ADA4505-2ARMZ-R2 Analog Devices Inc, ADA4505-2ARMZ-R2 Datasheet

IC OPAMP GP R-R 50KHZ DUAL 8MSOP

ADA4505-2ARMZ-R2

Manufacturer Part Number
ADA4505-2ARMZ-R2
Description
IC OPAMP GP R-R 50KHZ DUAL 8MSOP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of ADA4505-2ARMZ-R2

Design Resources
Precision Pulse Oximeter LED Current Sinks Using ADA4505-2, ADR1581, and ADG1636 (CN0125)
Amplifier Type
Voltage Feedback
Number Of Circuits
2
Output Type
Rail-to-Rail
Slew Rate
0.006 V/µs
Gain Bandwidth Product
50kHz
Current - Input Bias
0.5pA
Voltage - Input Offset
500µV
Current - Supply
7µA
Current - Output / Channel
40mA
Voltage - Supply, Single/dual (±)
1.8 V ~ 5 V, ±0.9 V ~ 2.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
-3db Bandwidth
-
FEATURES
PSRR: 100 dB minimum
CMRR: 105 dB typical
Very low supply current: 10 μA per amplifier maximum
1.8 V to 5 V single-supply or ±0.9 to ±2.5V dual-supply
Rail-to-rail input and output
2.5 mV offset voltage maximum
Very low input bias current: 0.5 pA typical
APPLICATIONS
Pressure and position sensors
Remote security
Medical monitors
Battery-powered consumer equipment
Hazard detectors
GENERAL DESCRIPTION
The ADA4505-2 is a dual micropower amplifier featuring rail-
to-rail input and output swings while operating from a 1.8 V to
5 V single or from ±0.9 V to ±2.5 V dual power supply.
Employing a new circuit technology, this low cost amplifier
offers zero input crossover distortion (excellent PSRR and
CMRR performance) and very low bias current, while operating
with a supply current of less than 10 μA per amplifier.
This combination of features makes the ADA4505-2 amplifier
an ideal choice for battery-powered applications because it
minimizes errors due to power supply voltage variations over
the lifetime of the battery, and maintains high CMRR even for a
rail-to-rail op amp.
Rev. 0
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.
operation
10 μA, Rail-to-Rail I/O, Zero Input
Crossover Distortion Amplifier
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Remote battery-powered sensors, handheld instrumentation
and consumer equipment, hazard detectors (for example, smoke,
fire, and gas), and patient monitors can benefit from the
features of the ADA4505-2 amplifier.
The ADA4505-2 is specified for both the industrial temperature
range (−40°C to +85°C) and the extended industrial temperature
range (−40°C to +125°C). The ADA4505-2 dual amplifiers are
available in the standard 8-lead MSOP package.
The ADA4505-2 is a member of a growing series of zero crossover
op amps offered by Analog Devices, Inc., including the AD8506,
which also operates from a 1.8 V to 5 V single or from ±0.9 V to
±2.5 V dual power supply.
OUT A
–IN A
+IN A
PIN CONFIGURATION
V–
Figure 1. 8-Lead MSOP (RM-8)
1
2
3
4
©2008 Analog Devices, Inc. All rights reserved.
ADA4505-2
(Not to Scale)
TOP VIEW
8
7
6
5
ADA4505-2
V+
OUT B
–IN B
+IN B
www.analog.com

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ADA4505-2ARMZ-R2 Summary of contents

Page 1

... The ADA4505-2 dual amplifiers are available in the standard 8-lead MSOP package. The ADA4505 member of a growing series of zero crossover op amps offered by Analog Devices, Inc., including the AD8506, which also operates from a 1 single or from ±0 ± ...

Page 2

... ADA4505-2 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Pin Configuration ............................................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Electrical Characteristics—5 V Operation................................ 3 Electrical Characteristics—1.8 V Operation ............................ 4 Absolute Maximum Ratings ............................................................ 5 Thermal Resistance ...................................................................... 5 REVISION HISTORY 7/08—Revision 0: Initial Version ESD Caution...................................................................................5   Typical Performance Characteristics ..............................................6   Theory of Operation ...................................................................... 14   ...

Page 3

... T ≤ +125° OUT SY −40°C ≤ T ≤ +125° 100 kΩ pF GBP MΩ pF Φ MΩ kHz kHz n Rev Page ADA4505-2 Min Typ Max Unit 0 300 pA 0. 105 105 120 dB 100 dB 2 μV/°C 220 GΩ ...

Page 4

... ADA4505-2 ELECTRICAL CHARACTERISTICS—1.8 V OPERATION 25°C, unless otherwise specified Table 2. 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 Input Resistance Input Capacitance Differential Mode ...

Page 5

... V SY ±10 mA Table 4. Thermal Resistance ±V SY Package Type Indefinite 8-Lead MSOP (RM-8) −65°C to +150°C −40°C to +125°C −65°C to +150°C ESD CAUTION 300°C Rev Page ADA4505-2 θ θ Unit JA JC 206 44 °C/W ...

Page 6

... ADA4505-2 TYPICAL PERFORMANCE CHARACTERISTICS T = 25°C, unless otherwise noted. A 140 120 100 –3.0 –2.5 –2.0 –1.5 –1.0 –0.5 0 0.5 V (mV) OS Figure 2. Input Offset Voltage Distribution 0.5 1.0 1.5 2.0 2.5 3.0 3.5 TCV (µV/°C) OS Figure 3. Input Offset Voltage Drift Distribution ...

Page 7

... V (V) CM Figure 12. Input Bias Current vs. Common-Mode Voltage 10k 100 10 1 0.1 0.01 0.001 0.01 0.1 1 LOAD CURRENT (mA Supply Rail vs. Load Current and Temperature OH ADA4505 B– 100 125 AND I – –40°C +25°C +85°C +125°C 10 100 ...

Page 8

... ADA4505 25°C, unless otherwise noted. A 10k 100 10 1 0.1 0.01 0.001 0.01 0.1 1 LOAD CURRENT (mA) Figure 14. Output Voltage ( Supply Rail vs. Load Current and Temperature OL 1.800 R = 100kΩ L 1.795 1.790 1.785 R = 10kΩ L 1.780 V = 1.8V SY 1.775 –40 –25 – TEMPERATURE (°C) Figure 15 ...

Page 9

... FREQUENCY (Hz) Figure 23. Open-Loop Gain and Phase vs. Frequency –100 – –1 0 100 1k 10k 100k FREQUENCY (Hz) Figure 24. Closed-Loop Gain vs. Frequency – –100 G = – 0.1 10 100 1k 10k FREQUENCY (Hz) Figure 25. Output Impedance vs. Frequency ADA4505-2 225 180 135 –45 –90 –135 –180 –225 100k 1M ...

Page 10

... ADA4505 25°C, unless otherwise noted. A 120 100 100 1k 10k FREQUENCY (Hz) Figure 26. CMRR vs. Frequency 120 100 PSRR+ PSRR– 100 1k 10k FREQUENCY (Hz) Figure 27. PSRR vs. Frequency 140 130 120 110 100 90 80 –40 –25 – TEMPERATURE (°C) Figure 28. PSRR vs. Temperature 120 V = 1.8V SY 100 ...

Page 11

... 100kΩ 100 CAPACITANCE (pF) Figure 35. Small Signal Overshoot vs. Load Capacitance T LOAD = 100kΩ || 100pF 3.959V p-p TIME (200µs/DIV) Figure 36. Large Signal Transient Response T LOAD = 100kΩ || 100pF TIME (200µs/DIV) Figure 37. Small Signal Transient Response ADA4505-2 OS+ OS– 1000 ...

Page 12

... ADA4505 25°C, unless otherwise noted 0.5 1.0 1.5 2.0 2.5 3.0 V (V) SY Figure 38. Supply Current vs. Supply Voltage V = 1.8V SY 2.95µV p-p TIME (s) Figure 39. 0 Noise 1. 100kΩ L – –100 100kΩ –40 1kΩ –60 –80 –100 –120 –140 100 1k FREQUENCY (Hz) Figure 40 ...

Page 13

... FREQUENCY (Hz) Figure 45. THD + Noise vs. Frequency 1. 1. 100kΩ 10k 100k 0.1 0.01 0.001 10k 100k 10 Rev Page ADA4505 100 1k 10k FREQUENCY (Hz) Figure 46. Output Swing vs. Frequency 100mV p 100kΩ – 100 1k 10k FREQUENCY (Hz) Figure 47. THD + Noise vs. Frequency = 5V = 4.9V = 100kΩ 100k ...

Page 14

... and a voltage noise density of 55 nV/√ kHz. The ADA4505-2 was designed to solve two key problems in low voltage battery-powered applications: battery voltage decrease over time and rail-to-rail input stage distortion. In battery-powered applications, the supply voltage available to the IC is the voltage of the battery ...

Page 15

... CMRR minimum, an input-referred error of 790 μV is introduced. Another part with a CMRR minimum generates a 6.3 mV error. The ADA4505-2 CMRR minimum causes only a 79 μV error. As with the PSRR error, there are complex ways to minimize this error, but the ADA4505-2 solves this problem without incurring unnecessary circuitry complexity or increased cost ...

Page 16

... V 5 OUT1 S1B V– S2A S2B 1 C3 22pF S3A S3B 3 RED CURRENT 9 A2 SOURCE GND +5V U1 1/2 ADA4505 OUT2 V+ 1 V– 22pF INFRARED CURRENT SOURCE ADA4505 Buffer to the Voltage Reference Device +5V R4 53.6kΩ 1.25V REF U3 ADR1581 I_BIT2 I_BIT1 I_BIT0 I_ENA ...

Page 17

... Butterworth. Low power op amps with bandwidths of 50 kHz to 500 kHz should be adequate. The ADA4505-2 with its 50 kHz GBP and 10 μA typical of current consumption meets these requirements. A circuit design of a four-pole Butterworth filter (preceded by a one-pole low-pass filter) is shown in Figure 53. With a 3.3 V battery, the total power consumption of this design is 198 μ ...

Page 18

... ADA4505-2 OUTLINE DIMENSIONS ORDERING GUIDE Model Temperature Range ADA4505-2ARMZ-R2 1 −40°C to +125°C 1 ADA4505-2ARMZ-RL −40°C to +125° RoHS Compliant Part. 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 8° 0.15 0.38 0.23 0° ...

Page 19

... NOTES Rev Page ADA4505-2 ...

Page 20

... ADA4505-2 NOTES ©2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07416-0-7/08(0) Rev Page ...

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