max44241/max44243/max44246 … · ma44259/ma44260/ma44261/ma44263...

MAX44259/MAX44260/MAX44261/MAX442631.8V、15MHz、低失调、低功耗、

轨到轨I/O运算放大器

典型工作电路

µMAX是Maxim Integrated Products, Inc.的注册商标。

19-6375; Rev 7; 4/15

备有评估板

定购信息在数据资料的最后给出。

相关型号以及配合该器件使用的推荐产品，请参见：www.maximintegrated.com/MAX44241.related。

本文是英文数据资料的译文，文中可能存在翻译上的不准确或错误。如需进一步确认，请在您的设计中参考英文资料。有关价格、供货及订购信息，请联络Maxim亚洲销售中心：10800 852 1249 (北中国区)，10800 152 1249 (南中国区)，或访问Maxim的中文网站：www.maximintegrated.com/cn。

For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAXxxxx.related

概述

MAX44241/MAX44243/MAX44246为36V、超高精度、低噪声、低漂移、单/双/四通道运算放大器，采用专有的斩波稳定和自调零技术，可基本上消除直流失调和漂移。通过对输入失调的连续测量和补偿，在整个工作时间和温度范围内消除漂移及1/f噪声的影响。这些单/双/四通道器件具有轨到轨满摆幅输出，采用2.7V至36V单电源或±1.35V至±18V双电源供电，每通道仅消耗0.42mA电流，输入参考噪声电压只有9nV/√Hz。

IC采用8引脚µMAX®或SO封装，可工作在-40°C至+125°C温度范围。

应用

优势和特性

S 减少噪声灵敏高精度应用 • 低噪声：9nV/√Hz @ 1kHz • 集成EMI滤波器

S 采用增强精度和专有自调零电路，免除了校准的开销 • 超低输入失调VOS：5μV (最大值) • 低失调偏移：20nV/°C (最大值)

S 适合高带宽应用 • 1μs快速建立时间 • 5MHz增益带宽积

S 低静态电流：每通道0.55mA (最大值)

S 宽电源电压范围，用于高压前端 • 2.7V至36V供电范围

S 满摆幅输出电池供电设备

PLC模拟I/O模块

传感器放大器

负载单元放大器

精密仪表

General Description

Applications

Features

S Benefit #1

S Benefit (with no supporting feature needed)

S Benefit with feature implicit in the benefit statement

S [Benefit Example]

MAX44241/MAX44243/MAX44246 36V, Low-Noise, Precision, Single/Quad/Dual Op Amps

19-6375; Rev 7; 4/15

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX44241.related.

Typical Operating Circuit

µMAX is a registered trademark of Maxim Integrated Products, Inc.

EVALUATION KIT AVAILABLE

General Description

The MAX44241/MAX44243/MAX44246 are 36V, ultra-precision, low-noise, low-drift, single/quad/dual opera-tional amplifiers that offer near-zero DC offset and drift through the use of patented chopper stabilized and auto-zeroing techniques. This method constantly mea-sures and compensates the input offset, eliminating drift over time and temperature and the effect of 1/f noise. These single/quad/dual devices feature rail-to-rail out-puts, operate from a single 2.7V to 36V supply or dual ±1.35V to ±18V supplies, and consume only 0.42mA per channel, with only 9nV/√Hz input-referred voltage noise.

The ICs are available in 8-pin FMAXM or SO packages and are rated over the -40NC to +125NC temperature range.

Applications

Benefits and Features

S Reduces Noise-Sensitive Precision Applications

• Low 9nV/√Hz Noise at 1kHz

• Integrated EMI Filter

S Eliminates Cost of Calibration with Increased Accuracy and Patented Auto-Zero Circuitry

• Ultra-Low Input VOS: 5µV (max)

• Low 20nV/°C (max) of Offset Drift

S Suitable for High-Bandwidth Applications• 1µs Fast Settling Time

• 5MHz Gain-Bandwidth Product

S Low 0.55mA Per Channel (max) Quiescent Current

S Wide Supply for High-Voltage Front-Ends• 2.7V to 36V Supply Range

S Rail-to-Rail OutputBattery-Powered Equipment

PLC Analog I/O Modules

Transducer Amplifiers

Load Cell Amplifiers

Precision Instrumentation

15V

15V

15V

3.3V

3V

VDD

MICRO-PROCESSOR

VOUT

50RG

50RGRG

VREFVDD

VSSVIN-

VIN+

C1

BUFFER

BUFFER

½ MAX44246

½ MAX44246

MAX11211

MAX6126

R

R

15V

1.5V

BUFFERR

R

R1

OUTPUT

½ MAX44246

-15V

-15V

-15V

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.For information on other Maxim products, visit Maxim’s website at www.maxim-ic.com.

http://www.maximintegrated.com/MAX44241.related

http://www.maximintegrated.com/MAX44241.related

http://www.maximintegrated.com/cn

1.8V、15MHz、低失调、低功耗、轨到轨I/O运算放大器

MAX44259/MAX44260/MAX44261/MAX44263

2www.maximintegrated.com/cn 2Maxim Integrated


Supply Voltage (VDD to GND) .............................-0.3V to +40VAll Other Pins ................................ (GND - 0.3V) to (VDD + 0.3V)Short-Circuit Duration, OUTA,

OUTB to Either Supply Rail………………………… ............. 1sContinuous Input Current (Any Pin) ..................................20mADifferential Input Current .................................................Q20mADifferential Input Voltage (Note 1) ....................................... .Q6VContinuous Power Dissipation (TA = +70NC) 5-Pin SOT23 (derate 3.9mW/NC above +70NC).......312.6mW 8-Pin FMAX (derate 4.8mW/NC above +70NC) ........387.8mW

8-Pin SO (derate 7.60mW/NC above +70NC)...........606.1mW 14-Pin SO (derate 12.30mW/NC above +70NC).......987.7mW 14-Pin TSSOP (derate 10mW/NC above +70NC) .....796.8mWOperating Temperature Range ........................ -40NC to +125NCJunction Temperature ....................................................+150NCStorage Temperature Range ............................ -65NC to +150NCLead Temperature (soldering,10s) .................................+300NCSoldering Temperature (reflow) ......................................+260NC

ABSOLUTE MAXIMUM RATINGS

Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.

Note 1: The amplifier inputs are connected by internal back-to-back clamp diodes. In order to minimize noise in the input stage, current-limiting resistors are not used. If differential input voltages exceeding ±1V are applied, limit input current to 20mA.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-tion 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.

µMAX Junction-to-Ambient Thermal Resistance (qJA) .....206.3NC/W

Junction-to-Case Thermal Resistance (qJC) ..............42NC/WSO-8

Junction-to-Ambient Thermal Resistance (qJA) ........132NC/W Junction-to-Case Thermal Resistance (qJC) ..............38NC/WSO-14

Junction-to-Ambient Thermal Resistance (qJA) ..........81NC/W Junction-to-Case Thermal Resistance (qJC) ..............32NC/W

SOT23 Junction-to-Ambient Thermal Resistance (qJA) .....255.9NC/W

Junction-to-Case Thermal Resistance (qJC) ..............81NC/WTSSOP

Junction-to-Ambient Thermal Resistance (qJA) .....100.4NC/W Junction-to-Case Thermal Resistance (qJC) ..............30NC/W

PACKAGE THERMAL CHARACTERISTICS (Note 2)

ELECTRICAL CHARACTERISTICS(VDD = 30V, VGND = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values at TA = +25°C.) (Note 3)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range VDD Guaranteed by PSRR 2.7 36 V

Power-Supply Rejection Ratio(Note 4)

PSRRVDD = 2.7V to 36V, TA = +25NC 148 166

dBVDD = 2.7V to 36V, -40NC < TA < +125NC 146

Quiescent Current per Amplifier IDD RL = JTA = +25NC 0.42 0.55

mA-40NC < TA < +125NC 0.60

Power-Up Time tON 20 Fs

DC SPECIFICATIONS

Input Common-Mode Range VCM Guaranteed by CMRR test(VGND - 0.05)

(VDD - 1.5)

V

Common-Mode Rejection Ratio (Note 4)

CMRR VCM = (VGND - 0.05V) to (VDD - 1.5V) 146 166 dB

Input Offset Voltage (Note 4) VOS 1 5 FV



MAX44259/MAX44260/MAX44261/MAX44263



ELECTRICAL CHARACTERISTICS (continued)(VDD = 30V, VGND = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values at TA = +25°C.) (Note 3)

ELECTRICAL CHARACTERISTICS(VDD = 10V, VGND = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values at TA = +25°C.) (Note 3)


Input Offset Voltage Drift (Note 4)

TC VOS 1 20 nV/NC

Input Bias Current (Note 4) IBTA = +25NC 300 600

pA-40NC < TA < +125NC 1250

Input Offset Current (Note 4) IOSTA = +25NC 600 1200

pA-40NC < TA < +125NC 2500

Open-Loop Gain (Note 4) AVOL (VGND + 0.5V) P VOUT P (VDD – 0.5V) 154 168 dB

Output Short-Circuit Current NoncontinuousSinking 40

mASourcing 30

Output Voltage Low VOLTA = +25NC 90 115

mV-40NC < TA < +125NC 180

Output Voltage High VOH

TA = +25NC(VDD - 0.17)

(VDD - 0.13)

V-40NC < TA < +125NC

(VDD - 0.25)

AC SPECIFICATIONS

Input Voltage-Noise Density eN f = 1kHz 9 nV/√Hz

Input Voltage Noise 0.1Hz < f < 10Hz 117 nVP-P

Input Capacitance CIN 2 pF

Gain-Bandwidth Product GBW 5 MHz

Phase Margin PM CL = 20pF 60 Degrees

Slew Rate SR AV = 1V/V, VOUT = 4VP-P 3.8 V/Fs

Capacitive Loading CL No sustained oscillation, AV = 1V/V 300 pF

Total Harmonic Distortion THD

VOUT = 4VP-P,

AV = +1V/V

f = 1kHz -96dB

f = 20kHz -77

VOUT = 2VP-P,

AV = +1V/V

f = 1kHz -91dB

f = 20kHz -76


POWER SUPPLY

Quiescent Current per Amplifier IDD RL = JTA = +25NC 0.42 0.55

mA-40NC < TA < +125NC 0.60

Power-Up Time tON 20 Fs


MAX44259/MAX44260/MAX44261/MAX44263



ELECTRICAL CHARACTERISTICS (continued)(VDD = 10V, VGND = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values at TA = +25°C.) (Note 3)

Note 3: All devices are 100% production tested at TA = +25°C. Temperature limits are guaranteed by design.Note 4: Guaranteed by design.


DC SPECIFICATIONS

Input Common-Mode Range VCM Guaranteed by CMRR test(VGND - 0.05)

(VDD – 1.5) V

Common-Mode Rejection Ratio(Note 4)

CMRR VCM = (VGND - 0.05V) to (VDD - 1.5V) 140 158 dB

Input Offset Voltage (Note 4) VOS 1 5 FV

Input Offset Voltage Drift (Note 4) TC VOS 2.4 20 nV/NC

Input Bias Current (Note 4) IBTA = +25NC 300 600

pA-40NC < TA < +125NC 1100

Input Offset Current (Note 4) IOSTA = +25NC 600 1200

pA-40NC < TA < +125NC 2200

Open-Loop Gain (Note 4) AVOL (VGND + 0.5V) ≤ VOUT ≤ (VDD - 0.5V) 144 164 dB

Output Short-Circuit Current NoncontinuousSinking 40

mASourcing 30

Output Voltage Low VOLTA = +25NC 30 40

mV-40NC < TA < +125NC 60

Output Voltage High VOH

TA = +25NC(VDD - 0.06)

(VDD - 0.05)

V-40NC < TA < +125NC

(VDD - 0.09)

AC SPECIFICATIONS

Input Voltage-Noise Density eN f = 1kHz 9 nV/√Hz

Input Voltage Noise 0.1Hz < f < 10Hz 117 nVP-P

Input Capacitance CIN 2 pF

Gain-Bandwidth Product GBW 5 MHz

Phase Margin PM CL = 20pF 60 Degrees

Slew Rate SR AV = +1V/V, VOUT = 2VP-P, 10% to 90% 3.8 V/µs

Capacitive Loading CL No sustained oscillation, AV = 1V/V 300 pF

Total Harmonic Distortion THDVOUT = 2VP-P, AV = 1V/V

f = 1kHz -92dB

f = 20kHz -76

Settling Time To 0.01%, VOUT = 2V step, AV = 1V/V 1 µs


MAX44259/MAX44260/MAX44261/MAX44263

5www.maximintegrated.com/cn

典型工作特性

5Maxim Integrated


Typical Operating Characteristics

(VDD = 10V, VGND = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 3)

INPUT OFFSET VOLTAGE HISTOGRAM M

AX44

241

toc0

1

OFFSET VOLTAGE (µV)

PERC

ENT

OCCU

RENC

E (%

)

1.00 0.5-0.5-1.0

5

10

15

20

25

30

35

0-1.5 1.5

INPUT OFFSET VOLTAGE DRIFTHISTOGRAM

MAX

4424

1 to

c02

OFFSET VOLTAGE DRIFT (µV/°C)

PERC

ENT

OCCU

RREN

CE (%

)

0.0030 0.002-0.004 -0.002-0.006

5

10

15

20

25

30

35

40

45

00.005

SUPPLY CURRENT PER AMPLIFIER vs. SUPPLY VOLTAGE

MAX

4424

1 to

c03

SUPPLY VOLTAGE (V)

SUPP

LY C

URRE

NT (µ

A)

353020 2510 1550 40

50

100

150

200

250

300

350

400

450

500

VIN = VDD/2NO LOAD

SUPPLY CURRENT PER AMPLIFIER vs. TEMPERATURE

MAX

4424

1 to

c04

TEMPERATURE (°C)

SUPP

LY C

URRE

NT (µ

A)

1007550250-25-50 125

400

410

420

430

440

450

460

470

390

VIN = VDD/2NO LOAD

INPUT BIAS CURRENT vs. VCMvs. TEMPERATURE

MAX

4424

1 to

c07

VCM (V)

INPU

T BI

AS C

URRE

NT (p

A)

875 61 2 3 40

-800-600-400-200

0200400600800

100012001400160018002000

-1000-1 9

IB- (TA = -40°C)

IB+ (TA = +125°C)

IB- (TA = +125°C)

IB+ (TA = -40°C)

IB- (TA = +25°C)

IB+ (TA = +25°C)

INPUT OFFSET VOLTAGE vs. INPUTCOMMON-MODE VOLTAGE

MAX

4424

1 to

c05

VCM (V)

INPU

T OF

FSET

VOL

TAGE

(µV)

87654321

-2

-1

0

1

2

3

-30 9

-300

-200

-100

0

100

200

300

400

500

600

700

-50 0 50 100 150

INPU

T BI

AS C

URRE

NT (p

A)

TEMPERATURE (°C)

INPUT BIAS CURRENTvs. TEMPERATURE

toc08

IB-

IB+

INPUT OFFSET VOLTAGEvs. TEMPERATURE

MAX

4424

1 to

c06

INPU

T OF

FSET

VOL

TAGE

(µV)

5

-5

TEMPERATURE (°C)

1007550250-25-50 125

0

90

100

110

120

140

150

160

170

130

COMMON-MODE REJECTION RATIOvs. TEMPERATURE

MAX

4424

1 to

c09

CMRR

(dB)

180

80

TEMPERATURE (°C)

1007550250-25-50 125



MAX44259/MAX44260/MAX44261/MAX44263



Typical Operating Characteristics (continued)


COMMON-MODE REJECTION RATIOvs. FREQUENCY

MAX

4424

1 to

c10

FREQUENCY (Hz)

MAG

NITU

DE (d

B)

1M100k1k 10k10 1001

0

-20

20

40

60

80

100

120

140

160

-400.1 10M

100mVP-P

90

100

110

120

140

150

160

170

130

POWER-SUPPLY REJECTION RATIOvs. TEMPERATURE

MAX

4424

1 to

c11

PSRR

(dB)

180

80

TEMPERATURE (°C)

1007550250-25-50 125

OPEN-LOOP GAIN vs. FREQUENCY

MAX

4424

1 to

c12

FREQUENCY (Hz)

MAG

NITU

DE (d

B)

1M100k1k 10k10 10010.01 0.1 10M100M

200

-50

0

50

100

150

VIN = 100mVP-P

OUTPUT VOLTAGE LOWvs. TEMPERATURE

MAX

4424

1 to

c15

V OL

(mV)

70

0

TEMPERATURE (°C)

1007550250-25-50 125

10

20

30

40

50

60

OUTPUT VOLTAGE LOWvs. OUTPUT SINK CURRENT

MAX

4424

1 to

c13

OUTPUT SINK CURRENT (mA)

OUTP

UT V

OLTA

GE L

OW (m

V)

86420 10

50

100

150

200

300

350

400

450

250

500

0

OUTPUT VOLTAGE HIGHvs. TEMPERATURE

MAX

4424

1 to

c16

OUTP

UT V

OLTA

GE H

IGH

(V)

9.970

9.930

TEMPERATURE (°C)

1007550250-25-50 125

9.940

9.935

9.945

9.955

9.950

9.965

9.960

OUTPUT VOLTAGE HIGHvs. OUTPUT SOURCE CURRENT

MAX

4424

1 to

c14

OUTPUT SOURCE CURRENT (mA)

OUTP

UT V

OLTA

GE H

IGH

(mV)

8642

50

100

150

200

250

300

350

400

450

00 10

SMALL-SIGNAL GAIN vs. FREQUENCY

MAX

4424

1 to

c17

FREQUENCY (Hz)

MAG

NITU

DE (d

B)

1M100k1k 10k100

2

-2010 100M10M

-18

-16

-14

-12

-10

-8

-6

-4

-2

0

NORMALIZED GAIN,VIN = 100mVP-P

LARGE-SIGNAL GAIN vs. FREQUENCYM

AX44

241

toc1

8

FREQUENCY (Hz)

MAG

NITU

DE (d

B)

10M1M10k 100k1k100

-45

-40

-35

-30

-25

-20

-15

-10

-5

0

5

-5010 100M

NORMALIZED GAIN,VIN = 2VP-P

典型工作特性(续)


MAX44259/MAX44260/MAX44261/MAX44263



7Maxim Integrated




INPUT VOLTAGE 0.1Hz TO 10Hz NOISEMAX44241 toc20

1s /div

200nV/div

SMALL-SIGNAL (100mVP-P)STEP RESPONSE vs. TIME

MAX44241 toc21

1µs/div

VIN50mV/div

VOUT50mV/div

0.01

0.1

1

10

STABILITY vs. CAPACITIVE ANDRESISTIVE LOAD IN PARALLEL

MAX

4424

6 to

c24

CAPACITIVE LOAD (pF)

RESI

STIV

E LO

AD (kI

)

1k 10k

100

0.001100 100k

UNSTABLE

STABLE

POWER-UP TIMEMAX44241 toc25

20µs

VIN = VOUT = 0V

VDD = VSS = 0V VDD = 10V

200mV/div

5V/div

LARGE-SIGNAL (2VP-P)STEP RESPONSE vs. TIME

MAX44241 toc22

1µs/div

VIN1V/div

VOUT1V/div

STABILITY vs. CAPACITIVE LOAD ANDSERIES ISOLATION RESISTANCE

MAX

4424

1 to

c23

CAPACITIVE LOAD (pF)

R ISO

(I)

1k 10k

1

10

100

0.1100 100k

UNSTABLE

STABLE

INPUT VOLTAGE NOISE vs. FREQUENCY

MAX

4424

1 to

c19

FREQUENCY (Hz)

INPU

T VO

LTAG

E NO

ISE

(nV/

√Hz)

10k1k10010

510152025303540455055606570758085

01 100k


MAX44259/MAX44260/MAX44261/MAX44263





TOTAL HARMONIC DISTORTION vs. FREQUENCY

MAX

4424

1 to

c26

FREQUENCY (Hz)

THD

(dB)

10k1k100

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-12010 100k

2VP-P OUTPUT

4VP-P OUTPUT

TOTAL HARMONIC DISTORTIONvs. OUTPUT AMPLITUDE

MAX

4424

1 to

c27

OUTPUT AMPLITUDE (V)

THD

(dB)

987654321

-100

-80

-60

-40

-20

0

-1200 10

CROSSTALK vs. FREQUENCY

MAX

4424

1 to

c28

FREQUENCY (Hz)

CROS

STAL

K (d

B)

10k1k 1M10 100

-120

-100

-80

-60

-40

-20

0

-160

-140

1 10M100k

TOTAL HARMONIC DISTORTION vs. FREQUENCY

MAX

4424

1 to

c29

FREQUENCY (Hz)

THD

(dB)

10k1k100

-110

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

-12010 100k

2VP-P INPUT

VDD = 30V

4VP-P INPUT

EMIRRvs. FREQUENCY (VDD = 3.3V)

MAX

4424

6 to

c30

FREQUENCY (MHz)

EMIR

R (d

B)

1000100101 10,000

10

20

30

40

50

60

70

80

90

100

0



MAX44259/MAX44260/MAX44261/MAX44263



Pin Configurations

INB-

INB+GND

1

2

8

7

VDD

OUTBINA-

INA+

OUTA

3

4

6

5

MAX44246

µMAX/SO

+

IND+

VSSVDD

1

2

14

13

OUTD

IND-INA-

INA+

OUTA

3

4

12

11

INC-

OUTCOUTB

5 10 INC+INB+

INB- 6

7

9

8

+

SO

MAX44243

MAX44241

SOT-23

TOP VIEW

VSS

INA+

1OUTA

2

3 INA-

5 VDD

4

+

14

13

12

11

10

9

8

1

2

3

4

5

6

7

OUTD

IND-

IND+

VSSVDD

INA+

INA-

OUTA

MAX44243

INC+

INC-

OUTCOUTB

INB-

INB+

TSSOP

+

1

2

3

4

8

7

6

5

N.C.

VDD

OUTA

N.C.VSS

INA+

INA-

N.C.

µMAX

+

MAX44241

引脚配置


MAX44259/MAX44260/MAX44261/MAX44263


引脚说明

引脚

名称功能MAX44241 MAX44243 MAX44246

SOT23-5 µMAX-8 SO-14 TSSOP-14 SO-8 µMAX-8

16 11 11 OUTA 通道A输出。

24 11 11 44 VSS 负电源电压。

33 33 33 INA+ 通道A输入正端。

42 22 22 INA- 通道A输入负端。

57 44 88 VDD 正电源电压。

— — 55 55 INB+ 通道B输入正端。

— — 66 66 INB- 通道B输入负端。

— — 77 77 OUTB 通道B输出。

— — 88 —— OUTC 通道C输出。

— — 99 —— INC- 通道C输入负端。

—— 10 10 —— INC+ 通道C输入正端。

—— 12 12 —— IND+ 通道D输入正端。

—— 13 13 —— IND- 通道D输入负端。

—— 14 14 —— OUTD 通道D输出。

— 1, 5, 8— — —— N.C. 不连接。无内部连接。


MAX44259/MAX44260/MAX44261/MAX44263


详细说明

MAX44241/MAX44243/MAX44246为高精度放大器，最大输入失调低至5μV以下，并具有超低闪烁噪声。器件采用专有的自调零和斩波技术，获得优异的特性指标。自调零与斩波技术相结合，确保这些放大器在保持零漂放大器优势的同时，具有低噪声、最小斩波毛刺以及宽频带等特性。电源纹波/毛刺以及共模电压变化引起的失调电压被修正掉，得到优异的PSRR和CMRR指标。

噪声抑制任何有源器件都存在固有的闪烁噪声，闪烁噪声与频率成反比。MOSFET氧化物在氧化硅表面低频吸收、释放电荷，产生闪烁噪声，也称为1/f噪声。MAX44241/MAX44243/MAX44246从内部消除了1/f噪声，非常适合对直流或亚Hz噪声要求苛刻的场所。1/f噪声表现为慢变化的失调电压，可以利用斩波技术消除掉。

电磁干扰(EMI)噪声具有较高频率，通常会造成电气设备故障或降低性能。IC输入端提供EMI滤波器，以避免输出信号受射频干扰的影响。EMI滤波器由无源器件组成，对高频噪声呈现较高阻抗。

应用信息

ADC 缓冲放大器MAX44241/MAX44243/MAX44246具有低的输入失调电压和噪声，快速建立时间，很适合用于做ADC的缓冲器。电子秤等设备通常在ADC之前需要一级低噪声、高电压放大器。典型工作电路所示为负载单元和放大器驱动电路，它们采用同一±10V电源供电，配合MAX11211 18位Σ-Δ ADC

工作。负载单元输出电压变化非常小，利用高压驱动激励源可以为ADC输入测量产生较宽的动态范围。

MAX11211 ADC采用2.7V至3.6V单路模拟电源供电，提供18位无噪声分辨率，功耗只有0.86mW。MAX11211具有大于100dB的50Hz、60Hz抑制，是Maxim 16位、18位、20位和24位Σ-Δ ADC系列产品的其中一员，在提供超高精度的同时，保持极低功耗(小于1mW)。

MAX44241/MAX44243/MAX44246的低输入失调电压和低噪声特性，作为MAX11211的前级放大电路，不会损失ADC的任何动态范围。参见典型工作电路。

高精度低边电流检测 IC提供超低失调电压和温漂，理想用于高精度电流检测。图1所示电路中，IC配置为低边电流检测。该电路产生高精度输出电压：VOUT = ILOAD x RSENSE x (1 + R2/R1)。

图1. 低边电流检测

VSUPPLY

OUT

R2

R1

ILOAD

RSENSE

MAX44246


MAX44259/MAX44260/MAX44261/MAX44263


布板指南

MAX44241/MAX44243/MAX44246具有超低失调电压和噪声，需遵循以下电路板布局原则，以优化系统性能。

须避免两种不同金属形成的结产生温度梯度，PCB上最常见的金属结是引脚与电路板引线的焊接点。不同的金属形成本地热电偶，由于焊接点的热电系数(Seebeck系数)，温度变化时将在电路板上形成额外的失调。为了使热电系数降至最小，放大器应该尽可能远离热源。调整热阻使得接点两侧的温度相同，最好在输入信号通路保持匹配，使热电偶结的类型和数量相同。例如，考虑使用0Ω哑电阻，使其与热电偶同向，从而与信号通道的实际电阻相抵消。建议铺设大面积的PCB地层，确保板子均匀散热，降低潜在的热点效应的影响。

定购信息

芯片信息

PROCESS: BiCMOS

封装信息

如需最近的封装外形信息和焊盘布局(占位面积)，请查询www.maximintegrated.com/cn/design/packaging。请注意，封装编码中的“+”、“#”或“-”仅表示RoHS状态。封装图中可能包含不同的尾缀字符，但封装图只与封装有关，与RoHS状态无关。

封装类型封装编码外形编号焊盘布局编号

5 SOT23 U5+1 21-0057 90-0174

8 SO S8+4 21-0041 90-0096

8 FMAX U8+1 21-0036 90-0092

14 SO S14M+4 21-0041 90-0112

14 TSSOP U14M+1 21-0066 90-0113

+表示无铅(Pb)/符合RoHS标准的封装。

器件温度范围引脚-封装顶标

MAX44241AUA+ -40NC至+125NC 8 FMAX —

MAX44241AUK+ -40NC至+125NC 5 SOT23 AFMQ

MAX44243ASD+ -40NC至+125NC 14 SO —

MAX44243AUD+ -40NC至+125NC 14 TSSOP —

MAX44246ASA+ -40NC至+125NC 8 SO —

MAX44246AUA+ -40NC至+125NC 8 FMAX —

http://www.maximintegrated.com/cn/design/packaging

http://www.maximintegrated.com/cn/design/packaging

http://http://pdfserv.maximintegrated.com/package_dwgs/21-0057.PDF

http://http://pdfserv.maximintegrated.com/land_patterns/90-0174.PDF










MAX44259/MAX44260/MAX44261/MAX44263

修订历史

Maxim不对Maxim产品以外的任何电路使用负责，也不提供其专利许可。Maxim保留在任何时间、没有任何通报的前提下修改产品资料和规格的权利。电气特性表中列出的参数值(最小值和最大值)均经过设计验证，数据资料其它章节引用的参数值供设计人员参考。Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-10 00 13© 2015 Maxim Integrated Maxim标志和Maxim Integrated是Maxim Integrated Products, Inc.的商标。

修订号修订日期说明修改页

0 7/12 最初版本。 —

1 9/12 修改了电气特性和典型工作特性。 1, 2, 3, 5

2 2/13 修订典型工作特性。 8

3 5/13 更新概述、典型应用电路和引脚说明。 1, 9

4 9/13 数据资料中增加MAX44241/MAX44243。修订典型工作电路。 1–13

5 1/14 修订Electrical Characteristics和典型工作特性。 2, 5

6 12/14 修订优势和特性部分。 1

7 4/15 修订定购信息。 13

max44241/max44243/max44246 … · ma44259/ma44260/ma44261/ma44263...

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