MAX4482ASA中文资料

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General Description

The MAX4480–MAX4483 low-cost, general-purpose op amps offer Rail-to-Rail ?outputs, draw only 50μA of quies-cent current, and operate from a single +2.5V to +5.5V supply. For additional power conservation, the MAX4481offers a low-power shutdown mode that reduces supply current to 0.5μA (max) and puts the amplifier’s output in a high-impedance state. These devices are unity-gain sta-ble with capacitive loads up to 400pF. The MAX4480–MAX4483 are specified to +125°C, making them suitable for use in a variety of harsh environments, such as auto-motive applications.

The MAX4480 is a single amplifier offered in a tiny 5-pin SC70 package. The MAX4481 is a single amplifier with a low-power shutdown mode that reduces supply cur-rent to <0.5μA and comes in a 6-pin SC70 package.The MAX4482 is a dual amplifier and comes in the space-saving 8-pin SOT23 package. The MAX4483 is a quad amplifier and comes in a 14-pin TSSOP package.All devices are specified for operation across the -40°C to +125°C automotive temperature range.

Applications

Single-Supply Zero-Crossing Detectors Instruments and Terminals Portable Communications Electronic Ignition Modules Infrared Receivers Sensor Signal Detection

Features

o Single +2.5V to +5.5V Supply Voltage Range o 50μA Quiescent Current per Amplifier o 0.5μA (max) Shutdown Mode (MAX4481)o Available in Space-Saving Packages

5-Pin SC70 (MAX4480)6-Pin SC70 (MAX4481)8-Pin SOT23 (MAX4482)o 105dB A VOL with 5k ?Load o 0.005% THD with 100k ?Load o Rail-to-Rail Output Voltage Swing o 3.0mA of Sink and Source Load Current o Unity-Gain Stable up to C LOAD = 400pF

MAX4480–MAX4483

Single/Dual/Quad, Low-Cost, Single-Supply,

Rail-to-Rail Op Amps with Shutdown

________________________________________________________________Maxim Integrated Products

19-1809; Rev 1; 1/01

Pin Configurations

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.Pin Configurations continued at end of data sheet.

Ordering Information

M A X 4480–M A X 4483

Single/Dual/Quad, Low-Cost, Single-Supply,Rail-to-Rail Op Amps with Shutdown 2

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V DD = +5V, V SS = 0, V CM = 0, V OUT = V DD /2, R L ≥1M ?connected to V DD /2, SHDN = V DD (MAX4481 only), T A = +25°C , unless otherwise noted.)

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.

Power-Supply Voltage (V DD to V SS ).........................-0.3V to +6V All Other Pins...................................(V SS - 0.3V) to (V DD + 0.3V)Output Short-Circuit Duration

(OUT shorted to V SS or V DD ).................................Continuous Continuous Power Dissipation (T A = +70°C)

5-Pin SC70 (derate 3.1mW/°C above +70°C).............247mW 6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW 5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW 6-Pin SOT23 (derate 8.7mW/°C above +70°C)............696mW

8-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW 8-Pin μMAX (derate 4.5mW/°C above +70°C)............362mW 8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW 14-Pin TSSOP (derate 9.03mW/°C above +70°C).......727mW 14-Pin SO (derate 8.33mW/°C above +70°C).............667mW Operating Temperature Range .........................-40°C to +125°C Junction Temperature........................................................150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°C

MAX4480–MAX4483

Single/Dual/Quad, Low-Cost, Single-Supply,

Rail-to-Rail Op Amps with Shutdown

_______________________________________________________________________________________3

ELECTRICAL CHARACTERISTICS (continued)

(V DD = +5V, V SS = 0, V CM = 0, V OUT = V DD /2, R L ≥1M ?connected to V DD /2, SHDN = V DD (MAX4481 only), T A = +25°C , unless otherwise noted.)

(V DD = +5V, V SS = 0, V CM = 0, V OUT = V DD /2, R L ≥1M ?connected to V DD /2, SHDN = V DD (MAX4481 only), T A = -40°C to +125°C ,unless otherwise noted.) (Note 2)

Note 2:Specifications are 100% tested at T A = +25°C (exceptions noted). All temperature limits are guaranteed by design.

M A X 4480–M A X 4483

Single/Dual/Quad, Low-Cost, Single-Supply,Rail-to-Rail Op Amps with Shutdown 4_______________________________________________________________________________________

-100-120-140-160-180

100k

FREQUENCY (Hz)

100

10k

806040200-20-40-60-80GAIN AND PHASE vs. FREQUENCY (NO LOAD)

G A I N (d B )/P H A S E (d e g r e e s )

806040200-20-40-60-80-100-120-140-160-180

GAIN AND PHASE

vs. FREQUENCY (C L = 400pF)

FREQUENCY (Hz)

G A I N (d B )/P H A S E (d e g r e e s )

100

100k

10k

M A X 4480 t o c 03

100

10k

100k

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

FREQUENCY (Hz)

P S R R (d B )10-110

-90

-10-30-50-70FREQUENCY (Hz)

10001

100

10k

100k

OUTPUT IMPEDANCE vs. FREQUENCY

0.1M A X 4480 t o c 4

O U T P U T I M P E D A N C E (?)

100.01

1001M

40-400

-20

100120

SUPPLY CURRENT vs. TEMPERATURE

M A X 4480 t o c 05

TEMPERATURE (°C)

S U P P L Y C U R R E N T (μA )

44464850525456586010

-400

-20

100120

MAX4481

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

S U P P L Y C U R R

E N T (p A )

11001k

10k 100k

-400

-20

100120

MAX4481

OUTPUT LEAKAGE CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

I L E A K

(p A )

101k

10k

100k

1000k

100-1500

-1000-500

500

10001500-400

-20

100120

INPUT OFFSET VOLTAGE vs. TEMPERATURE

TEMPERATURE (°C)

V O

S (μV )

80705040

90100-4004080-202060100120

OUTPUT VOLTAGE SWING HIGH

vs. TEMPERATURE

TEMPERATURE (°C)

V D D - V O U T (m V )

60Typical Operating Characteristics

(V DD = +5V, V SS = 0, V CM = V DD /2, V SHDN = 5V, R L ≥1M ?connected to V DD /2, T A = +25°C, unless otherwise noted.)

MAX4480–MAX4483

Single/Dual/Quad, Low-Cost, Single-Supply,

Rail-to-Rail Op Amps with Shutdown

_______________________________________________________________________________________5

47891011

-400

-20

100120

OUTPUT VOLTAGE SWING LOW

vs. TEMPERATURE

TEMPERATURE (°C)

V O U T - V S S (m V )

-90

-82

-80-400

-20

100120

COMMON-MODE REJECTION RATIO

vs. TEMPERATURE

M A X 4480 t o c 11

TEMPERATURE (°C)

C M R R (d B )

-88

-86

-8480105115

11085

120125130

0.5

1.5

2.5

3.5

1.0

2.0

3.0

4.0

4.5

LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE

V OUT (V)

G A I N (d B )

90100959095

100

105110

-400

-20

100120

LARGE-SIGNAL GAIN vs. TEMPERATURE

TEMPERATURE (°C)

G A I N (d B )

-400

80-20

100120

MINIMUM OPERATING VOLTAGE

vs. TEMPERATURE

M A X 4480 t o c 14

TEMPERATURE (°C)

V D D (M I N )

1.21.41.31.61.51.71.91.8

2.01.01.1

101k 10010k 100k

TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY

FREQUENCY (Hz)

T H D + N (%)

100

100.11

0.001

0.01

1k 100

10k

100k

TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY

FREQUENCY (Hz)

T H D + N (%)

100

0.001

101

0.01

0.1V IN (Vp-p)

T H D + N (%)

100

0.001

0.01

0.1110TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT AMPLITUDE

0.001

0.01

0.1

10100

1.0

0.5

1.5

2.0

2.5

3.0

TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT AMPLITUDE

V IN (Vp-p)

T H D + N (%)

Typical Operating Characteristics (continued)

(V DD = +5V, V SS = 0, V CM = V DD /2, V SHDN = 5V, R L ≥1M ?connected to V DD /2, T A = +25°C, unless otherwise noted.)

M A X 4480–M A X 4483

Single/Dual/Quad, Low-Cost, Single-Supply,Rail-to-Rail Op Amps with Shutdown 6_______________________________________________________________________________________

Typical Operating Characteristics (continued)

(V DD = +5V, V SS = 0, V CM = V DD /2, V SHDN = 5V, R L ≥1M ?connected to V DD /2, T A = +25°C, unless otherwise noted.)

CAPACITIVE-LOAD STABILITY

01k

10k

100k

RESISTIVE LOAD (?)

C A P A C I T I V E L O A

D (n F )

NONINVERTING SMALL-SIGNAL

TRANSIENT RESPONSE

20μs/div

A V = 1V/V R

L = 5k ?

50mV/div

OUT

NONINVERTING LARGE-SIGNAL

TRANSIENT RESPONSE

100μs/div

A V = 1V/V R L = 5k ?

1V/div

OUT

010

2015250

200

300100

400

500

600

PERCENT OVERSHOOT vs. CAPACITIVE LOAD

C LOA

D (pF)

O V E R S H O O T (%)

201040305060

0231456

SUPPLY CURRENT vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

S U P P L Y C U R R E N T (μA )

2050408070601101009012010

100

10k

100k

1M CHANNEL-TO-CHANNEL ISOLATION

vs. FREQUENCY

M A X 4480 t o c 23

FREQUENCY (kHz)C H A N N E L -T O -C H A N N E L I S O L A T I O N (d B )

MAX4480–MAX4483

Single/Dual/Quad, Low-Cost, Single-Supply,

Rail-to-Rail Op Amps with Shutdown

_______________________________________________________________________________________

Pin Description

Detailed Description

Rail-to-Rail Output Stage

The MAX4480–MAX4483 can drive a 5k ?load and still typically swing within 80mV of the supply rails. Figure 1shows the MAX4480 output voltage swing configured with A V = +10V/V.

Driving Capacitive Loads

Driving a capacitive load can cause instability in many op amps, especially those with low quiescent current.The MAX4480–MAX4483 are unity-gain stable for a range of capacitive loads to above 400pF. Figure 2shows the MAX4480 response with an excessive capacitive load. Adding a series resistor between the output and the load capacitor (Figure 3) improves the

1V/div

100μs/div

Figure 1. Rail-to-Rail Output Operation

MAX4483

MAX4482

MAX4480

MAX4481

IN+——1Noninverting Amplifier Input 1OUTC OUTD V DD SHDN

INC-IND-OUT OUTA OUTB V SS IN-INA-INB-IND+INC+INB+INA+NAME 8144—

913—1711—26121053PIN

——8—

———174—26——53Amplifier Output C ——Amplifier Output D

——Positive Supply. Use a 0.01μF bypass capacitor to GND.65Active-Low Shutdown Input. Connect to V DD for normal operation. Do not leave floating.

—

Inverting Amplifier Input C ——Inverting Amplifier Input D ——Amplifier Output 44Amplifier Output A ——Amplifier Output B ——Negative Supply. Connect to ground for single-supply operation. Use a 0.01μF bypass capacitor to GND.22Inverting Amplifier Input 33Inverting Amplifier Input A ——Inverting Amplifier Input B ——Noninverting Amplifier Input D

——Noninverting Amplifier Input C ——Noninverting Amplifier Input B ——Noninverting Amplifier Input A ——FUNCTION

M A X 4480–M A X 4483

Single/Dual/Quad, Low-Cost, Single-Supply,Rail-to-Rail Op Amps with Shutdown 8_______________________________________________________________________________________

circuit ’s response by isolating the load capacitance from the op amp ’s output.

Applications Information

Shutdown Mode

The MAX4481 features a low-power shutdown mode.When SHDN goes low, the supply current drops to 0.05μA (typ) and the output enters a high-impedance state. Pull SHDN high to enable the amplifier. Do not leave SHDN floating. Figure 4 shows the shutdown waveform.

Power-Up

The MAX4480–MAX4483 outputs typically settle within 50μs after power-up. Figure 5 shows the output voltage on power-up and power-down.

Power Supplies and Layout

The MAX4480–MAX4483 operate from a single +2.5V to +5.5V power supply. Bypass the power supply with a 0.1μF capacitor to ground.

Good layout techniques optimize performance by decreasing the amount of stray capacitance at the op amp ’s inputs and outputs. To decrease stray capaci-tance, minimize trace lengths by placing external com-ponents close to the op amp ’s pins.

Chip Information

MAX4480/MAX4481 TRANSISTOR COUNT: 111MAX4482 TRANSISTOR COUNT: 209MAX4483 TRANSISTOR COUNT: 407

20μs/div

C L = 1nF

Figure 3. Capacitive-Load-Driving Circuit

400μs/div

R L = 10M ? TO V SS , C L = 25pF

Figure 4. Shutdown Waveform 4μs/div

Figure 5. Power-Up/Down Waveform

Figure 2. Small-Signal Transient Response with Excessive Capacitive Load

MAX4480–MAX4483

Single/Dual/Quad, Low-Cost, Single-Supply,

Rail-to-Rail Op Amps with Shutdown

_______________________________________________________________________________________9

Pin Configurations (continued)

Package Information

M A X 4480–M A X 4483

Single/Dual/Quad, Low-Cost, Single-Supply,Rail-to-Rail Op Amps with Shutdown 10______________________________________________________________________________________

Package Information (continued)

MAX4480–MAX4483

Single/Dual/Quad, Low-Cost, Single-Supply,

Rail-to-Rail Op Amps with Shutdown

______________________________________________________________________________________

Package Information (continued)

M A X 4480–M A X 4483

Single/Dual/Quad, Low-Cost, Single-Supply,Rail-to-Rail Op Amps with Shutdown 12______________________________________________________________________________________

Maxim c annot assume responsibility for use of any c irc uitry other than c irc uitry entirely embodied in a Maxim produc t. No c irc uit patent lic enses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

13____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600?2001 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

Single/Dual/Quad, Low-Cost, Single-Supply,

Rail-to-Rail Op Amps with Shutdown

MAX4480–MAX4483

Package Information (continued)