View MAX4256_299465.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-1295; Rev 5; 5/03
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps
General Description
The MAX4249-MAX4257 low-noise, low-distortion operational amplifiers offer Rail-to-Rail(R) outputs and singlesupply operation down to 2.4V. They draw 400A 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 0.5A 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 (UCSPTM) and the MAX4253 is available in a 10-bump UCSP.
Features
o Available in Space-Saving UCSP, SOT23, and MAX Packages o Low Distortion: 0.0002% THD (1k load) o 400A 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 10k 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 = 70V IBIAS = 1pA Large-Signal Voltage Gain = 116dB o Low-Power Shutdown Mode Reduces Supply Current to 0.5A Places Outputs in a High-Impedance State o 400pF Capacitive-Load Handling Capability
MAX4249-MAX4257
Applications
Wireless Communications Devices PA Control Portable/Battery-Powered Equipment Medical Instrumentation ADC Buffers Digital Scales/Strain Gauges
PART MAX4249ESD MAX4249EUB MAX4250EUK-T
Ordering Information
TEMP RANGE -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 14 SO 10 MAX 5 SOT23-5 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)
A 1 OUTA 2 VDD 3 A1 OUTB OUTB B1 B INAA2 INBA3 INB+ A4
SHDNB
B4
MAX4252
INB-
VDD C1 C2
MAX4253
C3 INA+
VSS C4
SHDNA
C
INA+
VSS
INB+
OUTA
INA-
UCSP
UCSP
Pin Configurations continued at end of data sheet. Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. UCSP is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 1
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.
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps MAX4249-MAX4257
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 = +70C) 5-Pin SOT23 (derate 7.1mW/C above +70C)...........571mW 8-Bump UCSP (derate 4.7mW/C above +70C)........379mW 8-Pin MAX (derate 4.5mW/C above +70C) ............362mW 8-Pin SO (derate 5.88mW/C above +70C)...............471mW 10-Bump UCSP (derate 6.1mW/C above +70C) ......484mW Note 1: 10-Pin MAX (derate 5.6mW/C above +70C) ...........444mW 14-Pin SO (derate 8.33mW/C above +70C)..............667mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Bump Temperature (soldering) (Note 1) Infrared (15s) ................................................................+220C Vapor Phase (60s) ........................................................+215C
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, paragraph 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 = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Notes 2, 3)
PARAMETER Supply Voltage Range SYMBOL VDD (Note 4) VDD = 3V Quiescent Supply Current Per Amplifier Normal mode IQ VDD = 5V, UCSP only Shutdown mode (SHDN = VSS) (Note 2) Input Offset Voltage (Note 5) Input Offset Voltage Tempco Input Bias Current Input Offset Current Differential Input Resistance Input Common-Mode Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio VOS TCVOS IB IOS RIN VCM CMRR PSRR Guaranteed by CMRR test VSS - 0.2V VCM VDD - 1.1V VDD = 2.4 to 5.5V RL = 10k to VDD/2; VOUT = 25mV to VDD - 4.97V RL = 1k to VDD/2; VOUT = 150V to VDD - 4.75V |VIN+ - VIN-| 10mV RL = 10k to VDD/2 VDD - VOH VOL - VSS -0.2 70 75 80 80 115 100 116 dB 112 8 7 25 20 mV (Note 6) (Note 6) 420 0.5 0.07 0.3 1 1 1000 VDD - 1.1 100 100 655 1.5 0.75 mV V/C pA pA G V dB dB VDD = 5V CONDITIONS MIN 2.4 400 420 575 A TYP MAX 5.5 UNITS V
Large-Signal Voltage Gain
AV
Output Voltage Swing
VOUT
2
_______________________________________________________________________________________
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 = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Notes 2, 3)
PARAMETER Output Voltage Swing Output Short-Circuit Current Output Leakage Current SHDN Logic Low SHDN Logic High SHDN Input Current Input Capacitance Gain-Bandwidth Product GBW MAX4250-MAX4254 MAX4249/MAX4255/MAX4256/MAX4257 Slew Rate Peak-to-Peak Input-Noise Voltage SR MAX4250-MAX4254 MAX4249/MAX4255/MAX4256/MAX4257 enP-P f = 0.1Hz to 10Hz f = 10Hz Input Voltage-Noise Density en f = 1kHz f = 30kHz Input Current-Noise Density in f = 1kHz MAX4250-MAX4254 AV = 1V/V, VOUT = 2VP-P, RL = 1k to GND (Note 7) Total Harmonic Distortion Plus Noise THD+N MAX4249/MAX4255/ MAX4256/MAX4257 AV = 1V/V, VOUT = 2VP-P, RL = 1k to GND (Note 7) No sustained oscillations MAX4250-MAX4254, AV = 1V/V Gain Margin GM MAX4249/MAX4255/MAX4256/MAX4257, AV = 10V/V MAX4250-MAX4254, AV = 1V/V Phase Margin M MAX4249/MAX4255/MAX4256/MAX4257, AV = 10V/V f = 1kHz 0.0012 f = 1kHz f = 20kHz SYMBOL VOUT ISC ILEAK VIL VIH IIL/IIH Shutdown mode (SHDN = VSS), VOUT = VSS to VDD (Note 2) (Note 2) (Note 2) SHDN = VSS = VDD (Note 2) 0.8 X VDD 0.5 11 3 MHz 22 0.3 V/s 2.1 760 27 8.9 7.9 0.5 0.0004 0.006 % fA/Hz nV/Hz nVP-P 1.5 CONDITIONS |VIN+ - VIN-| 10mV, RL = 1k to VDD/2 VDD - VOH VOL - VSS MIN TYP 77 47 68 0.001 1.0 0.2 X VDD MAX 200 100 UNITS mV mA A V V A pF
MAX4249-MAX4257
f = 20kHz
0.007 400 10 dB 12.5 74 degrees 68 pF
Capacitive-Load Stability
_______________________________________________________________________________________
3
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps MAX4249-MAX4257
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 5V, VSS = 0, VCM = 0, VOUT = VDD/2, RL tied to VDD/2, SHDN = VDD, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MAX4250-MAX4254 Settling Time To 0.01%, VOUT = 2V step IVDD = 5% of normal operation VOUT = 2.5V, VOUT settles to 0.1% MAX4249/MAX4255/ MAX4256/MAX4257 MAX4251/MAX4253 MAX4249/MAX4256 MAX4251/MAX4253 MAX4249/MAX4256 MIN TYP 6.7 1.6 0.8 s 1.2 8 s 3.5 6 s s MAX UNITS
Delay Time to Shutdown
tSH
Delay Time to Enable Power-Up Delay Time
tEN tPU
VDD = 0 to 5V step, VOUT stable to 0.1%
Note 2: SHDN is available on the MAX4249/MAX4251/MAX4253/MAX4256 only. Note 3: All device specifications are 100% tested at TA = +25C. 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
_______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps MAX4249-MAX4257
Typical Operating Characteristics
(VDD = 5V, VSS = 0, VCM = VOUT = VDD/2, input noise floor of test equipment =10nV/Hz for all distortion measurements, TA = +25C, unless otherwise noted.)
MAX4251/MAX4256 INPUT OFFSET VOLTAGE DISTRIBUTION
MAX4249-57 TOC01
OFFSET VOLTAGE vs. TEMPERATURE
MAX4249-57 TOC02
35 30 NUMBER OF UNITS 25 20 15 10 5
100 VOS (V) 50 0 -50 -100 -150 -200 -95 -75 -55 -35 -13 7 28 49 69 90 110 131 152 172 192 -250 -40 -20 0 20 40 60 80 TEMPERATURE (C)
INPUT OFFSET VOLTAGE (V)
400 UNITS VCM = 0 TA = +25C
200 150
VCM = 0
150
100 VDD = 3V VDD = 5V
50
0
0
-50 -0.5
0.5
1.5
2.5
3.5
4.5
VOS (V)
INPUT COMMON-MODE VOLTAGE (V)
OUTPUT VOLTAGE vs. OUTPUT LOAD CURRENT
MAX4249-57 TOC04
MAX4249-57 TOC05
0.5 OUTPUT VOLTAGE (V) 0.4 0.3 0.2 0.1 0 0
VDD = 3V OR 5V VDIFF = 10mV VDD - VOH
0.09 0.08 VDD - VOH (V) 0.07
RL = 1k
0.05 0.04 VOL (V) 0.03 0.02
RL = 1k
0.06 0.05 0.04 0.03 0.02 0.01 0
RL = 10k RL = 100k
VOL
0.01 0
RL = 10k RL = 100k
1
2
3
4
5
6
7
8
9
10
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
OUTPUT LOAD CURRENT (mA)
TEMPERATURE (C)
TEMPERATURE (C)
LARGE-SIGNAL VOLTAGE GAIN vs. OUTPUT VOLTAGE SWING
MAX4249-57 TOC07
LARGE-SIGNAL VOLTAGE GAIN vs. OUTPUT VOLTAGE SWING
MAX4249-57 TOC08
130 120
AV (dB)
RL = 200k RL = 20k RL = 2k
130 120
AV (dB)
130 120
AV (dB)
RL = 200k
110 100 90 80 70 60 50 0 50 100 150
110 100 90 80
RL = 20k
RL = 200k
110 100 90
RL = 20k RL = 2k
RL = 2k
80 70
VDD = 3V RL REFERENCED TO GND
70 60 0
VDD = 3V RL REFERENCED TO GND
60 50 0 50 100
VDD = 5V RL REFERENCED TO GND
200
250
VOUT SWING FROM EITHER SUPPLY (mV)
50 100 150 200 250 VOUT SWING FROM EITHER SUPPLY (mV)
150
200
250
VOUT SWING FROM EITHER SUPPLY (mV)
_______________________________________________________________________________________
MAX4249-57 TOC09
140
140
LARGE-SIGNAL VOLTAGE GAIN vs. OUTPUT VOLTAGE SWING
140
MAX4249 -57TOC06
0.6
0.10
OUTPUT VOLTAGE SWING (VOH) vs. TEMPERATURE
0.06
OUTPUT VOLTAGE SWING (VOL) vs. TEMPERATURE
MAX4249-57 TOC03
40
INPUT OFFSET VOLTAGE vs. INPUT COMMON-MODE VOLTAGE
200
250
5
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps MAX4249-MAX4257
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 = +25C, unless otherwise noted.)
LARGE-SIGNAL VOLTAGE GAIN vs. OUTPUT VOLTAGE SWING
MAX4249-57 TOC10
MAX4249-57 TOC11
150 140 130 120
AV (dB) RL = 200k RL = 20k RL = 2k
125
LARGE-SIGNAL VOLTAGE GAIN vs. TEMPERATURE
SUPPLY CURRENT AND SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
460 PER AMPLIFIER 440 SUPPLY CURRENT (A) 420 400 SHDN = VDD 380 360 340 SHDN = VSS 0.374 0.375 SHUTDOWN SUPPLY CURRENT (A)
MAX4249-57 TOC12
0.376
120
RL REFERENCED TO VDD/2 VDD = 5V
100 90 80 70 60 50 0 50 100 150 200 250 VOUT SWING FROM EITHER SUPPLY (mV)
VDD = 5V RL REFERENCED TO GND
AV (dB)
110
115
RL = 100k VOUT = 10mV TO 4.99mV RL = 1k VOUT = 150mV TO 4.75mV RL = 10k VOUT = 20mV TO 4.975mV
110
105
100 -40 -20 0 20 40 60 80 TEMPERATURE (C)
0.373 -40 -20 0 20 40 60 80 TEMPERATURE (C)
SUPPLY CURRENT AND SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE
440 420 SUPPLY CURRENT (A) 400 380 360 340 320 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3 5.5 SUPPLY VOLTAGE (V) SHDN = VDD SHDN = VSS 0.3 0.2 0.1 0
MAX4249-57 TOC13
PER AMPLIFIER
MAX4249-57 TOC14
0.5 0.4
SHUTDOWN SUPPLY CURRENT (A)
160 140 VOS (V) 120 100 80 60
VCM = 0 VOUT = VDD/2 RL REFERENCED TO GND
SUPPLY CURRENT (A)
1000
VDD = 5V
RL = 10k RL = 1k
400
VDD = 3V
RL = 100k 1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
100 0.001
40 0.01 0.1 1 5 OUTPUT VOLTAGE (V) SUPPLY VOLTAGE (V)
MAX4250-MAX4254 GAIN AND PHASE vs. FREQUENCY
60 50 40 30 GAIN (dB) 20 10 0 -10 -20 -30 -40 100 1k 10k 100k 1M FREQUENCY (Hz) PHASE GAIN
MAX4249-57 TOC16
MAX4249/MAX4255/MAX4256/MAX4257 GAIN AND PHASE vs. FREQUENCY
180 144 108 PHASE (DEGREES) 72 36 0 -36 -72 -108 -144 60 50 40 30 GAIN (dB) 20 10 0 -10 -20 -30 -40 100 1k 10k 100k 1M FREQUENCY (Hz) PHASE
MAX4249-57 TOC17
MAX4250-MAX4254 POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
-10 -20 PHASE (DEGREES) -30 PSRR (dB) -40 -50 -60 -70 -80 -90 -100 -110 1 10 100 1k 10k 100k 1M 10M FREQUENCY (Hz) PSRRPSRR+
VDD = 3V, 5V
MAX4249-57 TOC18
VDD = 3V, 5V RL = 50k CL = 20pF AV = 1000
VDD = 3V, 5V RL = 50k CL = 20pF AV = 1000
180 144
0
GAIN
108 72 36 0 -36 -72 -108 -144 -180 10M
-180 10M
6
_______________________________________________________________________________________
MAX4249-57 TOC15
0.6
SUPPLY CURRENT vs. OUTPUT VOLTAGE
2000
INPUT OFFSET VOLTAGE vs. SUPPLY VOLTAGE
180
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps MAX4249-MAX4257
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 = +25C, unless otherwise noted.)
OUTPUT IMPEDANCE vs. FREQUENCY
Vn-EQUIVALENT INPUT NOISE-VOLTAGE (nV/Hz)
AV = 10 (MAX4249/MAX4255/ MAX4256/MAX4257)
MAX4249-57 TOC19
INPUT VOLTAGE-N0ISE DENSITY vs. FREQUENCY
MAX4249-57 TOC20
0.1Hz TO 10HzP-P NOISE
VDD = 3V OR 5V
MAX4249-57 TOC21
1000
30 25 20 15 10 5 0 10 100 1k FREQUENCY (Hz) 10k
OUTPUT IMPEDANCE ()
100
10
200nV/div
1 AV = 1 (MAX4250-MAX4254) 0.1 1k 10k 100k FREQUENCY (Hz) 1M 10M
VP-PNOISE = 760nVP-P 100k 1s/div
MAX4250-MAX4254 FFT OF DISTORTION AND NOISE
MAX4249-57 TOC22
MAX4249/MAX4255/MAX4256/MAX4257 FFT OF DISTORTION AND NOISE
MAX4249-57 TOC23
VOUT = 2VP-P
-20 -40 AMPLITUDE (dBc) -60 -80 -100 -120 -140 -160 10 5k 10k 15k
HD2 HD4 HD3 HD5
RL = 1k fO = 1kHz AV = 1
0 -20 AMPLITUDE (dBc) -40 -60 -80 -100 -120 -140
HD2 HD3
VOUT = 4VP-P fO = 1kHz
AV = 10 VIN fO = 3kHz FILTER BW = 30kHz 11k 100k
VO RL
VIN VO fO 11k 100k 10k
1 THD+N (%)
fO
0.1
RL = 1k
0.01 RL = 10k 0.001 RL = 100k 0 1 2 3 4 5 OUTPUT VOLTAGE (VP-P)
20k
10
5k
10k
15k
20k
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4249-57 TOC25
MAX4249-57 TOC26
VIN 1 11k THD+N (%) 0.1 100k VOUT RL
AV = 10
VIN VOUT RL
VIN VOUT RL
THD+N (%)
THD+N (%)
0.1
11k
100k
0.1
R1 R1 = 560, R2 = 53k
R2 AV = 100 AV = 10
RL = 1k
0.01 R1 = 5.6k, R2 = 53k 0.001 AV = 1
fO = 20kHz, FILTER BW = 80kHz 0.01
0.01 AV = 10 fO = 3kHz FILTER BW = 30kHz 0 1
RL = 10k RL = 100k fO = 3kHz, FILTER BW = 30kHz 0.001 2 3 0 1 2 3 4 5 OUTPUT VOLTAGE (VP-P)
0.001
0.0001 10 100
FILTER BW = 22kHz RL = 10k TO GND VO = 2VP-P 1k 10k FREQUENCY (Hz)
OUTPUT VOLTAGE (VP-P)
_______________________________________________________________________________________
MAX4249-57 TOC27
10
MAX4250-MAX4254 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE SWING (VDD = 3V)
MAX4249/MAX4255/MAX4256/MAX4257 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE SWING
1 1
MAX4250-MAX4254 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX4249-57 TOC24
0
20
10
MAX4250-MAX4254 TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT VOLTAGE (VDD = 5V)
7
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps MAX4249-MAX4257
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 = +25C, unless otherwise noted.)
MAX4250-MAX4254 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX4249-57 TOC28
MAX4250-MAX4254 LARGE-SIGNAL PULSE RESPONSE
MAX4249-57 TOC29
MAX4250-MAX4254 SMALL-SIGNAL PULSE RESPONSE
0.6V
MAX4249-57 TOC30
0.1
FILTER BW = 80kHz AV = 1 RL = 1k VOUT = 2VP-P RL TO VDD/2 RL TO GND
1.5V
0.01 THD+N(%)
VOUT 200mV/div
VOUT 20mV/div
0.001 RL TO VDD 0.5V
VDD = 3V RL = 10k CL = 100pF VIN = 1V PULSE 2s/div
0.5V
VDD = 3V RL = 10k CL = 100pF VIN = 100V PULSE 2s/div
0.0001 10 100 1k 10k FREQUENCY (Hz)
MAX4249/MAX4255/MAX4256/MAX4257 LARGE-SIGNAL PULSE RESPONSE
MAX4249-57 TOC31
MAX4249/MAX4255/MAX4256/MAX4257 SMALL-SIGNAL PULSE RESPONSE
MAX4249-57 TOC32
CHANNEL SEPARATION vs. FREQUENCY
130 CHANNEL SEPARATION (dB) 120 110 100 90 80 70 0 1k 10k 100k FREQUENCY (Hz) 1M 10M
MAX4249-57 TOC33
140
2V
1.6V
VOUT 200mV/div VOUT 50mV/div 1.5V
1V
VDD = 3V RL = 10k CL = 100pF VIN = 100mV PULSE AV = 10 2s/div
VDD = 3V RL = 10k CL = 100pF VIN = 10mV PULSE AV = 10 2s/div
8
_______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps
Pin Description
PIN/BUMP MAX4250/ MAX4255 5-PIN SOT23 1 MAX4251/ MAX4256 8-PIN SO/MAX 6 MAX4252/ MAX4257 8-PIN SO/MAX 1, 7 MAX4252 8-BUMP UCSP A1, A3 10-BUMP UCSP A1, C1 MAX4249/ MAX4253 10-PIN MAX 1, 9 14-PIN SO 1, 13 MAX4254 14-PIN SO 1, 7, 8, 14 OUT, OUTA, OUTB, OUTC, OUTD Amplifier Output NAME FUNCTION
MAX4249-MAX4257
2
4
4
C2
B4
4
4
11
VSS
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). No Connection. Not internally connected. Not populated with solder sphere
3 4 5
3 2 7
3, 5 2, 6 8
C1, C3 B1, B3 A2
A3, C3 A2, C2 B1
3, 5 2, 6 8
3, 11 2, 12 14
3, 5, 10, 12 2, 6, 9, 13 4
IN+, INA+, INB+, INC+, IND+ IN-, INA-, INB-, INC-, INDVDD
--
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-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 1k 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 0.5A and disables the outputs.
_______________________________________________________________________________________
9
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps MAX4249-MAX4257
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 = 10k 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 = 100k, RG = 11k (AV = 10V/V) is en = 15nV/Hz, en can be reduced to 9nV/Hz by choosing RF = 10k, RG = 1.1k (AV = 10V/V), at the expense of greater current consumption and potentially higher distortion. For a gain of 100V/V with RF = 100k, RG = 1.1k, the en is low (9nV/Hz).
2s/div
Figure 2a. Pulse Response with No Feed-Forward Compensation
AV = 2 RF = RG = 100k CZ = 11pF 100mV 50mV/div
VIN
0 100mV/div
VOUT
2s/div
Figure 2b. Pulse Response with 10pF Feed-Forward Compensation
10
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps
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. 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] 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 20k (MAX4250-MAX4254) or greater than 5k (MAX4249/MAX4255/MAX4256/ MAX4257).
MAX4249-MAX4257
RISO VOUT CL VIN
MAX4250 MAX4251 MAX4252 MAX4253 MAX4254
Figure 3. Overdriven Input Showing No Phase Reversal
4.25V
VOUT
0 4.45V
0 AV = 1 VDD = 5V RL = 10k
VIN -200mV
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.
20s/div
Figure 4. Rail-to-Rail Output Operation
Ground-Sensing and Rail-to-Rail Outputs
5V
VOUT 1V/div
0
VDD = 5V RL = 10k 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 10k load, making the devices ideal in low-supply-voltage applications.
Output Loading and Stability
200s/div
Figure 5. Capacitive-Load Driving Circuit
Even with their low quiescent current of 400A, these amplifiers can drive 1k loads while maintaining excellent DC accuracy. Stability while driving heavy capacitive loads is another key feature.
11
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps MAX4249-MAX4257
160 140 UNITY-GAIN BANDWIDTH (MHz) 120
RISO ()
4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 10 100 1000 10,000 10 100 1000 SHADED AREA INDICATES STABLE OPERATION WITH NO NEED FOR ISOLATION RESISTOR.
VDD = 3V
100 80 60 40 20 0 CAPACITIVE LOADING (pF) NOTE: USING AN ISOLATION RESISTOR REDUCES PEAKING. SHADED AREA INDICATES STABLE OPERATION WITH NO NEED FOR ISOLATION RESISTOR.
10,000
CAPACITIVE LOAD (pF) NOTE: RISO CHOSEN FOR PEAKING <2dB.
Figure 6. Isolation Resistance vs. Capacitive Loading to Minimize Peaking (<2dB)
25 MAX4250-MAX4254 (AV = 1) MAX4249/MAX4255-MAX4257 (AV = 10) 20 PEAKING (dB)
RISO = 0
Figure 8. MAX4250-4254 Unity-Gain Bandwidth vs. Capacitive Load
15
SHADED AREA INDICATES STABLE OPERATION WITH NO NEED FOR ISOLATION RESISTOR.
10
supply with a 0.1F 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.
5
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).
0 10 100 1000 10,000 CAPACITIVE LOAD (pF)
UCSP Reliability
The UCSP represents a unique packaging form factor that may not perform equally to a packaged product through traditional mechanical reliability tests. UCSP 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 UCSP. 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 UCSP. UCSPs 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 UCSP 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.
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%). For example, if the capacitive load is 1000pF, the corresponding isolation resistor is 150. 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
12
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps
Typical Operating Circuit
MAX4249-MAX4257
5V
50k 2 7 6 VIN 3 AIN SHDN
VDD
MAX195
(16-BIT ADC)
DOUT SCLK CS REF VSS -5V SHDN 4.096V SERIAL INTERFACE
MAX4256
4 8
5k
Table 1. Reliability Test Data
TEST Temperature Cycle Operating Life Moisture Resistance Low-Temperature Storage Low-Temperature Operational Solderability ESD High-Temperature Operating Life CONDITIONS -35C to +85C, -40C to +100C TA = +70C -20C to +60C, 90% RH -20C -10C 8h steam age 2000V, Human Body Model TJ = +150C DURATION 150 cycles, 900 cycles 240h 240h 240h 24h -- -- 168h NO. OF FAILURES PER SAMPLE SIZE 0/10, 0/200 0/10 0/10 0/10 0/10 0/15 0/5 0/45
______________________________________________________________________________________
13
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps MAX4249-MAX4257
Selector Guide
PART MAX4249 MAX4250 MAX4251 MAX4252 MAX4253 MAX4254 MAX4255 MAX4256 MAX4257 GAIN BANDWIDTH (MHz) 22 3 3 3 3 3 22 22 22 MINIMUM STABLE GAIN (V/V) 10 1 1 1 1 1 10 10 10 NO. OF AMPLIFIERS PER PACKAGE 2 1 1 2 2 4 1 1 2 SHUTDOWN MODE Yes -- Yes -- Yes -- -- Yes -- PIN-PACKAGE 10-pin MAX, 14-pin SO 5-pin SOT23 8-pin MAX/SO 8-pin MAX/SO, 8-bump UCSP 10-pin MAX, 14-pin SO, 10-bump UCSP 14-pin SO 5-pin SOT23 8-pin MAX/SO 8-pin MAX/SO
Ordering Information (continued)
PART MAX4251ESA MAX4251EUA MAX4252EBL-T* MAX4252ESA MAX4252EUA MAX4253EBC-T* MAX4253EUB MAX4253ESD MAX4254ESD MAX4255EUK-T MAX4256ESA MAX4256EUA MAX4257ESA MAX4257EUA TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 8 SO 8 MAX 8 UCSP-8 8 SO 8 MAX 10 UCSP-10 10 MAX 14 SO 14 SO 5 SOT23-5 8 SO 8 MAX 8 SO 8 MAX TOP MARK -- -- AAO -- -- AAK -- -- -- ACCJ -- -- -- --
Chip Information
MAX4250/MAX4251/MAX4255/MAX4256 TRANSISTOR COUNT: 170 MAX4249/MAX4252/MAX4253/MAX4257 TRANSISTOR COUNT: 340 MAX4254 TRANSISTOR COUNT: 680
*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
Pin Configurations (continued)
TOP VIEW
OUT 1 5 VDD N.C. 1 IN- 2 IN+ 4 IN3 8 7 SHDN VDD OUT N.C. OUTA 1 INA- 2 INA+ 3 8 7 VDD OUTB INBINB+
MAX4249-MAX4257
VSS 2
MAX4250 MAX4255
MAX4251 MAX4256
6 5
MAX4252 MAX4257
6 5
IN+ 3
VSS 4
VSS 4
SOT23
MAX/SO
MAX/SO
OUTA 1 INAINA+ VSS SHDNA 2 3 4 5
10 VDD 9 OUTB INBINB+ SHDNB
OUTA 1 INAINA+ 2 3
14 VDD 13 OUTB 12 INB-
OUTA 1 INAINA+ 2 3
14 OUTD 13 IND12 IND+
MAX4249 MAX4253
8 7 6
VSS 4 N.C. 5 SHDNA 6 N.C. 7
MAX4249 MAX4253
11 INB+ 10 N.C. 9 8 SHDNB N.C.
VDD 4 INB+ 5 INB- 6 OUTB 7
MAX4254
11 VSS 10 INC+ 9 8 INCOUTC
MAX
SO
SO
______________________________________________________________________________________
15
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps MAX4249-MAX4257
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
SOT-23 5L .EPS
PACKAGE OUTLINE, SOT-23, 5L
21-0057
E
1 1
4X S
8
8
INCHES DIM A A1 A2 b MIN 0.002 0.030 MAX 0.043 0.006 0.037
MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95
y 0.500.1
E
H
0.60.1
c D e E H L
1
1
0.60.1
S
D
BOTTOM VIEW
0.010 0.014 0.005 0.007 0.116 0.120 0.0256 BSC 0.116 0.120 0.188 0.198 0.016 0.026 6 0 0.0207 BSC
0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0 6 0.5250 BSC
TOP VIEW
A2
A1
A
c e b L
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL DOCUMENT CONTROL NO. REV.
21-0036
1 1
J
16
______________________________________________________________________________________
8LUMAXD.EPS
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps MAX4249-MAX4257
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
e
10
4X S
10
INCHES MAX DIM MIN 0.043 A 0.002 0.006 A1 A2 0.030 0.037 0.116 0.120 D1 D2 0.114 0.118 E1 0.116 0.120 0.118 E2 0.114 0.199 H 0.187 L 0.0157 0.0275 L1 0.037 REF b 0.007 0.0106 e 0.0197 BSC c 0.0035 0.0078 0.0196 REF S 0 6
MILLIMETERS MAX MIN 1.10 0.05 0.15 0.75 0.95 2.95 3.05 3.00 2.89 3.05 2.95 2.89 3.00 4.75 5.05 0.40 0.70 0.940 REF 0.177 0.270 0.500 BSC 0.090 0.200 0.498 REF 0 6
H y 0.500.1 0.60.1
1
1
0.60.1
TOP VIEW
BOTTOM VIEW
D2 GAGE PLANE A2 A b A1 D1
E2
c
E1 L1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, 10L uMAX/uSOP
APPROVAL DOCUMENT CONTROL NO. REV.
21-0061
1 1
9LUCSP, 3x3.EPS
I
PACKAGE OUTLINE, 3x3 UCSP 21-0093 I
1 1
______________________________________________________________________________________
10LUMAX.EPS
17
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps MAX4249-MAX4257
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
SOICN .EPS
INCHES DIM A A1 B C e E H L MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050
MILLIMETERS MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 1.27
N
E
H
VARIATIONS:
1
INCHES
MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC
TOP VIEW
DIM D D D
MIN 0.189 0.337 0.386
MAX 0.197 0.344 0.394
D C
A e B A1
0-8 L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL DOCUMENT CONTROL NO. REV.
21-0041
B
1 1
18
______________________________________________________________________________________
UCSP, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps MAX4249-MAX4257
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
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 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX4256

	To Download MAX4256 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .