Datasheet

ManualsBrandsANALOG DEVICES ManualsLinear ICsLinear IC - Op-amp Voltage feedback MSOP 8

Low Power, Precision

Rail-to-Rail Output Op Amp

Data Sheet

AD8622/AD8624

Rev. D Document Feedback

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Technical Support www.analog.com

FEATURES

Very low offset voltage

125 μV maximum

Supply current: 215 μA/amp typical

Input bias current: 200 pA maximum

Low input offset voltage drift: 1.2 μV/°C maximum

Very low voltage noise: 11 nV/√Hz

Operating temperature: −40°C to +125°C

Rail-to-rail output swing

Unity gain stable

±2.5 V to ±15 V operation

APPLICATIONS

Portable precision instrumentation

Laser diode control loops

Strain gage amplifiers

Medical instrumentation

Thermocouple amplifiers

GENERAL DESCRIPTION

The AD8622/AD8624 are dual and quad precision rail-to-rail

output operational amplifiers with low supply currents of only

350 µA/amplifier maximum over temperature and supply voltages.

The AD8622/AD8624 also has an input bias current cancellation

circuitry that provides a very low input bias current over the full

operating temperature.

With a typical offset voltage of only 10 µV, offset drift of 0.5 µV/°C,

and noise of only 0.2 V p-p (0.1 Hz to 10 Hz), they are perfectly

suited for applications where large error sources cannot be

tolerated. Many systems can take advantage of the low noise,

dc precision, and rail-to-rail output swing provided by the

AD8622/AD8624 to maximize the signal-to-noise ratio and

dynamic range for low power operation. The AD8622/AD8624

are specified for the extended industrial temperature range of

−40°C to +125°C. e AD8622 is available in lead-free 8-lead

SOIC and MSOP packages, while the AD8624 is available in

lead-free 14-lead TSSOP and 16-lead LFCSP packages.

PIN CONFIGURATIONS

OUT A

–IN A

+IN A

V–

V+

OUT B

–IN B

+IN B

AD8622

TOP VIEW

(Not to Scale)

07527-001

Figure 1. 8-Lead Narrow-Body SOIC

UT A 1

–IN A 2

+IN A

V–

V+8

OUT B7

–IN B

+IN B

AD8622

TOP VIEW

(Not to Scale)

7527-002

Figure 2. 8-Lead MSOP

07527-067

AD8624

TOP VIEW

(Not to Scale)

OUT A

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

–IN A

+IN A

V+

+IN B

–IN B

OUT B

Figure 3. 14-Lead TSSOP

07527-068

NOTES

1. NC = NO CONNECT.

2. IT IS RECOMMENDED THAT THE EXPOSED

PAD BE CONNECTED TO V–.

–IN D

+IN D

V–

+IN C

–IN A

V+

+IN A

+IN B

OUT B

–IN B

OUT C

–IN C

OUT

TOP VIEW

(Not to Scale)

AD8624

Figure 4. 16-Lead LFCSP

Table 1. Low Power Op Amps

Supply 40 V 36 V 12 V to 18 V 6 V

Single OP97 OP777 AD8663

OP1177

Dual OP297 OP727 AD8667 ADA4692-2

OP2177

Quad OP497 OP747 AD8669 ADA4692-4

OP4177

Summary of content (20 pages)

PAGE 1
Low Power, Precision Rail-to-Rail Output Op Amp AD8622/AD8624 Data Sheet PIN CONFIGURATIONS Very low offset voltage 125 μV maximum Supply current: 215 μA/amp typical Input bias current: 200 pA maximum Low input offset voltage drift: 1.2 μV/°C maximum Very low voltage noise: 11 nV/√Hz Operating temperature: −40°C to +125°C Rail-to-rail output swing Unity gain stable ±2.
PAGE 2
AD8622/AD8624 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 ESD Caution...................................................................................5 Applications ....................................................................................... 1 Typical Performance Characteristics ..............................................6 General Description ......................................................
PAGE 3
Data Sheet AD8622/AD8624 SPECIFICATIONS ELECTRICAL CHARACTERISTICS—±2.5 V OPERATION VSY = ±2.5 V, VCM = 0 V, TA = 25°C, unless otherwise specified. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol Conditions Min VOS Offset Voltage Drift Input Bias Current ΔVOS/ΔT IB Input Offset Current IOS −40°C ≤ TA ≤ +125°C −40°C ≤ TA ≤ +125°C Typ Max Unit 10 125 230 1.2 200 400 200 300 +1.3 μV μV µV/°C pA pA pA pA V dB dB dB dB GΩ TΩ pF pF 0.
PAGE 4
AD8622/AD8624 Data Sheet ELECTRICAL CHARACTERISTICS—±15 V OPERATION VSY = ±15 V, VCM = 0 V, TA = 25°C, unless otherwise specified. Table 3. Parameter INPUT CHARACTERISTICS Offset Voltage Symbol Conditions Min VOS Offset Voltage Drift Input Bias Current ΔVOS/ΔT IB Input Offset Current IOS −40°C ≤ TA ≤ +125°C −40°C ≤ TA ≤ +125°C Typ Max Unit 10 125 230 1.2 200 500 200 500 +13.8 μV μV μV/°C pA pA pA pA V dB dB dB dB GΩ TΩ pF pF 0.
PAGE 5
Data Sheet AD8622/AD8624 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Input Voltage Input Current1 Differential Input Voltage2 Output Short-Circuit Duration to GND Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature (Soldering, 60 sec) Rating ±18 V ±VSY ±10 mA ±10 V Indefinite −65°C to +150°C −40°C to +125°C −65°C to +150°C 300°C The input pins have clamp diodes to the power supply pins.
PAGE 6
AD8622/AD8624 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. 60 60 VSY = ±2.5V VCM = 0V VSY = ±15V VCM = 0V 50 NUMBER OF AMPLIFIERS 40 30 20 10 40 30 20 –60 –40 –20 0 20 VOS (µV) 40 60 80 100 0 –100 –80 07527-065 0 –100 –80 Figure 5. Input Offset Voltage Distribution –60 –40 –20 0 20 VOS (µV) 60 80 100 Figure 8. Input Offset Voltage Distribution 60 60 VSY = ±2.
PAGE 7
Data Sheet AD8622/AD8624 0 10 VSY = ±15V VSY = ±2.5V IB+ –10 0 IB+ IB– –20 –10 –20 –40 –30 –50 –40 –25 0 25 50 75 100 125 TEMPERATURE (°C) –50 –50 07527-008 –60 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) 07527-011 IB (pA) IB (pA) IB– –30 Figure 14. Input Bias Current vs. Temperature Figure 11. Input Bias Current vs. Temperature 60 50 VSY = ±15V VSY = ±2.5V 25 40 0 20 IB (pA) IB (pA) –25 –50 –75 0 –20 –100 –40 0.5 1.5 2.
PAGE 8
AD8622/AD8624 Data Sheet 0.06 0.16 OUTPUT VOLTAGE TO SUPPLY RAIL (V) 0.05 VCC – VOH 0.04 0.03 0.02 VOL – VEE 0.01 –25 0 25 50 TEMPERATURE (°C) 75 100 125 0.12 VCC – VOH 0.10 0.08 0.06 VOL – VEE 0.04 0.02 0 –50 07527-017 0 –50 VSY = ±15V RL = 10kΩ 0.14 Figure 17. Output Voltage to Supply Rail vs. Temperature –25 0 25 50 TEMPERATURE (°C) 75 100 125 07527-014 OUTPUT VOLTAGE TO SUPPLY RAIL (V) VSY = ±2.5V RL = 10kΩ Figure 20. Output Voltage to Supply Rail vs. Temperature 0.35 0.
PAGE 9
Data Sheet AD8622/AD8624 60 60 VSY = ±2.5V RL = 10kΩ 50 AV = 100 40 30 AV = 10 GAIN (dB) 20 10 AV = 1 0 20 AV = 1 0 –10 –20 –20 –30 –30 –40 100 1k 10k 100k FREQUENCY (Hz) 1M 10M AV = 10 10 –10 –40 100 07527-019 GAIN (dB) 30 AV = 100 Figure 23. Closed-Loop Gain vs. Frequency 1k 10k 100k FREQUENCY (Hz) 1M 10M 07527-016 40 VSY = ±15V RL = 10kΩ 50 Figure 26. Closed-Loop Gain vs. Frequency 10k 10k VSY = ±2.
PAGE 10
AD8622/AD8624 Data Sheet 120 120 VSY = ±2.5V VSY = ±15V 100 100 PSRR+ PSRR+ 80 PSRR (dB) 60 PSRR– PSRR– 40 40 20 20 100 1k 10k FREQUENCY (Hz) 100k 1M 0 10 07527-025 0 10 100 Figure 29. PSRR vs. Frequency 1M 50 VSY = ±2.5V AV = 1 RL = 10kΩ 45 40 VSY = ±15V AV = 1 RL = 10kΩ 40 35 OS– 30 OS+ 25 20 30 15 10 10 5 5 1 CAPACITANCE (nF) 10 100 0 0.01 07527-029 0.1 OS+ 20 15 0 0.01 OS– 25 Figure 30. Small-Signal Overshoot vs. Load Capacitance 0.
PAGE 11
Data Sheet AD8622/AD8624 VSY = ±15V AV = 1 RL = 10kΩ CL = 100pF TIME (10µs/DIV) 07527-028 07527-031 VOLTAGE (50mV/DIV) VOLTAGE (50mV/DIV) VSY = ±2.5V AV = 1 RL = 10kΩ CL = 100pF TIME (10µs/DIV) Figure 35. Small-Signal Transient Response Figure 38. Small-Signal Transient Response 0.4 0.4 INPUT OUTPUT 0 0 INPUT VOLTAGE (V) OUTPUT 0 –1 –10 –2 –20 –3 TIME (20µs/DIV) 07527-032 INPUT VOLTAGE (V) 0 OUTPUT VOLTAGE (V) INPUT VSY = ±15V AV = –100 RL = 10kΩ 0.2 07527-035 0.
PAGE 12
AD8622/AD8624 Data Sheet 12 12 VSY = ±15V AV = +1 10 10 8 8 0.1% OUTPUT STEP (V) 0.01% 6 4 0.1% 0.01% 6 4 5 0 10 20 25 15 SETTLING TIME (µs) 30 35 0 07527-034 0 5 0 Figure 41. Output Step vs. Settling Time 10 100 VSY = ±15V 10 10 1 100 1k FREQUENCY (Hz) 1 07527-042 1 10 1 CURRENT NOISE DENSITY (pA/ Hz) RS2 UNCORRELATED RS1 = 0Ω CORRELATED RS1 = RS2 10 100 FREQUENCY (Hz) 1k VSY = ±15V RS2 UNCORRELATED RS1 = 0Ω 0.1 CORRELATED RS1 = RS2 0.01 07527-057 0.
PAGE 13
Data Sheet AD8622/AD8624 TIME (1s/DIV) 07527-040 07527-043 INPUT NOISE VOLTAGE (50nV/DIV) VSY = ±15V INPUT NOISE VOLTAGE (50nV/DIV) VSY = ±2.5V TIME (1s/DIV) Figure 47. 0.1 Hz to 10 Hz Noise Figure 49. 0.1 Hz to 10 Hz Noise 1 1 VSY = ±2.5V f = 1kHz RL = 10kΩ VSY = ±15V f = 1kHz RL = 10kΩ 0.1 THD + N (%) 0.01 0.0001 0.001 0.001 0.01 0.1 AMPLITUDE (V rms) 1 10 07527-049 0.001 0.01 Figure 48. THD + Noise vs. Amplitude 0.0001 0.001 0.01 0.1 AMPLITUDE (V rms) 1 Figure 50.
PAGE 14
AD8622/AD8624 Data Sheet 0.1 0.1 VSY = ±15V RL = 10kΩ VIN = 300mV rms VSY = ±2.5V RL = 10kΩ VIN = 300mV rms 0.01 THD + N (%) THD + N (%) 0.01 100 1k FREQUENCY (Hz) 10k 100k 100kΩ 1kΩ RL –40 –60 –80 –100 –120 –140 10 VSY = ±2.5V TO ±15V RL = 10kΩ AV = –100 100 1k FREQUENCY (Hz) 10k 100k 07527-048 CHANNEL SEPARATION (dB) –20 100 1k FREQUENCY (Hz) 10k Figure 53. THD + Noise vs. Frequency Figure 51. THD + Noise vs. Frequency 0 0.0001 10 Figure 52. Channel Separation vs.
PAGE 15
Data Sheet AD8622/AD8624 APPLICATIONS INFORMATION INPUT PROTECTION VIN The maximum differential input voltage that can be applied to the AD8622/AD8624 is determined by the internal diodes connected across its inputs and series resistors at each input.
PAGE 16
AD8622/AD8624 Data Sheet magnetic field. Using the 4.12k:98.8k resistive divider, the bias voltage of the Hall element is reduced to 100 mV, leading to only 250 µA of power consumption. The 3-op-amp in-amp configuration of the AD8622/AD8624 then increases the sensitivity to 55 mV/mT. The key to high CMRR for this in-amp configuration are resistors that are well matched (where R1/R2 = R3/R4) from both the resistive ratio and relative drift.
PAGE 17
Data Sheet AD8622/AD8624 SIMPLIFIED SCHEMATIC V+ R3 R2 R1 Q10 Q11 C1 Q3 Q4 –IN x 500Ω 500Ω Q1 D1 INPUT BIAS CANCELLATION CIRCUITRY Q6 Q5 Q8 OUT x Q2 D2 Q7 D3 V– Figure 58. Simplified Schematic Rev.
PAGE 18
AD8622/AD8624 Data Sheet OUTLINE DIMENSIONS 3.20 3.00 2.80 8 3.20 3.00 2.80 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 100709-B 0.15 0.05 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 59. 8-Lead Mini Small Outline Package [MSOP] (RM-8) 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 (0.0040) COPLANARITY 0.10 SEATING PLANE 6.20 (0.2441) 5.
PAGE 19
Data Sheet AD8622/AD8624 4.10 4.00 SQ 3.90 PIN 1 INDICATOR 0.35 0.30 0.25 0.65 BSC 16 13 PIN 1 INDICATOR 12 1 EXPOSED PAD 2.70 2.60 SQ 2.50 4 9 0.45 0.40 0.35 0.80 0.75 0.70 0.05 MAX 0.02 NOM COPLANARITY 0.08 0.20 REF SEATING PLANE 0.20 MIN BOTTOM VIEW FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND SECTION OF THIS DATA SHEET. 08-16-2010-C TOP VIEW 5 8 COMPLIANT TO JEDEC STANDARDS MO-220-WGGC. Figure 61.