19-6157; Rev 1; 4/12
EVALUATION KIT AVAILABLE
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 pro-
cessing 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 maxi-
mum 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 tem-
perature 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
S
S
S
S
S
S
S
S
1.7V Supply Rail Over the 0°C to +70°C Range
50MHz Bandwidth
Low 12.7nV/√Hz Input Voltage-Noise Density
Low 1.2fA/√Hz Input Current-Noise Density
Low 50µV (max) V
OS
at +25°C
500fA Low Input Bias Current
750µA Quiescent Current per Amplifier
< 1µA Supply Current in Shutdown
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
V
SIG
2.4kI
MAX44280
10kI
3.3nF
ADC
MAX11645
24kI
For related parts and recommended products to use with this part, refer to:
www.maxim-ic.com/MAX44280.related
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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 .................................(V
SS
- 0.3V) to (V
DD
+ 0.3V)
V
DD
to V
SS
...............................................................-0.3V to +6V
SHDN
.......................................................................-0.3V to +6V
Output to Short-Circuit Ground Duration .............................. 10s
Continuous Input Current into Any Pin ............................
Q20mA
Continuous Power Dissipation (T
A
= +70NC)
SC70 (derate 3.1mW/NC above +70NC) ......................245mW
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
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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
SC70
Junction-to-Ambient Thermal Resistance (B
JA
) .... 326.5NC/W
Junction-to-Case Thermal Resistance (B
JC
) .............115NC/W
Thin µDFN (Ultra-Thin LGA)
Junction-to-Ambient Thermal Resistance (B
JA
) ....... 470NC/W
Junction-to-Case Thermal Resistance (B
JC
) ............ 120NC/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.
ELECTRICAL CHARACTERISTICS
(V
DD
= 3.3V, V
SS
= 0V, V
IN+
= V
IN-
= V
DD
/2, RL = 10kI to V
DD
/2, V
SHDN
= V
DD
, T
A
= -40NC to +125NC. Typical values are at
T
A
= +25NC, unless otherwise noted.) (Note 2)
PARAMETER
DC CHARACTERISTICS
Input Voltage Range
V
IN+
V
IN-
Guaranteed by CMRR test
T
A
= +25NC
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Capacitance
Common-Mode Rejection Ratio
Open-Loop Gain
Output Short-Circuit Current
V
OS
V
OS
- TC
T
A
= +25NC
I
B
C
IN
CMRR
A
OL
I
SC
V
CM
= -0.1V to (V
DD
+ 0.1V)
0.4V
P
V
OUT
P
V
DD
- 0.4V, R
OUT
= 10kI
0.4V
P
V
OUT
P
V
DD
- 0.4V, R
OUT
= 600I
0.4V
P
V
OUT
P
V
DD
- 0.4V, R
OUT
= 32I
To V
DD
or V
SS
75
100
91
T
A
= -40NC to +85NC
T
A
= -40NC to +125NC
0.4
90
115
100
80
85
mA
dB
T
A
= -40°C to +125°C after calibration
T
A
= -40°C to +125°C
0.8
0.01
-0.1
10
V
DD
+ 0.1
50
100
500
5
0.5
10
100
pF
dB
pA
FV/NC
FV
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
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Maxim Integrated Products
2
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 3.3V, V
SS
= 0V, V
IN+
= V
IN-
= V
DD
/2, RL = 10kI to V
DD
/2, V
SHDN
= V
DD
, T
A
= -40NC to +125NC. Typical values are at
T
A
= +25NC, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
V
OL
-
V
SS
Output Voltage Swing
V
DD
-
V
OH
AC CHARACTERISTICS
Input Voltage-Noise Density
Input Current-Noise Density
Gain-Bandwidth Product
Minimum Stable Gain
Slew Rate
Settling Time
Capacitive Load
Total Harmonic Distortion
Output Transient Recovery Time
POWER-SUPPLY CHARACTERISTICS
Power-Supply Range
Power-Supply Rejection Ratio
Quiescent Current
Shutdown Supply Current
Shutdown Input Low
Shutdown Input High
Output Leakage Current in
Shutdown
Shutdown Input Bias Current
Shutdown Turn-On Time
Turn-On Time
V
DD
PSRR
I
DD
I
SHDN
V
IL
V
IH
I
SHDN
I
IL
/I
IH
t
SHDN
t
ON
15
10
1.3
100
1
Guaranteed by PSRR
T
A
= 0NC to +70NC
V
CM
= V
DD
/2
1.8
1.7
82
95
750
1200
1
0.7
5.5
5.5
V
dB
µA
µA
V
V
pA
µA
µs
ms
C
LOAD
THD
e
n
i
n
GBWP
A
MIN
SR
V
OUT
= 2V
P-P
, V
DD
= 3.3V, A
V
= 5V/V,
C
L
= 30pF (load), settle to 0.01%
No sustained oscillation, 5V/V
No sustained oscillation, 10V/V
f = 10kHz, V
O
= 2V
P-P
, A
V
= 5V/V,
R
OUT
= 10kI
DV
OUT
= 0.2V, V
DD
= 3.3V
,
A
V
= 5V/V;
R
S
= 20Ω, C
L
= 1nF (load)
f = 10kHz
f = 10kHz
12.7
1.2
50
5
30
0.6
80
500
-110
1
nV/√Hz
fA/√Hz
MHz
V/V
V/Fs
µs
pF
dB
µs
R
OUT
= 10kI
R
OUT
= 600I
R
OUT
= 32I
R
OUT
= 10kI
R
OUT
= 600I
R
OUT
= 32I
400
400
CONDITIONS
MIN
TYP
MAX
20
50
700
10
40
800
mV
UNITS
Note 2:
All devices are 100% production tested at T
A
= +25NC. Temperature limits are guaranteed by design.
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Maxim Integrated Products
3
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Typical Operating Characteristics
(V
DD
= 3.3V, V
SS
= 0V, V
IN+
= V
IN-
= V
DD
/2, R
L
= 10kI to V
DD
/2, V
SHDN
= V
DD
, T
A
= -40NC to +125NC. Typical values are at
T
A
= +25NC, unless otherwise noted. All devices are 100% production tested at T
A
= +25NC. Temperature limits are guaranteed by design.)
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX44280 toc01
INPUT OFFSET VOLTAGE
vs. SUPPLY VOLTAGE
MAX44280 toc02
80
INPUT OFFSET VOLTAGE (µV)
60
40
20
0
-20
-40
-60
-80
-100
INPUT OFFSET VOLTAGE (µV)
40
20
0
-20
-40
-60
-0.5
0
0.5
1.0
1.5
2.0
T
A
= +25°C
T
A
= +125°C
2.5
3.0
T
A
= -40°C
T
A
= -40°C
PERCENT OCCURRENCE (%)
20
15
10
5
0
-15 -10
-5
0
5
T
A
= +25°C
T
A
= +125°C
3.5
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
10
15
20
25
COMMON-MODE VOLTAGE (V)
SUPPLY VOLTAGE (V)
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET DRIFT HISTOGRAM
MAX44280 toc04
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
MAX44280 toc05
OUTPUT VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(V
OL
- V
EE
, V
CC
= 1.8V)
180
OUTPUT VOLTAGE LOW (mV)
160
140
120
100
80
60
40
20
0
T
A
= +125°C
T
A
= -40°C
T
A
= +25°C
MAX44280 toc06
18
16
PERCENT OCCURRENCE (%)
14
12
10
8
6
4
2
0
-2
100
80
INPUT BIAS CURRENT (pA)
60
40
20
0
-20
-40
-60
-80
-100
-0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
T
A
= -40°C
T
A
= +125°C
T
A
= +85°C
T
A
= +25°C
200
-1.5 -1 -0.5
0
0.50 1.00
-1.8 -1.3 -0.8 -0.3 0.25 0.75 1.25
INPUT OFFSET DRIFT (µV/°C)
3.5
0.1
COMMON-MODE VOLTAGE (V)
1
10
OUTPUT SINK CURRENT (mA)
100
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Maxim Integrated Products
4
MAX44280 toc03
60
100
INPUT V
OS
HISTOGRAM
25
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Typical Operating Characteristics (continued)
(V
DD
= 3.3V, V
SS
= 0V, V
IN+
= V
IN-
= V
DD
/2, R
L
= 10kI to V
DD
/2, V
SHDN
= V
DD
, T
A
= -40NC to +125NC. Typical values are at
T
A
= +25NC, unless otherwise noted. All devices are 100% production tested at T
A
= +25NC. Temperature limits are guaranteed by design.)
OUTPUT VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(V
OL
- V
EE
, V
CC
= 3.3V)
MAX44280 toc07
OUTPUT VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(V
OL
- V
EE
, V
CC
= 5V)
MAX44280 toc08
OUTPUT VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(V
CC
- V
OH
, V
CC
= 1.8V)
180
OUTPUT VOLTAGE HIGH (mV)
160
140
120
100
80
60
40
20
0
100
0.1
1
10
OUTPUT SOURCE CURRENT (mA)
100
T
A
= +125°C
T
A
= -40°C
T
A
= +25°C
MAX44280 toc09
200
180
OUTPUT VOLTAGE LOW (mV)
160
140
120
100
80
60
40
20
0
0.1
1
10
OUTPUT SINK CURRENT (mA)
T
A
= -40°C
T
A
= +125°C
T
A
= +25°C
200
180
OUTPUT VOLTAGE LOW (mV)
160
140
120
100
80
60
40
20
T
A
= -40°C
T
A
= +125°C
T
A
= +25°C
200
100
0
0.1
1
10
OUTPUT SINK CURRENT (mA)
OUTPUT VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(V
CC
- V
OH
, V
CC
= 3.3V)
MAX44280 toc10
OUTPUT VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(V
CC
- V
OH
, V
CC
= 5V)
MAX44280 toc11
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX44280 toc12
200
180
OUTPUT VOLTAGE HIGH (mV)
160
140
120
100
80
60
40
20
0
0.1
1
10
OUTPUT SOURCE CURRENT (mA)
T
A
= +125°C
T
A
= -40°C
T
A
= +25°C
200
180
OUTPUT VOLTAGE HIGH (mV)
160
140
120
100
80
60
40
20
0
T
A
= +125°C
T
A
= -40°C
T
A
= +25°C
900
850
SUPPLY CURRENT (µA)
800
750
700
650
600
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
T
A
= -40°C
T
A
= +25°C
T
A
= +125°C
100
0.1
1
10
OUTPUT SOURCE CURRENT (mA)
100
5.5
SUPPLY VOLTAGE (V)
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Maxim Integrated Products
5
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