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ADA4505-2ACBZ-R7 产品设计参考手册 - ADI（亚德诺）
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ADI（亚德诺）
分类:
运算放大器
封装:
WLCSP-8
描述:
ANALOG DEVICES ADA4505-2ACBZ-R7 运算放大器, 双路, 50 kHz, 2个放大器, 6 V/ms, 1.8V 至 5V, ± 900mV 至 ± 2.5V, WLCSP, 8 引脚
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ADA4505-2ACBZ-R7数据手册
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Circuit Note
CN-0125
Circuit Designs Using Analog Devices Products
Apply these product pairings quickly and with confidence.
For more information and/or support call 1-800-AnalogD
(1-800-262-5643) or visit www.analog.com/circuit.
Devices Connected/Referenced
ADA4505-2
10 µA, Rail-to-Rail I/O, Zero Input Crossover
Distortion Amplifier
ADR1581
1.25 V Micropower, Precision Shunt Voltage
Reference (A Grade)
ADG1636
1Ω Typical On-Resistance, ±5 V, +12 V, +5 V,
and +3.3 V Dual SPDT Switches
High Precision, Low Power, Low Cost Pulse Oximeter Infrared and Red Current Sinks
Using the ADA4505-2 10 µA Zero Input Crossover Distortion Op Amp, ADR1581
Precision Shunt Voltage Reference, and ADG1636 Dual SPDT Switches
Rev. 0
“Circuits from the Lab” from Analog Devices have been designed and built by Analog Devices
engineers. Standard engineering practices have been employed in the design and construction of
each circuit, and their function and performance have been tested and verified in a lab environment
at room temperature. However, you are solely responsible for testing the circuit and determining its
suitability and applicability for your use and application. Accordingly, in no event shall Analog
Devices be liable for direct, indirect, special, incidental, consequential or punitive damages due to
any cause whatsoever connected to the use of any “Circuit from the Lab”. (Continued on last page)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved.
CIRCUIT FUNCTION AND BENEFITS
Current sources or current sinks are key circuits used broadly in
medical, industrial, communication, and other types of
equipment for sensor excitation. A good example is the current
sources (sinks) needed to drive the internal IR (infrared) and
R (red) LEDs in a pulse oximetry sensor.
A pulse oximeter is a noninvasive medical device used for
continuously measuring the percentage of hemoglobin (Hb)
saturated with oxygen and the pulse rate of a patient. Hemog-
lobin that is carrying oxygen (oxyhemoglobin) absorbs light in
the infrared (IR) region of the spectrum; hemoglobin that is not
carrying oxygen (deoxyhemoglobin) absorbs visible red (R) light.
In pulse oximetry, a clip containing two LEDs (sometimes more,
depending on the complexity of the measurement algorithm) and
the light sensor (photodiode) is placed on the finger or earlobe
of the patient. One LED emits red light (wavelengths of 600 nm to
700 nm), and the other emits light in the near IR (wavelengths
800 nm to 900 nm) region. The clip is connected by a cable to a
processor unit. The LEDs are rapidly and sequentially excited
by two current sources (one for each LED) whose dc levels
depend on the LED being driven, based on manufacturer
requirements. The detector is synchronized to capture the light
from each LED as it is transmitted through the tissue.
08532-001
ADG1636
S1A
D1
0.1µF
10.3mA
CONNECT TO
RED LED CIRCUIT
D2
S1B
IN1
+5V
+5V
+5V
22Ω
1kΩ
22pF
22pF
121Ω ±0.1%
10kΩ
RED
TIMING
S2A
S2B
IN2
EN
GNDVSS
+5V
+5V
+1.25V
+5V
10kΩ
53.6kΩ
0.1µF
10kΩ
IR
TIMING
ENABLE
ADR1581
1/2
ADA4505-2
IRLMS2002
15.2mA
CONNECT TO
INFRARED LED CIRCUIT
22Ω
1kΩ
82.5Ω ±0.1%
1/2
ADA4505-2
IRLMS2002
VDD
Figure 1. Pulse Oximeter Red and Infrared Current Sources Using the ADA4505-2, ADR1581 Voltage Reference, and ADG1636 Switch
(Simplified Schematic: Decoupling and All Connections Not Shown)
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