Datasheet

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22 µA, RRIO, CMOS,18 V

Operational Amplifiers

Data Sheet

AD8657/AD8659

Rev. B

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FEATURES

Micropower at high voltage (18 V): 22 μA maximum

Low offset voltage: 350 µV maximum

Low input bias current: 20 pA maximum

Gain bandwidth product: 230 kHz at A

= 100 typical

Unity-gain crossover: 230 kHz

−3 dB closed-loop bandwidth: 305 kHz

Single-supply operation: 2.7 V to 18 V

Dual-supply operation: ±1.35 V to ±9 V

Unity-gain stable

Excellent electromagnetic interference immunity

APPLICATIONS

Portable operating systems

Current monitors

4 mA to 20 mA loop drivers

Buffer/level shifting

Multipole filters

Remote/wireless sensors

Low power transimpedance amplifiers

GENERAL DESCRIPTION

The AD8657/AD8659 are dual and quad micropower, precision,

rail-to-rail input/output amplifiers optimized for low power and

wide operating supply voltage range applications.

The AD8657/AD8659 operate from 2.7 V to 18 V with a typical

quiescent supply current of 18 μA. The devices use the Analog

Devices, Inc., patented DigiTrim® trimming technique, which

achieves low offset voltage. The AD8657/AD8659 also have

high immunity to electromagnetic interference.

The combination of low supply current, low offset voltage, very

low input bias current, wide supply range, and rail-to-rail input

and output make the AD8657/AD8659 ideal for current

monitoring in process and motor control applications. The

combination of precision specifications makes these devices

ideal for dc gain and buffering of sensor front ends or high

impedance input sources in wireless or remote sensors or

transmitters.

The AD8657/AD8659 are specified over the extended industrial

temperature range (−40°C to +125°C). The AD8657 is available in

an 8-lead MSOP package and an 8-lead LFCSP package; the

AD8659 is available in a 14-lead SOIC package and 16-lead

LFCSP package.

PIN CONNECTION DIAGRAMS

OUT A

–IN A

+IN A

V–

V+

OUT B

–IN B

+IN B

AD8657

TOP VIEW

(Not to Scale)

08804-001

Figure 1. AD8657 Pin Configuration, 8-Lead MSOP

08804-061

AD8657

TOP VIEW

(

Not to Scale)

NOTES

1. CONNECT THE EXPOSED PAD TO V– OR

LEAVE IT UNCONNECTED.

3+IN A

4V–

1OUT A

2–IN A

6 –IN B

5 +IN B

8 V+

7 OUT B

Figure 2. AD8657 Pin Configuration, 8-Lead LFCSP

Note: For AD8659 pin connections and for more information

about the pin connections for these products, see the Pin

Configurations and Function Descriptions section.

–50 –25 0 25 50 75 100 125

PER AMP (µA)

TEMPERATURE (°C)

= 2.7V

= 18V

08804-023

Figure 3. AD8657, Supply Current vs. Temperature

Table 1. Precision Micropower Op Amps (<250 µA)

Supply Voltage 5 V 12 V to 16 V 36 V

Single AD8538 OP196

AD8603

ADA4051-1

Dual AD8539 AD8657 AD8622

AD8607 ADA4091-2

ADA4051-2 ADA4096-2

Quad

AD8609

AD8659

AD8624

ADA4091-4

ADA4096-4

Summary of content (24 pages)

PAGE 1
22 µA, RRIO, CMOS,18 V Operational Amplifiers AD8657/AD8659 Data Sheet PIN CONNECTION DIAGRAMS Micropower at high voltage (18 V): 22 μA maximum Low offset voltage: 350 µV maximum Low input bias current: 20 pA maximum Gain bandwidth product: 230 kHz at AV = 100 typical Unity-gain crossover: 230 kHz −3 dB closed-loop bandwidth: 305 kHz Single-supply operation: 2.7 V to 18 V Dual-supply operation: ±1.
PAGE 2
AD8657/AD8659 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................9 Applications ....................................................................................... 1 Applications Information .............................................................. 19 General Description ...........................................................
PAGE 3
Data Sheet AD8657/AD8659 SPECIFICATIONS ELECTRICAL CHARACTERISTICS—18 V OPERATION VSY = 18 V, VCM = VSY/2 V, TA = 25°C, unless otherwise specified. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Symbol Test Conditions/Comments VOS VCM = 0 V to 18 V VCM = 0.3 V to 17.7 V, −40°C ≤ TA ≤ +85°C VCM = 0.3 V to 17.7 V, −40°C ≤ TA ≤ +125°C VCM = 0 V to 18 V, −40°C ≤ TA ≤ +125°C Min IB Typ Max Unit 5 350 1.8 2 16 20 2.9 40 5.
PAGE 4
AD8657/AD8659 Data Sheet ELECTRICAL CHARACTERISTICS—10 V OPERATION VSY = 10 V, VCM = VSY/2 V, TA = 25°C, unless otherwise specified. Table 3. Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Symbol Test Conditions/Comments VOS VCM = 0 V to 10 V VCM = 0.3 V to 9.7 V, −40°C ≤ TA ≤ +85°C VCM = 0.3 V to 9.7 V, −40°C ≤ TA ≤ +125°C VCM = 0 V to 10 V, −40°C ≤ TA ≤ +125°C Min IB Typ Max Unit 2 350 1.6 2 16 15 2.6 30 5.
PAGE 5
Data Sheet AD8657/AD8659 ELECTRICAL CHARACTERISTICS—2.7 V OPERATION VSY = 2.7 V, VCM = VSY/2 V, TA = 25°C, unless otherwise specified. Table 4. Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Symbol Test Conditions/Comments VOS VCM = 0 V to 2.7 V VCM = 0.3 V to 2.4 V, −40°C ≤ TA ≤ +85°C VCM = 0.3 V to 2.4 V, −40°C ≤ TA ≤ +125°C VCM = 0 V to 2.7 V, −40°C ≤ TA ≤ +125°C Min IB Typ Max Unit 1 350 1.2 2.5 16 10 2.6 20 5.2 2.
PAGE 6
AD8657/AD8659 Data Sheet ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 5. Parameter Supply Voltage Input Voltage Input Current1 Differential Input Voltage Output Short-Circuit Duration to GND Temperature Ranges Storage Operating Junction Lead Temperature (Soldering, 60 sec) 1 Rating 20.
PAGE 7
Data Sheet AD8657/AD8659 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS AD8657 +IN A 3 TOP VIEW (Not to Scale) V– 4 8 V+ 7 OUT B 6 –IN B 5 +IN B OUT A 1 –IN A 2 +IN A 3 V– 4 8 V+ AD8657 TOP VIEW (Not to Scale) 7 OUT B 6 –IN B 5 +IN B NOTES 1. CONNECT THE EXPOSED PAD TO V– OR LEAVE IT UNCONNECTED. Figure 4. AD8657 Pin Configuration, 8-Lead MSOP 08804-061 –IN A 2 08804-001 OUT A 1 Figure 5. AD8657 Pin Configuration, 8-Lead LFCSP Table 7. Pin Function Descriptions, AD8657 Pin No.
PAGE 8
12 +IN D V+ 3 V+ 4 +IN B 5 TOP VIEW 11 V– (Not to Scale) 10 +IN C +IN B 4 AD8659 –IN B 6 9 –IN C OUT B 7 8 OUT C 13 NC 15 OUT A 11 +IN D TOP VIEW 10 V– (Not to Scale) 9 +IN C NOTES 1. NIC = NO INTERNAL CONNECTION. 2. CONNECT THE EXPOSED PAD TO V– OR LEAVE IT UNCONNECTED. 08804-104 +IN A 3 12 –IN D AD8659 OUT C 7 –IN C 8 +IN A 2 –IN B 5 –IN A 1 13 –IN D OUT B 6 14 OUT D –IN A 2 08804-103 OUT A 1 14 OUT D Data Sheet 16 NIC AD8657/AD8659 Figure 7.
PAGE 9
Data Sheet AD8657/AD8659 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. 160 160 Figure 8. Input Offset Voltage Distribution 140 120 80 60 20 VSY = 2.7V –40°C ≤ TA ≤ +125°C 16 VSY = 18V –40°C ≤ TA ≤ +125°C 18 16 14 NUMBER OF AMPLIFIERS 12 10 8 6 4 14 12 10 8 6 4 2 2 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 TCVOS (µV/°C) 0 TCVOS (µV/°C) Figure 9. Input Offset Voltage Drift Distribution Figure 12.
PAGE 10
AD8657/AD8659 Data Sheet 3.0 3.0 VSY = 2.7V –40°C ≤ TA ≤ +85°C 2.0 1.5 1.5 1.0 1.0 0.5 0.5 VOS (mV) 2.0 –0.5 0 –0.5 –1.0 –1.0 –1.5 –1.5 –2.0 –2.0 –2.5 –2.5 –3.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 VCM (V) –3.0 0 4 6 8 10 VCM (V) 12 14 18 16 Figure 14. Input Offset Voltage vs. Common-Mode Voltage Figure 17. Input Offset Voltage vs. Common-Mode Voltage 6 6 VSY = 2.7V –40°C ≤ TA ≤ +125°C 4 VSY = 18V –40°C ≤ TA ≤ +125°C 4 2 0 0 –2 –2 –4 –4 0.3 0.6 0.9 1.
PAGE 11
Data Sheet AD8657/AD8659 4 4 VSY = 18V 3 3 2 2 1 1 IB (nA) 0 125°C 85°C 25°C –1 –2 –2 –3 –3 0.9 1.2 1.5 1.8 2.1 2.4 2.7 VCM (V) 0 2 4 6 8 10 12 14 16 Figure 23. Input Bias Current vs. Common-Mode Voltage 10 10 OUTPUT VOLTAGE (VOH) TO SUPPLY RAIL (V) Figure 20. Input Bias Current vs. Common-Mode Voltage VSY = 2.7V 1 –40°C +25°C +85°C +125°C 100m 10m 1m 0.01 0.1 1 LOAD CURRENT (mA) 10 100 VSY = 18V 1 –40°C +25°C +85°C +125°C 100m 10m 1m 0.1m 0.01m 0.
PAGE 12
AD8657/AD8659 Data Sheet 2.700 18.000 RL = 1MΩ RL = 1MΩ OUTPUT VOLTAGE, VOH (V) 2.698 2.697 RL = 100kΩ 17.995 17.990 17.985 17.980 2.696 VSY = 2.7V 0 –25 25 50 75 100 125 TEMPERATURE (°C) 17.975 –50 –25 0 25 50 100 125 Figure 29. Output Voltage (VOH) vs. Temperature Figure 26. Output Voltage (VOH) vs. Temperature 12 12 VSY = 18V VSY = 2.
PAGE 13
Data Sheet AD8657/AD8659 60 40 35 50 VSY = 2.7V VSY = 18V ISY PER AMP (µA) ISY PER AMP (µA) 30 25 20 15 40 30 20 10 –40°C +25°C +85°C +125°C 9 12 15 18 VSY (V) 0 –50 135 60 GAIN 0 –45 –20 CL = 10pF OPEN-LOOP GAIN (dB) 45 PHASE (Degrees) 20 08804-021 –135 1M FREQUENCY (Hz) 20 45 0 0 GAIN –45 –20 CL = 10pF 0 10k –135 1M 100k FREQUENCY (Hz) Figure 36. Open-Loop Gain and Phase vs. Frequency 60 VSY = 2.
PAGE 14
AD8657/AD8659 Data Sheet 1000 1000 AV = 100 AV = 100 AV = 10 AV = 10 100 100 AV = 1 ZOUT (Ω) ZOUT (Ω) AV = 1 10 10 1k 10k FREQUENCY (Hz) 100k 08804-026 100 1 100 Figure 38. Output Impedance vs. Frequency 140 VSY = 2.7V VCM = VSY/2 120 60 80 60 40 40 20 20 1k 10k 100k 1M FREQUENCY (Hz) 0 100 1k 10k 100 100 VSY = 18V VSY = 2.7V 80 60 60 PSRR (dB) 80 PSRR+ PSRR– 40 PSRR+ PSRR– 40 1k 10k 100k FREQUENCY (Hz) 1M 0 100 1k 10k 100k FREQUENCY (Hz) Figure 43.
PAGE 15
Data Sheet AD8657/AD8659 70 70 VSY = 2.7V VIN = 10mV p-p RL = 1MΩ 60 OS+ OS– OS+ OS– 50 40 30 40 30 20 20 10 10 100 1000 CAPACITANCE (pF) 0 10 08804-032 100 1000 CAPACITANCE (pF) Figure 44. Small Signal Overshoot vs. Load Capacitance Figure 47. Small Signal Overshoot vs. Load Capacitance VSY = ±1.35V AV = 1 RL = 1MΩ CL = 100pF TIME (100µs/DIV) TIME (100µs/DIV) Figure 45. Large Signal Transient Response Figure 48.
PAGE 16
AD8657/AD8659 Data Sheet INPUT 2 INPUT VOLTAGE (V) VSY = ±1.35 AV = –10 RL = 1MΩ –0.4 OUTPUT VOLTAGE (V) –1 –2 10 1 5 OUTPUT OUTPUT 0 TIME (40µs/DIV) TIME (40µs/DIV) Figure 50. Positive Overload Recovery Figure 53. Positive Overload Recovery VSY = ±9V AV = –10 RL = 1MΩ 2 0.4 0 OUTPUT 0 –1 –5 –2 –10 08804-038 VSY = ±1.35V AV = –10 RL = 1MΩ INPUT 0 TIME (40µs/DIV) TIME (40µs/DIV) Figure 51. Negative Overload Recovery Figure 54.
PAGE 17
Data Sheet AD8657/AD8659 VSY =18V RL = 100kΩ CL = 10pF VOLTAGE (500mV/DIV) VOLTAGE (500mV/DIV) VSY = 2.7V RL = 100kΩ CL = 10pF INPUT +5mV OUTPUT 0 ERROR BAND INPUT +5mV OUTPUT –5mV TIME (10µs/DIV) Figure 56. Negative Settling Time to 0.1% Figure 59. Negative Settling Time to 0.1% 1000 1000 VSY = 18V 100 1 100 1k 10k FREQUENCY (Hz) 100k 1M 1 10 Figure 57. Voltage Noise Density vs. Frequency 100 1k 10k FREQUENCY (Hz) 100k 1M Figure 60. Voltage Noise Density vs.
PAGE 18
AD8657/AD8659 Data Sheet 20 3.0 VSY = 2.7V VIN = 2.6V RL = 1MΩ AV = 1 VSY = 18V VIN = 17.9V RL = 1MΩ AV = 1 18 16 OUTPUT SWING (V) OUTPUT SWING (V) 2.5 2.0 1.5 1.0 14 12 10 8 6 4 0.5 0 100 1k 10k 100k 1M FREQUENCY (Hz) 08804-050 0 10 10 100 1k 10k 100k 1M FREQUENCY (Hz) 08804-053 2 Figure 65. Output Swing vs. Frequency Figure 62. Output Swing vs. Frequency 100 10 VSY = 2.7V VIN = 0.2V RMS RL = 1MΩ AV = 1 10 THD + N (%) THD + N (%) 1 VSY = 18V VIN = 0.
PAGE 19
Data Sheet AD8657/AD8659 APPLICATIONS INFORMATION V+ VB1 I1 M5 +IN x R1 –IN x R2 M3 D1 M8 M9 M10 M11 M4 M16 D2 VB2 M1 OUT x M2 M7 M6 M13 M14 M15 V– 08804-056 M17 M12 Figure 68. Simplified Schematic The AD8657/AD8659 are low power, rail-to-rail input and output precision CMOS amplifiers that operate over a wide supply voltage range of 2.7 V to 18 V.
PAGE 20
AD8657/AD8659 Data Sheet OUTPUT STAGE Inverting Op Amp Configuration The AD8657/AD8659 feature a complementary output stage consisting of the M16 and M17 transistors. These transistors are configured in Class AB topology and are biased by the voltage source, VB2. This topology allows the output voltage to go within millivolts of the supply rails, achieving a rail-to-rail output swing. The output voltage is limited by the output impedance of the transistors, which are low RON MOS devices.
PAGE 21
Data Sheet AD8657/AD8659 COMPARATOR OPERATION—AD8657 An op amp is designed to operate in a closed-loop configuration with feedback from its output to its inverting input. Figure 72 shows the AD8657 configured as a voltage follower with an input voltage that is always kept at midpoint of the power supplies. The same configuration is applied to the unused channel. A1 and A2 indicate the placement of ammeters to measure supply current.
PAGE 22
AD8657/AD8659 Data Sheet EMI REJECTION RATIO Circuit performance is often adversely affected by high frequency electromagnetic interference (EMI). In the event where signal strength is low and transmission lines are long, an op amp must accurately amplify the input signals. However, all op amp pins— the noninverting input, inverting input, positive supply, negative supply, and output pins—are susceptible to EMI signals.
PAGE 23
Data Sheet AD8657/AD8659 OUTLINE DIMENSIONS 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 0.80 0.55 0.40 0.23 0.09 6° 0° 10-07-2009-B 0.15 0.05 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 79. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 2.44 2.34 2.24 3.10 3.00 SQ 2.90 0.50 BSC 8 5 0.50 0.40 0.30 0.80 0.75 0.70 0.30 0.25 0.
PAGE 24
AD8657/AD8659 Data Sheet 8.75 (0.3445) 8.55 (0.3366) 4.00 (0.1575) 3.80 (0.1496) 8 14 1 7 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10 0.51 (0.0201) 0.31 (0.0122) 6.20 (0.2441) 5.80 (0.2283) 0.50 (0.0197) 0.25 (0.0098) 1.75 (0.0689) 1.35 (0.0531) SEATING PLANE 45° 8° 0° 1.27 (0.0500) 0.40 (0.0157) 0.25 (0.0098) 0.17 (0.