EVALUATION KIT AVAILABLE
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The MAX44244/MAX44245/MAX44248 family of parts provide ultra-precision, low-noise, zero-drift single/quad/ dual operational amplifiers featuring very low-power operation with a wide supply range. The devices incorporate a patented auto-zero circuit that constantly measures and compensates the input offset to eliminate drift over time and temperature as well as the effect of 1/f noise. These devices also feature integrated EMI filters to reduce high-frequency signal demodulation on the output. The op amps operate from either a single 2.7V to 36V supply or dual ±1.35V to ±18V supply. The devices are unity-gain stable with a 1MHz gain-bandwidth product and a low 90µA supply current per amplifier.
The low offset and noise specifications and high supply range make the devices ideal for sensor interfaces and transmitters.
The devices are available in µMAX®, SO, SOT23, and TSSOP packages and are specified over the -40°C to
+125°C automotive operating temperature range.
Sensors Interfaces
4mA to 20mA and 0 to10V Transmitters
PLC Analog I/O Modules
Weight Scales
Portable Medical Devices
Reduces Power for Sensitive Precision Applications
Low 90µA Quiescent Current per Amplifier
Eliminates the Cost of Calibration with Increased Accuracy with Maxim’s Patented Autozero Circuitry
Very Low Input Voltage Offset 7.5µV (max)
Low 30nV/°C Offset Drift (max)
Low Noise Ideal for Sensor Interfaces and Transmitters
50nV/√Hz at 1kHz
0.5µVP-P from 0.1Hz to 10Hz
1MHz Gain-Bandwidth Product
EMI Suppression Circuitry
Rail-to-Rail Output
Wide Supply for High-Voltage Front Ends
2.7V to 36V Supply Range
µMAX, SO, SOT23, TSSOP Packages
Ordering Information appears at end of data sheet.
μMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX6033 REF | VREF |
LP+
R1
R2
MAX5216
DAC
MAX44244
ISIG
(4-20mA)
R3 FLOATING GROUND
RSENSE
LP-
19-6367; Rev 6; 11/18
VDD to VSS............................................................-0.3V to +40V
Common-Mode Input Voltage........ (VSS - 0.3V) to (VDD + 0.3V)
Differential Input Voltage IN_+, IN_- ......................................6V
Continuous Input Current Into Any Pin.............................±20mA
Output Voltage to VSS (OUT_)............... – 0.3V to (VDD + 0.3V)
Output Short-Circuit Duration (OUT_)..................................... 1s
Operating Temperature Range......................... -40°C to +125°C Storage Temperature........................................ -65°C to +150°C
Junction Temperature ......................................................+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.
SO-8
Junction-to-Ambient Thermal Resistance (θJA) ........132°C/W
Junction-to-Case Thermal Resistance (θJC) ...............38°C/W
SO-14
Junction-to-Ambient Thermal Resistance (θJA) ........120°C/W
Junction-to-Case Thermal Resistance (θJC) ...............37°C/W SOT23
Junction-to-Ambient Thermal Resistance (θJA) .....324.3°C/W
Junction-to-Case Thermal Resistance (θJC) ...............82°C/W
TSSOP
Junction-to-Ambient Thermal Resistance (θJA) ........ 110°C/W
Junction-to-Case Thermal Resistance (θJC) ...............30°C/W
µMAX
Junction-to-Ambient Thermal Resistance (θJA) .....206.3°C/W
Junction-to-Case Thermal Resistance (θJC) ...............42°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
(VDD = 10V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values are
at +25°C.) (Note 2)
PARAMETER | SYMBOL | CONDITIONS | MIN TYP MAX | UNITS |
POWER SUPPLY | ||||
Supply Voltage Range | VDD | Guaranteed by PSRR | 2.7 36 | V |
Power-Supply Rejection Ratio (Note 3) | PSRR | TA = +25°C, VIN+ = VIN- = VDD/2 - 1V | 140 148 | dB |
-40°C < TA < +125°C | 133 | |||
Quiescent Current Per Amplifier (MAX4244 Only) | IDD | TA = +25°C | 100 160 | µA |
-40°C < TA < +125°C | 190 | |||
Quiescent Current Per Amplifier (MAX44245/MAX44248 Only) | IDD | TA = +25°C | 90 130 | µA |
-40°C < TA < +125°C | 145 | |||
DC SPECIFICATIONS | ||||
Input Common-Mode Range | VCM | Guaranteed by CMRR test | VSS - VDD - 0.05 1.5 | V |
(VDD = 10V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values are
at +25°C.) (Note 2)
PARAMETER | SYMBOL | CONDITIONS | MIN TYP MAX | UNITS | ||
Common-Mode Rejection Ratio (Note 3) | CMRR | TA = +25°C, VCM = VSS - 0.05V to VDD - 1.5V | 126 130 | dB | ||
-40°C < TA < +125°C, VCM = VSS - 0.05V to VDD - 1.5V | 120 | |||||
Input Offset Voltage (Note 3) | VOS | TA = +25°C | 2 7.5 | µV | ||
-40°C < TA < +125°C | 10 | |||||
Input Offset Voltage Drift (Note 3) | TC VOS | 10 30 | nV/°C | |||
Input Bias Current (Note 3) | IB | TA = +25°C | 150 300 | pA | ||
-40°C < TA < +125°C | 700 | |||||
Input Offset Current (Note 3) | IOS | TA = +25°C | 300 600 | pA | ||
-40°C < TA < +125°C | 1400 | |||||
Open-Loop Gain (Note 3) | AVOL | VSS + 0.5V ≤ VOUT ≤ VDD - 0.5V | TA = +25°C | 140 150 | dB | |
-40°C < TA < +125°C | 135 | |||||
Output Short-Circuit Current | To VDD or VSS, noncontinuous | 40 | mA | |||
Output Voltage Swing | VDD - VOUT | TA = +25°C | 80 | mV | ||
-40°C < TA < +125°C | 110 | |||||
VOUT - VSS | TA = +25°C | 50 | ||||
-40°C < TA < +125°C | 75 | |||||
AC SPECIFICATIONS | ||||||
Input Voltage-Noise Density | eN | f = 1kHz | 50 | nV/√Hz | ||
Input Voltage Noise | 0.1Hz < f < 10Hz | 500 | nVP-P | |||
Input Current-Noise Density | iN | f = 1kHz | 0.1 | pA/√Hz | ||
Gain-Bandwidth Product | GBW | 1 | MHz | |||
Slew Rate | SR | AV = 1V/V, VOUT = 2VP-P | 0.7 | V/µs | ||
Capacitive Loading | CL | No sustained oscillation, AV = 1V/V | 400 | pF | ||
Total Harmonic Distortion Plus Noise | THD+N | VOUT = 2VP-P, AV = +1V/V, f = 1kHz | -100 | dB | ||
EMI Rejection Ratio | EMIRR | VRF_PEAK = 100mV | f = 400MHz | 75 | dB | |
f = 900MHz | 78 | |||||
f = 1800MHz | 80 | |||||
f = 2400MHz | 90 |
(VDD = 30V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values are
at +25°C.) (Note 2)
PARAMETER | SYMBOL | CONDITIONS | MIN | TYP | MAX | UNITS | |
POWER SUPPLY | |||||||
Quiescent Current Per Amplifier (MAX44244 Only) | IDD | TA = +25°C | 100 | 160 | µA | ||
-40°C < TA < +125°C | 190 | ||||||
Quiescent Current Per Amplifier (MAX44245/MAX44248 Only) | IDD | TA = +25°C | 90 | 130 | µA | ||
-40°C < TA < +125°C | 145 | ||||||
DC SPECIFICATIONS | |||||||
Input Common-Mode Range | VCM | Guaranteed by CMRR test | VSS - 0.05 | VDD - 1.5 | V | ||
Common-Mode Rejection Ratio (Note 3) | CMRR | TA = +25°C, VCM = VSS - 0.05V to VDD - 1.5V | 130 | 140 | dB | ||
-40°C < TA < +125°C, VCM = VSS - 0.05V to VDD - 1.5V | 126 | ||||||
Input Offset Voltage (Note 3) | VOS | TA = +25°C | 2 | 7.5 | µV | ||
-40°C < TA < +125°C | 10 | ||||||
Input Offset Voltage Drift (Note 3) | TC VOS | 10 | 30 | nV/°C | |||
Input Bias Current (Note 3) | IB | TA = +25°C | 150 | 300 | pA | ||
-40°C < TA < +125°C | 700 | ||||||
Input Offset Current (Note 3) | IOS | TA = +25°C | 300 | 600 | pA | ||
-40°C < TA < +125°C | 1400 | ||||||
Open-Loop Gain (Note 3) | AVOL | VSS + 0.5V ≤ VOUT ≤ VDD - 0.5V | TA = +25°C | 146 | 150 | dB | |
-40°C < TA < +125°C | 140 | ||||||
Output Short-Circuit Current | To VDD or VSS, noncontinuous | 40 | mA | ||||
Output Voltage Swing | VDD - VOUT | TA = +25°C | 200 | mV | |||
-40°C < TA < +125°C | 270 | ||||||
VOUT - VSS | TA = +25°C | 140 | |||||
-40°C < TA < +125°C | 220 | ||||||
AC SPECIFICATIONS | |||||||
Input Voltage-Noise Density | eN | f = 1kHz | 50 | nV/√Hz | |||
Input Voltage Noise | 0.1Hz < f < 10Hz | 500 | nVP-P | ||||
Input Current-Noise Density | iN | f = 1kHz | 0.1 | pA/√Hz | |||
Gain-Bandwidth Product | GBW | 1 | MHz |
(VDD = 30V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2, TA = -40°C to +125°C, unless otherwise noted. Typical values are
at +25°C.) (Note 2)
PARAMETER | SYMBOL | CONDITIONS | MIN TYP MAX | UNITS | |
Slew Rate | SR | AV = 1V/V, VOUT = 2VP-P | 0.7 | V/µs | |
Capacitive Loading | CL | No sustained oscillation, AV = 1V/V | 400 | pF | |
Total Harmonic Distortion Plus Noise | THD+N | VOUT = 2VP-P, AV = +1V/V, f = 1kHz | -100 | dB | |
EMI Rejection Ratio | EMIRR | VRF_PEAK = 100mV | f = 400MHz | 75 | dB |
f = 900MHz | 78 | ||||
f = 1800MHz | 80 | ||||
f = 2400MHz | 90 |
Note 2: All devices are 100% production tested at TA = +25°C. Temperature limits are guaranteed by design.
Note 3: Guaranteed by design.
Note 4: At IN+ and IN-. Defined as 20log (VRF_PEAK/ΔVOS).
(VDD = 10V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2. Typical values are at TA = +25°C.)
INPUT OFFSET VOLTAGE HISTOGRAM
45
40
35
OCCURANCE (%)
30
25
20
15
10
5
0
INPUT OFFSET VOLTAGE DRIFT
MAX44248 toc01
35
30
OCCURANCE (%)
25
20
15
10
5
0
100
MAX44248 toc02
98
SUPPLY CURRENT (µA)
96
94
92
90
88
86
84
82
80
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX44248 toc03
0 0.5
1.0
1.5
2.0
2.5
3.0
3.5
4 5 6
7 8 9
10 11
12 13 14
0 10
20 30 40
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET VOLTAGE DRIFT (nV/°C)
SUPPLY VOLTAGE (V)
(VDD = 10V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2. Typical values are at TA = +25°C.)
100
98
SUPPLY CURRENT (µA)
96
94
92
90
88
86
84
82
80
SUPPLY CURRENT vs. TEMPERATURE
INPUT OFFSET VOLTAGE vs. COMMON-MODE VOLTAGE
MAX44248 toc04
2
OFFSET VOLTAGE (µV)
1
0
-1
-2
-3
-4
INPUT OFFSET VOLTAGE
VS. TEMPERATURE
MAX44248 toc05
MAX44248 toc06
3
2
OFFSET VOLTAGE (µV)
1
0
-1
-2
-3
-4
-5
-50
-25 0
25 50
75 100
125
-6 -4 -2 0 2 4 6
-50
-25 0 25 50
75 100
125
TEMPERATURE (°C)
INPUT BIAS CURRENT
VS. COMMON-MODE VOLTAGE
180
160
INPUT BIAS CURRENT (pA)
140
120
100
80
60
40
20
0
COMMON-MODE VOLTAGE (V)
800
INPUT BIAS CURRENT (pA)
600
400
200
0
-200
-400
TEMPERATURE (°C)
MAX44248 toc07
MAX44248 toc08
INPUT BIAS CURRENT vs. TEMPERATURE
0 2 4 6
8 10
-50
-25 0
25 50
75 100
125
0
-20
-40
CMRR (dB)
-60
-80
-100
-120
COMMON-MODE VOLTAGE (V)
MAX44248 toc09
COMMON-MODE REJECTION RATIO vs. FREQUENCY
-100
-105
-110
CMRR (dB)
-115
-120
-125
-130
TEMPERATURE (°C)
MAX44248 toc10
COMMON-MODE REJECTION RATIO vs. TEMPERATURE
-140
10
100 1k
10k
100k 1M
-135
-50
-25 0
25 50
75 100
125
FREQUENCY (Hz) TEMPERATURE (°C)
(VDD = 10V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2. Typical values are at TA = +25°C.)
0
-20
-40
PSRR (dB)
-60
-80
-100
-120
-140
-160
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
OUTPUT VOLTAGE HIGH vs. TEMPERATURE
MAX44248 toc11
80
70
VDD - VOUT (mV)
60
50
40
30
20
10
0
OUTPUT VOLTAGE LOW vs. TEMPERATURE
MAX44248 toc12
MAX44248 toc13
60
50
VOUT - VSS (mV)
40
30
20
10
0
10 100 1k
10k
100k 1M
-50
-25 0
25 50
75 100
125
-50
-25 0
25 50
75 100
125
1000
FREQUENCY (Hz)
OUTPUT VOLTAGE HIGH vs. SOURCE CURRENT
TEMPERATURE (°C)
1000
TEMPERATURE (°C)
MAX44248 toc15
OUTPUT VOLTAGE LOW vs. SINK CURRENT
VDD - VOUT (mV)
MAX44248 toc14
VOUT - VSS (mV)
100 100
10 10
1
0.1
1 10
SOURCE CURRENT (mA)
MAX44248 toc16
INPUT VOLTAGE NOISE vs. FREQUENCY
1
0.1
1 10
SINK CURRENT (mA)
0.1Hz TO 10Hz INPUT VOLTAGE PEAK-PEAK NOISE
200
INPUT VOLTAGE NOISE (nV/√Hz)
180
160
140
120
100
80
60
40
20
0
10
100
1k FREQUENCY (Hz)
10k
100k
4s/div
MAX44248 toc17
200nV/div
(VDD = 10V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2. Typical values are at TA = +25°C.)
INPUT CURRENT NOISE vs. FREQUENCY
10
INPUT-CURRENT NOISE (pA/√Hz)
9
8
7
6
5
4
3
2
1
0
SMALL SIGNAL GAIN vs. FREQUENCY
MAX44248 toc18
25
SMALL SIGNAL GAIN (dB)
20
15 GAIN = 11V/V, VOUT = 200mVPP
10
5
0
-5
LARGE SIGNAL GAIN vs. FREQUENCY
MAX44248 toc19
MAX44248 toc20
25
LARGE SIGNAL GAIN (dB)
20
15 GAIN = 11V/V, VOUT = 2VPP
10
5
0
-5
10 100 1k
10k
100k
0.01
0.1 1
10 100
1000
10000
0.01
0.1 1
10 100
1000
10000
FREQUENCY (Hz)
FREQUENCY (kHz)
FREQUENCY (kHz)
SMALL-SIGNAL STEP RESPONSE
MAX44248 toc21
LARGE-SIGNAL STEP RESPONSE
MAX44248 toc22
VIN
100mV/div
VIN
2V/div
VOUT
50mV/div
VOUT
500mV/div
4µs/div 4µs/div
VDD
10V/div
VOUT
2V/div
POWER-UP TIME
MAX44248 toc23
0
-20
-40
THD (dB)
-60
-80
-100
-120
-140
TOTAL HARMONIC DISTORTION vs. FREQUENCY
MAX44248 toc24
RLOAD = 1kΩ
RLOAD = 600Ω
RLOAD = 5kΩ
20µs/div
10 100
1k FREQUENCY (Hz)
10k
100k
(VDD = 10V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 5kΩ to VDD/2. Typical values are at TA = +25°C.)
10k
OUTPUT STABILITY vs. CAPACITIVE LOAD
10k
OUTPUT STABILITY
vs. ISOLATION RESISTANCE
RESISTIVE LOAD (Ω)
MAX44248 toc25
ISOLATION RESISTANCE (Ω)
MAX44248 toc26
1k UNSTABLE 1k
100
10
STABLE
100
10
STABLE
UNSTABLE
1
100
1000
10,000
100,000
1
100
1000
10,000
100,000
MAX44248 toc27
CAPACITIVE LOAD (pF) CAPACITIVE LOAD (pF)
0
-20
CROSSTALK (dB)
-40
-60
-80
-100
-120
-140
-160
CROSSTALK vs. FREQUENCY
1000
OUTPUT IMPEDANCE (Ω)
100
10
1
0.1
OUTPUT IMPEDANCE vs. FREQUENCY
MAX44248 toc28
0.01
0.1 1
10 100
1000
0.01
0.1 1
10 100
1000
FREQUENCY (kHz) FREQUENCY (kHz)
EMIRR vs. FREQUENCY
MAX44248 toc29
120
100
EMIRR (dB)
80
60
40
20
0
10 100
1,000
10,000
FREQUENCY (MHz)
8
TOP VIEW
+
OUTA
VSS
INA+
1
2
3
SOT23
VDD
4
5
MAX44244
INA-
N.C. INA- INA+ VSS
1
2
3
4
5
6
7
+
MAX44244
µMAX
N.C. VDD OUTA N.C.
+ MAX44245 | ||
1 | 14 | |
2 | 13 | |
3 | 12 | |
4 | 11 | |
5 | 10 | |
6 | 9 | |
7 | 8 | |
OUTA | OUTD | |||
INA- | IND- | |||
INA+ | IND+ | |||
VDD | VSS | |||
INB+ | INC+ | |||
INB- | INC- | |||
OUTB | OUTC | |||
TSSOP |
OUTA INA- INA+
VDD INB+ INB-
OUTB
+
2
3
4
1
MAX44245
5
6
7
SO-14
OUTD
14
13 IND-
12 IND+
11 VSS
10 INC+
9 INC-
8 OUTC
OUTA | 1 | + | 8 | VDD |
INA- | 2 | MAX44248 | 7 | OUTB |
INA+ | 3 | 6 | INB- | |
VSS | 4 | 5 | INB+ | |
SO-8 |
OUTA INA- INA+ VSS
1 + 8
2 7
MAX44248
3 6
4 5
µMAX
VDD OUTB INB- INB+
PIN | NAME | FUNCTION | |||||
MAX44244 | MAX44245 | MAX44248 | |||||
SOT23 | µMAX | SO-14 | TSSOP | SO-8 | µMAX | ||
1 | 6 | 1 | 1 | 1 | 1 | OUTA | Channel A Output |
2 | 4 | 11 | 11 | 4 | 4 | VSS | Negative Supply Voltage |
3 | 3 | 3 | 3 | 3 | 3 | INA+ | Channel A Positive Input |
4 | 2 | 2 | 2 | 2 | 2 | INA- | Channel A Negative Input |
5 | 7 | 4 | 4 | 8 | 8 | VDD | Positive Supply Voltage |
— | — | 5 | 5 | 5 | 5 | INB+ | Channel B Positive Input |
— | — | 6 | 6 | 6 | 6 | INB- | Channel B Negative Input |
— | — | 7 | 7 | 7 | 7 | OUTB | Channel B Output |
— | — | 8 | 8 | — | — | OUTC | Channel C Output |
— | — | 9 | 9 | — | — | INC- | Channel C Negative Input |
— | — | 10 | 10 | — | — | INC+ | Channel C Positive Input |
— | — | 12 | 12 | — | — | IND+ | Channel D Positive Input |
— | — | 13 | 13 | — | — | IND- | Channel D Negative Input |
— | — | 14 | 14 | — | — | OUTD | Channel D Output |
— | 1, 5, 8 | — | — | — | — | N.C. | No Connection. Not internally connected. |
The MAX44244/MAX44245/MAX44248 are high-
precision amplifiers with less than 2µV (typ) input-referred offset and low input voltage-noise density at 10Hz. 1/f noise, in fact, is eliminated to improve the performance in low-frequency applications. These characteristics are achieved through an auto-zeroing technique that cancels the input offset voltage and 1/f noise of the amplifier.
External Noise Suppression in EMI Form These devices have input EMI filters to prevent effects of radio frequency interference on the output. The EMI
filters comprise passive devices that present significant higher impedance to higher frequency signals. See the EMIRR vs. Frequency graph in the Typical Operating Characteristics section for details.
High Supply Voltage Range
The devices feature 90µA current consumption per chan- nel and a voltage supply range from either 2.7V to 36V single supply or ±1.35V to ±18V split supply.
The devices feature ultra-high precision operational amplifiers with a high supply voltage range designed for load cell, medical instrumentation, and precision instrument applications.
4–20mA Current-Loop Communication Industrial environments typically have a large amount of broadcast electromagnetic interference (EMI) from high-
voltage transients and switching motors. This combined with long cables for sensor communication leads to high-voltage noise on communication lines. Current-Loop communication is resistant to this noise because the EMI induced current is low. This configuration also allows for low-power sensor applications to be powered from the communication lines.
The Typical Operating Circuit shows how the device can be used to make a current loop driver.
The circuit uses low-power components such as the MAX44244 op amp, the 16-bit MAX5216 DAC, and the high-precision 60µA-only MAX6033 reference. In this circuit, both the DAC and the reference are referred to the local ground. The MAX44244 op-amp inputs are capable of swinging to the negative supply (which is the local ground in this case). R3 acts as a current mirror with
RSENSE. Therefore, if RSENSE = 50Ω (i.e. 20mA will drop 1V) and if the current through R3 is 10μA when IOUT is 20mA (0.05% error) then R3 = 100kΩ. R1 is chosen along with the reference voltage to provide the 4mA offset. R2
= 512kΩ for 20mA full scale or R2 = 614kΩ for 20% over- range. RSENSE is ratiometric with R3, R1 independently sets the offset current and R2 independently sets the
DAC scaling.
Driving High-Performance ADCs
The MAX44244/MAX44245/MAX44248’s low input offset voltage and low noise make these amplifiers ideal for ADC buffering. Weight scale applications require a low- noise, precision amplifier in front of an ADC. Figure 1 details an example of a load cell and amplifier driven from the same 5V supply, along with a 16-bit delta sigma ADC such as the MAX11205.
VDD
MICRO- CONTROLLER
SCK
MISO
The MAX11205 is an ultra-low-power (< 300μA, max active current), high-resolution, serial output ADC. It provides the highest resolution per unit power in the industry and is optimized for applications that require very
high dynamic range with low power such as sensors on a 4–20mA industrial control loop. The devices provide a high-accuracy internal oscillator that requires no external components.
Layout Guidelines
The MAX44244/MAX44245/MAX44248 feature ultra-low input offset voltage and noise. Therefore, to get optimum performance follow the layout guidelines.
Avoid temperature tradients at the junction of two dissimilar metals. The most common dissimilar metals used on a PCB are solder-to-component lead and solder-to-board trace. Dissimilar metals create a local thermocouple. A variation in temperature across the board can cause an additional offset due to Seebeck effect at the solder junctions. To minimize the Seebeck effect, place the amplifier away from potential heat sources on the board, if possible. Orient the resistors such that both the ends are heated equally. It is a good practice to match the input signal path to ensure that the type and number of thermoelectric juntions remain the same. For example, consider using dummy 0Ω resistors oriented in such a way that the thermoelectric source, due to the real resistors in the signal path, are cancelled. It is recommended to flood the PCB with ground plane. The ground plane ensures that heat is distributed uniformly reducing the potential offset voltage degradation due to Seebeck effect.
½ MAX44248
5V
AMP A
5V
RF
VIN+
VDD
SCLK
AMP B
VSS
½ MAX44248
RDY/DOUT MAX11205
VSS
5V
VIN-
RF
RG
Figure 1. Weight Application
PROCESS: BiCMOS
PART | TEMP RANGE | PIN- PACKAGE | TOP MARK |
MAX44244AUK+ | -40°C to +125°C | 5 SOT23 | AFMR |
MAX44244AUA+ | -40°C to +125°C | 8 µMAX | — |
MAX44245ASD+ | -40°C to +125°C | 14 SO | — |
MAX44245AUD+ | -40°C to +125°C | 14 TSSOP | — |
MAX44248AUA+ | -40°C to +125°C | 8 µMAX | — |
MAX44248ASA+ | -40°C to +125°C | 8 SO | — |
+Denotes a lead(Pb)-free/RoHS-compliant package.
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 | OUTLINE NO. | LAND PATTERN NO. |
5 SOT23 | U5+1 | ||
8 SO | S8+4 | ||
8 µMAX | U8+1 | ||
14 SO | S14M+4 | ||
14 TSSOP | U14M+1 |
REVISION NUMBER | REVISION DATE | DESCRIPTION | PAGES CHANGED |
0 | 7/12 | Initial release | — |
1 | 6/13 | Added the MAX44244/MAX44245 to data sheet. Updated the Electrical Characteristics, Absolute Maximum Ratings, Pin Description, and Pin Configurations. | 1–13 |
2 | 9/13 | Released the MAX44244 for introduction. Revised the Electrical Characteristics | 2–5, 13 |
3 | 6/14 | Corrected Figure 1 and Package Information | 12, 13 |
4 | 12/14 | Updated Benefits and Features section | 1 |
5 | 9/15 | Updated Typical Operating Circuit | 1 |
6 | 11/18 | Updated Typical Operating Chracteristics | 7–9 |
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.
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