MAXIM MAX44280 Technical data

EVALUATION KIT AVAILABLE

19-6157; Rev 1; 4/12

MAX44280

1.8V, 50MHz, Low-Offset,

Low-Power, Rail-to-Rail I/O Op Amp

General Description

The MAX44280 offers a unique combination of high speed, precision, low noise, and low-voltage operation making it ideally suited for a large number of signal processing functions such as filtering and amplification of signals in portable and industrial equipment.

The amplifier features an input offset of less than 50FV and a high-gain bandwidth product of 50MHz while maintaining a low 1.8V supply rail. The device is internally compensated for gains of 5V/V or greater. The device’s rail-to-rail input/outputs and low noise guarantee maximum dynamic range in demanding applications such as 12- to 16-bit SAR ADC drivers. Unlike traditional rail-to-rail input structures, input crossover distortion is absent due to an optimized input stage with an ultra-quiet charge pump.

The MAX44280 includes a fast-power-on shutdown mode for further power savings.

The MAX44280 operates from a supply range of 1.8V to

5.5V over the -40NC to +125NC temperature range and can operate down to 1.7V over the 0NC to +70NC temperature range. The MAX44280 is available in a small, 6-pin SC70 package and is also available in a 1mm x

1.5mm thin µDFN (ultra-thin LGA) package.

Ordering Information appears at end of data sheet.

Features

S Low 1.8V Supply Rail Over the -40°C to +125°C

Range

S 1.7V Supply Rail Over the 0°C to +70°C Range S 50MHz Bandwidth S Low 12.7nV/√Hz Input Voltage-Noise Density S Low 1.2fA/√Hz Input Current-Noise Density

S Low 50µV (max) VOS at +25°C S 500fA Low Input Bias Current S 750µA Quiescent Current per Amplifier S < 1µA Supply Current in Shutdown S Small, 2mm x 2mm SC70 and 1mm x 1.5mm Thin

µDFN Packages

S Low 110dB Total Harmonic Distortion

S 5V/V Minimum Stable Gain

Applications

Notebooks

3G/4G Handsets

Portable Media Players

Portable Medical Instruments

Battery-Operated Devices

Analog-to-Digital Converter Buffers

Transimpedance Amplifiers

General-Purpose Signal Processing

Typical Application Circuit

+3.3V

24kI

MAX44280

10kI

3.3nF

ADC

MAX11645

V

SIG

2.4kI

For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX44280.related

�� Maxim Integrated Products 1

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

MAX44280

1.8V, 50MHz, Low-Offset,

Low-Power, Rail-to-Rail I/O Op Amp

ABSOLUTE MAXIMUM RATINGS

IN+, IN-, OUT .................................(VSS - 0.3V) to (VDD + 0.3V)

V

to VSS ............................................................... -0.3V to +6V

DD

SHDN .......................................................................-0.3V to +6V

Output to Short-Circuit Ground Duration .............................. 10s

Continuous Input Current into Any Pin ............................ Q20mA

Continuous Power Dissipation (TA = +70NC)

SC70 (derate 3.1mW/NC above +70NC) ......................245mW

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.

PACKAGE THERMAL CHARACTERISTICS (Note 1)

SC70

Junction-to-Ambient Thermal Resistance (BJA) .... 326.5NC/W

Junction-to-Case Thermal Resistance (BJC) .............115NC/W

Note 1: 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.maxim-ic.com/thermal-tutorial.

Thin µDFN (Ultra-Thin LGA)

(derate 2.1mW/NC above +70NC) .............................110.2mW

Operating Temperature Range ........................ -40NC to +125NC

Junction Temperature .....................................................+150NC

Lead Temperature (soldering, 10s) ................................+300NC

Soldering Temperature (reflow) ......................................+260NC

Thin µDFN (Ultra-Thin LGA)

Junction-to-Ambient Thermal Resistance (BJA) ....... 470NC/W

Junction-to-Case Thermal Resistance (BJC) ............ 120NC/W

ELECTRICAL CHARACTERISTICS

(VDD = 3.3V, VSS = 0V, V TA = +25NC, unless otherwise noted.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DC CHARACTERISTICS

Input Voltage Range V

Input Offset Voltage V

Input Offset Voltage Drift VOS - TC 0.8 5

Input Bias Current I

Input Capacitance C

Common-Mode Rejection Ratio CMRR VCM = -0.1V to (VDD + 0.1V) 75 90 dB

Open-Loop Gain A

Output Short-Circuit Current I

IN+

= V

= VDD/2, RL = 10kI to VDD/2, V

IN-

IN+ VIN-

OS

B

IN

OL

SC

Guaranteed by CMRR test -0.1

TA = +25NC

TA = -40°C to +125°C after calibration

TA = -40°C to +125°C

TA = +25NC

TA = -40NC to +85NC

TA = -40NC to +125NC

0.4V P V

To VDD or V

P VDD - 0.4V, R

OUT

P VDD - 0.4V, R

OUT

P VDD - 0.4V, R

OUT

SS

= VDD, TA = -40NC to +125NC. Typical values are at

SHDN

VDD

+ 0.1

10 50

100

500

0.01 0.5

10

100

0.4 pF

OUT

= 10kI

= 600I

= 32I

100 115

91 100

80

85 mA

V

FV

FV/NC

pA

dB

�� Maxim Integrated Products 2

MAX44280

1.8V, 50MHz, Low-Offset,

Low-Power, Rail-to-Rail I/O Op Amp

ELECTRICAL CHARACTERISTICS (continued)

(VDD = 3.3V, VSS = 0V, V TA = +25NC, unless otherwise noted.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Output Voltage Swing

AC CHARACTERISTICS

Input Voltage-Noise Density e

Input Current-Noise Density i

Gain-Bandwidth Product GBWP 50 MHz

Minimum Stable Gain A

Slew Rate SR 30

Settling Time

Capacitive Load C

Total Harmonic Distortion THD

Output Transient Recovery Time

POWER-SUPPLY CHARACTERISTICS

Power-Supply Range V

Power-Supply Rejection Ratio PSRR VCM = VDD/2 82 95 dB

Quiescent Current I

Shutdown Supply Current

Shutdown Input Low V

Shutdown Input High V

Output Leakage Current in Shutdown

Shutdown Input Bias Current IIL/I

Shutdown Turn-On Time

Turn-On Time t

Note 2: All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.

IN+

= V

= VDD/2, RL = 10kI to VDD/2, V

IN-

R

= 10kI

VOL -

V

SS

VDD -

V

OH

n

MIN

LOAD

DD

I

SHDN

IL

IH

I

SHDN

t

SHDN

ON

IH

OUT

R

= 600I

OUT

R

= 32I

OUT

R

= 10kI

OUT

R

= 600I

OUT

R

= 32I

OUT

f = 10kHz 12.7

f = 10kHz 1.2

V

= 2V

OUT

CL = 30pF (load), settle to 0.01%

No sustained oscillation, 5V/V 80

No sustained oscillation, 10V/V 500

f = 10kHz, VO = 2V R

= 10kI

OUT

DV

OUT

RS = 20Ω, CL = 1nF (load)

Guaranteed by PSRR 1.8 5.5

TA = 0NC to +70NC

= VDD, TA = -40NC to +125NC. Typical values are at

SHDN

, VDD = 3.3V, AV = 5V/V,

P-P

, AV = 5V/V,

P-P

= 0.2V, VDD = 3.3V, AV = 5V/V;

20

50

400 700

10

40

400 800

nV/√Hz

fA/√Hz

5 V/V

0.6 µs

-110 dB

1 µs

1.7 5.5

750 1200 µA

1 µA

0.7 V

1.3 V

100 pA

1 µA

15 µs

10 ms

mV

V/Fs

pF

V

�� Maxim Integrated Products 3

MAX44280

1.8V, 50MHz, Low-Offset,

Low-Power, Rail-to-Rail I/O Op Amp

Typical Operating Characteristics

(VDD = 3.3V, VSS = 0V, V

IN+

= V

= VDD/2, RL = 10kI to VDD/2, V

IN-

= VDD, TA = -40NC to +125NC. Typical values are at

SHDN

TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)

INPUT OFFSET VOLTAGE

vs. COMMON-MODE VOLTAGE

60

40

20

0

-20

INPUT OFFSET VOLTAGE (µV)

TA = +25°C

-40

-60

-0.5 3.5 COMMON-MODE VOLTAGE (V)

TA = -40°C

TA = +125°C

100

80

MAX44280 toc01

60

40

20

0

-20

-40

INPUT OFFSET VOLTAGE (µV)

-60

-80

3.02.52.01.51.00.50

-100

INPUT OFFSET VOLTAGE

vs. SUPPLY VOLTAGE

TA = -40°C

TA = +25°C

TA = +125°C

1.5 5.5 SUPPLY VOLTAGE (V)

5.04.53.5 4.02.5 3.02.0

25

MAX44280 toc02

20

15

10

PERCENT OCCURRENCE (%)

5

0

-15 -10 -5 051015 20 25

INPUT VOS HISTOGRAM

INPUT OFFSET VOLTAGE (µV)

OUTPUT VOLTAGE LOW

INPUT OFFSET DRIFT HISTOGRAM

18

16

14

12

10

8

6

PERCENT OCCURRENCE (%)

4

2

0

-2

-1.5

-1.8

-1.3-1-0.8

INPUT OFFSET DRIFT (µV/°C)

-0.5

-0.300.25

0.50

0.75

1.00

1.25

100

80

MAX44280 toc04

60

40

20

0

-20

-40

INPUT BIAS CURRENT (pA)

-60

-80

-100

-0.5 3.5

INPUT BIAS CURRENT

vs. COMMON-MODE VOLTAGE

TA = +25°C

TA = +85°CTA = -40°C

TA = +125°C

COMMON-MODE VOLTAGE (V)

200

180

MAX44280 toc05

160

140

120

100

80

60

OUTPUT VOLTAGE LOW (mV)

40

20

3.02.51.5 2.00.5 1.00

vs. OUTPUT SINK CURRENT

(VOL - VEE, VCC = 1.8V)

TA = +25°C

TA = +125°C

TA = -40°C

0

0.1 100 OUTPUT SINK CURRENT (mA)

101

MAX44280 toc03

MAX44280 toc06

�� Maxim Integrated Products 4

MAX44280

1.8V, 50MHz, Low-Offset,

Low-Power, Rail-to-Rail I/O Op Amp

Typical Operating Characteristics (continued)

(VDD = 3.3V, VSS = 0V, V

IN+

= V

= VDD/2, RL = 10kI to VDD/2, V

IN-

= VDD, TA = -40NC to +125NC. Typical values are at

SHDN

TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)

OUTPUT VOLTAGE LOW

vs. OUTPUT SINK CURRENT

(VOL - VEE, VCC = 3.3V)

200

180

160

140

120

100

80

60

OUTPUT VOLTAGE LOW (mV)

40

20

0

0.1 100

TA = +25°C

TA = +125°C

TA = -40°C

101

OUTPUT SINK CURRENT (mA)

OUTPUT VOLTAGE HIGH

vs. OUTPUT SOURCE CURRENT

(VCC - VOH, VCC = 3.3V)

200

180

160

140

120

100

80

60

OUTPUT VOLTAGE HIGH (mV)

40

20

0

0.1 100 OUTPUT SOURCE CURRENT (mA)

TA = +25°C

TA = +125°C

101

TA = -40°C

200

180

MAX44280 toc07

160

140

120

100

80

60

OUTPUT VOLTAGE LOW (mV)

40

20

0

200

180

MAX44280 toc10

160

140

120

100

80

60

OUTPUT VOLTAGE HIGH (mV)

40

20

0

OUTPUT VOLTAGE LOW

vs. OUTPUT SINK CURRENT

(VOL - VEE, VCC = 5V)

TA = +25°C

TA = +125°C

TA = -40°C

0.1 100 OUTPUT SINK CURRENT (mA)

101

OUTPUT VOLTAGE HIGH

vs. OUTPUT SOURCE CURRENT

(VCC - VOH, VCC = 5V)

TA = +25°C

TA = +125°C

TA = -40°C

0.1 100

OUTPUT SOURCE CURRENT (mA)

101

200

180

160

MAX44280 toc08

140

120

100

80

TA = +125°C

60

OUTPUT VOLTAGE HIGH (mV)

40

20

0

0.1 100

SUPPLY CURRENT vs. SUPPLY VOLTAGE

900

850

MAX44280 toc11

800

750

700

SUPPLY CURRENT (µA)

650

600

1.5 5.5

OUTPUT VOLTAGE HIGH

vs. OUTPUT SOURCE CURRENT

(VCC - VOH, VCC = 1.8V)

TA = +25°C

TA = -40°C

101

OUTPUT SOURCE CURRENT (mA)

TA = +25°C

TA = +125°C

TA = -40°C

5.04.54.03.53.02.52.0

SUPPLY VOLTAGE (V)

MAX44280 toc09

MAX44280 toc12

�� Maxim Integrated Products 5