Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsLinear IC - Op-amp Multi-purpose SOIC 8

30 V, Low Noise, Rail-to-Rail

I/O, Low Power Operational Amplifier

Data Sheet

ADA4084-2

Rev. C Document Feedback

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FEATURES

Rail-to-rail input/output

Low power: 625 µA typical

Gain bandwidth product: 15.9 MHz at A

=100 typical

Unity-gain crossover: 9.9 MHz typical

−3 dB closed-loop bandwidth: 13.9 MHz typical at ±15 V

Low offset voltage: 100 μV maximum (SOIC)

Unity-gain stable

High slew rate: 4.6 V/μs typical

Low noise: 3.9 nV/√Hz typical at 1 kHz

APPLICATIONS

Battery-powered instrumentation

Power supply control and protection

Telecommunications

DAC output amplifier

ADC input buffer

GENERAL DESCRIPTION

The ADA4084-2 is a dual, single-supply, 10 MHz bandwidth

amplifier featuring rail-to-rail inputs and outputs. It is guaran-

teed to operate from 3 V to 30 V (or ±1.5 V to ±15 V).

These amplifiers are well suited for single-supply applications

requiring both ac and precision dc performance. The combina-

tion of wide bandwidth, low noise, and precision makes the

ADA4084-2 useful in a wide variety of applications, including

filters and instrumentation.

Other applications for these amplifiers include portable telecom-

munications equipment, power supply control and protection,

and use as amplifiers or buffers for transducers with wide output

ranges. Sensors requiring a rail-to-rail input amplifier include

Hall effect, piezoelectric, and resistive transducers.

The ability to swing rail-to-rail at both the input and output

enables designers to build multistage filters in single-supply

systems and to maintain high signal-to-noise ratios.

The ADA4084-2 is specified over the industrial temperature

range of −40°C to +125°C. The dual ADA4084-2 is available in

the 8-lead SOIC, MSOP, and LFCSP surface-mount packages.

PIN CONFIGURATION

OUT B

–IN B

+IN B

V+

OUT A

–IN A

+IN A

V–

ADA4084-2

TOP VIEW

(Not to Scale)

NOTES

1. FOR THE LFSCP PACKAGE THE

EXPOSED PAD MUST BE

CONNECTED TO V–.

08237-001

Figure 1. 8-Lead MSOP (RM)

8-Lead SOIC (R)

8-Lead LFCSP (CP)

The ADA4084-2 is a member of a growing series of high voltage,

low noise op amps offered by Analog Devices, Inc., (see Table 1).

For a more complete selection table of low input voltage noise

amplifiers, see the AN-940 Application Note, Low Noise

Amplifier Selection Guide for Optimal Noise Performance,

available at www.analog.com.

Table 1. Low Noise Op Amps

Voltage Noise Single Dual Quad

1.1 nV/Hz AD8597 AD8599

1.8 nV/Hz ADA4004-1 ADA4004-2 ADA4004-4

2.8 nV/Hz RRO

AD8675 AD8676

2.8 nV/Hz AD8671 AD8672 AD8674

3.2 nV/Hz

OP27/OP37

3.9 nV/Hz RRIO

ADA4084-2

Rail-to-rail output.

Rail-to-rail input/output.

Summary of content (29 pages)

PAGE 1
FEATURES PIN CONFIGURATION Rail-to-rail input/output Low power: 625 µA typical Gain bandwidth product: 15.9 MHz at AV =100 typical Unity-gain crossover: 9.9 MHz typical −3 dB closed-loop bandwidth: 13.9 MHz typical at ±15 V Low offset voltage: 100 μV maximum (SOIC) Unity-gain stable High slew rate: 4.6 V/μs typical Low noise: 3.9 nV/√Hz typical at 1 kHz ADA4084-2 OUT A 1 8 V+ –IN A 2 7 OUT B +IN A 3 6 –IN B V– 4 5 +IN B TOP VIEW (Not to Scale) NOTES 1.
PAGE 2
Powered by TCPDF (www.tcpdf.org) IMPORTANT LINKS for the ADA4084-2* Last content update 09/27/2013 10:13 am PARAMETRIC SELECTION TABLES ADA4077-2: available as a dual channel version in two grades offering lower offset and drift with higher linearity within the Input Voltage Range for dual supply applications. ADA4500-2: offers similar speed and precision in a high linearity, zero-crossover, 5V Op Amp.
PAGE 3
ADA4084-2 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 ±15 V Characteristics ................................................................ 17 Applications ....................................................................................... 1 Applications Information .............................................................. 22 General Description .........................................................
PAGE 4
Data Sheet ADA4084-2 SPECIFICATIONS ELECTRICAL CHARACTERISTICS VSY = 3 V, VCM =1.5 V, TA = 25°C, unless otherwise noted. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Offset Voltage Matching Input Bias Current Symbol Test Conditions/Comments VOS SOIC package −40°C ≤ TA ≤ +125°C MSOP package −40°C ≤ TA ≤ +125°C LFCSP package −40°C ≤ TA ≤ +125°C −40°C ≤ TA ≤ +125°C Channel A vs. Channel B, TA = 25°C ΔVOS/ΔT Min IB Typ Max Unit 0.5 100 200 130 250 200 300 1.
PAGE 5
ADA4084-2 Data Sheet VSY = ±5.0 V, VCM = 0 V, TA = 25°C, unless otherwise noted. Table 3. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Offset Voltage Matching Input Bias Current Symbol Conditions VOS SOIC package −40°C ≤ TA ≤ +125°C MSOP package −40°C ≤ TA ≤ +125°C LFCSP package −40°C ≤ TA ≤ +125°C −40°C ≤ TA ≤ +125°C Channel A vs. Channel B, TA = 25°C ΔVOS/ΔT Min IB Typ Max Unit 0.5 100 250 130 250 200 300 1.
PAGE 6
Data Sheet ADA4084-2 VSY = ±15.0 V, VCM = 0 V, TA = 25°C, unless otherwise noted. Table 4. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Offset Voltage Matching Input Bias Current Symbol Conditions VOS SOIC package −40°C ≤ TA ≤ +125°C MSOP package −40°C ≤ TA ≤ +125°C LFCSP package −40°C ≤ TA ≤ +125°C Min ΔVOS/ΔT Typ Max Unit 0.5 100 200 130 250 200 300 1.75 150 300 450 25 50 +15 μV μV μV μV μV μV μV/°C μV nA nA nA nA V dB dB dB dB kΩ||pF MΩ||pF Channel A vs.
PAGE 7
ADA4084-2 Data Sheet ABSOLUTE MAXIMUM RATINGS Table 5. Parameter Supply Voltage Input Voltage Differential Input Voltage1 Output Short-Circuit Duration to GND Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature (Soldering 60 sec) θJA is specified for the device soldered on a 4-layer JEDEC standard printed circuit board (PCB) with zero airflow. Table 6.
PAGE 8
Data Sheet ADA4084-2 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. ±1.5 V CHARACTERISTICS 60 120 ADA4084-2 VSY = ±1.5V TA = 25°C RL = ∞ 50 80 60 40 20 40 30 20 ADA4084-2 VSY = ±1.5V TA = 25°C RL = ∞ –40° ≤ TA ≤ +125°C 10 –75 –50 –25 0 25 75 50 100 VOS (µV) 0 08237-003 0 –100 0 0.4 0.6 0.8 1.0 1.2 30 ADA4084-2 VSY = ±1.5V TA = 25°C RL = ∞ 2.0 1.8 ADA4084-2 VSY = ±1.5V TA = 25°C RL = ∞ –40° ≤ TA ≤ +125°C 25 NUMBER OF AMPLIFIERS 40 1.6 Figure 6.
PAGE 9
ADA4084-2 Data Sheet –50 1000 IB+ 100 IB– 10 VOL – (V–) –200 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 1 0.001 0.01 0.1 1 Figure 12. Dropout Voltage vs. Sink Current Figure 9. Input Bias Current vs. Temperature 120 600 270 ADA4084-2 VSY = ±1.5V TA = 25°C RL = 10kΩ 100 400 80 225 180 200 GAIN (dB) INPUT BIAS (nA) 10 LOAD CURRENT (mA) TA = +125°C 0 TA = +85°C 60 135 40 90 20 45 0 0 –200 TA = +25°C –400 TA = –40°C –1.0 –0.5 0 0.5 1.0 1.
PAGE 10
Data Sheet ADA4084-2 1000 1.5 AV = +10 100 1.0 AV = +100 VOLTAGE (V) ZOUT (Ω) 0.5 10 AV = +1 1 0 –0.5 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) –1.5 08237-013 0 2 10 12 14 16 18 16 18 80 ADA4084-2 VSY = ±1.5V TA = 25°C 120 60 100 40 VOLTAGE (mV) 60 PSRR– 40 20 20 0 –20 ADA4084-2 VSY = ±1.5V TA = 25°C RL = 2kΩ CL = 100pF –40 PSRR+ –60 0 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) –80 08237-014 100 2 0 4 6 12 10 8 14 TIME (µs) Figure 19.
PAGE 11
ADA4084-2 Data Sheet 0 ADA4084-2 VSY = ±1.5V TA = 25°C VIN = 1V p-p CHANNEL SEPARATION (dB) –20 4 ADA4084-2 VSY = ±1.5V TA = 25°C 10 100 1k 10k –60 –80 –100 –120 100k FREQUENCY (Hz) –160 100 1k Figure 21. Voltage Noise Density 100k Figure 24. Channel Separation 60 1 ADA4084-2 VSY = ±1.5V VIN = 100mV p-p RL = 2kΩ TA = 25°C 50 OS+ 40 0.1 THD + N (%) 30 20 0.01 OS– ADA4084-2 VSY = ±1.5V TA = 25°C f = 1kHz 10 1 10 100 0.001 0.001 08237-020 0 1000 CAPACITANCE (pF) 0.01 0.
PAGE 12
Data Sheet ADA4084-2 2.0 ADA4084-2 VSY = ±1.5V TA = 25°C 1.5 0.5 OUTPUT 0 –0.5 INPUT –1.0 –1.5 –2.0 0 100 200 300 400 500 600 700 TIME (µs) 800 900 1000 08237-025 VOLTAGE (V) 1.0 Figure 27. No Phase Reversal Rev.
PAGE 13
ADA4084-2 Data Sheet ±5 V CHARACTERISTICS 50 120 ADA4084-2 VSY = ±5V TA = 25°C RL = ∞ 45 40 80 60 40 35 30 25 20 15 ADA4084-2 VSY = ±5V RL = ∞ –40° ≤ TA ≤ +125°C 10 20 5 –75 –50 –25 0 25 50 75 100 VOS (µV) 08237-026 0 –100 0 0 0.8 1.0 1.2 35 ADA4084-2 VSY = ±5V TA = 25°C RL = ∞ 1.4 1.6 1.8 2.0 ADA4084-2 VSY = ±5V RL = ∞ –40° ≤ TA ≤ +125°C 30 NUMBER OF AMPLIFIERS 50 40 30 20 10 25 20 15 10 –25 0 25 50 75 100 VOS (µV) 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.
PAGE 14
Data Sheet ADA4084-2 –50 1000 100 VDO (mV) IB+ –150 IB– ADA4084-2 VSY = ±5V VCM = 0V RL = ∞ 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 1 0.001 0.01 0.1 1 08237-033 –10 10 LOAD CURRENT (mA) Figure 34. Input Bias Current vs. Temperature Figure 37. Dropout Voltage vs.
PAGE 15
ADA4084-2 Data Sheet 1000 5 4 100 3 AV = +10 VOLTAGE (V) AV = +100 1 1 0 –1 –2 0.10 ADA4084-2 VSY = ±5V TA = 25°C 100 1k 10k 100k 1M 10M –4 100M FREQUENCY (Hz) –5 08237-036 0.01 10 ADA4084-2 VSY = ±5V TA = 25°C RL = 2kΩ CL = 100pF –3 0 2 8 10 12 14 16 18 9 10 Figure 43. Large Signal Transient Response 140 80 ADA4084-2 VSY = ±5V TA = 25°C 120 60 40 VOLTAGE (mV) 100 PSRR (dB) 6 TIME (µs) Figure 40. Output Impedance vs.
PAGE 16
Data Sheet ADA4084-2 0 ADA4084-2 VSY = ±5V TA = 25°C VIN = 5V p-p CHANNEL SEPARATION (dB) –20 4 ADA4084-2 VSY = ±5V TA = 25°C 10 100 1k 10k –60 –80 –100 –120 100k FREQUENCY (Hz) –160 100 1k Figure 46. Voltage Noise Density 1 ADA4084-2 VSY = ±5V VIN = 100mV p-p RL = 2kΩ TA = 25°C 50 OS+ 0.1 40 THD + N (%) 30 20 0.01 OS– 1 10 100 0.0001 0.001 08237-043 0 1000 CAPACITANCE (pF) ADA4084-2 VSY = ±5V TA = 25°C f = 1kHz 0.1 0.01 08237-046 0.001 10 1 AMPLITUDE (VRMS) Figure 47.
PAGE 17
ADA4084-2 Data Sheet 6 ADA4084-2 VSY = ±5V TA = 25°C 4 0 OUTPUT –2 INPUT –4 –6 0 100 200 300 400 500 600 700 TIME (µs) 800 900 1000 08237-048 VOLTAGE (V) 2 Figure 52. No Phase Reversal Rev.
PAGE 18
Data Sheet ADA4084-2 ±15 V CHARACTERISTICS 60 100 ADA4084-2 VSY = ±15V TA = 25°C RL = ∞ 50 60 50 40 30 20 40 30 20 ADA4084-2 VSY = ±15V RL = ∞ –40° ≤ TA ≤ +125°C 10 10 –75 –50 –25 0 25 50 75 100 VOS (µV) 0 08237-049 0 –100 0 0.8 1.0 1.2 1.4 30 ADA4084-2 VSY = ±15V TA = 25°C RL = ∞ 1.6 1.8 2.0 ADA4084-2 VSY = ±15V RL = ∞ –40° ≤ TA ≤ +125°C 25 NUMBER OF AMPLIFIERS 50 40 30 20 20 15 10 5 10 –75 –50 –25 0 25 50 75 100 VOS (µV) 0 08237-050 0 –100 0 0.2 0.
PAGE 19
ADA4084-2 Data Sheet –50 10000 IB+ –100 VDO (mV) –250 –40 –25 –10 5 20 35 50 65 80 110 95 VOL – (V–) 10 ADA4084-2 VSY = ±15V VCM = 0V RL = ∞ 125 TEMPERATURE (°C) 1 0.001 0.01 ADA4084-2 VSY = ±15V TA = 25°C 0.1 1 Figure 59. Input Bias Current vs. Temperature Figure 62. Dropout Voltage vs.
PAGE 20
Data Sheet ADA4084-2 1000 15 10 100 AV = +10 VOLTAGE (V) ZOUT (Ω) 5 10 AV = +100 1 0 –5 AV = +1 –10 ADA4084-2 VSY = ±15V TA = 25°C 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) –15 08237-059 0 4 32 36 60 40 VOLTAGE (mV) 100 PSRR– 40 20 0 –20 ADA4084-2 VSY = ±15V TA = 25°C RL = 2kΩ CL = 100pF –40 PSRR+ –60 0 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) –80 08237-060 100 0 1 3 2 4 5 6 7 8 9 10 TIME (µs) Figure 69. Small Signal Transient Response Figure 66.
PAGE 21
ADA4084-2 Data Sheet 10 0 ADA4084-2 VSY = ±15V TA = 25°C VIN = 10V p-p CHANNEL SEPARATION (dB) 4 ADA4084-2 VSY = ±15V TA = 25°C 10 100 1k 10k –60 –80 –100 –120 –140 100k FREQUENCY (Hz) –180 100 10k 100k FREQUENCY (Hz) Figure 71. Voltage Noise Density Figure 74. Channel Sepatation 70 1 ADA4084-2 VSY = ±15V VIN = 100mV p-p RL = 2kΩ TA = 25°C 60 OS+ 0.1 THD + N (%) 50 40 30 20 OS– 0.01 0.001 ADA4084-2 VSY = ±15V TA = 25°C f = 1kHz 10 1 10 100 0.0001 0.
PAGE 22
Data Sheet ADA4084-2 20 ADA4084-2 VSY = ±15V TA = 25°C 15 5 0 OUTPUT –5 INPUT –10 –15 –20 0 100 200 300 400 500 600 700 TIME (µs) 800 900 1000 08237-071 VOLTAGE (V) 10 Figure 77. No Phase Reversal Rev.
PAGE 23
ADA4084-2 Data Sheet APPLICATIONS INFORMATION FUNCTIONAL DESCRIPTION The ADA4084-2 is a precision single-supply, rail-to-rail operational amplifier. Intended for portable instrumentation, the ADA4084-2 combines the attributes of precision, wide bandwidth, and low noise to make it an ideal choice in single-supply applications that require both ac and precision dc performance.
PAGE 24
Data Sheet ADA4084-2 The ADA4084-2 is specified to operate from 3 V to 30 V (±1.5 V to ±15 V) under nominal power supplies. During power up as the supply voltage increases from 0 V to the nominal power supply voltage, the supply current (ISY) increases as well to the point at which it stabilizes and the amplifier is ready to operate.
PAGE 25
ADA4084-2 Data Sheet DESIGNING LOW NOISE CIRCUITS IN SINGLESUPPLY APPLICATIONS In single-supply applications, devices like the ADA4084-2 extend the dynamic range of the application through the use of rail-to-rail operation.
PAGE 26
Data Sheet ADA4084-2 OUTLINE DIMENSIONS 3.20 3.00 2.80 5.15 4.90 4.65 5 8 3.20 3.00 2.80 1 4 PIN 1 IDENTIFIER 0.65 BSC 0.95 0.85 0.75 15° MAX 1.10 MAX 0.80 0.55 0.40 0.23 0.09 6° 0° 0.40 0.25 10-07-2009-B 0.15 0.05 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 85. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 5.00 (0.1968) 4.80 (0.1890) 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.
PAGE 27
ADA4084-2 Data Sheet 3.10 3.00 SQ 2.90 0.50 BSC 8 5 1.70 1.60 SQ 1.50 EXPOSED PAD 0.50 0.40 0.30 0.80 0.75 0.70 SEATING PLANE 0.30 0.25 0.20 1 4 BOTTOM VIEW TOP VIEW 0.05 MAX 0.02 NOM COPLANARITY 0.08 0.203 REF 0.20 MIN PIN 1 INDICATOR (R 0.15) FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION SECTION OF THIS DATA SHEET. COMPLIANT TO JEDEC STANDARDS MO-229-WEED 02-05-2013-B PIN 1 INDEX AREA Figure 87.
PAGE 28
Data Sheet ADA4084-2 NOTES Rev.