (mA) OUTPUT VOLTAGE TO SUPPLY RAIL (V) 1.5 VOL – V– –25 0 25 50 75 100 TEMPERATURE (°C) 125 VOL – V– 0.01 0.1 1 10 100 VSY = ±5V RL = 2kΩ V+ – VOH 1.5 1.0 VOL – V– 0.5 –25 0 25 50 75 100 TEMPERATURE (°C) Figure 20. Output Voltage to Supply Rail vs. Temperature Figure 17.
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Data Sheet ADA4075-2 120 100 100 80 80 60 60 60 40 40 PHASE 20 20 GAIN 0 0 120 100 PHASE 80 60 GAIN 40 40 20 20 0 0 –20 –20 –40 –40 –40 –40 –60 –60 –60 –60 –80 –80 –80 –80 10k 100k 1M –100 100M 10M FREQUENCY (Hz) –20 –100 1k 07642-015 –100 1k –20 10k 100k 1M FREQUENCY (Hz) Figure 21. Open-Loop Gain and Phase vs. Frequency Figure 24. Open-Loop Gain and Phase vs.
PAGE 10
ADA4075-2 Data Sheet 140 120 100 100 CMRR (dB) 120 80 60 80 60 40 40 20 20 0 100 1k 10k 100k 1M 10M FREQUENCY (Hz) VSY = ±5V 0 100 1k 100k 10k Figure 30. CMRR vs. Frequency Figure 27. CMRR vs. Frequency 120 120 VSY = ±5V 100 80 80 60 PSRR– PSRR+ 40 60 20 20 0 0 –20 10 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) PSRR– PSRR+ 40 –20 10 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) 07642-025 PSRR (dB) 100 07642-022 Figure 31. PSRR vs.
PAGE 11
Data Sheet ADA4075-2 VSY = ±5V VIN = 7V p-p AV = +1 RL = 2kΩ CL = 100pF VOLTAGE (2V/DIV) TIME (4µs/DIV) Figure 33. Large Signal Transient Response Figure 36. Large Signal Transient Response VOLTAGE (20mV/DIV) VSY = ±15V VIN = 100mV p-p AV = +1 RL = 2kΩ CL = 100pF VSY = ±5V VIN = 100mV p-p AV = +1 RL = 2kΩ CL = 100pF 07642-028 0V TIME (10µs/DIV) Figure 37.
PAGE 12
ADA4075-2 Data Sheet 4 4 VSY = ±5V VSY = ±15V 2 2 INPUT INPUT 10 5 4 2 OUTPUT 0 0 –5 –2 07642-033 OUTPUT –2 –10 TIME (1µs/DIV) –4 TIME (1µs/DIV) Figure 42. Positive Overload Recovery Figure 39.
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Data Sheet ADA4075-2 10 10 VSY = ±5V 100 1k 10k 100k FREQUENCY (Hz) 1 1 10 CURRENT NOISE DENSITY (pA/ Hz) CURRENT NOISE DENSITY (pA/ Hz) 10 RS2 UNCORRELATED RS1 = 0Ω 1 0.1 10 100 1k 10k 100k FREQUENCY (Hz) 07642-045 CORRELATED RS1 = RS2 1 100k VSY = ±5V 100k RS1 RS2 UNCORRELATED RS1 = 0Ω 1 CORRELATED RS1 = RS2 0.1 1 10 100 1k 10k FREQUENCY (Hz) Figure 49. Current Noise Density Figure 46.
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ADA4075-2 Data Sheet 6 8 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 5 6 +125°C +85°C 4 +25°C –40°C 2 VSY = ±15V 4 VSY = ±5V 3 2 4 8 6 12 10 14 16 18 SUPPLY VOLTAGE (±V) 0 –50 07642-048 0 25 50 75 100 125 Figure 54. Supply Current vs. Temperature 10 VSY = ±15V f = 1kHz 1 1 0.1 0.1 THD + NOISE (%) THD + NOISE (%) 0 TEMPERATURE (°C) Figure 51. Supply Current vs. Supply Voltage 10 –25 07642-057 1 0.01 0.001 VSY = ±5V f = 1kHz 0.01 600Ω 0.001 600Ω 0.0001 2kΩ 0.
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Data Sheet ADA4075-2 0 0 1kΩ –40 RL –60 –80 –100 –40 RL –60 –80 –100 1k 10k 100k FREQUENCY (Hz) –140 100 07642-041 –140 100 10k 100k FREQUENCY (Hz) Figure 57. Channel Separation vs. Frequency 10 1k 07642-044 –120 –120 Figure 60. Channel Separation vs. Frequency 1 VSY = ±18V f = 1kHz 1 VSY = ±18V VIN = 8V rms 0.1 THD + NOISE (%) 0.
PAGE 16
ADA4075-2 Data Sheet APPLICATIONS INFORMATION 1 INPUT PROTECTION ADA4075-2 R1 2 1 07642-050 R2 3 Figure 63. Input Protection TOTAL HARMONIC DISTORTION VSY = ±4V RL = 2kΩ VIN = 1.5V rms 0.01 0.0001 10 100 1k 10k 100k FREQUENCY (Hz) Figure 64. THD + Noise vs.
PAGE 17
Data Sheet ADA4075-2 DAC OUTPUT FILTER For a DAC output filter, an op amp with reasonable slew rate and bandwidth is required. The ADA4075-2 has a high slew rate of the 12 V/µs and a relatively wide bandwidth of 6.5 MHz. The cutoff frequency of the low-pass filter is approximately 167 kHz. In addition, the 100 kΩ − 47 µF RC network provides ac coupling to block out the dc components at the output.
PAGE 18
ADA4075-2 Data Sheet BALANCED LINE DRIVER Finally, even with these precautions, it is vital that the positive feedback be accurately controlled. This is partly achieved by using 1% resistors. In addition, the following setup procedure ensures that the positive feedback does not become excessive: The circuit of Figure 67 shows a balanced line driver designed for audio use. Such drivers are intended to mimic an output transformer in operation, whereby the common-mode voltage can be impressed by the load.
PAGE 19
Data Sheet ADA4075-2 BALANCED LINE RECEIVER Note that A3 is not in the signal path, and almost any op amp works well here. Although it may seem as though the inverting output should be noisier than the noninverting one, they are in fact symmetric at about −111 dBV (20 kHz bandwidth). Figure 68 depicts a unity-gain balanced line receiver capable of a high degree of hum rejection.
PAGE 20
ADA4075-2 Data Sheet LOW NOISE PARAMETRIC EQUALIZER The bandwidth control adjusts the Q from 0.9 to about 11. The overall noise is setting dependent, but with all controls centered, it is about −104 dBV in a 20 kHz bandwidth. Such a low noise level can obviate the need for a bypass switch in many applications. The circuit in Figure 69 is a reciprocal parametric equalizer yielding ±20 dB of cut or boost with variable bandwidth and frequency. The frequency control range is 6.
PAGE 21
Data Sheet ADA4075-2 SCHEMATIC V+ +INA/ +INB OUTA/ OUTB V– Figure 70. Simplified Schematic Rev. C | Page 21 of 24 Downloaded from Arrow.com.
PAGE 22
ADA4075-2 Data Sheet OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 8 4.00 (0.1574) 3.80 (0.1497) 1 5 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 6.20 (0.2441) 5.80 (0.2284) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.
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Data Sheet ADA4075-2 NOTES Rev. C | Page 23 of 24 Downloaded from Arrow.com.
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ADA4075-2 Data Sheet NOTES ©2008–2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07642-0-11/13(C) Rev. C | Page 24 of 24 Downloaded from Arrow.com.