MAXIM MAX4256ESA

19-1295; Rev 3; 8/01
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 MAX4249/4251/
4253/4256 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-to-rail and their
input common-mode voltage range includes ground.
The MAX4250–MAX4254 are unity-gain 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-pin UCSP
package and the MAX4253 is available in a 10-pin
UCSP package.
Features
♦ Available in Space-Saving UCSP™, SOT23, and
µMAX Packages
♦
♦
♦
♦
♦
♦
♦
♦
♦
Low Distortion: 0.0002% THD (1kΩ load)
400µA Quiescent Supply Current per Amplifier
Single-Supply Operation from +2.4V to +5.5V
Input Common-Mode Voltage Range Includes
Ground
Outputs Swing Within 8mV of Rails with a 10kΩ
Load
3MHz GBW Product, Unity-Gain Stable
(MAX4250–MAX4254)
22MHz GBW Product, Stable with AV ≥ 10V/V
(MAX4249/MAX4255/MAX4256/MAX4257)
Excellent DC Characteristics
VOS = 70µV
IBIAS = 1pA
Large-Signal Voltage Gain = 116dB
Low-Power Shutdown Mode:
Reduces Supply Current to 0.5µA
Places Outputs in a High-Impedance State
400pF Capacitive-Load Handling Capability
Applications
Wireless Communications Devices
PA Control
Ordering Information
TEMP. RANGE
PIN/BUMPPACKAGE
MAX4249ESD
-40°C to +85°C
14 SO
—
MAX4249EUB
-40°C to +85°C
10 µMAX
—
MAX4250EUK-T
-40°C to +85°C
5 SOT23-5
PART
Portable/Battery-Powered Equipment
Medical Instrumentation
ADC Buffers
Digital Scales/Strain Gauges
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
UCSP is a trademark of Maxim Integrated Products, Inc.
TOP
MARK
ACCI
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
(BUMPS ON BOTTOM)
MAX4253
MAX4252
1
A
OUTA
B
INA-
C
INA+
2
VDD
3
OUTB
INB-
VSS
INB+
A1
A2
A3
OUTB
INB-
INB+
A4
B1
SHDNB
B4
VDD
VSS
C1
C2
C3
OUTA
INA-
INA+
C4
SHDNA
UCSP
UCSP
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
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-Pin µMAX (derate 4.5mW/°C above +70°C) ............362mW
8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
8-Pin UCSP (derate 4.7mW/°C above +70°C) ............379mW
10-Pin UCSP (derate 6.1mW/°C above +70°C) ...........484mW
Note 1:
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 +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Bump Temperature (soldering) (Note 1)
Infrared (15s) ................................................................+220°C
Vapor Phase (60s) ........................................................+215°C
This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recommended in the industry-standard specification, JEDEC 020A, paragrah 7.6, Table 3 for IR/VPR and Convection Reflow.
Preheating is required. Hand or wave soldering is not allowed.
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 = 0, VCM = 0, VOUT = VDD/2, RL tied to VDD/2, SHDN = VDD, TA = -40°C to +125°C, unless otherwise noted. Typical
values are at TA = +25°C.) (Notes 2, 3)
PARAMETER
Supply Voltage Range
Quiescent Supply Current per
Amplifier
SYMBOL
VDD
CONDITIONS
(Note 4)
MIN
TYP
2.4
UNITS
5.5
V
VDD = +3V
400
VDD = +5V
420
575
VDD = +5V, UCSP only
420
655
Shutdown mode (SHDN = VSS) (Note 2)
0.5
1.5
±0.75
Normal mode
IQ
µA
Input Offset Voltage (Note 5)
VOS
±0.07
Input Offset Voltage Tempco
TCVOS
0.3
Input Bias Current
MAX
mV
µV/°C
IB
(Note 6)
±1
±100
pA
Input Offset Current
IOS
(Note 6)
±1
±100
pA
Differential Input Resistance
RIN
Input Common-Mode Voltage
Range
VCM
1000
Guaranteed by CMRR Test
-0.2
GΩ
VDD - 1.1
V
Common-Mode Rejection Ratio
CMRR
VSS - 0.2V ≤ VCM ≤ VDD - 1.1V
70
115
dB
Power-Supply Rejection Ratio
PSRR
VDD = 2.4 to 5.5V
75
100
dB
RL = 10kΩ to VDD/2;
VOUT = 25mV to VDD - 4.97V
80
116
RL = 1kΩ to VDD/2;
VOUT = 150V to VDD - 4.75V
80
112
Large-Signal Voltage Gain
Output Voltage Swing
2
AV
VOUT
|VIN+ - VIN-| ≥ 10mV
RL = 10kΩ to VDD/2
dB
VDD – VOH
8
25
VOL - VSS
7
20
_______________________________________________________________________________________
mV
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
(VDD = +5V, VSS = 0, VCM = 0, VOUT = VDD/2, RL tied to VDD/2, SHDN = VDD, TA = -40°C to +125°C, unless otherwise noted. Typical
values are at TA = +25°C) (Notes 2, 3)
PARAMETER
Output Voltage Swing
Output Short-Circuit Current
Output Leakage Current
SYMBOL
VOUT
CONDITIONS
|VIN+ - VIN-| ≥ 10mV,
RL = 1kΩ to VDD/2
TYP
MAX
VDD – VOH
77
200
VOL - VSS
47
100
ISC
ILEAK
68
Shutdown mode (SHDN = VSS),
VOUT = VSS to VDD (Note 2)
SHDN Logic Low
VIL
(Note 2)
SHDN Logic High
VIH
(Note 2)
SHDN Input Current
IIL/IIH
SHDN = VSS = VDD (Note 2)
Slew Rate
GBW
SR
Peak-to-Peak Input Noise
Voltage
Input Voltage Noise Density
Input Current Noise Density
en(p-p)
en
in
0.5
MAX4250–MAX4254
3
MAX4249/MAX4255/MAX4256/MAX4257
22
MAX4250–MAX4254
0.3
MAX4249/MAX4255/MAX4256/MAX4257
2.1
f = 0.1Hz to 10Hz
760
f = 10Hz
2.7
f = 1kHz
8.9
f = 30kHz
7.9
f = 1kHz
0.5
MAX4250–MAX4254
AV = +1V/V, VOUT =
2Vp-p, RL = 1kΩ to GND
(Note 7)
Total Harmonic Distortion Plus
Noise
THD+N
Capacitive-Load Stability
GM
ΦM
MAX4249/MAX4255/
MAX4256/MAX4257
AV = +1V/V, VOUT =
2Vp-p, RL = 1kΩ to GND
(Note 7)
mV
1.0
µA
0.2 X VDD
V
V
11
Gain Bandwidth Product
Phase Margin
0.001
UNITS
mA
0.8 X VDD
Input Capacitance
Gain Margin
MIN
1.5
µA
pF
MHz
V/µs
f = 1kHz
0.0004
f = 20kHz
0.006
f = 1kHz
0.0012
f = 20kHz
0.007
nVp-p
nV/√Hz
fA/√Hz
%
No sustained oscillations
400
MAX4250–MAX4254, AV = +1V/V
10
MAX4249/MAX4255/MAX4256/MAX4257,
AV = +10V/V
pF
dB
12.5
MAX4250–MAX4254, AV = +1V/V
74
MAX4249/MAX4255/MAX4256/MAX4257,
AV = +10V/V
68
degrees
_______________________________________________________________________________________
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 = 0, VCM = 0, VOUT = VDD/2, RL tied to VDD/2, SHDN = VDD, TA = -40°C to +125°C, unless otherwise noted. Typical
values are at TA = +25°C) (Notes 2, 3)
PARAMETER
SYMBOL
To 0.01%, VOUT
= 2V step
Settling Time
Delay Time to Shutdown
Delay Time to Enable
Power-Up Delay Time
CONDITIONS
tSH
tEN
tPU
IVDD = 5% of
normal
operation
VOUT = 2.5V,
VOUT settles to
0.1%
MIN
TYP
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
MAX
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 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
UNITS
_______________________________________________________________________________________
µs
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
(VDD = +5V, VSS = 0, VCM = VOUT = VDD/2, input noise floor of test equipment =10nV/√Hz for all distortion measurements,
TA = +25°C, unless otherwise noted.)
100
25
20
0
-50
15
-100
10
-150
-200
0
-250
-95
-75
-55
-35
-13
7
28
49
69
90
110
131
152
172
192
5
-20
0
20
40
MAX4249 TOC03
1.5
2.5
3.5
OUTPUT VOLTAGE SWING (VOL)
vs. TEMPERATURE
0.09
RL = 1kΩ
0.08
0.05
0.07
0.2
0.05
0.02
0.02
RL = 10kΩ
0.01
0.01
3
4
5
6
7
8
9
0
-40
10
RL = 10kΩ
RL = 100kΩ
RL = 100kΩ
0
2
0.03
0.04
0.03
0
RL = 1kΩ
0.04
0.06
VOL (V)
VDD - VOH (V)
VOL
-20
0
20
40
60
80
-40
-20
0
20
40
60
TEMPERATURE (°C)
TEMPERATURE (°C)
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
LARGE-SIGNAL VOLTAGE GAIN
vs. OUTPUT VOLTAGE SWING
130
AV (dB)
90
100
90
80
110
RL = 200kΩ
RL = 20kΩ
110
100
RL = 2kΩ
70
50
100
150
200
VOUT SWING FROM EITHER SUPPLY (mV)
VDD = +3V
RL REFERENCED TO VDD
60
50
250
RL = 2kΩ
90
70
70
VDD = +3V
RL REFERENCED TO GND
RL = 20kΩ
100
80
80
60
120
120
RL = 2kΩ
RL = 200kΩ
130
AV (dB)
RL = 20kΩ
110
140
MAX4249 TOC08
120
140
MAX4249TOC07
130
RL = 200kΩ
80
MAX4249TOC09
OUTPUT LOAD CURRENT (mA)
140
4.5
0.06
MAX4249 TOC05
0.10
MAX4249 TOC04
0.3
0
0.5
OUTPUT VOLTAGE SWING (VOH)
vs. TEMPERATURE
0.4
1
0
-50
-0.5
80
VDD = +5V
OUTPUT VOLTAGE
vs. OUTPUT LOAD CURRENT
VDD - VOH
0
VDD = +3V
50
INPUT COMMON-MODE VOLTAGE (V)
0.1
AV (dB)
60
100
TEMPERATURE (°C)
VDD = +3V OR +5V
VDIFF = ±10mV
0.5
-40
150
VOS (µV)
0.6
OUTPUT VOLTAGE (V)
50
200
MAX4249 TOC06
150
VOS (µV)
NUMBER OF UNITS
30
VCM = 0
200
INPUT OFFSET VOLTAGE (µV)
35
MAX4249 TOC02
400 UNITS
VCM = 0
TA = +25°C
INPUT OFFSET VOLTAGE vs.
COMMON-MODE INPUT VOLTAGE
250
MAX4249 TOC01
40
OFFSET VOLTAGE
vs. TEMPERATURE
MAX4251/MAX4256
INPUT OFFSET VOLTAGE DISTRIBUTION
0
50
100
150
200
VOUT SWING FROM EITHER SUPPLY (mV)
VDD = +5V
RL REFERENCED TO GND
60
50
250
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 = 0, VCM = VOUT = VDD/2, input noise floor of test equipment =10nV/√Hz for all distortion measurements,
TA = +25°C, unless otherwise noted.)
MAX4249 TOC11
RL = 20kΩ
130
120
RL REFERENCED T0 VDD/2
VDD = +5V
RL = 2kΩ
110
115
AV (dB)
100
RL = 100kΩ
VOUT = 10mV
to 4.99V
110
90
80
70
105
VDD = +5V
RL REFERENCED TO VDD
60
50
50
100
150
200
250
400
SHDN = VDD
0.374
380
RL = 10kΩ
VOUT = 20mV
TO 4.975V
360
0.373
340
-40
-20
0
20
40
60
-40
80
-20
0
20
40
60
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY CURRENT AND SHUTDOWN
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT
vs. OUTPUT VOLTAGE
INPUT OFFSET VOLTAGE
vs. SUPPLY VOLTAGE
SHDN = VSS
0.3
360
0.2
340
0.1
320
2.3
2.8
3.3
3.8
4.3
4.8
MAX4249 TOC14
VDD = +5V
100
0.001
5.3 5.5
180
VDD = +3V, +5V
144
RL = 50k Ω
CL = 20pF
108
AV = 1000
72
40
0.01
36
0
10
-36
0
-10
PHASE
-20
0.1
1
1.8
5
50
40
30
VDD = +3V, +5V
RL = 50k Ω
CL = 20pF
AV = 1000
GAIN
180
0
144
-10
108
-20
72
20
36
10
0
-36
0
PHASE
-72
-10
-108
-20
-108
-90
-144
-100
-180
10M
-110
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
1M
MAX4249 TOC18
PSRR+
-80
-30
1k
5.3
-70
-72
100
4.8
VDD = +3V, +5V
-60
-40
1M
4.3
-50
-180
10M
100k
3.8
-40
-144
10k
3.3
-30
-40
1k
2.8
MAX4250–MAX4254
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-30
100
2.3
SUPPLY VOLTAGE (V)
MAX4249 TOC17
60
GAIN (dB)
GAIN
20
RL = 100kΩ
MAX4249/MAX4255/MAX4256/MAX4257
GAIN AND PHASE vs. FREQUENCY
PHASE (DEGREES)
30
80
OUTPUT VOLTAGE (V)
MAX4249 TOC16
40
RL = 1kΩ
60
MAX4250–MAX4254
GAIN AND PHASE vs. FREQUENCY
50
RL = 10kΩ
100
VDD = +3V
SUPPLY VOLTAGE (V)
60
120
400
0
1.8
140
1000
PSRR (dB)
380
VCM = 0
VOUT = VDD/2
RL REFERENCED TO GND
160
VOS (µV)
0.4
SUPPLY CURRENT (µA)
0.5
SHDN = VDD
180
2000
SHUTDOWN SUPPLY CURRENT (µA)
420
80
MAX4249 TOC15
0.6
PER AMPLIFIER
400
0.375
420
VOUT SWING FROM EITHER SUPPLY (mV)
MAX4249 TOC13
440
6
440
100
0
SUPPLY CURRENT (µA)
RL = 1kΩ
VOUT = 150mV
TO 4.75V
0.376
PER AMPLIFIER
SHDN = VSS
PHASE (DEGREES)
AV (dB)
120
MAX4249 TOC12
460
SUPPLY CURRENT (µA)
RL = 200kΩ
140
125
MAX4249 TOC10
150
SUPPLY CURRENT AND SHUTDOWN
SUPPLY CURRENT vs. TEMPERATURE
LARGE-SIGNAL VOLTAGE GAIN
vs. TEMPERATURE
PSRR-
1
10
100
1k
10k
100k
FREQUENCY (Hz)
_______________________________________________________________________________________
1M
10M
SHUTDOWN SUPPLY CURRENT (µA)
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 = 0, 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
1
AV = +1 (MAX4250–MAX4254)
0.1
1k
10k
100k
1M
10
10M
100
1k
10k
-60
fO
-100
HD2 HD4
VIN
-40
-140
VO
RL
VO
10kΩ
100kΩ
11kΩ
11kΩ
0.1
100kΩ
RL = 1kΩ
-80
HD2
-100
HD5
AV = +10
VIN
fO = 3kHz
FILTER BW = 30kHz
1
fO
-60
10
THD+N (%)
-20
MAX4250–MAX4254
THD PLUS NOISE
vs. OUTPUT VOLTAGE (VDD = 5V)
MAX4249 TOC23
VOUT = 4Vp-p
fO = 1kHz
0
1s/div
100k
20
MAX4249 TOC22
RL = 1k Ω
fO = 1kHz
AV = +1
AMPLITUDE (dBc)
0.01
HD3
RL = 10kΩ
-120
-160
-140
10
5k
10k
15k
20k
5k
15k
10k
20k
0
4
5
MAX4250–MAX4254
THD PLUS NOISE vs.
OUTPUT VOLTAGE SWING (VDD = 3V)
MAX4249/MAX4255/MAX4256/MAX4257
THD PLUS NOISE vs. OUTPUT VOLTAGE SWING
MAX4250–MAX4254
THD PLUS NOISE vs. FREQUENCY
AV = +10
RL
100kΩ
11kΩ
0.1
RL = 1kΩ
VIN
VOUT
THD+N (%)
11kΩ
1
MAX4249 TOC25
RL
1
1
VIN
VOUT
RL
0.1
100kΩ
fO = 20kHz, FILTER BW = 80kHz
R1
AV = +10
VDD = +3V
fO = 3kHz
FILTER BW = 30kHz
1
AV = 10
0.001
RL = 100kΩ
FILTER BW= 22kHz
RL = 10kΩ TO GND
VO = 2Vp-p
AV = 1
fO = 3kHz, FILTER BW = 30kHz
0.001
OUTPUT VOLTAGE (Vp-p)
AV = 100
R1 = 560Ω, R2 = 53kΩ
R1 = 5.6kΩ, R2 = 53kΩ
RL = 10kΩ
2
R2
0.01
0.01
0
3
OUTPUT VOLTAGE (Vp-p)
VOUT
0.001
2
FREQUENCY (Hz)
VIN
0.01
1
FREQUENCY (Hz)
10
0.1
RL = 100kΩ
0.001
10
THD+N (%)
AMPLITUDE (dBc)
Vp-p NOISE = 760nVp-p
0
MAX4249/MAX4255/MAX4256/MAX4257
FFT OF DISTORTION AND NOISE
HD3
THD+N (%)
5
MAX4250–MAX4254
FFT OF DISTORTION AND NOISE
-40
-120
10
FREQUENCY (Hz)
VOUT = 2Vp-p
-80
200nV/
div
15
FREQUENCY (Hz)
0
-20
20
MAX4249 TOC24
10
25
MAX4249 TOC27
100
MAX4249 TOC21
VDD = 3V OR 5V
MAX4249 TOC26
OUTPUT IMPEDANCE (Ω)
AV = +10 (MAX4249/MAX4255/
MAX4256/MAX4257)
0.1Hz TO 10Hzp-p NOISE
30
MAX4249 TOC20
MAX4249 TOC19
1000
Vn-EQUIVALENT INPUT NOISE VOLTAGE (nV/√Hz)
OUTPUT IMPEDANCE
vs. FREQUENCY
3
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 = 0, VCM = VOUT = VDD/2, input noise floor of test equipment =10nV/√Hz for all distortion measurements,
TA = +25°C, unless otherwise noted.)
MAX4250–MAX4254
LARGE-SIGNAL PULSE RESPONSE
MAX4250–MAX4254
THD PLUS NOISE vs. FREQUENCY
FILTER BW = 80kHz
AV = +1
RL = 1kΩ
VOUT = 2Vp-p
MAX4250–MAX4254
SMALL-SIGNAL PULSE RESPONSE
MAX4249 TOC29
MAX4249 TOC28
0.1
THD PLUSE NOISE (%)
MAX4249 TOC30
1.5V
0.6V
VOUT
20mV/
div
0.01
RL TO VDD/2
RL TO GND
VOUT
200mV/
div
RL TO VDD
0.5V
0.001
VDD = +3V
RL = 10kΩ
CL = 100pF
VIN = 1V PULSE
0.5V
VDD = +3V
RL = 10kΩ
CL = 100pF
VIN = 100mV PULSE
0.0001
10
100
1k
2µs/div
10k
2µs/div
FREQUENCY (Hz)
MAX4249/MAX4255/MAX4256/MAX4257
SMALL-SIGNAL PULSE RESPONSE
CHANNEL SEPARATION vs. FREQUENCY
MAX4249 TOC32
MAX4249 TOC31
140
130
2V
1.6V
VOUT
200mV/
div
1V
MAX4249 TOC33
MAX4249/MAX4255/MAX4256/MAX4257
LARGE-SIGNAL PULSE RESPONSE
VDD = +3V
RL = 10kΩ
CL = 100pF
VIN = 100mV PULSE
AV = +10
2µs/div
VOUT
50mV/div
1.5V
VDD = +3V
RL = 10kΩ
CL = 100pF
VIN = 10mV PULSE
AV = +10
2µs/div
CHANNEL SEPARATION (dB)
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)
8
_______________________________________________________________________________________
1M
10M
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
PIN
MAX4250/
MAX4255
MAX4251/
MAX4256
MAX4252/
MAX4257
MAX4252
5 SOT23
8 SO/
µMAX
8 SO/
µMAX
8 UCSP
10
UCSP
A1, A3
A1,
C1
1
6
1, 7
MAX4249/
MAX4253
10
µMAX
1, 9
MAX4254
14 SO
1, 13
NAME
FUNCTION
OUT, OUTA,
OUTB,
OUTC,
OUTD
Amplifier Output
14 SO
1, 7, 8, 14
2
4
4
C2
B4
4
4
11
VSS
Negative
Supply.
Connect to
ground for
single-supply
operation
3
3
3, 5
C1, C3
A3,
C3
3, 5
3, 11
3, 5, 10,
12
IN+, INA+,
INB+, INC+,
IND+
Noninverting
Amplifier Input
4
2
2, 6
B1, B3
A2,
C2
2, 6
2, 12
2, 6, 9, 13
IN-, INA-,
INB-, INC-,
IND-
Inverting
Amplifier Input
5
7
8
A2
B1
8
14
4
VDD
Positive Supply
—
8
—
—
A4,
C4
—
5, 9
—
SHDN,
SHDNA,
SHDNB
—
1, 5
—
—
—
—
5, 7,
8, 10
—
N.C.
—
—
—
B2
B2,
B3
—
—
—
—
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-to-digital 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 ouput operation,
drive loads as low as 1kΩ while maintining DC accuracy, and can drive capactive loads up to 400pF without
Shutdown Input,
Connect to VDD
or leave
unconnected
for normal
operation
(amplifier(s)
enabled).
No Connection.
Not internally
connected.
Not populated
with solder
sphere
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.
Low Distortion
Many factors can affect the noise and distortion that the
device contributes to the input signal. The following
_______________________________________________________________________________________
9
MAX4249–MAX4257
Pin Description
MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
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 mid-supply 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 = 100kΩ
100mV
VIN
50mV/div
0
VOUT
100mV/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).
2µs/div
Figure 2a. Pulse Response with No Feed-Forward
Compensation
100mV
AV = +2
RF = RG = 100kΩ
CZ = 11pF
VIN
50mV/div
0
VOUT
100mV/div
Using a Feed-Forward Compensation
Capacitor, CZ
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.
10
2µs/div
Figure 2b. Pulse Response with 10pF Feed-Forward
Compensation
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
RISO
VOUT
CL
MAX4250
MAX4251
MAX4252
MAX4253
MAX4254
VIN
Figure 3. Overdriven Input Showing No Phase Reversal
AV = +1
4.25V VDD = +5V
RL = 10kΩ
VOUT
0
4.45V
VIN
-200mV
0
CZ = 11 x (RF / RG) [pF]
In the unity-gain stable MAX4250–MAX4254, the use of
a proper CZ is most important for AV = +2V/V, and AV
= -1V/V. In the decompensated MAX4249/MAX4255/
MAX4256/MAX4257, CZ is most important for AV =
+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.
Ground-Sensing and Rail-to-Rail Outputs
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).
20µs/div
Figure 4. Rail-to-Rail Output Operation
AV = +1
4.25V VDD = +5V
RL = 10kΩ
VOUT
0
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
4.45V
VIN
-200mV
0
20µs/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.
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.
______________________________________________________________________________________
11
MAX4249–MAX4257
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:
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
3.5
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
Figure 6. Isolation Resistance vs. Capacitive Loading to
Minimize Peaking (<2dB)
1000
10,000
Figure 8. MAX4250-4254 Unity-Gain Bandwidth vs. Capacitive
Load
imize PC board trace lengths and resistor leads, and
place external components close to the op amp’s pins.
25
MAX4250–MAX4254 (AV = +1)
MAX4249/MAX4255–MAX4257 (AV = +10)
RISO = 0
UCSP Package Consideration
For general UCSP package information and PC layout
considerations, please refer to the Maxim Application
Note (Wafer-Level Ultra-Chip-Board-Scale-Package).
SHADED AREA INDICATES
STABLE OPERATION
WITH NO NEED FOR
ISOLATION RESISTOR.
15
100
NOTE: RISO CHOSEN FOR PEAKING <2dB.
NOTE: USING AN ISOLATION RESISTOR REDUCES PEAKING.
20
10
CAPACITIVE LOAD (pF)
CAPACITIVE LOADING (pF)
10
UCSP Reliability
5
0
10
100
1000
10,000
CAPACITIVE LOAD (pF)
Figure 7. Peaking vs. Capacitive Load
Reference Figure 6 to select a resistance value that will
ensure a load capacitance that limits peaking to <2dB
(25%). 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.
Power Supplies and Layout
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, min12
VDD = 3V
0.5
0
PEAKING (dB)
MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
The chip-scale package (UCSP) represents a unique
packaging form factor that may not perform equally to a
packaged product through traditional mechanical reliability tests. CSP reliability is integrally linked to the
user’s assembly methods, circuit board material, and
usage environment. The user should closely review
these areas when considering use of a CSP package.
Performance through Operating Life Test and Moisture
Resistance remains uncompromised as it is primarily
determined by the wafer-fabrication process.
Mechanical stress performance is a greater consideration for a CSP package. CSPs are attached through
direct solder contact to the user’s PC board, foregoing
the inherent stress relief of a packaged product lead
frame. Solder joint contact integrity must be considered. Table 1 shows the testing done to characterize
the CSP reliability performance. In conclusion, the
UCSP is capable of performing reliably through environmental stresses as indicated by the results in the
table. Additional usage data and recommendations are
detailed in the UCSP application note, which can be
found on Maxim’s website at www.maxim-ic.com.
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
+5V
VDD
50k
2
MAX195
7
6
3
VIN
MAX4256
4
8
(16-BIT ADC)
AIN
DOUT
SHDN
SCLK
SERIAL
INTERFACE
CS
5k
REF
4.096V
VSS
-5V
SHDN
Table 1. Reliability Test Data
CONDITIONS
DURATION
NO. OF FAILURES PER
SAMPLE SIZE
-35°C to +85°C, -40°C to +100°C
150 cycles, 900 cycles
0/10, 0/200
TEST
Temperature Cycle
Operating Life
TA = +70°C
240h
0/10
Moisture Resistance
-20°C to +60°C, 90% RH
240h
0/10
Low-Temperature Storage
-20°C
240h
0/10
Low-Temperature Operational
-10°C
24h
0/10
Solderability
8h steam age
—
0/15
ESD
High-Temperature Operating
Life
±2000V, Human Body Model
—
0/5
168h
0/45
TJ = +150°C
______________________________________________________________________________________
13
MAX4249–MAX4257
Typical Operating Circuit
MAX4249–MAX4257
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
Selector Guide
PART
GAIN
BANDWIDTH
(MHz)
MINIMUM
STABLE
GAIN (V/V)
NO. OF
AMPLIFIERS PER
PACKAGE
SHUTDOWN
MODE
MAX4249
22
10
2
Yes
MAX4250
3
1
1
—
MAX4251
3
1
1
Yes
MAX4252
3
1
2
—
MAX4253
3
1
2
Yes
MAX4254
3
1
4
—
PIN-PACKAGE
10-pin µMAX, 14-pin SO
5-pin SOT23
8-pin µMAX/SO
8-pin µMAX/SO, 8-pin UCSP
10-pin µMAX, 14-pin SO,
10-pin UCSP
14-pin SO
MAX4255
22
10
1
—
MAX4256
22
10
1
Yes
8-pin µMAX/SO
MAX4257
22
10
2
—
8-pin µMAX/SO
Ordering Information (continued)
TEMP. RANGE
PIN/BUMPPACKAGE
MAX4251ESA
-40°C to +85°C
8 SO
—
MAX4251EUA
-40°C to +85°C
8µMAX
—
MAX4252ESA
-40°C to +85°C
8 SO
—
MAX4252EBA-T*
-40°C to +85°C
8 UCSP
AAO
MAX4252EUA
-40°C to +85°C
8 µMAX
—
MAX4253EUB
-40°C to +85°C
10 µMAX
—
MAX4253EBB-T*
-40°C to +85°C
10 UCSP
AAK
MAX4253ESD
-40°C to +85°C
14 SO
—
MAX4254ESD
-40°C to +85°C
14 SO
—
MAX4255EUK-T
-40°C to +85°C
5 SOT23-5
MAX4256ESA
-40°C to +85°C
8 SO
—
MAX4256EUA
-40°C to +85°C
8 µMAX
—
MAX4257ESA
-40°C to +85°C
8 SO
—
MAX4257EUA
-40°C to +85°C
8 µMAX
—
PART
TOP
MARK
5-pin SOT23
Chip Information
TRANSISTOR COUNTS:
MAX4250/MAX4251/MAX4255/MAX4256: 170
MAX4249/MAX4252/MAX4253/MAX4257: 340
MAX4254: 680
ACCJ
*UCSP reliability is integrally linked to the user’s assembly
methods, circuit board material, and environment. Refer to the
UCSP Reliability Notice in the UCSP Reliability section of this
data sheet for more information.
14
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
TOP VIEW
OUT
1
5
N.C. 1
VDD
IN- 2
MAX4250
MAX4255
VSS 2
IN+ 3
IN+
4
MAX4251
MAX4256
3
VSS 4
IN-
INAINA+
10 VDD
2
3
MAX4249
MAX4253
7
VDD
INA- 2
6
OUT
INA+
5
N.C.
OUTA 1
3
9
OUTB
INA-
2
8
INB-
INA+
3
VSS
4
7
INB+
SHDNA
5
6
SHDNB
N.C. 5
MAX4249
MAX4253
VSS 4
VDD
7
OUTB
6
INB-
5
INB+
14 OUTD
OUTA 1
13 OUTB
INA-
2
13 IND-
12 INB-
INA+
3
12 IND+
11 INB+
VDD 4
10 N.C.
INB+ 5
SHDNA 6
9
SHDNB
N.C. 7
8
N.C.
SO
MAX4252
MAX4257
8
µMAX/SO
14 VDD
OUTA 1
VSS 4
µMAX
SHDN
µMAX/SO
SOT23
OUTA 1
8
MAX4254
11 VSS
10 INC+
INB- 6
9
INC-
OUTB 7
8
OUTC
SO
______________________________________________________________________________________
15
MAX4249–MAX4257
Pin Configurations (continued)
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
8LUMAXD.EPS
SOT5L.EPS
MAX4249–MAX4257
Package Information
16
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
10LUMAX.EPS
9LUCSP, 3x3.EPS
______________________________________________________________________________________
17
MAX4249–MAX4257
Package Information (continued)
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
SOICN.EPS
MAX4249–MAX4257
Package Information (continued)
18
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
12L, USPC.EPS
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
MAX4249–MAX4257
Package Information (continued)