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55 V, EMI Enhanced, Zero Drift, Ultralow Noise,

Rail-to-Rail Output Operational Amplifiers

Data Sheet

ADA4522-1/ADA4522-2/ADA4522-4

Rev. F Document Feedback

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FEATURES

Low offset voltage: 5 μV maximum

Extremely low offset voltage drift: 22 nV/°C maximum

Low voltage noise density: 5.8 nV/√Hz typical

117 nV p-p typical from 0.1 Hz to 10 Hz

Low input bias current: 50 pA typical

Unity-gain crossover: 3 MHz typical

Single-supply operation: input voltage range includes

ground and rail-to-rail output

Wide range of operating voltages

Single-supply operation: 4.5 V to 55 V

Dual-supply operation: ±2.25 V to ±27.5 V

Integrated EMI filters

Unity-gain stable

APPLICATIONS

Inductance, capacitance, and resistance (LCR) meter/

megohmmeter front-end amplifiers

Load cell and bridge transducers

Magnetic force balance scales

High precision shunt current sensing

Thermocouple/resistance temperature detector (RTD) sensors

Programmable logic controller (PLC) input and output

amplifiers

GENERAL DESCRIPTION

The ADA4522-1/ADA4522-2/ADA4522-4 are single/dual/quad

channel, zero drift op amps with low noise and power, ground

sensing inputs, and rail-to-rail output, optimized for total

accuracy over time, temperature, and voltage conditions. The

wide operating voltage and temperature ranges, as well as the

high open-loop gain and very low dc and ac errors make the

devices well suited for amplifying very small input signals and

for accurately reproducing larger signals in a wide variety of

applications.

The ADA4522-1/ADA4522-2/ADA4522-4 performance is

specified at 5.0 V, 30 V, and 55 V power supply voltages. These

devices operate over the range of 4.5 V to 55 V, and are excellent

for applications using single-ended supplies of 5 V, 10 V, 12 V,

and 30 V, or for applications using higher single supplies and

du a l s u ppl i es o f ± 2 .5 V, ± 5 V, a n d ± 1 5 V. Th e ADA4522-1/

ADA4522-2/ADA4522-4 use on-chip filtering to achieve high

immunity to electromagnetic interference (EMI).

The ADA4522-1/ADA4522-2/ADA4522-4 are fully specified

over the extended industrial temperature range of −40°C to

+125°C and are available in 8-lead MSOP, 8-lead SOIC, 14-lead

SOIC, and 14-lead TSSOP packages.

PIN CONNECTION DIAGRAM

OUT A

–IN A

+IN A

V–

V+

OUT B

–IN B

+IN B

ADA4522-2

TOP VIEW

(Not to Scale)

13168-001

Figure 1. 8-Lead MSOP (RM Suffix) and 8-Lead SOIC (R Suffix)

Pin Configuration

For the ADA4522-1 and ADA4522-4 pin connections and for

more information about the pin connections for these products,

see the Pin Configurations and Function Descriptions section.

100

0.1

10 100k 1M10k1k100

VOLTAGE NOISE DENSITY (nV/Hz)

FREQUENCY (Hz)

= 100

30V

55V

13168-165

Figure 2. Voltage Noise Density vs. Frequency, V

= ±15 V

Table 1. Zero Drift Op Amps (<0.1 μV/°C)

Supply Voltage 5 V 16 V 30 V 55 V

Single ADA4528-1 AD8638 ADA4638-1 ADA4522-1

AD8628

AD8538

ADA4051-1

Dual ADA4528-2 AD8639 ADA4522-2

AD8629

AD8539

ADA4051-2

Quad AD8630 ADA4522-4

Downloaded from Arrow.com.

Summary of content (33 pages)

PAGE 1
55 V, EMI Enhanced, Zero Drift, Ultralow Noise, Rail-to-Rail Output Operational Amplifiers ADA4522-1/ADA4522-2/ADA4522-4 Data Sheet OUT A 1 8 V+ –IN A 2 ADA4522-2 7 OUT B +IN A 3 TOP VIEW (Not to Scale) 6 –IN B 5 +IN B V– 4 Figure 1. 8-Lead MSOP (RM Suffix) and 8-Lead SOIC (R Suffix) Pin Configuration For the ADA4522-1 and ADA4522-4 pin connections and for more information about the pin connections for these products, see the Pin Configurations and Function Descriptions section.
PAGE 2
ADA4522-1/ADA4522-2/ADA4522-4 Data Sheet TABLE OF CONTENTS Features .......................................................................................... 1 Input Protection ......................................................................... 22 Applications ....................................................................................... 1 Single-Supply and Rail-to-Rail Output ................................... 23 General Description ...................................................
PAGE 3
Data Sheet ADA4522-1/ADA4522-2/ADA4522-4 SPECIFICATIONS ELECTRICAL CHARACTERISTICS—5.0 V OPERATION VSY = 5.0 V, VCM = VSY/2 V, TA = 25°C, unless otherwise specified. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Symbol Test Conditions/Comments VOS VCM = VSY/2 −40°C ≤ TA ≤ +125°C Min TCVOS IB Typ Max Unit 0.7 5 6.5 15 150 500 2 250 350 500 3.5 μV μV nV/°C pA pA nA pA pA pA V dB dB dB dB dB 2.
PAGE 4
ADA4522-1/ADA4522-2/ADA4522-4 Parameter Gain Bandwidth Product Unity-Gain Crossover −3 dB Closed-Loop Bandwidth Phase Margin Settling Time to 0.
PAGE 5
Data Sheet Parameter Short-Circuit Current Source ADA4522-1/ADA4522-2/ADA4522-4 Symbol ISC+ Test Conditions/Comments Min Typ 21 15 33 22 4 150 145 160 TA = 125°C Short-Circuit Current Sink Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current per Amplifier DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Unity-Gain Crossover −3 dB Closed-Loop Bandwidth Phase Margin Settling Time to 0.1% Settling Time to 0.
PAGE 6
ADA4522-1/ADA4522-2/ADA4522-4 Parameter Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Input Resistance Differential Mode Common Mode Input Capacitance Differential Mode Common Mode OUTPUT CHARACTERISTICS Output Voltage High Low Symbol IVR CMRR AV Data Sheet Test Conditions/Comments VCM = 0 V to 53.5 V −40°C ≤ TA ≤ +125°C RL = 10 kΩ, VOUT = 0.5 V to 54.5 V −40°C ≤ TA ≤ +125°C Min 0 140 135 135 125 CINDM CINCM 7 35 pF pF 54.
PAGE 7
Data Sheet ADA4522-1/ADA4522-2/ADA4522-4 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 5.
PAGE 8
ADA4522-1/ADA4522-2/ADA4522-4 Data Sheet NIC 1 8 NIC –IN 2 ADA4522-1 7 V+ +IN 3 TOP VIEW (Not to Scale) 6 OUT 5 NIC V– 4 NOTES 1. NIC = NOT INTERNALLY CONNECTED. 13168-101 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Figure 3. ADA4522-1 Pin Configuration Table 7.
PAGE 9
ADA4522-1/ADA4522-2/ADA4522-4 OUT A 1 14 OUT D 2 13 –IN D +IN A 3 ADA4522-4 12 +IN D TOP VIEW (Not to Scale) 11 V– 10 +IN C –IN A V+ 4 +IN B 5 –IN B 6 9 –IN C OUT B 7 8 OUT C 13168-189 Data Sheet Figure 5. ADA4522-4 Pin Configuration Table 9. ADA4522-4 Pin Function Descriptions Pin No.
PAGE 10
ADA4522-1/ADA4522-2/ADA4522-4 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. 60 50 40 30 20 –3 –2 –1 0 1 2 3 4 5 VOS (µV) NUMBER OF AMPLIFIERS NUMBER OF AMPLIFIERS 30 30 20 0 5 10 15 20 25 30 VSY = ±15V –40°C ≤ TA ≤ +125°C 160 CHANNELS MEAN = –2.48nV/°C STD DEV. = 2.65nV/°C 25 20 15 10 5 10 –4 –3 –2 –1 0 1 2 3 4 5 VOS (µV) 0 –30 –25 –20 –15 –10 13168-004 0 –5 –5 0 5 10 15 20 25 30 TCVOS (nV/°C) Figure 7.
PAGE 11
2000 VSY = 5V 20 CHANNELS 1500 1 1000 VSY = 5V +125°C +85°C +25°C –40°C IB (pA) 3 –1 500 –3 0 –5 0 1.0 2.0 3.0 3.5 VCM (V) Figure 12. Input Offset Voltage (VOS) vs. Common-Mode Voltage (VCM), VSY = 5 V 5 –500 13168-009 VOS (µV) 5 ADA4522-1/ADA4522-2/ADA4522-4 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 VCM (V) 13168-012 Data Sheet Figure 15. Input Bias Current (IB) vs.
PAGE 12
ADA4522-1/ADA4522-2/ADA4522-4 2000 IB (pA) 2500 800 IB (pA) 1000 600 1500 400 1000 200 500 0 0 –200 –500 –25 0 25 50 75 100 125 TEMPERATURE (°C) –1000 –50 13168-015 –400 –50 IB+ IB– IOS ISY PER AMPLIFIER (mA) IB (pA) 50 75 100 500 0.6 0.4 0.2 0 –25 0 25 50 75 100 125 TEMPERATURE (°C) 0 13168-017 –500 –50 100k 5 10 15 20 25 30 35 40 45 50 55 60 +125°C +85°C +25°C –40°C VSY = ±2.5V TO ±27.
PAGE 13
150 VSY = ±2.5V OUTPUT VOLTAGE LOW (VOL) TO SUPPLY RAIL (mV) 125 RL = 2kΩ 100 75 50 RL = 10kΩ 25 0 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) 50 200 RL = 10kΩ –25 0 25 50 75 100 125 150 VSY = ±15V 150 RL = 10kΩ 125 100 75 50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) Figure 25. Output Voltage High (VOH) to Supply Rail vs. Temperature, VSY = ±15 V 75 50 RL = 100kΩ –25 0 25 50 75 100 125 150 TEMPERATURE (°C) Figure 28.
PAGE 14
ADA4522-1/ADA4522-2/ADA4522-4 140 Data Sheet 140 VSY = ±2.5V TO ±27.5V 100 100 80 80 PSRR (dB) 120 CMRR (dB) 120 60 PSRR+ PSRR– VSY = ±2.5V TO ±27.5V 60 40 40 20 20 1k 10k 100k 1M 10M FREQUENCY (Hz) –20 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) Figure 30. CMRR vs. Frequency 1k AV = 100 AV = 10 AV = 1 Figure 33. PSRR vs. Frequency 0.840 VSY = ±2.5V TO ±27.5V 10 1 0.1 0.01 0.830 0.825 0.820 0.815 10k 100k 1M 10M 100M FREQUENCY (Hz) 0.
PAGE 15
ADA4522-1/ADA4522-2/ADA4522-4 1.5 1.0 0.04 VOLTAGE (V) 0.5 0 –0.5 0 –0.02 –0.04 –1.5 –0.06 TIME (4µs/DIV) –0.08 TIME (400ns/DIV) Figure 36. Large Signal Transient Response, VSY = ±2.5 V 20 Figure 39. Small Signal Transient Response, VSY = ±2.5 V 0.08 VSY = ±15V VIN = 15V p-p AV = 1 RL = 10kΩ CL = 100pF RS_IN+ = 100Ω RS_IN– = 100Ω 15 10 0.04 VOLTAGE (V) 5 0 –5 0.02 0 –0.02 –10 –0.04 –15 –0.06 –20 TIME (10µs/DIV) –0.08 TIME (400ns/DIV) Figure 37.
PAGE 16
ADA4522-1/ADA4522-2/ADA4522-4 45 40 0 VSY = ±2.5V RL = 10kΩ AV = 1 VIN = 100mV p-p –20 CHANNEL SEPARATION (dB) 50 Data Sheet OVERSHOOT (%) 35 OS+ 30 25 OS– 20 15 10 VIN = 0.5V p-p VIN = 1V p-p VIN = 2V p-p VSY = ±2.5V AV = –10 RL = 10kΩ –40 –60 –80 –100 –120 100 1000 LOAD CAPACITANCE (pF) –140 0.
PAGE 17
Data Sheet ADA4522-1/ADA4522-2/ADA4522-4 100 1 80kHz LOW-PASS FILTER 500kHz LOW-PASS FILTER 80kHz LOW-PASS FILTER 500kHz LOW-PASS FILTER 10 0.1 THD + N (%) THD + N (%) 1 0.1 0.01 0.01 0.001 0.0001 0.001 0.01 0.1 1 AMPLITUDE (V rms) 0.0001 10 100 1k 10k 100k FREQUENCY (Hz) Figure 48. THD + N vs. Amplitude, VSY = ±2.5 V 100 VSY = ±2.5V AV = 1 RL = 10kΩ VIN = 0.6V rms 13168-053 VSY = ±2.5V AV = 1 FREQUENCY = 1kHz RL = 10kΩ 13168-050 0.001 Figure 51. THD + N vs. Frequency, VSY = ±2.
PAGE 18
ADA4522-1/ADA4522-2/ADA4522-4 0.2 VSY = ±2.5V VIN = 350mV p-p RL = 10kΩ CL = 100pF AV = –10 –0.6 –0.8 –1.0 VOUT –1.2 4 3 2 1 0 0 –1.4 –1 TIME (1µs/DIV) VSY = ±2.5V VIN = 350mV p-p RL = 10kΩ CL = 100pF AV = –10 –0.2 –0.4 –0.6 2 1 0 VOUT –0.8 –1 –1.0 –2 –1.2 –3 TIME (1µs/DIV) Figure 54. Positive Overload Recovery, VSY = ±2.5 V 2 3 OUTPUT VOLTAGE (V) 5 –0.4 4 VIN 13168-056 INPUT VOLTAGE (V) –0.2 6 5 13168-059 VIN 0.4 INPUT VOLTAGE (V) 0 7 OUTPUT VOLTAGE (V) 0.
PAGE 19
Data Sheet 100 10 1 10 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) 10 1 0.1 10 1k 10k 100k 1M Figure 63. Voltage Noise Density vs. Frequency, AV = 100 100 VSY = ±15V AV = 1 VSY = ±15V AND ±27.5V AV = 100 PEAK-TO-PEAK NOISE = 117nV p-p 75 INPUT REFERRED VOLTAGE (nV) VOLTAGE NOISE DENSITY (nV/√Hz) 100 FREQUENCY (Hz) Figure 60. Voltage Noise Density vs. Frequency, VSY = ±2.5 V 100 5V 30V 55V AV = 100 13168-065 VOLTAGE NOISE DENSITY (nV/√Hz) VSY = ±2.
PAGE 20
Data Sheet INPUT VOLTAGE (1V/DIV) INPUT VOLTAGE (1V/DIV) ADA4522-1/ADA4522-2/ADA4522-4 VSY = ±2.5V RL = 10kΩ CL = 50pF DUT AV = –1 +1V 0 INPUT –1V INPUT +1V 0 –1V VSY = ±2.5V RL = 10kΩ CL = 50pF DUT AV = –1 OUTPUT +10mV 0 –10mV +10mV 0 –10mV ERROR BAND POST GAIN = 10 13168-046 ERROR BAND POST GAIN = 10 TIME (2µs/DIV) TIME (2µs/DIV) Figure 69. Positive Settling Time to 0.1%, VSY = ±2.5 V INPUT VOLTAGE (5V/DIV) VSY = ±15V AND ±27.
PAGE 21
Data Sheet ADA4522-1/ADA4522-2/ADA4522-4 THEORY OF OPERATION The ADA4522-1/ADA4522-2/ADA4522-4 are single, dual, and quad, ultralow noise, high voltage, zero drift, rail-to-rail output operational amplifiers. They feature a chopping technique that offers an ultralow input offset voltage of 5 μV and an input offset voltage drift of 22 nV/°C maximum for the ADA4522-1 and ADA4522-2 and 25 nV/°C maximum for the ADA4522-4.
PAGE 22
ADA4522-1/ADA4522-2/ADA4522-4 Data Sheet ON-CHIP INPUT EMI FILTER AND CLAMP CIRCUIT Figure 72 shows the input EMI filter and clamp circuit. The ADA4522-1/ADA4522-2/ADA4522-4 have internal ESD protection diodes (D1, D2, D3, and D4) that are connected between the inputs and each supply rail. These diodes protect the input transistors in the event of electrostatic discharge and are reverse biased during normal operation.
PAGE 23
Data Sheet ADA4522-1/ADA4522-2/ADA4522-4 The ADA4522-1/ADA4522-2/ADA4522-4 are single-supply amplifiers, where their input voltage range includes the lower supply rail. This feature is ideal for applications where the input common-mode voltage is at the lower supply rail, for example, ground sensing. Conversely, the amplifier output is rail to rail. Figure 73 shows the input and output waveforms of the ADA4522-1/ADA4522-2/ADA4522-4 configured as a unitygain buffer with a supply voltage of ±15 V.
PAGE 24
ADA4522-1/ADA4522-2/ADA4522-4 Data Sheet NOISE CONSIDERATIONS Residual Ripple 1/f Noise As shown in Figure 60, Figure 61, and Figure 62, the ADA4522-1/ ADA4522-2/ADA4522-4 have a flat noise spectrum density at lower frequencies and exhibits spectrum density bumps and peaks at higher frequencies. The ADA4522-1/ADA4522-2/ADA4522-4 are some of the lowest noise high voltage zero drift amplifiers with 5.8 nV/√Hz of voltage noise density at 1 kHz (AV = 100).
PAGE 25
Data Sheet ADA4522-1/ADA4522-2/ADA4522-4 Figure 77 shows the voltage noise density of the ADA4522-1/ ADA4522-2/ADA4522-4 without and with post filters at different frequencies. The post filter serves to roll off the bandwidth before the switching frequency. In this example, the noise peak at 800 kHz is about 38 nV/√Hz. With a post filter at 80 kHz, the noise peak is reduced to 4.1 nV/√Hz. With a post filter at 8 kHz, the noise peak is lower than the noise floor and cannot be detected.
PAGE 26
ADA4522-1/ADA4522-2/ADA4522-4 Data Sheet +VSY –VSY 45 35 30 25 20 10 CL 5 0 10 100 LOAD CAPACITANCE (pF) Figure 80. Stability Compensation with Isolating Resistor, RISO Figure 81 shows the effect on overshoot with different values of RISO. 1k Figure 81. Small Signal Overshoot vs. Load Capacitance with Various Output Isolating Resistors Rev. F | Page 26 of 33 Downloaded from Arrow.com.
PAGE 27
Data Sheet ADA4522-1/ADA4522-2/ADA4522-4 APPLICATIONS INFORMATION SINGLE-SUPPLY INSTRUMENTATION AMPLIFIER The extremely low offset voltage and drift, high open-loop gain, high common-mode rejection, and high power supply rejection of the ADA4522-1/ADA4522-2/ADA4522-4 make them excellent op amp choices as discrete, single-supply instrumentation amplifiers. Figure 82 shows the classic 3-op-amp instrumentation amplifier using the ADA4522-1/ADA4522-2/ADA4522-4.
PAGE 28
ADA4522-1/ADA4522-2/ADA4522-4 Data Sheet +5V V+ 1/2 1µF R1 11.3kΩ RG 60.4Ω VEXC OUT– SENSE+ C1 3.3µF R4 1kΩ C2 3.3µF OUT+ SENSE– R3 1kΩ VDD REF(+) REF(–) 100pF C3 1µF DIN DOUT/ RDY AD7791 AIN(+) SCLK C5 10µF CS AIN(–) C4 1µF GND R2 11.3kΩ 1/2 13168-079 LOAD CELL 100pF ADA4522-2 ADA4522-2 Figure 83. Precision Weigh Scale Measurement System PRECISION LOW-SIDE CURRENT SHUNT SENSOR A typical shunt may be 100 mΩ.
PAGE 29
Data Sheet ADA4522-1/ADA4522-2/ADA4522-4 to the lower supply rail, resulting in an increase in the total supply current of the system. Both comparator configurations yield the same result. At 30 V of power supply, ISY+ remains at 1.55 mA per dual amplifier, but ISY− increases close to 2 mA in magnitude per dual amplifier. performance of the ultralow offset voltage of the ADA4522-1/ ADA4522-2/ADA4522-4.
PAGE 30
ADA4522-1/ADA4522-2/ADA4522-4 Data Sheet USE OF LARGE SOURCE RESISTANCE Workaround The ADA4522-1/ADA4522-2/ADA4522-4 are designed to work with low value source resistance. Note that the amplifier has an ultralow voltage noise density of 6 nV/√Hz. A 1 kΩ resistor contributes 4 nV/√Hz; therefore, placing a 1 kΩ resistor at the input increases total noise to 7.2 nV/√Hz. For this noise reason, it is recommended to avoid using large source resistance.
PAGE 31
Data Sheet ADA4522-1/ADA4522-2/ADA4522-4 OUTLINE DIMENSIONS 3.20 3.00 2.80 3.20 3.00 2.80 8 5.15 4.90 4.65 5 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 90. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 5.00 (0.1968) 4.80 (0.1890) 8 1 5 6.20 (0.2441) 5.80 (0.2284) 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.
PAGE 32
ADA4522-1/ADA4522-2/ADA4522-4 Data Sheet 8.75 (0.3445) 8.55 (0.3366) 4.00 (0.1575) 3.80 (0.1496) 8 14 1 7 6.20 (0.2441) 5.80 (0.2283) 1.27 (0.0500) BSC COPLANARITY 0.10 0.50 (0.0197) 0.25 (0.0098) 1.75 (0.0689) 1.35 (0.0531) 0.25 (0.0098) 0.10 (0.0039) SEATING PLANE 0.51 (0.0201) 0.31 (0.0122) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.
PAGE 33
Data Sheet ADA4522-1/ADA4522-2/ADA4522-4 ORDERING GUIDE Model1 ADA4522-1ARMZ ADA4522-1ARMZ-R7 ADA4522-1ARMZ-RL ADA4522-1ARZ ADA4522-1ARZ-R7 ADA4522-1ARZ-RL ADA4522-2ARMZ ADA4522-2ARMZ-R7 ADA4522-2ARMZ-RL ADA4522-2ARZ ADA4522-2ARZ-R7 ADA4522-2ARZ-RL ADA4522-4ARUZ ADA4522-4ARUZ-R7 ADA4522-4ARUZ-RL ADA4522-4ARZ ADA4522-4ARZ-R7 ADA4522-4ARZ-RL 1 Temperature Range −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40