Datasheet

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Low Power, Precision, Auto-Zero Op Amps

Data Sheet

AD8538/AD8539

Rev. B Document Feedback

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FEATURES

Low offset voltage: 13 µV maximum

Input offset drift: 0.03 µV/°C

Single-supply operation: 2.7 V to 5.5 V

High gain, CMRR, and PSRR

Low input bias current: 25 pA

Low supply current: 180 µA

Qualified for automotive applications

APPLICATIONS

Mobile communications

Portable instrumentation

Battery-powered devices

Sensor interfaces

Temperature measurement

Electronic scales

GENERAL DESCRIPTION

The AD8538/AD8539 are very high precision amplifiers featuring

extremely low offset voltage, low input bias current, and low power

consumption. The supply current is less than 215 μA maximum

per amplifier at 5.0 V. Operation is fully specified from 2.7 V to

5.0 V single supply (±1.35 V to ±2.5 V dual supply).

The AD8538/AD8539 operate at very low power making these

amplifiers ideal for battery-powered devices and portable

equipment.

The AD8538/AD8539 are specified over the extended industrial

temperature range (−40°C to +125°C). The AD8538 amplifier is

available in 5-lead TSOT-23, and 8-lead, narrow body SOIC

packages, and the AD8539 amplifier is available in 8-lead, narrow

body SOIC and 8-lead MSOP. See the Ordering Guide for the

automotive part.

PIN CONFIGURATIONS

OUT

V–

+IN

V+

–IN

AD8538

VIEW

(Not to Scale)

06741-002

Figure 1. 5-Lead TSOT-23 (UJ-5)

−IN

+IN

V−

V+

OUT

NC = NO CONNECT

AD8538

TOP VIEW

(Not to Scale)

06741-001

Figure 2. 8-Lead SOIC_N (R-8)

OUT

–IN

+IN

V–

V+

OUT B

–IN B

+IN B

AD8539

VIEW

(Not to Scale)

06741-033

Figure 3. 8-Lead SOIC_N (R-8)

OUT A

–IN

+IN A

V–

V+

OUT B

–IN B

+IN B

AD8539

OP VIEW

(Not to Scale)

06741-034

Figure 4. 8-Lead MSOP (RM-8)

Summary of content (24 pages)

PAGE 1
FEATURES PIN CONFIGURATIONS Low offset voltage: 13 µV maximum Input offset drift: 0.03 µV/°C Single-supply operation: 2.7 V to 5.5 V High gain, CMRR, and PSRR Low input bias current: 25 pA Low supply current: 180 µA Qualified for automotive applications OUT 1 V+ 2 +IN 3 TOP VIEW (Not to Scale) 4 –IN 06741-002 V– Figure 1.
PAGE 2
AD8538/AD8539 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Absolute Maximum Ratings ............................................................7 Applications ....................................................................................... 1 Thermal Resistance .......................................................................7 General Description .......................................................
PAGE 3
Data Sheet AD8538/AD8539 SPECIFICATIONS AD8538 ELECTRICAL SPECIFICATIONS @ VS = 5.0 V, VCM = 2.5 V, VO = 2.5 V, TA = 25°C, unless otherwise specified. Table 1. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol Conditions Min VOS Typ Max Unit 5 13 30 25 100 1.0 50 150 5 µV µV pA pA nA pA pA V dB dB dB dB µV/°C −40°C ≤ TA ≤ +125°C Input Bias Current IB 15 35 0.
PAGE 4
AD8538/AD8539 Data Sheet @ VS = 2.7 V, VCM = 1.35 V, VO = 1.35 V, TA = 25°C, unless otherwise specified. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol Conditions Min VOS Typ Max Unit 5 13 30 25 100 1.0 50 150 2.7 µV µV pA pA nA pA pA V dB dB dB dB µV/°C −40°C ≤ TA ≤ +125°C Input Bias Current IB 15 35 0.
PAGE 5
Data Sheet AD8538/AD8539 AD8539 ELECTRICAL SPECIFICATIONS @ VS = 5.0 V, VCM = 2.5 V, VO = 2.5 V, TA = 25°C, unless otherwise specified. Table 3. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol Conditions Min VOS Typ Max Unit 5 15 30 60 125 1.0 70 400 5 4.8 µV µV pA pA nA pA pA V V dB dB dB dB µV/°C −40°C ≤ TA ≤ +125°C Input Bias Current IB 15 35 0.
PAGE 6
AD8538/AD8539 Data Sheet @ VS = 2.7 V, VCM = 1.35 V, VO = 1.35 V, TA = 25°C, unless otherwise specified. Table 4. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol Conditions Min VOS Typ Max Unit 5 16 30 25 125 1.0 50 300 2.7 2.5 µV µV pA pA nA pA pA V −40°C ≤ TA ≤ +125°C Input Bias Current IB 15 35 0.
PAGE 7
Data Sheet AD8538/AD8539 ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. THERMAL RESISTANCE Table 5. Parameter Supply Voltage Input Voltage Differential Input Voltage Output Short-Circuit Duration to GND Storage Temperature Range Lead Temperature (Soldering, 60 sec) Operating Temperature Range Junction Temperature Range Rating +6 V VSS − 0.3 V to VDD + 0.
PAGE 8
AD8538/AD8539 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS AD8538 CHARACTERISTICS AD8538 only, VSY = 5 V or ±2.5 V, unless otherwise noted. 450 700 600 INPUT BIAS CURRENT (pA) 350 300 250 200 150 100 0 –10.0 –8.4 –6.8 –5.2 –3.6 –2.0 –0.4 1.2 2.8 4.4 6.0 7.6 9.2 400 300 200 100 06741-003 50 500 06741-006 400 NUMBER OF AMPLIFIERS VSY = 5V AND 2.7V VSY = 5V 0V < VCM < 5V TA = 25°C 0 25 45 65 INPUT OFFSET VOLTAGE (µV) Figure 5.
PAGE 9
Data Sheet 70 50 OPEN-LOOP GAIN (dB) VSY – VOH 100 VOL 10 SOURCE 1 30 0.01 0.001 45 20 ФM 10 0 0 SINK 0.1 90 40 0.01 0.1 1 VSY = ±2.5V AND ±1.35V RL = 100kΩ CL = 20pF –10 –20 1k 10 10k LOAD CURRENT (mA) 120 VSY = 5V AND 2.7V TA = 25°C 30 100 VSY – VOH 25 CMRR (dB) 80 20 VOL 15 60 40 10 –25 –10 5 20 35 50 65 80 95 110 0 100 125 06741-013 20 5 06741-010 OUTPUT SATURATION VOLTAGE (mV) Figure 14. AD8538 Open-Loop Gain and Phase vs.
PAGE 10
AD8538/AD8539 1000 VSY = 5V AV = 1 CL = 300pF RL = 10kΩ VSY = 5V AND 2.7V VOLTAGE (1V/DIV) AV = 100 100 OUTPUT IMPEDANCE (Ω) Data Sheet AV = 10 10 AV = 1 1 06741-022 0.01 100 06741-017 0.1 1k 10k 100k 1M TIME (4µs/DIV) FREQUENCY (Hz) Figure 20. AD8538 Large Signal Transient Response Figure 17. AD8538 Closed-Loop Output Impedance vs.
PAGE 11
Data Sheet VSY = 5V TA = 25°C VOLTAGE (1V/DIV) VIN 100 100 1k 10k 06741-023 10 10 VOUT VSY = 5V AV = 1 VIN = 6V p-p RL = 10kΩ 06741-021 VOLTAGE NOISE DENSITY (nV/√Hz) 1000 AD8538/AD8539 TIME (200µs/DIV) FREQUENCY (Hz) Figure 25. AD8538 No Phase Reversal Figure 23. AD8538 Voltage Noise Density 06741-020 VOLTAGE (500nV/DIV) VSY = 5V AND 2.7V TIME (1s/DIV) Figure 24. AD8538 0.1 Hz to 10 Hz Input Voltage Noise Rev.
PAGE 12
AD8538/AD8539 Data Sheet VSY = 2.7 V or ±1.35 V, AD8538 only, unless otherwise noted. 10000 160 OUTPUT SATURATION VOLTAGE (mV) VSY = 2.7V 0V < VCM < 2.7V TA = 25°C 120 100 80 60 40 20 0 –10.0 –8.4 –6.8 –5.2 –3.6 –2.0 –0.4 1.2 2.8 4.4 6.0 7.6 9.2 06741-024 1000 100 10 SOURCE SINK 1 0.1 0.001 0.01 INPUT OFFSET VOLTAGE (µV) Figure 29. AD8538 Output Saturation Voltage vs. Load Current 35 30 NUMBER OF AMPLIFIERS OUTPUT SATURATION VOLTAGE (mV) VSY = 2.
PAGE 13
Data Sheet AD8538/AD8539 1000 VSY = 2.7V TA = 25°C 100 10 10 TIME (4µs/DIV) 06741-032 06741-030 VOLTAGE (500mV/DIV) VOLTAGE NOISE DENSITY (nV/√Hz) VSY = 2.7V AV = 1 CL = 100pF RL = 10kΩ 100 1k 10k FREQUENCY (Hz) Figure 32. AD8538 Large Signal Transient Response Figure 33. AD8538 Voltage Noise Density Rev.
PAGE 14
AD8538/AD8539 Data Sheet AD8539 CHARACTERISTICS AD8539 only, VS = 5 V or ±2.5 V, unless otherwise noted. 800 1000.0 AD8539 VSY = 5V 0 < VCM < 5V TA = 25°C NUMBER OF AMPLIFIERS 600 AD8539 VSY = 5V 100.0 INPUT BIAS CURRENT (pA) 700 500 400 300 200 10.0 1.0 0.1 0.01 06741-035 0 –10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8 9 10 VOS (µV) 5 Figure 34. AD8539 Input Offset Voltage Distribution 45 65 85 TEMPERATURE (°C) 105 125 Figure 37. AD8539 Input Bias Current vs.
PAGE 15
SOURCE, VS = ± 2.5V 1000 100 GAIN (Degrees) SINK, VS = ± 1.35V SOURCE, VS = ± 1.35V SINK, VS = ± 2.5V 10 120 120 100 100 80 80 60 60 40 40 20 20 0 0 –20 –20 –40 –40 –60 1 –100 0.1 0.001 0.01 0.1 1 ILOAD (mA) 10 100 –120 1k Figure 40. AD8539 Output Saturation Voltage vs. Load Current 30 –100 10k 100k FREQUENCY (Hz) –120 10M 1M 140 AD8539 VS = 5V AD8539 VSY = ±2.
PAGE 16
AD8538/AD8539 Data Sheet 1000 AD8539 VSY = 5V AV = 1 CL = 300pF RL = 10kΩ AD8539 VSY = ±2.5V 900 800 VOLTAGE (1V/DIV) 700 ZOUT (Ω) 600 500 400 300 AV = 10 AV = 1 1k 10k 100k FREQUENCY (Hz) 1M 10M TIME (4µs/DIV) Figure 46. AD8539 Closed-Loop Output Impedance vs. Frequency Figure 49. AD8539 Large Signal Transient Response 60 0.15 AD8539 VSY = ±2.5V RL = 2kΩ 5 AD8539 VSY = ±2.5V AV = –50 0.10 INPUT VOLTAGE (50mV/DIV) 50 40 30 OS+ 20 OS– 0.05 3 INPUT VOLTAGE 0 2 –0.05 1 –0.
PAGE 17
Data Sheet AD8538/AD8539 1k AD8539 VSY = ±2.5V AV = 1 RL = 10kΩ VOLTAGE (2V/DIV) INPUT VOLTAGE 10 100 1k 10k FREQUENCY (Hz) 100k OUTPUT VOLTAGE TIME (200µs/DIV) Figure 52. AD8539 Voltage Noise Density Figure 54. AD8539 No Phase Reversal 0.8 0 AD8539 VSY = 5V AV = 1M AD8539 VSY = ±2.5V –20 CHANNEL SEPARATION (dB) 0.6 0.4 0.2 0 –0.2 –0.4 –40 –60 –80 –100 –120 –0.8 –5 –4 –3 –2 –1 0 1 TIME (1s/DIV) 2 3 4 5 –160 100 1k 10k FREQUENCY (Hz) Figure 55. AD8539 Channel Separation vs.
PAGE 18
AD8538/AD8539 Data Sheet VS = 2.7 V or ±1.35 V, TA = 25°C, AD8539 only, unless otherwise noted. OUTPUT SATURATION VOLTAGE (mV) 300 250 200 150 100 50 25 VDD – VOH, RL = 10kΩ 20 VOL, RL = 10kΩ 15 10 VDD – VOH, RL = 100kΩ 5 VOL, RL = 100kΩ 0 –40 –25 –10 5 20 35 50 65 80 TEMPERATURE (°C) 45 110 125 80 AD8539 VSY = ±1.35V –40°C < TA < +125°C 40 AD8539 VSY = ±1.35V RL = 2kΩ 70 35 60 OVERSHOOT (%) 30 25 20 15 50 40 OS+ 30 20 10 OS– 10 5 0 0.016 0.032 0.048 0.064 TCVOS (µV) 0.
PAGE 19
Data Sheet AD8538/AD8539 1k 0 AD8539 VSY = ±1.35V CHANNEL SEPARATION (dB) –20 100 –40 –60 –80 –100 –120 10 100 1k 10k FREQUENCY (Hz) 100k –160 100 Figure 62. AD8539 Voltage Noise Density 1k 10k FREQUENCY (Hz) Figure 63. AD8539 Channel Separation vs. Frequency Rev. B | Page 19 of 24 100k 06741-064 –140 06741-063 VOLTAGE NOISE DENSITY (nV/ Hz) AD8539 VSY = ±1.
PAGE 20
AD8538/AD8539 Data Sheet OUTLINE DIMENSIONS 2.90 BSC 5 4 2.80 BSC 1.60 BSC 1 2 3 0.95 BSC 1.90 BSC *1.00 MAX 0.10 MAX 0.50 0.30 0.20 0.08 8° 4° 0° SEATING PLANE 0.60 0.45 0.30 100708-A *0.90 MAX 0.70 MIN *COMPLIANT TO JEDEC STANDARDS MO-193-AB WITH THE EXCEPTION OF PACKAGE HEIGHT AND THICKNESS. Figure 64. 5-Lead Thin Small Outline Transistor Package [TSOT-23] (UJ-5) 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.
PAGE 21
Data Sheet AD8538/AD8539 3.20 3.00 2.80 8 3.20 3.00 2.80 1 5.15 4.90 4.65 5 4 PIN 1 IDENTIFIER 0.65 BSC 0.95 0.85 0.75 15° MAX 1.10 MAX 0.40 0.25 6° 0° 0.23 0.09 COMPLIANT TO JEDEC STANDARDS MO-187-AA 0.80 0.55 0.40 10-07-2009-B 0.15 0.05 COPLANARITY 0.10 Figure 66.
PAGE 22
AD8538/AD8539 Data Sheet NOTES Rev.
PAGE 23
Data Sheet AD8538/AD8539 NOTES Rev.