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PDF MAX4477 Data sheet ( Hoja de datos )
| Número de pieza | MAX4477 | |
| Descripción | SOT23 / Low-Noise / Low-Distortion / Wide-Band / Rail-to-Rail Op Amps | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-2137; Rev 1; 10/02
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
General Description
The MAX4475–MAX4478/MAX4488/MAX4489 wide-
band, low-noise, low-distortion operational amplifiers
offer Rail-to-Rail® outputs and single-supply operation
down to 2.7V. They draw 2.2mA of quiescent supply
current per amplifier while featuring ultra-low distortion
(0.0002% THD + N), as well as low input voltage-noise
density (4.5nV/√Hz) and low input current-noise density
(0.5fA/√Hz). These features make the devices an ideal
choice for applications that require low distortion and/or
low noise.
For power conservation, the MAX4475/MAX4488 offer a
low-power shutdown mode that reduces supply current
to 0.01µA and places the amplifiers’ outputs into a high-
impedance state. These amplifiers have outputs which
swing rail-to-rail and their input common-mode voltage
range includes ground. The MAX4475–MAX4478 are
unity-gain stable with a gain-bandwidth product of
10MHz. The MAX4488/MAX4489 are internally compen-
sated for gains of +5V/V or greater with a gain-band-
width product of 42MHz. The single MAX4475/
MAX4476/MAX4488 are available in space-saving,
6-pin SOT23 packages.
Applications
ADC Buffers
DAC Output Amplifiers
Low-Noise Microphone/Preamplifiers
Digital Scales
Strain Gauges/Sensor Amplifiers
Medical Instrumentation
Typical Operating Characteristic
INPUT VOLTAGE-NOISE DENSITY
vs. FREQUENCY
25
20
15
10
5
0
10 100 1k 10k 100k
FREQUENCY (Hz)
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Features
o Low Input Voltage-Noise Density: 4.5nV/√Hz
o Low Input Current-Noise Density: 0.5fA/√Hz
o Low Distortion: 0.0002% THD + N (1kΩ load)
o Single-Supply Operation from +2.7V to +5.5V
o Input Common-Mode Voltage Range Includes
Ground
o Rail-to-Rail Output Swings with a 1kΩ Load
o 10MHz GBW Product, Unity-Gain Stable
(MAX4475–MAX4478)
o 42MHz GBW Product, Stable with AV ≥ +5V/V
(MAX4488/MAX4489)
o Excellent DC Characteristics
VOS = 70µV
IBIAS = 1pA
Large-Signal Voltage Gain = 120dB
o Low-Power Shutdown Mode:
Reduces Supply Current to 0.01µA
Places Output in High-Impedance State
o Available in Space-Saving SOT23, µMAX, and
TSSOP Packages
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX4475AUT-T -40°C to +125°C 6 SOT23-6 AAZV
MAX4475AUA -40°C to +125°C 8 µMAX
—
MAX4475ASA
-40°C to +125°C 8 SO
—
MAX4476AUT-T -40°C to +125°C 6 SOT23-6 AAZX
MAX4477AUA -40°C to +125°C 8 µMAX
—
Ordering Information continued at end of data sheet.
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
Selector Guide
PART
MAX4475
MAX4476
MAX4477
MAX4478
MAX4488
MAX4489
GAIN BW
(MHz)
10
10
10
10
42
42
STABLE
GAIN
(V/V)
1
1
1
1
5
5
NO. OF
AMPS
1
1
2
4
1
2
SHDN
Yes
—
—
—
Yes
—
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
Typical Operating Characteristics (continued)
(VDD = +5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL tied to VDD/2, input noise floor of test equipment =10nV/√Hz for all distortion
measurements, TA = +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. OUTPUT LOAD CURRENT
0.25
VDD = 3V OR 5V
VDIFF = ±10mV
0.20
0.15
VDD - VOH
0.10
VOL
0.05
0
0 1 2 3 4 5 6 7 8 9 10
OUTPUT LOAD CURRENT (mA)
OUTPUT VOLTAGE SWING (VOH)
vs. TEMPERATURE
70
60
50
40
30
RL = 1kΩ
20
10
0
-50 -25
RL = 10kΩ
0 25 50 75 100 125
TEMPERATURE (°C)
OUTPUT VOLTAGE SWING (VOL)
vs. TEMPERATURE
70
60
50
40
30
20
10
0
-50 -25
RL = 1kΩ
RL = 10kΩ
0 25 50 75 100 125
TEMPERATURE (°C)
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
130
120
110 RL = 2kΩ RL = 20kΩ RL = 200kΩ
100
90
80
70
60
50
0
VDD = 3V
RL REFERENCED TO GND
50 100 150 200 250
VOUT SWING FROM EITHER SUPPLY (mV)
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
130
RL = 200kΩ
120
110
RL = 20kΩ
100
RL = 2kΩ
90
80
70
60
50
0
VDD = 5V
RL REFERENCED TO VDD
50 100 150 200 250
VOUT SWING FROM EITHER SUPPLY (mV)
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
130
120
110
RL = 20kΩ RL = 200kΩ
100
90
RL = 2kΩ
80
70
60
50
0
VDD = 3V
RL REFERENCED TO VDD
50 100 150 200 250
VOUT SWING FROM EITHER SUPPLY (mV)
LARGE-SIGNAL VOLTAGE GAIN
vs. TEMPERATURE
140
130
RL = 100kΩ
120
RL = 10kΩ
110
100
90
80
70
60
VOUT = 150mV TO 4.75V
50
-50 -25 0 25 50
75
TEMPERATURE (°C)
100 125
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
130
120
110
RL = 2kΩ
RL = 200kΩ
RL = 20kΩ
100
90
80
70
60
50
0
VDD = 5V
RL REFERENCED TO GND
50 100 150 200 250
VOUT SWING FROM EITHER SUPPLY (mV)
SUPPLY CURRENT vs. TEMPERATURE
3.0
PER AMPLIFIER
2.5
2.0
1.5
1.0
0.5
0
-50 -25
0 25 50 75 100 125
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
5 Page 
SOT23, Low-Noise, Low-Distortion, Wide-Band,
Rail-to-Rail Op Amps
SERIAL
INTERFACE
+5V +2.5V
CS VDD
U1
REF
SCLK
DIN
MAX5541ESA
DGND
OUT
AGND
Typical Application Circuit
+5V
7 U2
3 MAX4475AUA
6
2
48
SHDN
0 to +2.5V
OUTPUT
3.09kΩ
1%
470pF
5V
7.87kΩ
1%
220pF
0.1µF
38
1/2 MAX4477
24
1
10.0kΩ
1%
10.0kΩ
1%
Typical Operating Circuit
3.83kΩ
1%
13.7kΩ
1%
220pF
220pF
5
1/2 MAX4477
6
7
10.0kΩ
1%
15.0kΩ
1%
7.15kΩ
1%
220pF
capacitor placed close to the VDD pin. If operating from
dual supplies, bypass each supply to ground.
Good layout improves performance by decreasing the
amount of stray capacitance and noise at the op amp’s
inputs and output. To decrease stray capacitance, min-
imize PC board trace lengths and resistor leads, and
place external components close to the op amp’s pins.
Typical Application Circuit
The Typical Application Circuit shows the single
MAX4475 configured as an output buffer for the
MAX5541 16-bit DAC. Because the MAX5541 has an
unbuffered voltage output, the input bias current of the
op amp used must be less than 6nA to maintain 16-bit
accuracy. The MAX4475 has an input bias current of
only 150pA (max), virtually eliminating this as a source
of error. In addition, the MAX4475 has excellent open-
loop gain and common-mode rejection, making this an
excellent ouput buffer amplifier.
DC-Accurate Lowpass Filter
The MAX4475–MAX4478/MAX4488/MAX4489 offer a
unique combination of low noise, wide bandwidth, and
high gain, making them an excellent choice for active
filters up to 1MHz. The Typical Operating Circuit shows
the dual MAX4477 configured as a 5th order
Chebyschev filter with a cutoff frequency of 100kHz.
The circuit is implemented in the Sallen-Key topology,
making this a DC-accurate filter.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet MAX4477.PDF ] | |
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