MAXIM MAX4253

19-1295; Rev 8; 10/11
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
The MAX4249–MAX4257 low-noise, low-distortion operational amplifiers offer rail-to-rail outputs and singlesupply operation down to 2.4V. They draw 400µA of
quiescent supply current per amplifier while featuring
ultra-low distortion (0.0002% THD), as well as low input
voltage-noise density (7.9nV/√Hz) and low input
current-noise density (0.5fA/√Hz). These features make
the devices an ideal choice for portable/battery-powered
applications that require low distortion and/or low noise.
For additional power conservation, the MAX4249/
MAX4251/MAX4253/MAX4256 offer a low-power shutdown mode that reduces supply current to 0.5µA and
puts the amplifiers’ outputs into a high-impedance
state. The MAX4249-MAX4257’s outputs swing rail-torail and their input common-mode voltage range
includes ground. The MAX4250–MAX4254 are unitygain stable with a gain-bandwidth product of 3MHz.
The MAX4249/MAX4255/MAX4256/MAX4257 are internally compensated for gains of 10V/V or greater with a
gain-bandwidth product of 22MHz. The single MAX4250/
MAX4255 are available in space-saving 5-pin SOT23
packages. The MAX4252 is available in an 8-bump chipscale package (UCSP™) and the MAX4253 is available in
a 10-bump UCSP. The MAX4250AAUK comes in a 5-pin
SOT23 package and is specified for operation over the
automotive (-40°C to +125°C) temperature range.
Applications
Wireless Communications Devices
PA Control
Portable/Battery-Powered Equipment
Medical Instrumentation
ADC Buffers
Features
o Available in Space-Saving UCSP, SOT23, and
µMAX® Packages
o Low Distortion: 0.0002% THD (1kΩ load)
o 400µA Quiescent Supply Current per Amplifier
o Single-Supply Operation from 2.4V to 5.5V
o Input Common-Mode Voltage Range Includes
Ground
o Outputs Swing Within 8mV of Rails with a 10kΩ
Load
o 3MHz GBW Product, Unity-Gain Stable
(MAX4250–MAX4254)
22MHz GBW Product, Stable with AV ≥ 10V/V
(MAX4249/MAX4255/MAX4256/MAX4257)
o Excellent DC Characteristics
VOS = 70µV
IBIAS = 1pA
Large-Signal Voltage Gain = 116dB
o Low-Power Shutdown Mode
Reduces Supply Current to 0.5µA
Places Outputs in a High-Impedance State
o 400pF Capacitive-Load Handling Capability
Ordering Information
PART
MAX4249ESD+
TEMP RANGE
PINPACKAGE
-40°C to +85°C
14 SO
TOP
MARK
—
MAX4249EUB+
-40°C to +85°C
10 µMAX
—
MAX4250EUK+T
-40°C to +85°C
5 SOT23
ACCI
MAX4250AAUK+T
-40°C to +125°C
5 SOT23
AEYJ
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Digital Scales/Strain Gauges
Pin/Bump Configurations
TOP VIEW
(BUMPS ON BOTTOM)
1
2
A
OUTA
VDD
B
INA-
3
A1
A2
A3
A4
OUTB
OUTB
INB-
INB+
SHDNB
INB-
VDD
C1
C2
C3
C4
INB+
OUTA
INA-
INA+
SHDNA
B4
B1
C
INA+
MAX4252
VSS
UCSP
MAX4253
VSS
UCSP
Pin/Bump Configurations continued at end of data sheet.
UCSP is a trademark and µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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.
MAX4249–MAX4257
General Description
MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (VDD to VSS) ......................+6.0V to -0.3V
Analog Input Voltage (IN_+, IN_-)....(VDD + 0.3V) to (VSS - 0.3V)
SHDN Input Voltage ......................................6.0V to (VSS - 0.3V)
Output Short-Circuit Duration to Either Supply ..........Continuous
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW
8-Bump UCSP (derate 4.7mW/°C above +70°C)........379mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) ............362mW
8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
10-Bump UCSP (derate 6.1mW/°C above +70°C) ......484mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW
Operating Temperature Range ...........................-40°C to +85°C
MAX4250AAUK .............................................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
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.
ELECTRICAL CHARACTERISTICS
(VDD = 5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected to VDD/2, SHDN = VDD, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.) (Notes 2, 3)
PARAMETER
Supply Voltage Range
SYMBOL
VDD
CONDITIONS
(Note 4)
MIN
2.4
VDD = 3V
Quiescent Supply Current Per
Amplifier
IQ
Normal
mode
E temperature
VDD = 5V
420
MAX4250AAUK
Input Offset Voltage Tempco
TCVOS
E temperature
IB
Differential Input Resistance
Input Common-Mode Voltage
Range
Common-Mode Rejection Ratio
2
IOS
CMRR
575
0.5
1.5
±0.75
±1.85
0.3
(Note 6)
0.1
(Note 6)
TA = -40°C to +125°C
1500
10
TA = -40°C to +125°C
100
1000
Guaranteed by
CMRR test
VSS - 0.2V ≤ VCM ≤
VDD - 1.1V
VDD -1.1
MAX4250AAUK
0
VDD -1.1
E temperature
70
MAX4250AAUK
68
_______________________________________________________________________________________
pA
GΩ
-0.2
115
pA
1
TA = -40°C to +85°C
E temperature
mV
1
50
0.1
µA
µV/°C
TA = -40°C to +85°C
RIN
VCM
V
655
±0.07
TA = +25°C
Input Offset Current
5.5
420
MAX4250AAUK
TA = +25°C
Input Bias Current
UNITS
675
Shutdown mode (SHDN = VSS) (Note 2)
VOS
MAX
400
VDD = 5V, UCSP only
Input Offset Voltage (Note 5)
TYP
V
dB
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
(VDD = 5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected to VDD/2, SHDN = VDD, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.) (Notes 2, 3)
PARAMETER
Power-Supply Rejection Ratio
SYMBOL
PSRR
CONDITIONS
VDD – 2.4V to 5.5V
RL = 10kΩ to VDD/2;
VOUT = 25mV to VDD
– 4.97V
Large-Signal Voltage Gain
Output Voltage Swing
Output Voltage Swing
AV
VOUT
VOUT
MIN
TYP
E temperature
75
100
MAX4250AAUK
72
E temperature
80
MAX4250AAUK
77
E temperature
80
MAX4250AAUK
77
Output Leakage Current
|VIN+ - VIN-| ≥ 10mV;
RL = 10kΩ to VDD/2
|VIN+ - VIN-| ≥ 10mV,
RL = 1kΩ to VDD/2
VDD - VOH
VOL - VSS
VDD - VOH
116
112
8
7
A
(Note 2)
SHDN Logic High
VIH
(Note 2)
E
77
A
47
A
SHDN = VSS = VDD (Note 2)
Slew Rate
SR
Peak-to-Peak Input-Noise
Voltage
enP-P
Input Voltage-Noise Density
en
Input Current-Noise Density
in
mV
100
125
0.001
mA
1.0
µA
0.2 X VDD
V
0.8 X VDD
V
0.5
11
GBW
mV
200
225
E
Input Capacitance
Gain-Bandwidth Product
25
30
20
25
Shutdown mode (SHDN = VSS),
VOUT = VSS to VDD (Note 2)
VIL
IIL/IIH
dB
68
SHDN Logic Low
SHDN Input Current
E
A
E
ISC
ILEAK
UNITS
dB
RL = 1kΩ to VDD/2;
VOUT = 150V to VDD
– 4.75V
VOL - VSS
Output Short-Circuit Current
MAX
MAX4250–MAX4254
3
MAX4249/MAX4255/MAX4256/MAX4257
22
MAX4250–MAX4254
0.3
MAX4249/MAX4255/MAX4256/MAX4257
2.1
f = 0.1Hz to 10Hz
760
1.5
µA
pF
MHz
V/µs
f = 10Hz
27
f = 1kHz
8.9
f = 30kHz
7.9
f = 1kHz
0.5
nVP-P
nV/√Hz
fA/√Hz
_______________________________________________________________________________________
3
MAX4249–MAX4257
ELECTRICAL CHARACTERISTICS (continued)
MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected to VDD/2, SHDN = VDD, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.) (Notes 2, 3)
PARAMETER
Total Harmonic Distortion Plus
Noise
SYMBOL
MAX4250–MAX4254
AV = 1V/V, VOUT = 2VP-P,
RL = 1kΩ to GND
(Note 7)
Phase Margin
Delay Time to Enable
Power-Up Delay Time
TYP
f = 1kHz
0.0004
f = 20kHz
0.006
f = 1kHz
0.0012
f = 20kHz
0.007
MAX
GM
ΦM
No sustained oscillations
400
MAX4250–MAX4254, AV = 1V/V
10
MAX4249/MAX4255/MAX4256/MAX4257,
AV = 10V/V
tEN
tPU
dB
74
MAX4249/MAX4255/MAX4256/MAX4257,
AV = 10V/V
68
IVDD = 5% of
normal
operation
VOUT = 2.5V,
VOUT settles to
0.1%
Degrees
MAX4250–MAX4254
6.7
MAX4249/MAX4255/
MAX4256/MAX4257
1.6
MAX4251/MAX4253
0.8
MAX4249/MAX4256
1.2
MAX4251/MAX4253
8
MAX4249/MAX4256
3.5
µs
µs
µs
VDD = 0 to 5V step, VOUT stable to 0.1%
6
Note 2: SHDN is available on the MAX4249/MAX4251/MAX4253/MAX4256 only.
Note 3: All device specifications are 100% tested at TA = +25°C. Limits over temperature are guaranteed by design.
Note 4: Guaranteed by the PSRR test.
Note 5: Offset voltage prior to reflow on the UCSP.
Note 6: Guaranteed by design.
Note 7: Lowpass-filter bandwidth is 22kHz for f = 1kHz and 80kHz for f = 20kHz. Noise floor of test equipment = 10nV/√Hz.
4
pF
12.5
MAX4250–MAX4254, AV = 1V/V
To 0.01%, VOUT
= 2V step
tSH
UNITS
%
MAX4249/MAX4255/
MAX4256/MAX4257
AV = 1V/V, VOUT = 2VP-P,
RL = 1kΩ to GND (Note 7)
Settling Time
Delay Time to Shutdown
MIN
THD+N
Capacitive-Load Stability
Gain Margin
CONDITIONS
_______________________________________________________________________________________
µs
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
(VDD = 5V, VSS = 0V, VCM = VOUT = VDD/2, input noise floor of test equipment =10nV/√Hz for all distortion measurements,
TA = +25°C, unless otherwise noted.)
OFFSET VOLTAGE
vs. TEMPERATURE
100
20
50
0
-50
15
-100
10
-150
0
-250
-40
-20
VOS (µV)
OUTPUT VOLTAGE
vs. OUTPUT LOAD CURRENT
0.4
0.3
VOL
40
0.2
4
5
6
7
8
9
RL = 1kΩ
0.05
RL = 20kΩ
110
0.01
RL = 10kΩ
RL = 100kΩ
0
20
40
60
-40
80
140
130
120
AV (dB)
RL = 2kΩ
90
110
RL = 20kΩ
70
VDD = 3V
RL REFERENCED TO GND
RL = 200kΩ
150
200
VOUT SWING FROM EITHER SUPPLY (mV)
250
40
60
80
140
RL = 200kΩ
130
120
110
RL = 20kΩ
100
RL = 2kΩ
80
70
VDD = 3V
RL REFERENCED TO GND
60
100
20
90
RL = 2kΩ
70
50
0
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
80
50
-20
TEMPERATURE (°C)
100
90
80
0
RL = 10kΩ
RL = 100kΩ
0
-20
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
100
60
0.03
0.02
MAX4249-57 TOC08
120
RL = 1kΩ
TEMPERATURE (°C)
MAX4249-57 TOC07
130
4.5
0.04
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
RL = 200kΩ
3.5
0.04
0.06
OUTPUT LOAD CURRENT (mA)
140
2.5
0.05
0.07
-40
10
1.5
0.06
AV (dB)
3
0.5
OUTPUT VOLTAGE SWING (VOL)
vs. TEMPERATURE
0
2
0
OUTPUT VOLTAGE SWING (VOH)
vs. TEMPERATURE
0.01
1
VDD = 5V
INPUT COMMON-MODE VOLTAGE (V)
0.02
0
VDD = 3V
50
-50
-0.5
80
0.03
0
100
TEMPERATURE (°C)
0.08
0.1
AV (dB)
60
0.09
VDD - VOH (V)
OUTPUT VOLTAGE (V)
VDD - VOH
20
VOL (V)
VDD = 3V OR 5V
VDIFF = ±10mV
0.5
0.10
MAX4249-57 TOC04
0.6
0
MAX4249-57 TOC05
-200
-95
-75
-55
-35
-13
7
28
49
69
90
110
131
152
172
192
5
150
MAX4249-57 TOC09
25
MAX4249-57 TOC03
150
200
INPUT OFFSET VOLTAGE (µV)
VCM = 0
200
VOS (µV)
NUMBER OF UNITS
30
MAX4249-57 TOC02
400 UNITS
VCM = 0
TA = +25°C
35
250
MAX4249-57 TOC01
40
INPUT OFFSET VOLTAGE
vs. INPUT COMMON-MODE VOLTAGE
MAX4249 -57TOC06
MAX4251/MAX4256
INPUT OFFSET VOLTAGE DISTRIBUTION
0
50
100
150
200
250
VOUT SWING FROM EITHER SUPPLY (mV)
VDD = 5V
RL REFERENCED TO GND
60
50
0
50
100
150
200
250
VOUT SWING FROM EITHER SUPPLY (mV)
_______________________________________________________________________________________
5
MAX4249–MAX4257
Typical Operating Characteristics
Typical Operating Characteristics (continued)
(VDD = 5V, VSS = 0V, VCM = VOUT = VDD/2, input noise floor of test equipment =10nV/√Hz for all distortion measurements,
TA = +25°C, unless otherwise noted.)
AV (dB)
100
90
RL = 100kΩ
VOUT = 10mV
TO 4.99mV
110
80
105
70
-20
SHDN = VSS
380
0.3
360
0.2
340
0.1
320
0
2.3
2.8
3.3
3.8
4.3
4.8
80
30
GAIN
20
60
144
50
108
40
72
30
0
0
-36
120
0.01
0.1
1
1.8
5
MAX4249-57 TOC17
VDD = 3V, 5V
RL = 50kΩ
CL = 20pF
AV = 1000
GAIN
0
144
-10
108
-20
20
36
10
0
0
-36
PHASE
-30
-144
-100
-180
10M
-40
-180
10M
-110
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
5.3
1M
PSRR+
-70
-144
1k
4.8
VDD = 3V, 5V
-60
-40
100
4.3
-50
-30
1M
3.8
-40
-90
100k
3.3
-30
-80
10k
2.8
MAX4250–MAX4254
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
180
72
-10
2.3
SUPPLY VOLTAGE (V)
-72
1k
RL = 100kΩ
40
-108
100
RL = 1kΩ
80
-20
-72
PHASE
-20
80
RL = 10kΩ
100
-108
-10
60
140
VDD = 3V
180
10
40
VCM = 0
VOUT = VDD/2
RL REFERENCED TO GND
160
400
100
0.001
36
180
VDD = 5V
MAX4249/MAX4255/MAX4256/MAX4257
GAIN AND PHASE vs. FREQUENCY
40
20
INPUT OFFSET VOLTAGE
vs. SUPPLY VOLTAGE
MAX4250–MAX4254
GAIN AND PHASE vs. FREQUENCY
50
0
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
MAX4249-57 TOC16
0.373
-20
60
5.3 5.5
VDD = 3V, 5V
RL = 50kΩ
CL = 20pF
AV = 1000
SHDN = VSS
-40
SUPPLY VOLTAGE (V)
60
6
60
1000
GAIN (dB)
1.8
SUPPLY CURRENT (µA)
0.4
PHASE (DEGREES)
400
40
2000
SHUTDOWN SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
0.5
SHDN = VDD
20
SUPPLY CURRENT
vs. OUTPUT VOLTAGE
0.6
420
0
MAX4249-57 TOC14
MAX4249-57 TOC13
0.374
TEMPERATURE (°C)
SUPPLY CURRENT AND SHUTDOWN
SUPPLY CURRENT vs. SUPPLY VOLTAGE
PER AMPLIFIER
SHDN = VDD
380
340
-40
50
100
150
200
250
VOUT SWING FROM EITHER SUPPLY (mV)
VOS (µV)
0
400
360
100
50
440
RL = 10kΩ
VOUT = 20mV
TO 4.975mV
RL = 1kΩ
VOUT = 150mV
TO 4.75mV
VDD = 5V
RL REFERENCED TO GND
0.375
420
PSRR-
1
10
100
1k
10k
100k
FREQUENCY (Hz)
_______________________________________________________________________________________
1M
10M
SHUTDOWN SUPPLY CURRENT (µA)
115
110
60
440
MAX4249-57 TOC15
RL = 2kΩ
RL REFERENCED TO VDD/2
VDD = 5V
PHASE (DEGREES)
PSRR (dB)
AV (dB)
120
120
0.376
PER AMPLIFIER
MAX4249-57 TOC18
RL = 20kΩ
130
MAX4249-57 TOC12
460
SUPPLY CURRENT (µA)
RL = 200kΩ
140
125
MAX4249-57 TOC10
150
SUPPLY CURRENT AND SHUTDOWN
SUPPLY CURRENT vs. TEMPERATURE
LARGE-SIGNAL VOLTAGE GAIN
vs. TEMPERATURE
MAX4249-57 TOC11
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
GAIN (dB)
MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
(VDD = 5V, VSS = 0V, VCM = VOUT = VDD/2, input noise floor of test equipment =10nV/√Hz for all distortion measurements,
TA = +25°C, unless otherwise noted.)
INPUT VOLTAGE-N0ISE DENSITY
vs. FREQUENCY
10
1
AV = 1 (MAX4250–MAX4254)
0.1
1k
100k
1M
VP-PNOISE = 760nVP-P
0
10
100
10k
-100
VIN
-20
HD2 HD4
MAX4250–MAX4254
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT VOLTAGE (VDD = 5V)
10
AV = 10
VIN
fO = 3kHz
FILTER BW = 30kHz
VO
-40
10kΩ
fO
100kΩ
11kΩ
-60
-80
HD2
-100
100kΩ
11kΩ
0.1
RL = 1kΩ
0.01
HD3
HD5
VO
RL
1
THD+N (%)
fO
VOUT = 4VP-P
fO = 1kHz
0
1s/div
100k
MAX4249-57 TOC23
20
AMPLITUDE (dBc)
-60
HD3
RL = 10kΩ
-120
-140
-140
-160
10k
15k
10
20k
5k
0
VIN
VOUT
RL
1
1
MAX4249-57 TOC25
10
VIN
AV = 10
VOUT
RL
100kΩ
11kΩ
THD+N (%)
0.1
RL = 1kΩ
100kΩ
fO = 20kHz, FILTER BW = 80kHz
0.001
0
1
1
5
VOUT
RL
0.1
R1
R2
AV = 100
R1 = 560Ω, R2 = 53kΩ
0.01
AV = 10
0.001
0.001
3
FILTER BW = 22kHz
RL = 10kΩ TO GND
VO = 2VP-P
AV = 1
fO = 3kHz, FILTER BW = 30kHz
OUTPUT VOLTAGE (VP-P)
4
VIN
RL = 100kΩ
2
3
R1 = 5.6kΩ, R2 = 53kΩ
RL = 10kΩ
AV = 10
fO = 3kHz
FILTER BW = 30kHz
2
MAX4250–MAX4254
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
0.01
0.01
1
OUTPUT VOLTAGE (VP-P)
MAX4249/MAX4255/MAX4256/MAX4257
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT VOLTAGE SWING
MAX4250–MAX4254
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT VOLTAGE SWING (VDD = 3V)
0.1
RL = 100kΩ
0.001
20k
FREQUENCY (Hz)
FREQUENCY (Hz)
11kΩ
15k
10k
THD+N (%)
5k
MAX4249-57 TOC26
10
THD+N (%)
1k
MAX4249/MAX4255/MAX4256/MAX4257
FFT OF DISTORTION AND NOISE
RL = 1kΩ
fO = 1kHz
AV = 1
MAX4249-57 TOC21
5
10M
-40
AMPLITUDE (dBc)
10
MAX4250–MAX4254
FFT OF DISTORTION AND NOISE
-20
-120
200nV/div
15
FREQUENCY (Hz)
VOUT = 2VP-P
-80
20
FREQUENCY (Hz)
MAX4249-57 TOC22
0
10k
VDD = 3V OR 5V
MAX4249-57 TOC24
100
25
MAX4249-57 TOC27
AV = 10 (MAX4249/MAX4255/
MAX4256/MAX4257)
0.1Hz TO 10HzP-P NOISE
30
MAX4249-57 TOC20
MAX4249-57 TOC19
OUTPUT IMPEDANCE (Ω)
1000
Vn-EQUIVALENT INPUT NOISE-VOLTAGE (nV/√Hz)
OUTPUT IMPEDANCE
vs. FREQUENCY
0.0001
0
1
2
3
OUTPUT VOLTAGE (VP-P)
4
5
10
100
1k
10k
FREQUENCY (Hz)
_______________________________________________________________________________________
7
MAX4249–MAX4257
Typical Operating Characteristics (continued)
Typical Operating Characteristics (continued)
(VDD = 5V, VSS = 0V, VCM = VOUT = VDD/2, input noise floor of test equipment =10nV/√Hz for all distortion measurements,
TA = +25°C, unless otherwise noted.)
MAX4250–MAX4254
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX4250–MAX4254
SMALL-SIGNAL PULSE RESPONSE
1.5V
0.6V
VOUT
20mV/div
0.01
VOUT
200mV/div
RL TO VDD/2
MAX4249-57 TOC30
FILTER BW = 80kHz
AV = 1
RL = 1kΩ
VOUT = 2VP-P
MAX4249-57 TOC29
MAX4250–MAX4254
LARGE-SIGNAL PULSE RESPONSE
MAX4249-57 TOC28
0.1
THD+N(%)
RL TO GND
0.001
0.5V
RL TO VDD
0.0001
10
100
1k
VDD = 3V
RL = 10kΩ
CL = 100pF
VIN = 1V PULSE
VDD = 3V
RL = 10kΩ
CL = 100pF
VIN = 100V PULSE
0.5V
2µs/div
2µs/div
10k
FREQUENCY (Hz)
MAX4249/MAX4255/MAX4256/MAX4257
SMALL-SIGNAL PULSE RESPONSE
1.6V
VOUT
200mV/div
1V
VDD = 3V
RL = 10kΩ
CL = 100pF
VIN = 100mV PULSE
AV = 10
2µs/div
8
VOUT
50mV/div
1.5V
VDD = 3V
RL = 10kΩ
CL = 100pF
VIN = 10mV PULSE
AV = 10
2µs/div
MAX4249-57 TOC33
MAX4249-57 TOC32
2V
CHANNEL SEPARATION vs. FREQUENCY
140
130
CHANNEL SEPARATION (dB)
MAX4249/MAX4255/MAX4256/MAX4257
LARGE-SIGNAL PULSE RESPONSE
MAX4249-57 TOC31
MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
120
110
100
90
80
70
0
1k
10k
100k
FREQUENCY (Hz)
_______________________________________________________________________________________
1M
10M
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
PIN/BUMP
MAX4250/
MAX4255
MAX4251/
MAX4256
MAX4252/
MAX4257
MAX4252
MAX4249/
MAX4253
5-PIN
SOT23
8-PIN
SO/µMAX
8-PIN
SO/µMAX
8-BUMP
UCSP
10-BUMP
UCSP
10-PIN
µMAX
14-PIN
SO
14-PIN
SO
1
6
1, 7
A1, A3
A1, C1
1, 9
1, 13
1, 7, 8,
14
MAX4254
2
4
4
C2
B4
4
4
11
3
3
3, 5
C1, C3
A3, C3
3, 7
3, 11
3, 5, 10,
12
4
2
2, 6
B1, B3
A2, C2
2, 8
2, 12
2, 6, 9,
13
5
7
8
A2
B1
10
14
4
NAME
OUT, OUTA,
OUTB,
OUTC,
OUTD
VSS
IN+, INA+,
INB+, INC+,
IND+
IN-, INA-,
INB-,
INC-, INDVDD
FUNCTION
Amplifier Output
Negative Supply.
Connect to
ground for singlesupply operation
Noninverting
Amplifier Input
Inverting
Amplifier Input
Positive Supply
Shutdown Input,
Connect to VDD
or leave
unconnected for
normal operation
(amplifier(s)
enabled).
—
8
—
—
A4, C4
5, 6
6, 9
—
SHDN,
SHDNA,
SHDNB
—
1, 5
—
—
—
—
5, 7,
8, 10
—
N.C.
No Connection.
Not internally
connected.
—
—
—
B2
B2, B3
—
—
—
—
Not populated
with solder
sphere
Detailed Description
The MAX4249–MAX4257 single-supply operational
amplifiers feature ultra-low noise and distortion while
consuming very little power. Their low distortion and low
noise make them ideal for use as preamplifiers in wide
dynamic-range applications, such as 16-bit analog-todigital converters (see Typical Operating Circuit). Their
high-input impedance and low noise are also useful for
signal conditioning of high-impedance sources, such
as piezoelectric transducers.
These devices have true rail-to-rail output operation,
drive loads as low as 1kΩ while maintaining DC accura-
cy, and can drive capacitive loads up to 400pF without
oscillation. The input common-mode voltage range
extends from VDD - 1.1V to 200mV beyond the negative
rail. The push-pull output stage maintains excellent DC
characteristics, while delivering up to ±5mA of current.
The MAX4250–4254 are unity-gain stable, whereas, the
MAX4249/MAX4255/MAX4256/MAX4257 have a higher
slew rate and are stable for gains ≥ 10V/V. The
MAX4249/MAX4251/MAX4253/MAX4256 feature a lowpower shutdown mode, which reduces the supply current to 0.5µA and disables the outputs.
The MAX4250AAUK is specified for operation over the
automotive (-40°C to +125°C) temperature range.
_______________________________________________________________________________________
9
MAX4249–MAX4257
Pin/Bump Description
MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
Low Distortion
Many factors can affect the noise and distortion that the
device contributes to the input signal. The following
guidelines offer valuable information on the impact of
design choices on Total Harmonic Distortion (THD).
Choosing proper feedback and gain resistor values for
a particular application can be a very important factor
in reducing THD. In general, the smaller the closedloop gain, the smaller the THD generated, especially
when driving heavy resistive loads. Large-value feedback resistors can significantly improve distortion. The
THD of the part normally increases at approximately
20dB per decade, as a function of frequency.
Operating the device near or above the full-power
bandwidth significantly degrades distortion.
Referencing the load to either supply also improves the
part’s distortion performance, because only one of the
MOSFETs of the push-pull output stage drives the output. Referencing the load to midsupply increases the
part’s distortion for a given load and feedback setting.
(See the Total Harmonic Distortion vs. Frequency graph
in the Typical Operating Characteristics.)
For gains ≥ 10V/V, the decompensated devices
MAX4249/MAX4255/MAX4256/MAX4257 deliver the
best distortion performance, since they have a higher
slew rate and provide a higher amount of loop gain for
a given closed-loop gain setting. Capacitive loads
below 400pF, do not significantly affect distortion
results. Distortion performance remains relatively constant over supply voltages.
CZ
RF
RG
VOUT
VIN
Figure 1. Adding Feed-Forward Compensation
AV = 2V/V
RF = RG = 10kΩ
VIN =
50mV/div
100mV
0
VOUT =
100mV/div
2µs/div
Low Noise
The amplifier’s input-referred, noise-voltage density is
dominated by flicker noise at lower frequencies, and by
thermal noise at higher frequencies. Because the thermal noise contribution is affected by the parallel combination of the feedback resistive network (R F || R G ,
Figure 1), these resistors should be reduced in cases
where the system bandwidth is large and thermal noise
is dominant. This noise contribution factor decreases,
however, with increasing gain settings.
For example, the input noise-voltage density of the circuit with RF = 100kΩ, RG = 11kΩ (AV = 10V/V) is en =
15nV/√Hz, en can be reduced to 9nV/√Hz by choosing
RF = 10kΩ, RG = 1.1kΩ (AV = 10V/V), at the expense
of greater current consumption and potentially higher
distortion. For a gain of 100V/V with RF = 100kΩ, RG =
1.1kΩ, the en is low (9nV/√Hz).
Figure 2a. Pulse Response with No Feed-Forward
Compensation
AV = 2
RF = RG = 100kΩ
CZ = 11pF
100mV
50mV/div
VIN
0
100mV/div
VOUT
2µs/div
Figure 2b. Pulse Response with 10pF Feed-Forward
Compensation
10
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
RISO
VOUT
CL
MAX4250
MAX4251
MAX4252
MAX4253
MAX4254
VIN
The amplifier’s input capacitance is 11pF. If the resistance seen by the inverting input is large (feedback
network), this can introduce a pole within the amplifier’s
bandwidth, resulting in reduced phase margin.
Compensate the reduced phase margin by introducing
a feed-forward capacitor (CZ) between the inverting
input and the output (Figure 1). This effectively cancels
the pole from the inverting input of the amplifier.
Choose the value of CZ as follows:
CZ = 11 x (RF / RG) [pF]
Figure 3. Overdriven Input Showing No Phase Reversal
4.25V
VOUT
0
4.45V
VIN
-200mV
0
AV = 1
VDD = 5V
RL = 10kΩ
In the unity-gain stable MAX4250–MAX4254, the use of
a proper C Z is most important for A V = 2V/V, and
A V = -1V/V. In the decompensated MAX4249/
MAX4255/MAX4256/MAX4257, CZ is most important
for A V = 10V/V. Figures 2a and 2b show transient
response both with and without CZ.
Using a slightly smaller CZ than suggested by the formula above achieves a higher bandwidth at the
expense of reduced phase and gain margin. As a general guideline, consider using CZ for cases where RG ||
R F is greater than 20kΩ (MAX4250–MAX4254) or
greater than 5kΩ (MAX4249/MAX4255/MAX4256/
MAX4257).
Applications Information
The MAX4249–MAX4257 combine good driving capability with ground-sensing input and rail-to-rail output
operation. With their low distortion, low noise, and lowpower consumption, these devices are ideal for use in
portable instrumentation systems and other low-power,
noise-sensitive applications.
20µs/div
Figure 4. Rail-to-Rail Output Operation
Ground-Sensing and Rail-to-Rail Outputs
5V
VOUT
1V/div
0
VDD = 5V
RL = 10kΩ
AV = 10
f = 1kHz
The common-mode input range of these devices
extends below ground, and offers excellent commonmode rejection. These devices are guaranteed not to
undergo phase reversal when the input is overdriven
(Figure 3).
Figure 4 showcases the true rail-to-rail output operation
of the amplifier, configured with AV = 10V/V. The output
swings to within 8mV of the supplies with a 10kΩ load,
making the devices ideal in low-supply-voltage applications.
Output Loading and Stability
200µs/div
Figure 5. Capacitive-Load Driving Circuit
Even with their low quiescent current of 400µA, these
amplifiers can drive 1kΩ loads while maintaining excellent DC accuracy. Stability while driving heavy capacitive loads is another key feature.
______________________________________________________________________________________
11
MAX4249–MAX4257
Using a Feed-Forward Compensation
Capacitor, CZ
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
4.5
140
4.0
UNITY-GAIN BANDWIDTH (MHz)
160
RISO (Ω)
120
100
80
60
SHADED AREA INDICATES
STABLE OPERATION
WITH NO NEED FOR
ISOLATION RESISTOR.
40
20
3.0
2.5
2.0
1.5
SHADED AREA INDICATES
STABLE OPERATION
WITH NO NEED FOR
ISOLATION RESISTOR.
1.0
0
10
100
1000
10,000
CAPACITIVE LOADING (pF)
Figure 6. Isolation Resistance vs. Capacitive Loading to
Minimize Peaking (<2dB)
MAX4250–MAX4254 (AV = 1)
MAX4249/MAX4255–MAX4257 (AV = 10)
RISO = 0
SHADED AREA INDICATES
STABLE OPERATION
WITH NO NEED FOR
ISOLATION RESISTOR.
15
5
0
100
1000
10,000
NOTE: RISO CHOSEN FOR PEAKING <2dB.
Figure 8. MAX4250–MAX4254 Unity-Gain Bandwidth vs.
Capacitive Load
Power Supplies and Layout
10
10
100
For example, if the capacitive load is 1000pF, the corresponding isolation resistor is 150Ω. Figure 7 shows that
peaking occurs without the isolation resistor. Figure 8
shows the unity-gain bandwidth vs. capacitive load for
the MAX4250–MAX4254.
25
20
10
CAPACITIVE LOAD (pF)
NOTE: USING AN ISOLATION RESISTOR REDUCES PEAKING.
PEAKING (dB)
3.5
0.5
0
1000
10,000
CAPACITIVE LOAD (pF)
Figure 7. Peaking vs. Capacitive Load
These devices maintain stability while driving loads up
to 400pF. To drive higher capacitive loads, place a
small isolation resistor in series between the output of
the amplifier and the capacitive load (Figure 5). This
resistor improves the amplifier’s phase margin by isolating the capacitor from the op amp’s output. Reference
Figure 6 to select a resistance value that will ensure a
load capacitance that limits peaking to <2dB (25%).
12
VDD = 3V
The MAX4249–MAX4257 operate from a single 2.4V to
5.5V power supply or from dual supplies of ±1.20V to
±2.75V. For single-supply operation, bypass the power
supply with a 0.1µF ceramic capacitor placed close to
the VDD pin. If operating from dual supplies, bypass
each supply to ground.
Good layout improves performance by decreasing the
amount of stray capacitance and noise at the op amp’s
inputs and output. To decrease stray capacitance, minimize PC board trace lengths and resistor leads, and
place external components close to the op amp’s pins.
UCSP Applications Information
For the latest application details on UCSP construction,
dimensions, tape carrier information, PC board techniques, bump-pad layout, and recommended reflow
temperature profile, as well as the latest information on
reliability testing results, refer to the Application Note:
UCSP—A Wafer-Level Chip-Scale Package on Maxim’s
web site at www.maxim-ic.com/ucsp.
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
5V
VDD
50kΩ
2
MAX195
7
(16-BIT ADC)
6
3
VIN
MAX4256
4
8
AIN
DOUT
SHDN
SCLK
SERIAL
INTERFACE
CS
5kΩ
REF
4.096V
VSS
-5V
SHDN
Selector Guide
PART
GAIN
BANDWIDTH
(MHz)
MINIMUM
STABLE
GAIN (V/V)
NO. OF
AMPLIFIERS
PER PACKAGE
SHUTDOWN
MODE
MAX4249
22
10
2
Yes
PIN-PACKAGE
10-pin µMAX, 14-pin SO
MAX4250/A
3
1
1
—
MAX4251
3
1
1
Yes
5-pin SOT23
MAX4252
3
1
2
—
MAX4253
3
1
2
Yes
MAX4254
3
1
4
—
MAX4255
22
10
1
—
MAX4256
22
10
1
Yes
8-pin µMAX/SO
MAX4257
22
10
2
—
8-pin µMAX/SO
8-pin µMAX/SO
8-pin µMAX/SO, 8-bump UCSP
10-pin µMAX, 14-pin SO,
10-bump UCSP
14-pin SO
5-pin SOT23
______________________________________________________________________________________
13
MAX4249–MAX4257
Typical Operating Circuit
MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
Pin/Bump Configurations (continued)
TOP VIEW
1
5
N.C. 1
VDD
IN- 2
MAX4250
MAX4250A
MAX4255
VSS 2
IN+ 3
IN+
4
VSS 4
IN-
VDD
INA- 2
6
OUT
INA+
5
N.C.
3
VSS 4
INB-
5
INB+
μMAX/SO
+
14 VDD
14 OUTD
OUTA 1
2
13 IND-
3
12 IND+
7
INB+
VSS 4
5
6
SHDNB
N.C. 5
MAX4249
MAX4253
MAX4254
11 INB+
VDD 4
10 N.C.
INB+ 5
10 INC+
SHDNA 6
9
SHDNB
INB- 6
9
INC-
N.C. 7
8
N.C.
OUTB 7
8
OUTC
SO
SO
Ordering Information (continued)
TEMP RANGE
PINPACKAGE
TOP
MARK
MAX4251ESA+
-40°C to +85°C
8 SO
—
MAX4251EUA+
-40°C to +85°C
8 µMAX
—
MAX4252EBL+T
-40°C to +85°C
8 UCSP
AAO
MAX4252ESA+
-40°C to +85°C
8 SO
—
MAX4252EUA+
-40°C to +85°C
8 µMAX
—
MAX4253EBC+T
-40°C to +85°C
10 UCSP
AAK
MAX4253EUB+
-40°C to +85°C
10 µMAX
—
MAX4253ESD+
-40°C to +85°C
14 SO
—
MAX4254ESD+
-40°C to +85°C
14 SO
MAX4255EUK+T
-40°C to +85°C
5 SOT23
MAX4256ESA+
-40°C to +85°C
8 SO
—
ACCJ
—
MAX4256EUA+
-40°C to +85°C
8 µMAX
—
MAX4257ESA+
-40°C to +85°C
8 SO
—
MAX4257EUA+
-40°C to +85°C
8 µMAX
—
14
6
INA-
4
PART
OUTB
INA+
INA+
μMAX
7
12 INB-
INB-
MAX4249
MAX4253
MAX4252
MAX4257
VDD
3
OUTB
VSS
7
8
13 OUTB
8
SHDNA
OUTA 1
2
9
3
SHDN
+
OUTA 1
10 VDD
INA-
2
8
μMAX/SO
+
OUTA 1
INA-
MAX4251
MAX4256
3
SOT23
INA+
+
+
+
OUT
______________________________________________________________________________________
11 VSS
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND
PATTERN NO.
5 SOT-23
U5+2
21-0057
90-0174
8 µMAX
U8+1
21-0036
90-0092
10 µMAX
U10+2
21-0061
90-0330
3 x 3 µCSP
B9+5
21-0093
—
14 SOIC
S14+1
21-0041
90-0112
12 µCSP
B12+4
21-0104
—
______________________________________________________________________________________
15
MAX4249–MAX4257
Package Information
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a "+", "#", or
"-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a "+", "#", or
"-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
α
α
16
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
α
α
______________________________________________________________________________________
17
MAX4249–MAX4257
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a "+", "#", or
"-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a "+", "#", or
"-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
9LUCSP, 3x3.EPS
MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
18
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
______________________________________________________________________________________
19
MAX4249–MAX4257
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a "+", "#", or
"-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a "+", "#", or
"-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
20
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
REVISION
NUMBER
REVISION
DATE
8
10/11
DESCRIPTION
Added lead-free packaging to the Ordering Information and changed the Input Bias
Current and Input Offset Current conditions in the Electrical Characteristics table
PAGES
CHANGED
1, 2, 14
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. The parametric values (min and max limits) shown in
the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
21 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2011 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX4249–MAX4257
Revision History