19-1407; Rev 3; 8/99
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
General Description
The MAX4174/MAX4175/MAX4274/MAX4275 GainAmp™ family combines a low-cost Rail-to-Rail® op amp with precision internal gain-setting resistors and VCC / 2 biasing. Factory-trimmed on-chip resistors decrease design size, cost, and layout, and provide 0.1% gain accuracy. Fixed inverting gains from -0.25V/V to -100V/V or noninverting gains from +1.25V/V to +101V/V are available. These devices operate from a single +2.5V to +5.5V supply and consume only 300µA. GainAmp amplifiers are optimally compensated for each gain version, achieving exceptional GBW products up to 23MHz (AV = +25V/V to +101V/V). High-volt- age fault protection withstands ±17V at either input without excessive current draw.
Three versions are available in this amplifier family: single/ dual/quad open-loop, unity-gain stable (MAX4281/ MAX4282/MAX4284); single/dual fixed gain (MAX4174/ MAX4274); and single/dual fixed gain plus internal VCC / 2 bias at the noninverting input (MAX4175/ MAX4275), which simplifies input biasing in single-supply designs. The input common-mode voltage range of the open-loop amplifiers extends from 150mV below the negative supply to within 1.2V of the positive supply. The outputs can swing rail-to-rail and drive a 1kΩ load while maintaining excellent DC accuracy. The amplifier is stable for capacitive loads up to 470pF.
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Applications |
Portable Instruments |
Smart-Card Readers |
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Instruments, Terminals, |
Infrared Receivers for |
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and Bar-Code Readers |
Remote Controls |
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Keyless Entry |
Low-Side Current-Sense |
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Photodiode Preamps |
Amplifiers |
Features
♦GainAmp Family Provides Internal Precision Gain-Setting Resistors in SOT23 (MAX4174/5)
♦0.1% Gain Accuracy (RF/RG) (MAX4174/5, MAX4274/5)
♦54 Standard Gains Available (MAX4174/5, MAX4274/5)
♦Open-Loop Unity-Gain-Stable Op Amps (MAX4281/2/4)
♦Rail-to-Rail Outputs Drive 1kΩ Load
♦Internal VCC / 2 Biasing (MAX4175/MAX4275)
♦+2.5V to +5.5V Single Supply
♦300µA Supply Current
♦Up to 23MHz GBW Product
♦Fault-Protected Inputs Withstand ±17V
♦Stable with Capacitive Loads Up to 470pF with No Isolation Resistor
Ordering Information
PART* |
TEMP. RANGE |
PIN- |
TOP |
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PACKAGE |
MARK |
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MAX4174_EUK-T |
-40°C to +85°C |
5 SOT23-5 |
†† |
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MAX4175_EUK-T |
-40°C to +85°C |
5 SOT23-5 |
†† |
Ordering Information continued at end of data sheet.
* Insert the desired gain code (from the Gain Selection Guide) in the blank to complete the part number.
††Refer to the Gain Selection Guide for a list of preferred gains and SOT Top Marks.
Selector Guide appears at end of data sheet.
Pin Configurations |
Typical Operating Circuit |
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TOP VIEW |
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+5V |
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MAX4174 |
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VCC |
0.1μF |
OUT |
1 |
5 |
VCC |
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VCC |
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RB |
MAX4175 |
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RF |
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VEE |
2 |
+ |
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IN+ |
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0.1μF |
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RG |
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RB |
OUT |
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IN+ |
3 |
4 |
IN- |
INPUT |
VEE |
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IN- |
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SOT23-5 |
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0.1μF |
RG |
RF |
Pin Configurations continued at end of data sheet. |
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VEE |
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† Patent pending
GainAmp is a trademark of Maxim Integrated Products. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
________________________________________________________________ Maxim Integrated Products 1
†MAX4281/2/4 MAX4274/5, MAX4174/5,
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX4174/5, MAX4274/5, MAX4281/2/4
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE) .................................... |
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-0.3V to +6V |
8-Pin µMAX (derate 4.1mW/°C above +70°C) ............ |
330mW |
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Voltage Inputs (IN_) |
(VEE - 0.3V) to (VCC + 0.3V) |
14-Pin SO (derate 8.3mW/°C above +70°C) |
............... |
667mW |
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MAX4281/4282/4284..................... |
16-Pin QSOP (derate 8.3mW/°C above +70°C).......... |
667mW |
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MAX4174/4175/4274/4275 (with respect to GND) |
...........±17V |
Operating Temperature Range ........................... |
- 40°C to +85°C |
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Output Short-Circuit Duration |
Continuous to Either VEE or VCC |
Maximum Junction Temperature ..................................... |
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+150°C |
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(OUT_)..................................... |
Storage Temperature Range ............................. |
- 65°C to +150°C |
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Continuous Power Dissipation (TA = +70°C) |
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Lead Temperature (soldering, 10sec) ............................. |
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+300°C |
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5-Pin SOT23 (derate 7.1mW/°C above +70°C)............. |
571mW |
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8-Pin SO (derate 5.88mW/°C above +70°C)................. |
471mW |
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Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—MAX4174/MAX4175/MAX4274/MAX4275 Fixed-Gain
Amplifiers
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC / 2, RL to VCC / 2, RL = open, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER |
SYMBOL |
CONDITIONS |
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MIN |
TYP |
MAX |
UNITS |
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Supply Voltage Range |
VCC |
Guaranteed by PSRR tests |
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2.5 |
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5.5 |
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V |
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MAX4174/MAX4274 |
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VCC = 3V |
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300 |
460 |
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Supply Current |
ICC |
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VCC = 5V |
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330 |
510 |
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µA |
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(per Amplifier) |
MAX4175/MAX4275, |
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VCC = 3V |
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320 |
480 |
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includes VCC / 2 bias resistors |
VCC = 5V |
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355 |
530 |
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RL = 100kΩ |
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Input Offset Voltage |
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VOS |
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±0.5 |
±2.5 |
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mV |
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Input Offset Voltage Drift |
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±5 |
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µV/°C |
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Input Bias Current |
IBIAS |
IN_+, MAX4174/MAX4274 (Note 2) |
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±0.05 |
±10 |
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nA |
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Inverting Input Resistance |
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AV < 25V/V |
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150 |
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kΩ |
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AV > 25V/V |
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40 |
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Noninverting Input |
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MAX4174/MAX4274 |
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1000 |
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MΩ |
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Resistance |
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MAX4175/MAX4275 |
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75 |
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kΩ |
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IN_+ Bias Voltage |
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MAX4175/MAX4275, VIN+ = VIN- |
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VCC / 2 |
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VCC / 2 |
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V |
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- 0.25 |
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+ 0.25 |
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IN_+ Input Voltage Range |
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Guaranteed by functional test (Note 3) |
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VEE |
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VCC - 1.2 |
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V |
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IN_Input Voltage Range |
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Guaranteed by functional test |
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VEE |
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VCC |
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V |
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Power-Supply Rejection |
PSRR |
VCC = 2.5V to 5.5V |
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70 |
90 |
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dB |
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Ratio |
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Closed-Loop Output |
ROUT |
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0.02 |
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Ω |
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Impedance |
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Short-Circuit Current |
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Shorted to VEE |
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10 |
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mA |
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Shorted to VCC |
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65 |
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RL = 100kΩ |
VCC - VOH |
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2 |
8 |
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Output Voltage Swing |
VOH/VOL |
VOL - VEE |
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2 |
8 |
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mV |
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(Note 4) |
RL = 1kΩ |
VCC - VOH |
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150 |
250 |
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VOL - VEE |
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60 |
150 |
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2 _______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
ELECTRICAL CHARACTERISTICS—MAX4174/MAX4175/MAX4274/MAX4275 Fixed-Gain
Amplifiers (continued)
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC / 2, RL to VCC / 2, RL = open, TA = TMIN to TMAX, unless otherwise noted. Typical
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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Power-Up Time |
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Output settling to 1% |
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1 |
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ms |
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Slew Rate |
SR |
VCC = 5V, VOUT = 4V step |
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0.7 |
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V/µs |
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Settling Time to Within |
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VCC = 5V, VOUT = 4V step |
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7 |
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µs |
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0.01% |
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Input Noise Voltage Density |
en |
f = 10kHz (Note 5) |
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90 |
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nV/√Hz |
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Input Noise Current Density |
in |
f = 10kHz |
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4 |
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fA/√Hz |
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Capacitive Load Stability |
CLOAD |
No sustained oscillations |
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470 |
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pF |
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DC Gain Accuracy |
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(VEE + 25mV) < VOUT < (VCC - 25mV), |
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0.1 |
0.5 |
% |
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RL = 100kΩ (Note 6) |
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Gain = +1.25V/V |
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1700 |
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Gain = +3V/V |
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970 |
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-3dB Bandwidth |
BW-3dB |
Gain = +5V/V |
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970 |
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kHz |
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Gain = +10V/V |
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640 |
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Gain = +25V/V |
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590 |
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Gain = +51V/V |
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330 |
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ELECTRICAL CHARACTERISTICS—MAX4281/MAX4282/MAX4284 Open-Loop Op Amps
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC / 2, RL to VCC / 2, RL = open, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER |
SYMBOL |
CONDITIONS |
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MIN |
TYP |
MAX |
UNITS |
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Supply Voltage Range |
VCC |
Guaranteed by PSRR tests |
2.5 |
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5.5 |
V |
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Supply Current |
ICC |
VCC = 3V |
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290 |
450 |
µA |
(per Amplifier) |
VCC = 5V |
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320 |
500 |
µA |
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Input Offset Voltage |
VOS |
RL = 100kΩ |
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±0.5 |
±2 |
mV |
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Input Offset Voltage Drift |
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±5 |
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µV/°C |
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Input Bias Current |
IBIAS |
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±0.05 |
±10 |
nA |
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Input Offset Current |
IOS |
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±10 |
±1000 |
pA |
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Input Resistance |
RIN |
Differential or common mode |
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1000 |
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MΩ |
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Input Capacitance |
CIN |
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2.5 |
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pF |
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Common-Mode Input |
CMVR |
Guaranteed by CMRR test |
VEE - 0.15 |
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VCC - 1.2 |
V |
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Voltage Range |
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Common-Mode Rejection |
CMRR |
VEE - 0.15V ≤ VCM ≤ VCC - 1.2V |
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60 |
90 |
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dB |
Ratio |
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Power-Supply Rejection |
PSRR |
VCC = 2.5V to 5.5V |
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70 |
90 |
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dB |
Ratio |
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Closed-Loop Output |
ROUT |
AV = 1V/V |
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0.02 |
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Ω |
Impedance |
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MAX4281/2/4 MAX4274/5, MAX4174/5,
_______________________________________________________________________________________ 3
MAX4174/5, MAX4274/5, MAX4281/2/4
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
ELECTRICAL CHARACTERISTICS—MAX4281/MAX4282/MAX4284 Open-Loop Op Amps (continued)
(VCC = +2.5V to +5.5V, VEE = 0, VIN+ = VIN- = VCC / 2, RL to VCC / 2, RL = open, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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Shorted to VEE |
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mA |
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Short-Circuit Current |
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10 |
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Shorted to VCC |
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65 |
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mA |
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VEE + 0.05V < VOUT < VCC - 0.1V, RL = 100kΩ |
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Large-Signal Voltage Gain |
AVOL |
90 |
120 |
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dB |
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VEE + 0.25V < VOUT < VCC - 0.3V, RL = 1kΩ |
80 |
100 |
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dB |
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RL = 100kΩ |
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VCC - VOH |
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2 |
8 |
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Output Voltage Swing |
VOH/VOL |
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VOL - VEE |
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2 |
8 |
mV |
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RL = 1kΩ |
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VCC - VOH |
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160 |
250 |
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VOL - VEE |
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60 |
100 |
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Gain Bandwidth Product |
GBW |
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2 |
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MHz |
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Slew Rate |
SR |
VCC = 5V, VOUT = 4V step |
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0.7 |
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V/µs |
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Settling Time to within 0.01% |
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VCC = 5V, VOUT = 4V step |
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7 |
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µs |
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Input Noise Voltage Density |
en |
f = 10kHz |
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60 |
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nV/√Hz |
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Input Noise Current Density |
in |
f = 10kHz |
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1.8 |
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fA/√Hz |
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Capacitive Load Stability |
CLOAD |
No sustained oscillations, AV = 1V/V |
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470 |
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pF |
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Power-Up Time |
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Output settling to 1% |
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1 |
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ms |
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Note 1: MAX4174/MAX4175/MAX4281 and MAX4274/MAX4275/MAX4282 and MAX4284 are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
Note 2: Guaranteed by design.
Note 3: The input common-mode range for IN_+ is guaranteed by a functional test. A similar test is done on the IN_input. See the Applications Information section for more information on the input voltage range of the GainAmp.
Note 4: For AV = -0.5V/V and AV = -0.25V/V, the output voltage swing is limited by the input voltage range. Note 5: Includes noise from on-chip resistors.
Note 6: The gain accuracy test is performed with the GainAmp in noninverting configuration. The output voltage swing is limited by the input voltage range for certain gains and supply voltage conditions. For situations where the output voltage swing is limited by the valid input range, the output limits are adjusted accordingly.
Typical Operating Characteristics
(VCC = +5V, RL = 100kΩ to VCC / 2, small-signal VOUT = 100mVp-p, large-signal VOUT = 1Vp-p, TA = +25°C, unless otherwise noted.)
NORMALIZED GAIN (dB)
LARGE-SIGNAL GAIN vs. FREQUENCY
4
3
2
AV = +1.25V/V
1
0 -1 -2
-3
AV = +2.25V/V
-4 -5
-6
1k 10k 100k 1M
FREQUENCY (Hz)
LARGE-SIGNAL GAIN vs. FREQUENCY
TOC01 |
4 |
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TOC02 |
4 |
3 |
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3 |
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MAX4174 |
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MAX4174 |
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2 |
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AV = +2.5V/V |
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2 |
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(dB) |
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(dB) |
1 |
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1 |
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GAIN |
0 |
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GAIN |
0 |
NORMALIZED |
-1 |
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AV = +4V/V |
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NORMALIZED |
-1 |
-2 |
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-2 |
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-3 |
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-3 |
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-4 |
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-4 |
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-5 |
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-5 |
10M |
-6 |
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-6 |
1k |
10k |
100k |
1M |
10M |
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FREQUENCY (Hz)
LARGE-SIGNAL GAIN vs. FREQUENCY
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AV = +5V/V |
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MAX4174 TOC03 |
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AV = +9V/V |
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1k |
10k |
100k |
1M |
10M |
FREQUENCY (Hz)
4 _______________________________________________________________________________________
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
Typical Operating Characteristics (continued)
(VCC = +5V, RL = 100kΩ to VCC / 2, small-signal VOUT = 100mVp-p, large-signal VOUT = 1Vp-p, TA = +25°C, unless otherwise noted.)
LARGE-SIGNAL GAIN vs. FREQUENCY
|
4 |
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TOC04 |
4 |
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3 |
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3 |
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MAX4174 |
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(dB) |
2 |
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AV = +10V/V |
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2 |
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1 |
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(dB) |
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1 |
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GAIN |
0 |
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GAIN |
0 |
NORMALIZED |
-1 |
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NORMALIZED |
-1 |
-2 |
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AV = +21V/V |
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-2 |
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-3 |
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-3 |
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-4 |
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-4 |
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-5 |
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-5 |
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-6 |
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-6 |
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1k |
10k |
100k |
1M |
10M |
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FREQUENCY (Hz)
MAX4174/MAX4175
LARGE-SIGNAL GAIN vs. FREQUENCY
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TOC05 |
4 |
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3 |
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MAX4174 |
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AV = +25V/V |
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2 |
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(dB) |
1 |
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GAIN |
0 |
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NORMALIZED |
-1 |
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AV = +50V/V |
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-2 |
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-3 |
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-4 |
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-5 |
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-6 |
1k |
10k |
100k |
1M |
10M |
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FREQUENCY (Hz)
LARGE-SIGNAL GAIN vs. FREQUENCY
|
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AV = +51V/V |
MAX4174 TOC06 |
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AV = +100V/V |
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1k |
10k |
100k |
1M |
10M |
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FREQUENCY (Hz) |
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SMALL-SIGNAL GAIN vs. FREQUENCY
|
4 |
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TOC07 |
4 |
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3 |
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3 |
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MAX4174 |
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(dB) |
2 |
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AV = +1.25V/V |
2 |
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(dB) |
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1 |
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1 |
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GAIN |
0 |
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GAIN |
0 |
NORMALIZED |
-1 |
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NORMALIZED |
-1 |
-2 |
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-2 |
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-3 |
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AV = +2.25V/V |
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-3 |
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-4 |
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-4 |
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-5 |
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-5 |
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-6 |
10k |
100k |
1M |
10M |
-6 |
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1k |
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FREQUENCY (Hz)
SMALL-SIGNAL GAIN vs. FREQUENCY
|
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TOC08 |
4 |
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3 |
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MAX4174 |
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AV = +2.5V/V |
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2 |
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(dB) |
1 |
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GAIN |
0 |
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NORMALIZED |
-1 |
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AV = +4V/V |
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-2 |
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-3 |
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-4 |
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-5 |
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-6 |
1k |
10k |
100k |
1M |
10M |
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FREQUENCY (Hz) |
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SMALL-SIGNAL GAIN vs. FREQUENCY
|
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AV = +5V/V |
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MAX4174 TOC09 |
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AV = +9V/V |
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1k |
10k |
100k |
1M |
10M |
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FREQUENCY (Hz) |
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SMALL-SIGNAL GAIN vs. FREQUENCY
|
4 |
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TOC10 |
4 |
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3 |
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3 |
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MAX4174 |
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(dB) |
2 |
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AV = +10V/V |
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2 |
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1 |
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(dB) |
1 |
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GAIN |
0 |
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GAIN |
0 |
NORMALIZED |
-1 |
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NORMALIZED |
-1 |
-2 |
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-2 |
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-3 |
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AV = +21V/V |
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-3 |
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-4 |
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-4 |
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-5 |
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-5 |
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-6 |
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-6 |
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1k |
10k |
100k |
1M |
10M |
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FREQUENCY (Hz) |
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SMALL-SIGNAL GAIN vs. FREQUENCY
|
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TOC11 |
4 |
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3 |
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MAX4174 |
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AV = +25V/V |
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2 |
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(dB) |
1 |
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GAIN |
0 |
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NORMALIZED |
-1 |
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-2 |
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AV = +50V/V |
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-3 |
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-4 |
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-5 |
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-6 |
1k |
10k |
100k |
1M |
10M |
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FREQUENCY (Hz) |
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SMALL-SIGNAL GAIN vs. FREQUENCY
|
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AV = +51V/V |
MAX4174 TOC12 |
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AV = +100V/V |
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1k |
10k |
100k |
1M |
10M |
FREQUENCY (Hz)
MAX4281/2/4 MAX4274/5, MAX4174/5,
_______________________________________________________________________________________ 5
MAX4174/5, MAX4274/5, MAX4281/2/4
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
Typical Operating Characteristics (continued)
(VCC = +5V, RL = 100kΩ to VCC / 2, small-signal VOUT = 100mVp-p, large-signal VOUT = 1Vp-p, TA = +25°C, unless otherwise noted.)
MAX4174/MAX4175
TOTAL HARMONIC DISTORTION vs. FREQUENCY
|
0 |
|
|
TOC13 |
|
VOUT = 1Vp-p |
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||
|
-20 |
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MAX4174 |
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|
-40 |
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(dB) |
-60 |
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THD |
AV = +10V/V |
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|
-80 |
AV = +1.25V/V |
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-100 |
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-120 |
AV = +3V/V |
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1k |
10k |
100k |
1M |
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION vs. FREQUENCY
|
0 |
|
|
TOC14 |
|
VOUT = 1Vp-p |
|
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|
-20 |
|
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MAX4174 |
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|
-40 |
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(dB) |
-60 |
|
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THD |
AV = +51V/V |
|
||
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|||
|
-80 |
|
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-100 |
|
AV = +25V/V |
|
|
-120 |
|
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1k |
10k |
100k |
1M |
|
|
FREQUENCY (Hz) |
|
TOTAL HARMONIC DISTORTION |
TOTAL HARMONIC DISTORTION |
vs. OUTPUT VOLTAGE SWING |
vs. OUTPUT VOLTAGE SWING |
|
-60 |
f = 10kHz |
|
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|
TOC15 |
|
-60 |
f = 10kHz |
|
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TOC16 |
||
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||||||
|
-70 |
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MAX4174 |
|
-70 |
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MAX4174 |
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AV = +51V/V |
|
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||
|
-80 |
|
AV = +10V/V |
|
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-80 |
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||
(dB) |
-90 |
|
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|
(dB) |
-90 |
|
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THD |
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THD |
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||
|
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|
AV = +1.25V/V |
|
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|
AV |
= +25V/V |
|
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||||||
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|||||||
|
-100 |
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-100 |
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||
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AV = +3V/V |
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|
-110 |
|
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-110 |
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-120 |
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-120 |
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|
0 |
0.5 |
1.0 |
1.5 |
2.0 |
2.5 |
3.0 |
3.5 |
4.0 |
4.5 |
5.0 |
|
0 |
0.5 |
1.0 |
1.5 |
2.0 |
2.5 |
3.0 |
3.5 |
4.0 |
4.5 |
5.0 |
|
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|
VOLTAGE SWING (Vp-p) |
|
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|
VOLTAGE SWING (Vp-p) |
|
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|
VOLTAGE NOISE DENSITY vs. FREQUENCY (AV = +1.25, +3, +10)
|
1000 |
17 |
(nV/ÖHz) |
|
MAX4174/5 toc |
DENSITY |
|
AV = +10V/V |
|
AV = +3V/V |
|
|
|
|
NOISE |
100 |
|
|
|
|
VOLTAGE |
|
AV = +1.25V/V |
|
|
10
1 |
10 |
100 |
1k |
10k |
100k |
FREQUENCY (Hz)
VOLTAGE NOISE DENSITY vs. FREQUENCY (AV = +25, +51)
|
1000 |
18 |
(nV/ÖHz) |
|
MAX4174/5 toc |
DENSITY |
AV = +25V/V |
|
NOISE |
100 |
|
|
|
|
VOLTAGE |
AV |
= +51V/V |
|
||
|
INCLUDES RESISTOR NOISE |
|
|
10 |
|
1 |
10 |
100 |
1k |
10k |
100k |
|
|
FREQUENCY (Hz) |
|
|
10
CURRENT NOISE DENSITY (fA/ÖHz)
1
CURRENT NOISE DENSITY vs.
FREQUENCY
MAX4174/5 toc19
1 |
10 |
100 |
1k |
10k |
100k |
FREQUENCY (Hz)
6 _______________________________________________________________________________________