AD8551 Analog Devices, AD8551 Datasheet
AD8551
Specifications of AD8551
Available stocks
Related parts for AD8551
AD8551 Summary of contents
Page 1
... Thermocouple amplifiers GENERAL DESCRIPTION This family of amplifiers has ultralow offset, drift, and bias current. The AD8551, AD8552, and AD8554 are single, dual, and quad amplifiers featuring rail-to-rail input and output swings. All are guaranteed to operate from 2 with a single supply. ...
Page 2
... AD8551/AD8552/AD8554 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Pin Configurations ........................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Electrical Characteristics ............................................................. 3 Absolute Maximum Ratings ............................................................ 5 Thermal Characteristics .............................................................. 5 ESD Caution .................................................................................. 5 Typical Performance Characteristics ............................................. 6 Functional Description .................................................................. 14 Amplifier Architecture .............................................................. 14 Basic Auto-Zero Amplifier Theory .......................................... 14 High Gain, CMRR, PSRR .......................................................... 16 Maximizing Performance Through Proper Layout ............... 16 REVISION HISTORY 9/08— ...
Page 3
... SY O −40°C ≤ T ≤ +125° kΩ L GBP kHz Rev Page AD8551/AD8552/AD8554 Min Typ Max Unit 1 5 μV 10 μ 1.0 1.5 nA 160 300 pA 2 ...
Page 4
... CM O Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current AD8551/AD8554 AD8552 AD8552 Input Offset Current AD8551/AD8554 AD8552 AD8552 Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain 1 Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Limit ...
Page 5
... MSOP (RM) ±5.0 V 8-Lead TSSOP (RU) 2000 V 8-Lead SOIC (R) Indefinite 14-Lead TSSOP (RU) −65°C to +150°C 14-Lead SOIC (R) −40°C to +125°C −65°C to +150°C ESD CAUTION 300°C Rev Page AD8551/AD8552/AD8554 θ θ Unit JA JC 190 44 °C/W 240 43 °C/W 158 43 ° ...
Page 6
... AD8551/AD8552/AD8554 TYPICAL PERFORMANCE CHARACTERISTICS 180 160 140 120 100 –2.5 –1.5 –0.5 0.5 OFFSET VOLTAGE (µV) Figure 7. Input Offset Voltage Distribution at 2 –40°C, +25°C, +85° –10 –20 – INPUT COMMON-MODE VOLTAGE (V) Figure 8. Input Bias Current vs. Common-Mode Voltage ...
Page 7
... Figure 17. Open-Loop Gain and Phase Shift vs. Frequency at 2 –10 –20 –30 –40 10k 100 125 150 Figure 18. Open-Loop Gain and Phase Shift vs. Frequency Rev Page AD8551/AD8552/AD8554 T = +25° SUPPLY VOLTAGE ( 2. 0pF L ∞ 100k ...
Page 8
... AD8551/AD8552/AD8554 –100 – –10 –20 –30 –40 100 1k 10k 100k FREQUENCY (Hz) Figure 19. Closed-Loop Gain vs. Frequency at 2 –100 – –10 –20 –30 –40 100 1k 10k 100k FREQUENCY (Hz) Figure 20. Closed-Loop Gain vs. Frequency ...
Page 9
... TO GND 0pF 10kΩ –100 V V OUT 20µs BOTTOM SCALE: 1V/DIV 10k TOP SCALE: 200mV/DIV Figure 30. Negative Overvoltage Recovery Rev Page AD8551/AD8552/AD8554 +OS –OS 100 1k 10k CAPACITANCE (pF ±2. –200mV p-p IN (RET TO GND 0pF 10kΩ ...
Page 10
... AD8551/AD8552/AD8554 200µs Figure 31. No Phase Reversal 140 V = 2.7V SY 120 100 100 1k 10k 100k FREQUENCY (Hz) Figure 32. CMRR vs. Frequency at 2.7 V 140 120 100 100 1k 10k 100k FREQUENCY (Hz) Figure 33. CMRR vs. Frequency 140 V = ±2. 2kΩ –100 ...
Page 11
... Figure 41. Voltage Noise Density at 2.7 V from kHz = ±2. Figure 42. Voltage Noise Density from 2.5 kHz Rev Page AD8551/AD8552/AD8554 0Ω S 0.5 1.0 1.5 2.0 2.5 FREQUENCY (kHz 2. 0Ω ...
Page 12
... AD8551/AD8552/AD8554 112 FREQUENCY (kHz) Figure 43. Voltage Noise Density from kHz 168 144 120 FREQUENCY (Hz) Figure 44. Voltage Noise Density from 150 0Ω S 145 140 135 ...
Page 13
... Figure 49. Output Voltage to Supply Rail vs. Temperature R = 100kΩ L 100 125 150 Rev Page AD8551/AD8552/AD8554 1kΩ 100kΩ 10kΩ L –50 – 100 TEMPERATURE (°C) ...
Page 14
... AD8551/AD8552/AD8554 FUNCTIONAL DESCRIPTION The AD855x family of amplifiers are high precision, rail-to-rail operational amplifiers that can be run from a single-supply voltage. Their typical offset voltage of less than 1 μV allows these amplifiers to be easily configured for high gains without risk of excessive output voltage errors. The extremely small temperature drift of 5 nV/° ...
Page 15
... The offset voltages of both the primary and nulling amplifiers are reduced by the Gain Factor B offset voltage from several millivolts down to an effective input OS offset voltage of submicrovolts. This autocorrection scheme is the outstanding feature of the AD855x series that continues to Rev Page AD8551/AD8552/AD8554 ( ) + − ...
Page 16
... ≠ THEN ≠ V TS1 SC1 Figure 54. Mismatch in Seebeck Voltages Causes Thermoelectric Voltage Error AD8551 AD8552/ AD8554 NOTES 1. R SHOULD BE PLACED IN CLOSE PROXIMITY AND S ALIGNMENT BALANCE SEEBECK VOLTAGES. 1 Figure 55. Using Dummy Components to Cancel ...
Page 17
... However, this reduces the bandwidth of the amplifier. Figure 59 and Figure 60 show configuration for reducing the clock feedthrough and the corresponding spectral analysis at the output. The −3 dB bandwidth of this configuration is 480 Hz. Rev Page AD8551/AD8552/AD8554 60dB ...
Page 18
... AD8551/AD8552/AD8554 3.3nF 100kΩ 100Ω 1mV rms IN @ 200Hz Figure 59. Reducing Autocorrection Clock Noise Using a Feedback Capacitor 0 –20 –40 –60 –80 –100 –120 FREQUENCY (kHz) Figure 60. Spectral Analysis Using a Feedback Capacitor BROADBAND AND EXTERNAL RESISTOR NOISE CONSIDERATIONS The total broadband noise output from any amplifier is primarily ...
Page 19
... Rev Page AD8551/AD8552/AD8554 (C ) includes stray capacitances and may differ 200 Ω Ω 0.47 μF 20 Ω 10 μF 5µs 1V Figure 63. AD855x Output Behavior on Power- 100kΩ OUT AD8551/ 100kΩ AD8552/ AD8554 Figure 64. AD855x Test Circuit for Turn-On Time ...
Page 20
... The value of this trimming resistor should be equal to the value of R multiplied by its tolerance. For example, using 10 kΩ resistors with 1% tolerance requires a series trimming resistor equal to 100 Ω. Rev Page AD8551 AD8552/ 4 AD8554 ...
Page 21
... Figure 68 shows a K-type thermocouple amplifier configuration with cold junction compensation. Even from supply, the AD8551 can provide enough accuracy to achieve a resolution of better than 0.02°C from 0°C to 500° used as a tempera- ture measuring device to correct the cold junction error from the thermocouple and should be placed as close as possible to the two terminating junctions ...
Page 22
... AD8551/AD8552/AD8554 OUTLINE DIMENSIONS 3.20 3.00 2.80 5. 3.20 4.90 3.00 4.65 2. PIN 1 0.65 BSC 0.95 0.85 1.10 MAX 0.75 0.15 0.38 0.23 0.00 0.22 0.08 COPLANARITY SEATING 0.10 PLANE COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 71. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 3.10 3.00 2. 4.50 6.40 BSC 4.40 4. PIN 1 0.65 BSC 0.15 1.20 0.05 MAX 0.30 COPLANARITY SEATING 0.20 0.19 PLANE 0.10 0.09 COMPLIANT TO JEDEC STANDARDS MO-153-AA Figure 72. 8-Lead Thin Shrink Small Outline Package [TSSOP] ...
Page 23
... AD8551ARZ-REEL −40°C to +125°C 1 AD8551ARZ-REEL7 −40°C to +125°C AD8551ARM-R2 −40°C to +125°C AD8551ARM-REEL −40°C to +125°C 1 AD8551ARMZ −40°C to +125°C 1 AD8551ARMZ-R2 −40°C to +125°C 1 AD8551ARMZ-REEL −40°C to +125°C AD8552AR −40°C to +125°C AD8552AR-REEL − ...
Page 24
... AD8551/AD8552/AD8554 NOTES ©1999–2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D01101-0-9/08(D) Rev Page ...