MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
General Description
The MAX4245/MAX4246/MAX4247 family of low-cost op
amps offer rail-to-rail inputs and outputs, draw only 320µA
of quiescent current, and operate from a single +2.5V
to +5.5V supply. For additional power conservation, the
MAX4245/MAX4247 offer a low-power shutdown mode
that reduces supply current to 50nA, and puts the amplifiers outputs in a high-impedance state. These devices
are unity-gain stable with a 1MHz gain-bandwidth prod
uct driving capacitive loads up to 470pF.
The MAX4245/MAX4246/MAX4247 family is specified
from -40°C to +125°C, making them suitable for use in
a variety of harsh environments. The MAX4245 single
amplifier is available in ultra-small 6-pin SC70 and spacesaving 6-pin SOT23 packages. The MAX4246 dual
amplifier is available in 8-pin SOT23, SO, and µMAX®
packages. The MAX4247 dual amplifier comes in a tiny
10-pin µMAX package.
Applications
●●
●●
●●
●●
●●
●●
Portable Communications
Single-Supply Zero-Crossing Detectors
Instruments and Terminals
Electronic Ignition Modules
Infrared Receivers
Sensor-Signal Detection
●● Rail-to-Rail Input and Output Voltage Swing
●● 50nA (max) Shutdown Mode (MAX4245/MAX4247)
●● 320µA (typ) Quiescent Current Per Amplifier
●● Single +2.5V to +5.5V Supply Voltage Range
●● 110dB Open-Loop Gain with 2kΩ Load
●● 0.01% THD with 100kΩ Load
●● Unity-Gain Stable up to CLOAD = 470pF
●● No Phase Inversion for Overdriven Inputs
●● Available in Space-Saving Packages
6-Pin SC70 or 6-Pin SOT23 (MAX4245)
8-Pin SOT23/SO or 8-Pin µMAX (MAX4246)
10-Pin µMAX (MAX4247)
Ordering Information
PINPACKAGE
TOP
MARK
PART
TEMP RANGE
MAX4245AXT+T
-40°C to +125°C
6 SC70
MAX4245AUT+T
-40°C to +125°C
6 SOT23
AAUB
MAX4246AKA+T
-40°C to +125°C
8 SOT23
AAIN
MAX4246ASA+T
-40°C to +125°C
8 SO
—
MAX4246AUA+T
-40°C to +125°C
8 µMAX
—
MAX4247AUB+T
-40°C to +125°C
10 µMAX
—
AAZ
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Selector Guide
AMPLIFIERS
PER PACKAGE
SHUTDOWN
MODE
MAX4245AXT
1
Yes
MAX4245AUT
1
Yes
MAX4246AKA
2
No
MAX4246ASA
2
No
MAX4246AUA
2
No
MAX4247AUB
2
Yes
PART
Features
Pin Configurations
TOP VIEW
+
IN+ 1
MAX4245
VSS 2
6 VDD
5 SHDN
IN- 3
4
SC70-6/SOT23-6
OUT
+
OUTA
1
INA-
2
7 OUTB
INA+
3
6 INB-
VSS
4
5 INB+
MAX4246
SOT23-8/µMAX-8
μMAX is a registered trademark of Maxim Integrated Products, Inc.
19-2016; Rev 3; 5/14
Pin Configurations continued at end of datat sheet.
8 VDD
MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
Absolute Maximum Ratings
Power-Supply Voltage (VDD to VSS)........................-0.3V to +6V
All Other Pins................................. (VSS - 0.3V) to (VDD + 0.3V)
Output Short-Circuit Duration
(OUT shorted to VSS or VDD)............................... Continuous
Continuous Power Dissipation (TA = +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
6-Pin SOT23 (derate 8.7mW/°C above +70°C)...........695mW
8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW
8-Pin SOT23 (derate 9.1mW/°C above +70°C)...........727mW
8-Pin µMAX (derate 4.5mW/°C above +70°C).............362mW
10-Pin µMAX (derate 5.6mW/°C above +70°C)...........444mW
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +160°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 = +2.7V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected from OUT to VDD / 2, SHDN_ = VDD (MAX4245/MAX4247 only),
TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current (Per Amplifier)
Supply Current in Shutdown
Input Offset Voltage
Input Bias Current
SYMBOL
TYP
MAX
UNITS
5.5
V
VDD = +2.7V
320
650
VDD = +5.5V
375
700
SHDN_ = VSS (Note 2)
0.05
0.5
µA
VOS
VSS - 0.1V ≤ VCM ≤ VDD + 0.1V
±0.4
±1.5
mV
VDD
IDD
ISHDN_
CONDITIONS
Inferred from PSRR test
MIN
2.5
µA
IB
VSS - 0.1V ≤ VCM ≤ VDD + 0.1V
±10
±50
nA
Input Offset Current
IOS
VSS - 0.1V ≤ VCM ≤ VDD + 0.1V
±1
±6
nA
Input Resistance
RIN
|VIN+ - VIN-| ≤ 10mV
Input Common-Mode Voltage
Range
VCM
Inferred from CMRR test
4000
kΩ
VSS - 0.1
VDD + 0.1
V
Common-Mode Rejection Ratio
CMRR
VSS - 0.1V ≤ VCM ≤ VDD + 0.1V
65
80
dB
Power-Supply Rejection Ratio
PSRR
2.5V ≤ VDD ≤ 5.5V
75
90
dB
Large-Signal Voltage Gain
AV
VSS + 0.05V ≤ VOUT ≤ VDD - 0.05V,
RL = 100kΩ
VSS + 0.2V ≤ VOUT ≤ VDD - 0.2V,
RL = 2kΩ
120
dB
95
110
Output Voltage Swing High
VOH
Specified as
VDD - VOUT
RL = 100kΩ
1
RL = 2kΩ
35
Output Voltage Swing Low
VOL
Specified as
VOUT - VSS
RL = 100kΩ
1
RL = 2kΩ
30
Output Short-Circuit Current
IOUT(SC)
VDD = +5.0V
Output Leakage Current in
Shutdown
IOUT(SH)
Device in Shutdown Mode
(SHDN_ = VSS), VSS ≤ VOUT ≤ VDD
(Note 2)
Sourcing
11
Sinking
30
SHDN_ Logic Low
VIL
(Note 2)
SHDN_ Logic High
VIH
(Note 2)
SHDN_ Input Current
IL/IH
VSS ≤ SHDN_ ≤ VDD (Note 2)
www.maximintegrated.com
60
60
mV
mV
mA
±0.01
±0.5
0.3 x VDD
0.7 x VDD
µA
V
V
0.5
50
nA
Maxim Integrated │ 2
MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
Electrical Characteristics (continued)
(VDD = +2.7V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected from OUT to VDD / 2, SHDN_ = VDD (MAX4245/MAX4247 only),
TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
Gain-Bandwidth Product
CONDITIONS
MIN
GBW
TYP
MAX
UNITS
1.0
MHz
Phase Margin
ΦM
70
degrees
Gain Margin
GM
20
dB
Slew Rate
SR
0.4
V/µs
Input Voltage-Noise Density
en
f = 10kHz
52
nV/√Hz
Input Current-Noise Density
in
f = 10kHz
0.1
pA/√Hz
Capacitive-Load Stability
CLOAD
AV = 1 (Note 3)
470
pF
Shutdown Delay Time
t(SH)
(Note 2)
3
µs
Enable Delay Time
t(EN)
(Note 2)
4
µs
Power-On Time
tON
4
µs
Input Capacitance
CIN
2.5
pF
Total Harmonic Distortion
THD
0.01
%
10
µs
Settling Time to 0.01%
tS
f = 10kHz, VOUT = 2VP-P, AV = +1,
VDD = +5.0V, Load = 100kΩ to VDD/2
VOUT = 4V step, VDD = +5.0V, AV = +1
Electrical Characteristics
(VDD = +2.7V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected from OUT to VDD / 2, SHDN_ = VDD (MAX4245/MAX4247 only),
TA = -40°C to +125°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage Range
VDD
Inferred from PSRR test
Supply Current (Per Amplifier)
IDD
VDD = +2.7V
Supply Current in Shutdown
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
ISHDN_
MIN
TYP
2.5
SHDN_ = VSS (Note 2)
VOS
VSS ≤ VCM ≤ VDD (Note 4)
TCVOS
VSS ≤ VCM ≤ VDD (Note 4)
MAX
UNITS
5.5
V
800
µA
1
µA
±3.0
mV
±2
µV/°C
IB
VSS ≤ VCM ≤ VDD (Note 4)
±100
nA
Input Offset Current
IOS
VSS ≤ VCM ≤ VDD (Note 4)
±10
nA
Input Common-Mode
Voltage Range
VCM
Inferred from CMRR test (Note 4)
VDD
V
VSS
Common-Mode Rejection Ratio
CMRR
VSS ≤ VCM ≤ VDD (Note 4)
60
dB
Power-Supply Rejection Ratio
PSRR
2.5V ≤ VDD ≤ 5.5V
70
dB
VSS + 0.2V ≤ VOUT ≤ VDD - 0.2V,
RL = 2kΩ
85
dB
Large-Signal Voltage Gain
AV
Output Voltage Swing High
VOH
Specified as VDD - VOUT, RL = 2kΩ
90
mV
Output Voltage Swing Low
VOL
Specified as VOUT - VSS, RL = 2kΩ
90
mV
Output Leakage Current in
Shutdown
IOUT
Device in Shutdown Mode (SHDN_ = VSS),
VSS ≤ VOUT ≤ VDD (Note 3)
±1.0
µA
www.maximintegrated.com
(SH)
Maxim Integrated │ 3
MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
Electrical Characteristics (continued)
(VDD = +2.7V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL connected from OUT to VDD / 2, SHDN_ = VDD (MAX4245/MAX4247 only),
TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
SHDN_ Logic Low
CONDITIONS
VIL
(Note 2)
SHDN_ Logic High
VIH
(Note 2)
SHDN_ Input Current
IL/IH
VSS ≤ SHDN_ ≤ VDD (Notes 2, 3)
Note
Note
Note
Note
MIN
TYP
MAX
UNITS
0.3 x VDD
V
0.7 x VDD
V
100
nA
1: Specifications are 100% tested at TA = +25°C. All temperature limits are guaranteed by design.
2: Shutdown mode is only available in MAX4245 and MAX4247.
3: Guaranteed by design, not production tested.
4: For -40°C to +85°C, Input Common-Mode Range is VSS - 0.1V ≤ VCM ≤ VDD + 0.1V.
Typical Operating Characteristics
(VDD = 2.7V, VSS = VCM = 0V, VOUT = VDD / 2, no load, TA = +25°C, unless otherwise noted.)
MAX4245/MAX4247
SHUTDOWN SUPPLY CURRENT
PER AMPLIFIER vs. TEMPERATURE
TA = +85°C
TA = +25°C
TA = -40°C
2.5
3.0
3.5
4.0
4.5
5.0
-40
15
70
0
125
0
0.5
1.0
1.5
2.0
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
TA = +125°C
350
300
TA = +85°C
250
VOS (µV)
400
TA = +25°C
300
200
100
1
2
3
VCM (V)
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4
5
6
150
-10
0
-15
70
TA = +85°C
0
50
TEMPERATURE (°C)
TA = +125°C
5
-5
VDD = 5.5V
15
TA = -40°C
10
200
-40
VDD = 5.5V
15
VDD = 2.5V
100
TA = -40°C
20
2.5
MAX4245 toc06
VCM (V)
500
VOS (mV)
100
TEMPERATURE (°C)
VDD = 5.5V
0
TA = -40°C
VDD (V)
600
0
0
5.5
MAX4245 toc04
2.0
TA = +25°C
300
200
40
250
200
80
IBIAS (nA)
300
TA = +85°C
400
120
MAX4245 toc05
350
160
TA = +125°C
VDD = 2.5V
500
VOS (µV)
400
600
MAX4245 toc02
TA = +125°C
MAX4245 toc01
450
200
ISHDN (nA)
IDD (µA)
500
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX4245 toc03
SUPPLY CURRENT PER AMPLIFIER
vs. SUPPLY VOLTAGE
125
TA = +25°C
0
1
2
3
4
5
6
VCM (V)
Maxim Integrated │ 4
MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
Typical Operating Characteristics
(VDD = 2.7V, VSS = VCM = 0V, VOUT = VDD / 2, no load, TA = +25°C, unless otherwise noted.)
35
8
30
6
25
VDD = 2.5V
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
70
125
OUTPUT SWING LOW
vs. TEMPERATURE
CROSSTALK vs. FREQUENCY
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
-10
-20
15
125
PSRR (dB)
-130
0.001 0.01
0.1
1
10
100 1000 10,000
MAX4245 toc13
0.1
10
RL = 100kΩ
AV = +1
fIN = 1kHz
VDD = 5.0V
0.01
0.001
0.1
0.01
0.0001
100
1000
MAX4245 toc15
1
2
3
OUTPUT VOLTAGE (VP-P)
4
5
90
NO LOAD
60
30
40
-30
20
-40
0.1
-90
PHASE
GAIN
-150
-20
0
10,000
GAIN AND PHASE vs. FREQUENCY
0
0.001
100,000
80
GAIN (dB)
THD + N (%)
1
10
FREQUENCY (kHz)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. AMPLITUDE
10
RL = 100kΩ
AV = +1
VOUT = 2VP-P
VDD = 5.0V
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-100
FREQUENCY (kHz)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. INPUT FREQUENCY
INPUT FREQUENCY (Hz)
-60
-90
70
10,000
-50
-80
TEMPERATURE (°C)
1000
-40
-70
-110
RL = 100kΩ
-40
-90
PHASE (deg)
10
-30
MAX4245 toc14
20
MAX4245 toc12
0
MAX4245 toc11
-50
MAX4245 toc10
RL = 2kΩ
0.0001
100
15
TEMPERATURE (°C)
30
0.1
-40
VOUT (V)
CROSSTALK (dB)
VOUT - VSS (mV)
RL = 100kΩ
VOUT (V)
-70
THD + N (%)
MAX4245 toc09
10
5
40
1
RL = 2kΩ
20
10
2
0
30
15
4
0
VDD = 5.5V
20
40
VDD - VOUT (mV)
40
ISINK (mA)
ISOURCE (mA)
45
10
VDD = 2.5V
MAX4245 toc08
VDD = 5.5V
12
50
MAX4245 toc07
14
OUTPUT SWING HIGH
vs. TEMPERATURE
OUTPUT SINK CURRENT
vs. OUTPUT VOLTAGE
OUTPUT SOURCE CURRENT
vs. OUTPUT VOLTAGE
-210
1
10
100
1000
10,000
-270
FREQUENCY (kHz)
Maxim Integrated │ 5
MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
Typical Operating Characteristics (continued)
(VDD = 2.7V, VSS = VCM = 0V, VOUT = VDD / 2, no load, TA = +25°C, unless otherwise noted.)
MAX4245 toc16
60
30
40
-30
IN
20mV/div
-150
-20
-40
0.1
20mV/div
-90
PHASE
GAIN
0
MAX4245 toc17
90
2kΩ || 470pF
20
SMALL-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
PHASE (deg)
GAIN (dB)
80
GAIN AND PHASE vs. FREQUENCY
-210
1
10
100
1000
10,000
OUT
-270
4µs/div
FREQUENCY (kHz)
SMALL-SIGNAL TRANSIENT
RESPONSE (INVERTING)
LARGE-SIGNAL TRANSIENT
RESPONSE (NONINVERTING)
MAX4245 toc19
MAX4245 toc18
VDD = 5V
IN
2V/div
20mV/div
IN
20mV/div
2V/div
OUT
OUT
4µs/div
40µs/div
LARGE-SIGNAL TRANSIENT
RESPONSE (INVERTING)
MAX4245 toc20
VDD = 5V
IN
2V/div
2V/div
OUT
40µs/div
www.maximintegrated.com
Maxim Integrated │ 6
MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
Pin Description
PIN
NAME
FUNCTION
MAX4245
MAX4246
MAX4247
1
—
—
IN+
Noninverting Input
2
4
4
VSS
Ground or Negative Supply
3
—
—
IN-
Inverting Input
4
—
—
OUT
5
—
—
SHDN
6
8
10
VDD
—
1
1
OUTA
—
2
2
INA-
Inverting Input Channel A
—
3
3
INA+
Noninverting Input Channel A
—
5
7
INB+
Noninverting Input Channel B
—
6
8
INB-
Inverting Input Channel B
—
7
9
OUTB
—
—
5
SHDNA
Shutdown Channel A
—
—
6
SHDNB
Shutdown Channel B
Amplifier Output
Shutdown
Positive Supply
Amplifier Output Channel A
Amplifier Output Channel B
VDD
IN
VDD
R3
R3
R3 = R1 ║R2
R3 = R1 ║R2
R1
R2
IN
R1
R2
Figure 1a. Minimizing Offset Error Due to Input Bias Current
(Noninverting)
Figure 1b. Minimizing Offset Error Due to Input Bias Current
(Inverting)
Detailed Description
Since the input stage consists of NPN and PNP pairs, the
input bias current changes polarity as the common-mode
voltage passes through the crossover region. Match the
effective impedance seen by each input to reduce the
offset error caused by input bias currents flowing through
external source impedance (Figures 1a and 1b).
Rail-to-Rail Input Stage
The MAX4245/MAX4246/MAX4247 have rail-to-rail input
and output stages that are specifically designed for lowvoltage, single-supply operation. The input stage consists
of composite NPN and PNP differential stages, which
operate together to provide a common-mode range
extending to both supply rails. The crossover region
of these two pairs occurs halfway between VDD and
VSS. The input offset voltage is typically ±400µV. Lowoperating supply voltage, low supply current and rail-torail outputs make this family of operational amplifiers an
excellent choice for precision or general-purpose, lowvoltage, battery-powered systems.
www.maximintegrated.com
The combination of high-source impedance plus input
capacitance (amplifier input capacitance plus stray capacitance) creates a parasitic pole that can produce an
underdamped signal response. Reducing input capacitance or placing a small capacitor across the feedback
resistor improves response in this case.
The MAX4245/MAX4246/MAX4247 family’s inputs are
protected from large differential input voltages by internal
5.3kΩ series resistors and back-to-back triple-diode stacks
across the inputs (Figure 2). For differential-input voltages
Maxim Integrated │ 7
MAX4245/MAX4246/
MAX4247
IN-
IN+
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
5.3kΩ
5.3kΩ
IN
2V/div
OUT
2V/div
Figure 2. Input Protection Circuit
much less than 2.1V (triple-diode drop), input resistance is
typically 4MΩ. For differential voltages greater than 2.1V,
input resistance is around 10.6kΩ, and the input bias current can be approximated by the following equation:
400µs/div
Figure 3. Rail-to-Rail Input/Output Voltage Range
IB = (VDIFF - 2.1V)/10.6kΩ
In the region where the differential input voltage approaches 2.1V, the input resistance decreases exponentially
from 4MΩ to 10.6kΩ as the diodes begin to conduct. It follows that the bias current increases with the same curve.
In unity-gain configuration, high slew-rate input signals
may capacitively couple to the output through the triplediode stacks.
2V/div
VDD
Rail-to-Rail Output Stage
The MAX4245/MAX4246/MAX4247 can drive a 2kΩ load
and still typically swing within 35mV of the supply rails.
Figure 3 shows the output voltage swing of the MAX4245
configured with AV = -1V/V.
Applications Information
Power-Supply Considerations
The MAX4245/MAX4246/MAX4247 operate from a single
+2.5V to +5.5V supply (or dual ±1.25V to ±2.75V supplies) and consume only 320µA of supply current per
amplifier. A 90dB power-supply rejection ratio allows the
amplifiers to be powered directly off a decaying battery
voltage, simplifying design and extending battery life.
Power-Up
The MAX4245/MAX4246/MAX4247 output typically settles within 4µs after power-up. Figure 4 shows the output
voltage on power-up and power-down.
Shutdown Mode
The MAX4245/MAX4247 feature a low-power shutdown
mode. When SHDN_ is pulled low, the supply current
drops to 50nA per amplifier, the amplifier is disabled, and
www.maximintegrated.com
2V/div
OUT
10µs/div
Figure 4. Power-Up/Power-Down Waveform
the output enters a high-impedance state. Pulling SHDN_
high enables the amplifier. Figure 5 shows the MAX4245/
MAX4247’s shutdown waveform.
Due to the output leakage currents of three-state devices
and the small internal pullup current for SHDN_, do not
leave SHDN_ open/high-impedance. Leaving SHDN_
open may result in indeterminate logic levels, and could
adversely affect op amp operation. The logic threshold for
SHDN_ is referred to VSS. When using dual supplies, pull
SHDN_ to VSS, not GND, to shut down the op amp.
Driving Capacitive Loads
The MAX4245/MAX4246/MAX4247 are unity-gain stable
for loads up to 470pF. Applications that require greater
capacitive drive capability should use an isolation resistor
Maxim Integrated │ 8
MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
2V/div
SHDN
RISO
IN
OUT
RL
CL
2V/div
Figure 6a. Using a Resistor to Isolate a Capacitive Load from
the Op Amp
OUT
400µs/div
RISO = 0Ω
RL = 2kΩ
CL = 2200pF
Figure 5. Shutdown Waveform
between the output and the capacitive load (Figures 6a, 6b,
6c). Note that this alternative results in a loss of gain accuracy because RISO forms a voltage divider with the RLOAD.
100mV/div
IN
Power-Supply Bypassing and Layout
The MAX4245/MAX4246/MAX4247 family operates from
either a single +2.5V to +5.5V supply or dual ±1.25V to
±2.75V supplies. For single-supply operation, bypass the
power supply with a 100nF capacitor to VSS (in this case
GND). For dual-supply operation, both the VDD and the
VSS supplies should be bypassed to ground with separate
100nF capacitors.
Good PC board layout techniques optimize performance
by decreasing the amount of stray capacitance at the op
amp?s inputs and output. To decrease stray capacitance,
minimize trace lengths and widths by placing external
components as close to the device as possible. Use
surface-mount components when possible.
100mV/div
OUT
10µs/div
Figure 6b. Pulse Response Without Isolating Resistor
RISO = 100Ω
RL = 2kΩ
CL = 2200pF
100mV/div
IN
Pin Configurations (continued)
TOP VIEW
OUTA
1
100mV/div
+
10 VDD
OUT
MAX4247
10µs/div
INA-
2
9 OUTB
INA+
3
8 INB-
Figure 6c. Pulse Response With Isolating Resistor
VSS
4
7 INB+
Chip Information
SHDNA
5
6 SHDNB
PROCESS: BiCMOS
µMAX
www.maximintegrated.com
Maxim Integrated │ 9
MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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 TYPE
PACKAGE CODE
DOCUMENT NO.
LAND PATTERN NO.
6 SOT23
U6+4
21-0058
90-0175
6 SC70
X6SN+1
21-0077
90-0189
8 SOT23
K8+5
21-0078
90-0176
8 SO
S8+4
21-0041
90-0096
8 µMAX
U8+1
21-0036
90-0092
10 µMAX
U10+2
21-0061
90-0330
www.maximintegrated.com
Maxim Integrated │ 10
MAX4245/MAX4246/
MAX4247
Ultra-Small, Rail-to-Rail I/O with Disable,
Single-/Dual-Supply, Low-Power Op Amps
Revision History
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
0
5/01
Initial release
—
2
11/11
Added lead-free data to Ordering Information.
1
3
5/14
Updated the General Description.
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated 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.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2014 Maxim Integrated Products, Inc. │ 11
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