MAX4124中文资料

General Description

The MAX4122–MAX4129 family of operational amplifiers combines wide bandwidth and excellent DC accuracy with Rail-to-Rail ?operation at the inputs and outputs. These devices require only 650μA per amplifier, and operate from either a single supply (+2.7V to +6.5V) or dual supplies (±1.35V to ±3.25V) with a common-mode voltage range that extends 250mV beyond V EE and V CC . They are capa-ble of driving 250?loads. The MAX4122/MAX4123/MAX4126/MAX4127/MAX4129 have a 5MHz gain band-width product, while the decompensated MAX4124/MAX4125/MAX4128 (stable at closed-looped gains of 10 or greater) have a 25MHz gain bandwidth product. In addition, the MAX4123/MAX4125/MAX4127 feature a shutdown mode in which the outputs are placed in a high-impedance state and the supply current is reduced to only 25μA per amplifier.

With their rail-to-rail input common-mode range and output swing, these amplifiers are ideal for low-voltage single-supply operation. Although the minimum operat-ing voltage is specified at 2.7V, the devices typically operate down to 1.8V. In addition, low offset voltage and high speed make them the ideal signal-condition-ing stages for precision, low-voltage, data-acquisition systems. The MAX4122 and MAX4124 come in the space-saving 5-pin SOT23-5 package.

________________________Applications

Battery-Powered Instruments Portable Equipment Data-Acquisition Systems Signal Conditioning

Low-Power, Low-Voltage Applications

Features

o 5-Pin SOT23 Package (MAX4122/4)o +2.7V to +6.5V Single-Supply Operation

o Rail-to-Rail Input Common-Mode Voltage Range o Rail-to-Rail Output Voltage Swing

o 5MHz Gain-Bandwidth Product (MAX4122/3/6/7/9)25MHz Gain-Bandwidth Product (MAX4124/5/8)o 650μA Quiescent Current per Amplifier o 25μA Shutdown Function (MAX4123/5/7)o 200μV Offset Voltage

o No Phase Reversal for Overdriven Inputs o Drive 250?Loads

o Stable with 500pF Capacitive Loads o Unity-Gain Stable (MAX4122/3/6/7/9)Stable at Gains ≥10V/V (MAX4124/5/8)

MAX4122–MAX4129

Single/Dual/Quad, Wide-Bandwidth, Low-Power,

Single-Supply Rail-to-Rail I/O Op Amps

________________________________________________________________Maxim Integrated Products

__________Typical Operating Circuit

19-1087; Rev 1; 8/97

Pin Configurations appear at end of data sheet.

For free samples & the latest literature: https://www.360docs.net/doc/2818440382.html,, or phone 1-800-998-8800.For small orders, phone 408-737-7600 ext. 3468.

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

M A X 4122–M A X 4129

Single-Supply Rail-to-Rail I/O Op Amps 2_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(V CC = +2.7V to +6.5V, V EE = 0V, V CM = 0V, V OUT = V CC /2, R L tied to V CC /2, SHDN ≥2V (or open), 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.

Supply Voltage (V CC -V EE ).....................................................7.5V IN+, IN-, SHDN Voltage...................(V CC + 0.3V) to (V EE - 0.3V)Output Short-Circuit Duration (Note 1).......................Continuous

(short to either supply)

Continuous Power Dissipation (T A = +70°C)

5-pin SOT23-5 (derate 7.1mW/°C above +70°C).........571mW 8-pin SO (derate 5.88mW/°C above +70°C).................471mW 8-pin μMAX (derate 4.10mW/°C above +70°C)............330mW 14-pin SO (derate 8.00mW/°C above +70°C)...............640mW

Operating Temperature Range

MAX412_E__....................................................-40°C to +85°C Maximum Junction Temperature.....................................+150°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°C

Note 1:Provided that the maximum package power-dissipation rating is met.

MAX4122–MAX4129

Single-Supply Rail-to-Rail I/O Op Amps

DC ELECTRICAL CHARACTERISTICS

(V CC = +2.7V to +6.5V, V EE = 0V, V CM = 0V, V OUT = V CC /2, R L tied to V CC /2, SHDN ≥2V (or open), T A = -40°C to +85°C , unless otherwise noted.)

DC ELECTRICAL CHARACTERISTICS (continued)

(V CC = +2.7V to +6.5V, V EE = 0V, V CM = 0V, V OUT = V CC /2, R L tied to V CC /2, SHDN ≥2V (or open), T A = +25°C , unless otherwise noted.)

M A X 4122–M A X 4129

Single-Supply Rail-to-Rail I/O Op Amps

DC ELECTRICAL CHARACTERISTICS (continued)

(V CC = +2.7V to +6.5V, V EE = 0V, V CM = 0V, V OUT = V CC /2, R L tied to V CC /2, SHDN ≥2V (or open), T A = -40°C to +85°C , unless otherwise noted.)

AC ELECTRICAL CHARACTERISTICS

(V CC = +2.7V to +6.5V, V EE = 0V, SHDN ≥2V (or open), T A = +25°C , unless otherwise noted.)

MAX4122–MAX4129

Single-Supply Rail-to-Rail I/O Op Amps

_______________________________________________________________________________________5

-40100

10k

10M

100k

100M

MAX4322/26/29

GAIN AND PHASE vs. FREQUENCY

-20FREQUENCY (Hz)

G A I N (d B )

020

P H A S E (D E G R E E S )

180144

720-72

-144

-180-108-3636108

-40100

10k

10M

100k

100M

MAX4122/23/26/27/29

GAIN AND PHASE vs. FREQUENCY

(WITH C LOAD )

-20

FREQUENCY (Hz)G A I N (d B )

P H A S E (D E G R E E S )180

144

720

-72-144

-180-108-3636108

0-100

1001k 100k 1M 10M 10k 100M

MAX4122/23/26/27/29POWER-SUPPLY REJECTION

vs. FREQUENCY

-80

FREQUENCY (Hz)

P S R (d B )

-60-40-20__________________________________________Typical Operating Characteristics

(V CC = +5V, V EE = 0V, V CM = V CC /2, T A = +25°C, unless otherwise noted.)

AC ELECTRICAL CHARACTERISTICS (continued)

(V CC = +2.7V to +6.5V, V EE = 0V, SHDN ≥2V (or open), T A = +25°C , unless otherwise noted.)

-40100

10k

100k

10M

MAX4124/25/28

GAIN AND PHASE vs. FREQUENCY

-20

FREQUENCY (Hz)

G A I N (d B )

P H A S E (D E G R E E S )0

40180144

-180

-144

-108-72

-36360

10872

-40100

10k

10M

100k

100M

MAX4124/25/28

GAIN AND PHASE vs. FREQUENCY

(WITH C LOAD )-20

FREQUENCY (Hz)G A I N (d B )

40P H A S E (D E G R E E

S )180

144720-72

-144

-180-108-3636108

0-100

1001k 100k 1M 10M 10k 100M

MAX4124/25/28

POWER-SUPPLY REJECTION

vs. FREQUENCY

-80FREQUENCY (Hz)

P S R (d B )

-60-40-20

Typical Operating Characteristics (continued)

(V CC = +5V, V EE = 0V, V CM = V CC /2, T A = +25°C, unless otherwise noted.)

M A X 4122–M A X 4129

Single-Supply Rail-to-Rail I/O Op Amps 6_______________________________________________________________________________________

10k 10M

FREQUENCY (Hz)

100k 1M

100

1305060708090100110120MAX4126/27/28/29

CHANNEL SEPARATION vs. FREQUENCY

M A X 4122/29-07

C H A N N E L S E P A R A T I O N (d B )

100

0.01

100

100k

10M

10k

100M

MAX4122/23/26/27/29OUTPUT IMPEDANCE vs. FREQUENCY

0.1

FREQUENCY (Hz)

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

100

0.1

100

100k

10M

10k

100M

MAX4124/25/28OUTPUT IMPEDANCE vs. FREQUENCY

FREQUENCY (Hz)

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

900500

550600650700750800850-40-25-10

8095SUPPLY CURRENT PER AMPLIFIER

vs. TEMPERATURE

TEMPERATURE (°C)S

U P P L Y C U R R E N T (μA )

2030405060-40-25-105203550658095

MAX4323/MAX4327SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)S H U T D O W N S U P P L Y C U R R E N T (m A

)

-10

-505101520-40-25-10

OUTPUT LEAKAGE CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

L E A K A G E C U R R E N T (μA

)

-3.00

-2.25-0.75-1.5001.500.752.253.00-40-25-10

95INPUT OFFSET VOLTAGE vs. TEMPERATURE

TEMPERATURE (°C)V O L T A G E (

m V )

-50

0123456

INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE

COMMON-MODE VOLTAGE (V)I N P U T B I A S C U R R E N T (n A )

-40-30-20-10010203040

50-60

-50-40-25-10

INPUT BIAS CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

I N P U T B I A S C U R R E N T (n A )

-40-30-20-1001020304050

Typical Operating Characteristics (continued)

(V CC = +5V, V EE = 0V, V CM = V CC /2, T A = +25°C, unless otherwise noted.)

MAX4122–MAX4129

Single-Supply Rail-to-Rail I/O Op Amps

_______________________________________________________________________________________7

12080

859095100105110115-40-25-10

COMMON-MODE REJECTION

vs. TEMPERATURE

TEMPERATURE (°C)

C O M M O N -M O

E R E J E C T I O N (d B )

12060

600

110OUTPUT VOLTAGE: EITHER SUPPLY (mV)

G A I N (

d B )

300

908070100

200

500

100400

LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE

2500

-40-25-10

MINIMUM OUTPUT VOLTAGE

vs. TEMPERATURE

50200

TEMPERATURE (°C)

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

150

100

50100150200250300

-40-25-10

MAXIMUM OUTPUT VOLTAGE

vs. TEMPERATURE

TEMPERATURE (°C)

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

12060

600

110OUTPUT VOLTAGE: EITHER SUPPLY (mV)

G A I N (d B )

300

9080

70100

200

500

100400

LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE

125

-40-25-10

LARGE-SIGNAL GAIN vs. TEMPERATURE

85115

TEMPERATURE (°C)

G A I N (d B )

1059580

90120110100

12060

600

110G A I N (d B )

300908070100200500100400LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE

OUTPUT VOLTAGE: EITHER SUPPLY (mV)

12060

600

110G A I N (d B )

300

8070100

200

500

100

400

LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE

OUTPUT VOLTAGE: EITHER SUPPLY (mV)

125

-40-25-10

LARGE-SIGNAL GAIN

vs. TEMPERATURE

85115TEMPERATURE (°C)

G A I N (d B )

1059580

90120110100

Typical Operating Characteristics (continued)

(V CC = +5V, V EE = 0V, V CM = V CC /2, T A = +25°C, unless otherwise noted.)

M A X 4122–M A X 4129

Single-Supply Rail-to-Rail I/O Op Amps 8_______________________________________________________________________________________

IN (5mV/div)TIME (200ns/div)OUT (50mV/div)A V = +10

MAX4124/25/28

SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING)

M A X 4122/29-31

IN (5mV/div)

TIME (200ns/div)

OUT (50mV/div)

A V = -10

MAX4124/25/28

SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING)

M A X 4122/29-32

IN (2V/div)

TIME (2μs/div)

OUT (2V/div)

A V = -1

MAX4122/23/26/27/29LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING)

M A X 4122/29-34

1.2

1.31.51.41.61.71.81.9-40-25-10

95MAX4123

MINIMUM OPERATING VOLTAGE

vs. TEMPERATURE

M A X 4122/29-25

TEMPERATURE (°C)M I N I M U M O P E R A T I N G V O L T A G E (V )

TIME (200ns/div)

V O L T A G E (50m V /d i v )

OUT A V = +1

MAX4122/23/26/27/29SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING)

M A X 4122/29-28

100k

10k FREQUENCY (Hz)

100

1k 0.0400

0.005

0.0100.0150.0200.0250.0300.035MAX4122/23/26/27/29 TOTAL HARMONIC DISTORTION AND NOISE vs. FREQUENCY

T H D & N O I S E (%)

0.1

0.001

4.0

4.4

4.2

5.0

4.84.6MAX4123

TOTAL HARMONIC DISTORTION AND NOISE vs. PEAK-TO-PEAK SIGNAL AMPLITUDE

PEAK-TO-PEAK SIGNAL AMPLITUDE (V)

T H D + N (%)

0.01

TIME (200ns/div)V O L T A G E (50m V /d i v )

OUT

A V = -1

MAX4122/23/26/27/29SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING)

M A X 4122/29-29

TIME (2μs/div)

V O L T A G E (2V /d i v )

OUT

A V = +1

MAX4122/23/26/27/29LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING)

M A X 4122/29-30

Typical Operating Characteristics (continued)

(V CC = +5V, V EE = 0V, V CM = V CC /2, T A = +25°C, unless otherwise noted.)

MAX4122–MAX4129

Single-Supply Rail-to-Rail I/O Op Amps

_______________________________________________________________________________________9

(200mV/div)

TIME (2μs/div)

OUT (2V/div)

A V = +10

MAX4124/25/28

LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING)

M A X 4122/29-33

(200mV/div)

TIME (2μs/div)

OUT (2V/div)

A V = -10

MAX4124/25/28

LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING)

M A X 4122/29-35

Pin Description

M A X 4122–M A X 4129

Single-Supply Rail-to-Rail I/O Op Amps 10______________________________________________________________________________________

Figure 2. Input Protection Circuit

Figure 1a. Reducing Offset Error Due to Bias Current

(Noninverting)Figure 1b. Reducing Offset Error Due to Bias Current (Inverting)

Applications Information

Rail-to-Rail Input Stage

Devices in the MAX4122–MAX4129 family of high-speed amplifiers have rail-to-rail input and output stages designed for low-voltage single-supply opera-tion. The input stage consists of separate NPN and PNP differential stages, which combine to provide an input common-mode range extending 0.2V beyond the supply rails. The PNP stage is active for input voltages close to the negative rail, and the NPN stage is active for input voltages near the positive rail. The input offset voltage is typically below 200μV. The switchover transi-tion region, which occurs near V CC /2, has been extended to minimize the slight degradation in CMRR caused by the mismatch of the input pairs. Their low offset voltage, high bandwidth, and rail-to-rail common-mode range make these op amps excellent choices for precision low-voltage data-acquisition systems.

Since the input stage switches between the NPN and PNP pairs, the input bias current changes polarity as the input voltage passes through the transition region.To reduce the offset error caused by input bias cur-rents flowing through external source impedances,match the effective impedance seen by each input (Figures 1a, 1b). High source impedances, together with the input capacitance, can create a parasitic pole that produces an underdamped signal response.Reducing the input impedance or placing a small (2pF to 10pF) capacitor across the feedback resistor improves the response.

The MAX4122–MAX4129’s inputs are protected from large differential input voltages by 1k ?series resistors and back-to-back triple diodes across the inputs (Figure 2). For differential input voltages less than 1.8V the input resistance is typically 500k ?. For differential input voltages greater than 1.8V the input resistance is approximately 2k ?, and the input bias current is

Rail-to-Rail Output Stage

The minimum output voltage will be within millivolts of ground for single-supply operation where the load is referenced to ground (V EE ). Figure 3 shows the input voltage range and output voltage swing of a MAX4123connected as a voltage follower. With a +3V supply and the load tied to ground, the output swings from

0.00V to 2.90V. The maximum output voltage swing depends on the load, but will be within 150mV of a +3V supply, even with the maximum load (500?to ground).Driving a capacitive load can cause instability in most high-speed op amps, especially those with low quiescent current. The MAX4122–MAX4129 have a high tolerance for capacitive loads. They are stable with capacitive loads up to 500pF. Figure 4 gives the stable operating region for capacitive loads. Figures 5–8 show the response with capacitive loads, and the results of adding an isolation resistor in series with the output (Figure 9).The resistor improves the circuit’s phase margin by iso-lating the load capacitor from the op amp’s output.

MAX4122–MAX4129

Single-Supply Rail-to-Rail I/O Op Amps

______________________________________________________________________________________11

TIME (2μs/div)

OUT

V CC = 3V A V = +1

Figure 3. Rail-to-Rail Input /Output Voltage Range

10,000

100

10k

RESISTIVE LOAD (?)

1000

UNSTABLE REGION

R L TO V EE V OUT = V CC /2

Figure 4. Capacitive-Load Stability

M A X 4122–M A X 4129

Single-Supply Rail-to-Rail I/O Op Amps 12

______________________________________________________________________________________

V O L T A G E (50m V /d i v )

OUT

A V = +1C L = 500pF

Figure 5. MAX4122/23/26/27/29 Small-Signal Transient Response with Capacitive Load IN

TIME (400ns/div)V O L T A G E (50m V /d i v )

OUT

A V = +1C L = 1000pF R S = 39?

Figure 7. MAX4122/23/26/27/29 Transient Response to Capacitive Load with Isolation Resistor

IN V O L T A G E

OUT A V = +10C L = 500pF

(5mV/div)

(50mV/div)

Figure 6. MAX4124/25/28 Small-Signal Transient Response with Capacitive Load

V O L T A G E

OUT A V = +10C L = 1000pF R S = 56?

(5mV/div)(50mV/div)

Figure 8. MAX4124/25/28 Transient Response to Capacitive Load with Isolation Resistor

Figure 9. Capacitive-Load-Driving Circuit Figure 10. Power-Up/Shutdown Test Circuit

MAX4122–MAX4129

Single-Supply Rail-to-Rail I/O Op Amps

______________________________________________________________________________________13

V CC TIME (5μs/div)

V O L T A G E (1V /d i v )

OUT

Figure 11. Power-Up Output Voltage SHDN (1V/div )

TIME (2μs/div)OUT

(0.5V/div)V CC = 2.7V R L = 10k ?

Figure 13. Shutdown Output Voltage V CC (1V/div)

TIME (5μs/div)

I CC

(500μA/div)

Figure 12. Power-Up Supply Current

SHDN (1V/div)

TIME (2μs/div)

I CC

(500μA/div)

V CC = 2.7V

Figure 14. Shutdown Enable/Disable Supply Current

Power-Up and Shutdown Mode

The MAX4122–MAX4129 amplifiers typically settle with-in 1μs after power-up. Using the test circuit of Figure 10, Figures 11 and 12 show the output voltage and supply current on power-up.

The MAX4123, MAX4125, and MAX4127 have a shut-down option. When the shutdown pin (SHDN ) is pulled low, the supply current drops below 25μA per amplifier and the amplifiers are disabled with the outputs in a high-impedance state. Pulling SHDN high or leaving it floating enables the amplifier. In the dual-amplifier MAX4129, the shutdown functions operate indepen-dently. Figures 13 and 14 show the output voltage and supply current responses of the MAX4123 to a shut-down pulse.

Power Supplies and Layout

The MAX4122–MAX4129 operate from a single +2.7V to +6.5V power supply, or from dual supplies of ±1.35V to ±3.25V. For single-supply operation, bypass the power supply with a 0.1μF ceramic capacitor in parallel with at least 1μF. For dual supplies, bypass each sup-ply to ground.

Good layout improves performance by decreasing the amount of stray capacitance at the op amp’s inputs and outputs. To decrease stray capacitance, minimize trace lengths and resistor leads by placing external components close to the op amp’s pins.

M A X 4122–M A X 4129

Single-Supply Rail-to-Rail I/O Op Amps 14______________________________________________________________________________________

Pin Configurations

MAX4122–MAX4129

Single-Supply Rail-to-Rail I/O Op Amps

______________________________________________________________________________________

__________________________________________________________Chip Topographies

OUT2

IN2-

IN2+

0.066"(1.676mm)0.053"(1.346mm)

V CC SHDN1

SHDN2V EE

V CC

OUT1

V CC

IN1- IN1+

V EE

SHDN

V CC

0.055"(1.397mm)

0.036"(0.914mm)

OUT V EE

IN-iN+

V EE

TRANSISTOR COUNT: 170SUBSTRATE CONNECTED TO V EE

TRANSISTOR COUNT: 340SUBSTRATE CONNECTED TO V EE

MAX4123/MAX4125

MAX4127/MAX4128

Ordering Information (continued)

*Dice are specified at T A = +25°C, DC parameters only.

M A X 4122–M A X 4129

Single-Supply Rail-to-Rail I/O Op Amps ________________________________________________________Package Information

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

16____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600?1997 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.