AD8638 Analog Devices, AD8638 Datasheet
AD8638
Specifications of AD8638
Available stocks
Related parts for AD8638
AD8638 Summary of contents
Page 1
... With a typical offset voltage of only 3 μV, drift of 0.01 μV/°C, and noise of 1.2 μV p-p (0 Hz), the AD8638/AD8639 are suited for applications in which error sources cannot be tolerated. Position and pressure sensors, medical equipment, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature ranges ...
Page 2
... AD8638/AD8639 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Pin Configurations ........................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Electrical Characteristics—5 V Operation................................ 3 Electrical Characteristics—16 V Operation ............................. 4 Absolute Maximum Ratings ............................................................ 5 Thermal Resistance ...................................................................... 5 ESD Caution .................................................................................. 5 Typical Performance Characteristics ............................................. 6 REVISION HISTORY 6/10—Rev Rev. F Changes to Features Section and General Description Section . 1 Updated Outline Dimensions ...
Page 3
... L L GBP kΩ pF Φ kΩ pF p-p 0 kHz n Rev Page AD8638/AD8639 Min Typ Max Unit 3 9 μV 23 μ μV 23 μV 1 105 ...
Page 4
... AD8638/AD8639 ELECTRICAL CHARACTERISTICS—16 V OPERATION / 25°C, unless otherwise noted Table 3. Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Offset Voltage Drift for All Packages ...
Page 5
... This was measured using a −65°C to +150°C standard two-layer board. 2 Exposed pad is soldered to t 300°C ESD CAUTION of T Rev Page AD8638/AD8639 1 θ θ Unit JA JC 230 146 °C/W 158 43 ° ...
Page 6
... AD8638/AD8639 TYPICAL PERFORMANCE CHARACTERISTICS T = 25°C, unless otherwise noted. A 1400 ≤ V ≤ +3V CM 1200 1000 800 600 400 200 0 –10 – (µV) OS Figure 5. Input Offset Voltage Distribution TCV (nV/°C) OS Figure 6. Input Offset Voltage Drift Distribution 10 ...
Page 7
... V – 100 0.001 250 200 150 100 100 125 Rev Page AD8638/AD8639 V = ± 100 TEMPERATURE (°C) Figure 14. Input Bias Current vs. Temperature V = ± – – 0.01 0 LOAD CURRENT (mA) Figure 15 ...
Page 8
... AD8638/AD8639 T = 25°C, unless otherwise noted. A 120 100 PHASE GAIN 20 0 –20 –40 –60 – ±2. 2kΩ –100 L –120 1k 10k 100k FREQUENCY (Hz) Figure 17. Open-Loop Gain and Phase vs. Frequency +100 + –20 –40 1k 10k 100k FREQUENCY (Hz) Figure 18 ...
Page 9
... LOAD CAPACITANCE (pF) Figure 25. Small Signal Overshoot vs. Load Capacitance V = ±2. 10M V = ±2.5V SY 100k 1M 10M OS+ OS– 1k Rev Page AD8638/AD8639 140 120 100 100 1k 10k 100k FREQUENCY (Hz) Figure 26. CMRR vs. Frequency 120 100 80 PSRR+ 60 PSRR– – ...
Page 10
... AD8638/AD8639 T = 25°C, unless otherwise noted ±2. 200pF 10kΩ L TIME (2µs/DIV) Figure 29. Large Signal Transient Response V = ±2. 200pF 10kΩ L TIME (2µs/DIV) Figure 30. Small Signal Transient Response 0.05 INPUT VOLTAGE 0 –0. ±2.5V ...
Page 11
... TIME (4µs/DIV) Figure 37. Negative Settling Time to 0.1% –0. –1 –2 –3 +2mV 0 –2mV V = ±2.5V SY +2mV 0 –2mV V = ±2.5V SY Rev Page AD8638/AD8639 0. 0. –100 V 0.05 INPUT VOLTAGE 0 OUTPUT VOLTAGE TIME (10µs/DIV) Figure 38. Positive Overload Recovery INPUT ERROR BAND OUTPUT V = ±8V SY TIME (4µs/DIV) Figure 39 ...
Page 12
... AD8638/AD8639 T = 25°C, unless otherwise noted ±2.5V SY 100 100 FREQUENCY (Hz) Figure 41. Voltage Noise Density vs. Frequency 1 ±2.5V SY 1.0 0.5 0 –0.5 –1.0 –1 TIME (Seconds) Figure 42. 0 Noise 1250 +125°C +85°C 1000 750 –40°C 500 250 ...
Page 13
... V (V) CM Figure 49. Input Bias Current vs. Input Common-Mode Voltage R = 2kΩ 10kΩ L 10k 100k 10k 100k Rev Page AD8638/AD8639 ± –100 V –20 –40 – 2kΩ L –80 –100 R L –120 –140 100 ...
Page 14
... For example, when an amplifier with 5 μV p-p 1/f noise is configured for a gain of 1000, its output has error due to the 1/f noise. However, the AD8638/AD8639 eliminate 1/f noise internally and thus significantly reduce output errors. ...
Page 15
... As long as the rate of change of the current is not too fast, an auto-zero amplifier can be used with excellent results. OUTPUT AMPLIFIER FOR HIGH PRECISION DACS The AD8638/AD8639 can be used as output amplifiers for a 16-bit high precision DAC in a unipolar configuration. In this case, the selected op amp needs to have very low offset voltage 100kΩ ...
Page 16
... AD8638/AD8639 OUTLINE DIMENSIONS 1.70 1.60 1.50 1.30 1.15 0.90 0.15 MAX 0.05 MIN 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 3.00 2.90 2. 3.00 2.80 2. 0.95 BSC 1.90 BSC 0.20 MAX 1.45 MAX 0.08 MIN 0.95 MIN SEATING 0.50 MAX PLANE 0.35 MIN COMPLIANT TO JEDEC STANDARDS MO-178-AA Figure 55. 5-Lead Small Outline Transistor Package [SOT-23] (RJ-5) Dimensions shown in millimeters 5.00 (0.1968) 4.80 (0.1890 6.20 (0.2441) 4.00 (0.1574) 1 5.80 (0.2284) 3.80 (0.1497 ...
Page 17
... Body, Very Very Thin, Dual Lead (CP-8-5) Dimensions shown in millimeters Rev Page 15° MAX 0.80 0.23 6° 0.55 0.09 0° 0.40 2.48 2.38 2. EXPOSED 1.74 PAD 1.64 1. PIN 1 INDICATOR BOTTOM VIEW (R 0.2) FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION SECTION OF THIS DATA SHEET. COPLANARITY 0.08 AD8638/AD8639 ...
Page 18
... AD8638ARJZ-R2 −40°C to +125°C AD8638ARJZ-REEL −40°C to +125°C AD8638ARJZ-REEL7 −40°C to +125°C AD8638ARZ −40°C to +125°C AD8638ARZ-REEL −40°C to +125°C AD8638ARZ-REEL7 −40°C to +125°C AD8639ACPZ-R2 −40°C to +125°C AD8639ACPZ-REEL −40°C to +125°C AD8639ACPZ-REEL7 − ...
Page 19
... NOTES Rev Page AD8638/AD8639 ...
Page 20
... AD8638/AD8639 NOTES ©2007–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06895-0-6/10(F) Rev Page ...