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PDF MAX9945 Data sheet ( Hoja de datos )
| Número de pieza | MAX9945 | |
| Descripción | Low-Power Op Amp | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX9945 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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19-4398; Rev 0; 2/09
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
www.datasheet4u.com
General Description
The MAX9945 operational amplifier features an excellent
combination of low operating power and low input volt-
age noise. In addition, MOS inputs enable the MAX9945
to feature low input bias currents and low input current
noise. The device accepts a wide supply voltage range
from 4.75V to 38V and draws a low 400µA quiescent cur-
rent. The MAX9945 is unity-gain stable and is capable of
rail-to-rail output voltage swing.
The MAX9945 is ideal for portable medical and industri-
al applications that require low noise analog front-ends
for performance applications such as photodiode trans-
impedance and chemical sensor interface circuits.
The MAX9945 is available in both an 8-pin µMAX® and
a space-saving, 6-pin TDFN package, and is specified
over the automotive operating temperature range
(-40°C to +125°C).
Applications
Medical Pulse Oximetry
Photodiode Sensor Interface
Industrial Sensors and Instrumentation
Chemical Sensor Interface
High-Performance Audio Line Out
Active Filters and Signal Processing
Features
♦ +4.75V to +38V Single-Supply Voltage Range
♦ ±2.4V to ±19V Dual-Supply Voltage Range
♦ Rail-to-Rail Output Voltage Swing
♦ 400µA Low Quiescent Current
♦ 50fA Low Input Bias Current
♦ 1fA/√Hz Low Input Current Noise
♦ 15nV/√Hz Low Noise
♦ 3MHz Unity-Gain Bandwidth
♦ Wide Temperature Range from -40°C to +125°C
♦ Available in Space-Saving, 6-Pin TDFN Package
(3mm x 3mm)
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX9945ATT+ -40°C to +125°C 6 TDFN-EP*
MAX9945AUA+ -40°C to +125°C 8 µMAX
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
TOP
MARK
AUE
—
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
PHOTODIODE
VCC
IN-
MAX9945
IN+
VEE
OUT
SIGNAL
CONDITIONING/
FILTERS
ADC
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
www.datasheet4u.com
Typical Operating Characteristics (continued)
(VCC = +15V, VEE = -15V, VIN+ = VIN- = GND = 0, ROUT = 100kΩ to GND, TA = -40°C to +125°C, typical values are at TA = +25°C,
unless otherwise noted.)
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
1000
800
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
1000
VCM = VCC - 1.2V
800
600 600
VCM = 0
400 400
200
0
-15
-10 -5 0
5 10
COMMON-MODE VOLTAGE (V)
OPEN-LOOP GAIN
vs. FREQUENCY
120
80
40
0
-40
1m 1 10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
200
0
-40 -20
VCM = VEE
0 20 40 60 80 100 120
TEMPERATURE (°C)
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
-20
-30
-40
-50
-60
-70
-80
-90
-100
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
0
10,000
RESISTOR ISOLATION
vs. CAPACITIVE LOAD
-20
UNSTABLE
-40
-60 UNIPOLAR
PSRR-
-80
-100
UNIPOLAR
PSRR+
BIPOLAR
PSRR
1000
STABLE
-120
1
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
100
1
10
RISO (Ω)
100
_______________________________________________________________________________________ 5
5 Page 
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
www.datasheet4u.com
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
PACKAGE TYPE
6 TDFN-EP
8 µMAX
PACKAGE CODE
T633-2
U8-1
DOCUMENT NO.
21-0137
21-0036
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX9945.PDF ] | |
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