MAX40018ATA+ [MAXIM]
Dual nanoPower Op Amps in Tiny WLP and TDFN Packages;
| 型号： | MAX40018ATA+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Dual nanoPower Op Amps in Tiny WLP and TDFN Packages |
| 文件： | 总13页 (文件大小：528K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
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MAX40018
Dual nanoPower Op Amps
in Tiny WLP and TDFN Packages
General Description
Benefits and Features
● Ultra-Low Power Preserves Battery Life
The MAX40018 is a dual operational amplifier that
consumes only 400nA supply current (per channel). At
such low power consumption, the device is ideal for
battery-powered applications such as portable medical
equipment, portable instruments and wireless handsets.
• 400nA Typical Supply Current (Per Channel)
● Single 1.7V to 5.5V Supply Voltage Range
• The Device Can be Powered From the Same
1.8V/2.5V/3.3V/5V System Rails
The MAX40018 operates from a single 1.7V to 5.5V
supply, allowing the device to be powered by the same
1.8V, 2.5V, or 3.3V nominal supply that powers the
microcontroller. The MAX40018 features rail-to-rail
outputs and is unity-gain stable with a 9kHz gain bandwidth
product (GBP).
● Tiny Packages Save Board Space
• 1.63mm x 0.91mm x 0.5mm WLP-8 with 0.4mm
Bump Pitch
• 3mm x 3mm x 0.75mm TDFN-8 Package
● Precision Specifications for Buffer/Filter/Gain Stages
• Low 350μV Input Offset Voltage
• Rail-to-Rail Output Voltage
• 9kHz GBP
The ultra-low supply current, ultra-low input bias current,
low operating voltage, and rail-to-rail output capabilities
makethisdualoperationalamplifieridealforusewithsingle
lithium-ion (Li+), or two-cell NiCd or alkaline batteries.
• Low 0.1pA Input Bias Current
• Unity-Gain Stable
The MAX40018 is available in a tiny, 8-bump, 1.63mm x
0.91mm wafer-level package (WLP), with a bump pitch
of 0.4mm, as well as in an 8-pin 3mm x 3mm TDFN
package. The device is specified over the -40°C to
+125°C, automotive temperature range.
● -40°C to +125°C Temperature Range
Ordering Information appears at end of data sheet.
Simplified Block Diagram
Applications
● Wearable Devices
V
DD
● Handheld Devices
● Notebook and Tablet Computers
● Portable Medical Devices
● Portable Instrumentation
IN1+
IN1-
OUT1
OUT2
IN2+
IN2-
MAX40018
V
SS
19-100227; Rev 3; 11/19
MAX40018
Dual nanoPower Op Amps
in Tiny WLP and TDFN Packages
Absolute Maximum Ratings
V
to V ..............................................................-0.3V to +6V
Continuous Power Dissipation (T = +70°C; TDFN-8,
A
DD
SS
OUT_ to V ......................................V - 0.3V to V
+ 0.3V
+ 0.3V
derate 24.4mW/°C above +70°C)...........................1951.2mW
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
Reflow Soldering Peak Temperature (Pb-free) ...............+260°C
SS
SS
DD
IN_+, IN_- to V ...............................V - 0.3V to V
SS
SS
DD
IN_+ to IN_-...........................................................................±2V
Continuous Current Into Any Input Pin.............................±10mA
Continuous Current Into Any Output Pin..........................±20mA
Output Short-Circuit Duration to V
or V ........................ 10s
DD
SS
Continuous Power Dissipation (T = +70°C; 8-Bump WLP,
A
derate 11.4mW/°C above +70°C)................................912mW
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.
Package Information
TDFN-8
PACKAGE CODE
T833+2
Outline Number
21-0137
90-0059
Land Pattern Number
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
)
41°C/W
8°C/W
JA
Junction to Case (θ
)
JC
WLP-8
PACKAGE CODE
N80B1+1
Outline Number
21-100228
Land Pattern Number
Refer to Application Note 1891
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
)
87.71°C/W
N/A
JA
Junction to Case (θ
)
JC
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 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.
Electrical Characteristics
(V
= +3V, V = 0V, V
SS
= 0.5V, V
= V /2, R = 1MΩ to V /2, T = +25°C, unless otherwise noted (Note 1).)
DD
CM
OUT DD L DD A
PARAMETER
SYMBOL
CONDITIONS
Guaranteed by PSRR tests
MIN
TYP
MAX
5.5
UNITS
Supply Voltage Range
V
1.7
V
DD
T
T
T
= +25°C
0.8
1.3
A
A
A
Supply Current (Dual)
I
= -40°C to +85°C
= -40°C to +125°C
1.4
μA
DD
1.6
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MAX40018
Dual nanoPower Op Amps
in Tiny WLP and TDFN Packages
Electrical Characteristics (continued)
(V
= +3V, V = 0V, V
= 0.5V, V
= V /2, R = 1MΩ to V /2, T = +25°C, unless otherwise noted (Note 1).)
DD
SS
CM
OUT DD L DD A
PARAMETER
SYMBOL
CONDITIONS
= +25°C, V - 0.1V < V
MIN
TYP
MAX
UNITS
T
T
V
< V - 1.1V
±0.35
±1.3
A
SS
CM
DD
Input Offset Voltage
Input Offset Drift
V
mV
= -40°C to +125°C, V - 0.1V < V
<
OS
A
SS
CM
±9
88
- 1.1V
DD
6.2
0.1
μV/°C
T
T
T
T
= +25°C
A
A
A
A
Input Bias Current (Note 2)
I
pA
B
= -40°C to +125°C
= +25°C
200
60
0.1
3
Input Offset Current (Note 2)
I
pA
OS
= -40°C to +125°C
Input Capacitance
Either input, over entire CMVR
Guaranteed by CMRR tests
pF
V
Common Mode Voltage Range
CMVR
CMRR
V
- 0.1
V
- 1.1
DD
SS
DC, (V - 0.1V) ≤ V
≤ (V - 1.1V)
DD
70
67
75
95
48
88
35
110
2.2
19.3
2.2
20
8
SS
CM
Common Mode Rejection Ratio
dB
AC, 100mV 1kHz, with output at V /2
PP
DD
DC, 1.7V ≤ V
≤ 5.5V
DD
Power Supply Rejection Ratio
PSRR
dB
dB
AC, 100mV 1kHz, superimposed on V
PP
DD
Open Loop Gain
A
R = 1MΩ, V
= +50mV to V
- 50mV
VOL
L
OUT
DD
R = 100kΩ to V /2
8
Swing high specified
as V - V
L
DD
V
OH
R = 10kΩ to V /2
70
8
DD
OUT
L
DD
Output Voltage Swing
mV
R = 100kΩ to V /2
Swing low specified
as V - V
L
DD
V
OL
R = 10kΩ to V /2
70
OUT
SS
L
DD
Shorted to V (sourcing)
SS
Output Short-Circuit Current
mA
Shorted to V
(sinking)
8
DD
Gain Bandwidth Product
Phase Margin
GBP
φM
A
= 1V/V , C = 20pF
9
kHz
°
V
L
C = 20pF
64
6.4
L
Slew Rate
SR
V
= 1V step, A = 1V/V
V/ms
OUT
PP
V
100mV step, A = 1V/V, C = 20pF,
0.1% settling
V
L
Settling Time
165
µs
Input Voltage Noise Density
Noise Voltage
e
f = 1kHz
730
7
nV/√Hz
N
From 0.1Hz to 10Hz
μV
RMS
Power-On Time
t
Output reaches 1% of final value
0.39
30
ms
pF
dB
ON
Stable Capacitive Load
Crosstalk
C
No sustained oscillations
L
IN1+, 100mV , f = 1kHz, test VOUT2
78
PP
Note 1: Limits are 100% tested at T = +25°C. Limits over the temperature range and relevant supply voltage range are guaranteed
A
by design and characterization.
Note 2: Guaranteed by design.
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MAX40018
Dual nanoPower Op Amps
in Tiny WLP and TDFN Packages
Typical Operating Characteristics
(V
= +3.0V, V = 0V, V
= 0.5V, V
= V /2, R = 1MΩ to V /2, T = +25°C, unless otherwise noted.)
DD
SS
CM
OUT DD L DD A
INPUT OFFSET VOLTAGE vs. INPUT COMMON
INPUT OFFSET VOLTAGE vs. INPUT COMMON
TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MODE VOLTAGE–CHANNEL B
MODE VOLTAGE–CHANNEL A
toc02B
toc01
toc02A
800
600
400
200
0
1300
3000
2500
2000
1500
1000
500
VDD = 3.0V
VDD = 3.0V
TA = +125°C
TA = +125°C
1200
1100
1000
900
TA = +125°C
TA = +85°C
TA =+85°C
TA = +85°C
0
TA = 25°C
-200
-400
-600
-800
TA = +25°C
TA = -40°C
800
TA = +25°C
TA = -40°C
-500
-1000
-1500
-2000
-2500
700
600
TA = -40°C
500
-0.1
0.2
0.5
0.8
1.1
1.4
1.7
2
1.7 2.2 2.7 3.2 3.7 4.2 4.7 5.2
SUPPLY VOLTAGE (V)
-0.1
0.2
0.5
0.8
1.1
1.4
1.7
2
INPUT COMMON MODE VOLTAGE (V)
INPUT COMMON MODE VOLTAGE (V)
INPUT BIAS CURRENT
vs. INPUT COMMON MODE VOLTAGE
INPUT OFFSET CURRENT
vs. INPUT COMMON MODE VOTLAGE
DC CMRR vs. TEMPERATURE
toc04
toc03B
toc03A
120
110
100
90
100
10
1000
100
10
VDD = 3.0V
VDD = 3.0V
VDD = 5.5V
TA = +125°C
TA = +125°C
TA = +85°C
TA = +85°C
1
VDD = 3V
1
TA = +25°C
VDD = 1.7V
80
0.1
0.01
0.1
0.01
70
TA = -40°C
TA = -40°C
TA = +25°C
1.1
60
-50
0
50
100
150
-0.1
0.2
0.5
0.8
1.4
1.7
2
-0.1
0.2
0.5
0.8
1.1
1.4
1.7
2
TEMPERATURE (°C)
INPUT COMMON MODE VOLTAGE (V)
INPUT COMMON MODE VOLTAGE (V)
OUTPUT VOLTAGE LOW
vs. OUTPUT SINK CURRENT
OUTPUT VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
DC PSRR vs. TEMPERATURE
toc05
toc06
toc07
100
95
90
85
80
75
200
150
100
50
200
150
100
50
VDD = 3.0V
VDD = 3.0V
CHA
TA = +125°C
TA = +125°C
CHB
TA =+25°C
TA =+25°C
TA = -40°C
600
TA = -40°C
VDD = 1.7V TO 5.5V
100
0
0
-50
0
50
150
0
200
400
800
1000
0
200
400
600
800
1000
TEMPERATURE (°C)
OUTPUT SOURCE CURRENT ( A)
OUTPUT SINK CURRENT ( A)
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MAX40018
Dual nanoPower Op Amps
in Tiny WLP and TDFN Packages
Typical Operating Characteristics (continued)
(V
= +3.0V, V = 0V, V
= 0.5V, V
= V /2, R = 1MΩ to V /2, T = +25°C, unless otherwise noted.)
DD
SS
CM
OUT DD L DD A
SMALL SIGNAL RESPONSE
vs. FREQUENCY
SMALL SIGNAL RESPONSE
vs. FREQUENCY
toc08A
toc08B
5
0
45
0
5
0
45
0
-5
-45
-90
-5
-45
MAGNITUDE
MAGNITUDE
-10
-15
-20
-25
-30
-10
-15
-20
-25
-30
-35
-40
-90
-135
-180
-225
-270
-315
-360
-135
-180
-225
-270
-315
-360
PHASE
PHASE
VIN = 100mVp-p
RLOAD = 1MΩ
LOAD = 10pF
VIN = 100mVp-p
RLOAD = 100kΩ
LOAD = 10pF
-35
-40
C
C
10
100
1000
10000
100000
10
100
1000
FREQUENCY (Hz)
10000
100000
FREQUENCY (Hz)
LARGE SIGNAL RESPONSE
vs. FREQUENCY
LARGE SIGNAL RESPONSE
vs. FREQUENCY
toc09a
toc09B
5
0
45
5
0
45
0
0
-5
-45
-5
-45
MAGNITUDE
MAGNITUDE
-10
-15
-20
-25
-30
-35
-40
-90
-10
-15
-20
-25
-30
-35
-40
-90
-135
-180
-225
-270
-315
-360
-135
-180
-225
-270
-315
-360
PHASE
PHASE
VIN = 1Vp-p
RLOAD = 1MΩ
LOAD = 10pF
VIN = 1Vp-p
RLOAD = 100kΩ
LOAD = 10pF
C
C
10
100
1000
10000
100000
10
100
1000
10000
100000
FREQUENCY (Hz)
FREQUENCY (Hz)
INPUT VOLTAGE NOISE DENSITY
vs. FREQUENCY
toc12
AC CMRR vs. FREQUENCY
AC PSRR vs. FREQUENCY
toc010
toc011
140
120
100
80
90
80
70
60
50
40
30
20
10
0
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
VIN_CM = 100mVp-p
AV = 1V/V
VDD = 3V 100mVp-p
AV = 1V/V
60
40
20
0
0
1
0.001
0.01
0.1
1
10
100
0.01
0.1
1
10
100
10
100
1000
10000
INPUT FREQUENCY (kHz)
INPUT FREQUENCY (kHz)
FREQUENCY (Hz)
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MAX40018
Dual nanoPower Op Amps
in Tiny WLP and TDFN Packages
Typical Operating Characteristics (continued)
(V
= +3.0V, V = 0V, V
= 0.5V, V
= V /2, R = 1MΩ to V /2, T = +25°C, unless otherwise noted.)
DD
SS
CM
OUT DD L DD A
RESISTIVE LOAD vs. CAPACITIVE LOAD
0.1 TO 10 Hz INTEGRATED NOISE
CROSSTALK vs. FREQUENCY
toc14
toc15
toc13
20
100000
10000
1000
100
50
VIN = 100mVp-p
AV = 1V/V
40
30
0
-20
UNSTABLE
20
10
-40
0
-60
-10
-20
-30
-40
-50
STABLE
-80
-100
-120
VIN = 100mVp-p
AV = 1V/V
10
0.01
0.1
1
10
100
1
10
100
1000
10000
2s/div
INPUT FREQUENCY (kHz)
RESISTIVE LOAD (k
)
SMALL SIGNAL STEP RESPONSE vs. TIME
SMALL SIGNAL STEP RESPONSE vs. TIME
toc17
50mV/div
AC-
50mV/div
AC-
VIN
VIN
COUPLED
COUPLED
VOUT
50mV/div
AC-
COUPLED
VOUT
50mV/div
AC-
COUPLED
CLOAD = 30pF
100 s/div
CLOAD = 15pF
100 s/div
LARGE SIGNAL STEP RESPONSE vs. TIME
POWER UP RESPONSE vs. TIME
LARGE SIGNAL STEP RESPONSE vs. TIME
toc20
toc18
toc19
500mV/di
500mV/div
AC-
COUPLED
1V/div
AC-
COUPLED
v
VIN
VIN
VDD
AC-
COUPLED
VOUT
500mV/div
VOUT
VOUT
500mV/div
250mV/div
AC-
AC-
AC-
COUPLED
COUPLED
COUPLED
CLOAD = 15pF
CLOAD = 30pF
VIN = 100mV
100 s/div
100 s/div
200 s/div
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MAX40018
Dual nanoPower Op Amps
in Tiny WLP and TDFN Packages
Pin Configuration
TOP VIEW
MAX40018
1
2
3
4
+
A
B
OUT1
IN1-
IN1+
V
SS
OUT2
IN2-
IN2+
V
DD
THIN WLP-8
BUMP PITCH = 0.4mm HEIGHT = 0.5mm
TOP VIEW
8
7
6
1
2
3
4
V
OUT1
DD
MAX40018
OUT2
IN2-
IN1-
IN1+
IN2+
5
V
SS
3mm x 3mm x 0.75mm TDFN
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MAX40018
Dual nanoPower Op Amps
in Tiny WLP and TDFN Packages
Pin Description
PIN
NAME
FUNCTION
WLP
A1
A2
A3
A4
B1
B2
B3
B4
TDFN
1
2
OUT1
IN1-
Amplifier 1 Output
Inverting Input, Channel 1
Noninverting Input, Channel 1
3
IN1+
4
V
Negative Power Supply Input. Connect V to 0V in single-supply application.
SS
SS
8
V
Positive Power Supply Input
Amplifier 2 Output
DD
7
OUT2
IN2-
IN2+
EP
6
Inverting Input, Channel 2
Noninverting Input, Channel 2
5
—
Exposed Pad. Connect EP to V or leave unconnected.
SS
Ground Sensing Inputs
Detailed Description
The common-mode voltage range of the MAX40018
extends down to V - 0.1V, and offers excellent
The MAX40018 is a dual operational amplifier that draws
just 400nA supply current (typical, per channel). It is
ideal for battery-powered applications, such as portable
medical equipment, portable instruments, and wireless
handsets. The amplifiers feature rail-to-rail outputs and
are unity-gain stable with a 9kHz GBP. The ultra-low
supply current, ultra-low input bias current, low operating
voltage, and rail-to-rail output capabilities make this dual
operational amplifier ideal for use with single lithium-ion
(Li+), or two-cell NiCd or alkaline batteries.
SS
common-mode rejection. This feature allows input
voltage below ground in a single power supply application,
where ground sensing is very common. This op amp is
also guaranteed not to exhibit phase reversal when either
input is overdriven.
Rail-To-Rail Outputs
The outputs of the MAX40018 dual op amps are guaranteed
to swing within 8mV of the power supply rails with a
100kΩ load.
Power Supplies and PCB Layout
The MAX40018 operates from a single +1.7V to +5.5V
power supply, or dual ±0.85V to ±2.75V power supplies.
Bypass the power supplies with a 0.1μF ceramic capacitor
ESD Protection
The MAX40018 input and output pins are protected
against electrical discharge (ESD) with dedicated diodes
as shown in the Simplified Block Diagram. Caution must
be used when input voltages are beyond the power rails.
Also, the maximum current in or out of any input pin
as shown in the Absolute Maximum Ratings must be
observed.
placed close to V
and V pins. Adding a solid ground
DD
SS
plane improves performance generally by decreasing
the noise at the op amp’s inputs. However, in very high
impedance circuits, it may be worth removing the ground
plane under the IN_- pins to reduce the stray capacitance
and help avoid reducing the phase margin. To further
decrease stray capacitance, minimize PCB trace lengths
and resistor and capacitor leads, and place external
components close to the amplifier’s pins.
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MAX40018
Dual nanoPower Op Amps
in Tiny WLP and TDFN Packages
Stability
Capacitive Load Stability
The MAX40018 maintains stability in its minimum gain
configuration while driving capacitive loads up to 30pF or
so. Larger capacitive loading is achieved using the tech-
niques described in the Capacitive Load Stability section
below. Although this amplifier is primarily designed for low
frequency applications, good layout can still be extremely
important, especially if very high value resistors are being
used, as is likely in ultra-low-power circuitry. However,
some stray capacitance may be unavoidable; and it may
be necessary to add a 2pF to 10pF capacitor across the
feedback resistor, as shown in Figure 1. Select the smallest
capacitor value that ensures stability so that BW and
settling time are not significantly impacted.
Driving large capacitive loads can cause instability in
amplifiers. The MAX40018 is stable with capacitive loads
up to 30pF. Stability with higher capacitive loads can
be achieved by adding a resistive load in parallel with
the capacitive load, as shown in Figure 2. This resistor
improves the circuit’s phase margin by reducing the effective
bandwidth of the amplifier. The graph in the Typical
Operating Characteristics gives the stable operation
region for capacitive load versus resistive load.
V
DD
IN1+
IN1-
V
DD
OUT1
IN1+
IN1-
1/2 MAX40018
OUT1
1/2 MAX40018
R1
C
R
L
L
R2
2pF TO 10pF
Figure 1. Compensation for Feedback Node Capacitance
Figure 2. RL Improving Capacitive Load Drive Capability of Op
Amp
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MAX40018
Dual nanoPower Op Amps
in Tiny WLP and TDFN Packages
Motion Detection Application Circuit
Applications Information
Figure 4 shows a human motion detection circuit using
the MAX40018 dual op amp.
Optimizing for Ultra-Low-Power Applications
The MAX40018 is designed for ultra-low-power applications.
To reduce the power consumption in the application
circuits, use impedance as large as the performance
allows. For example, choose low leakage ceramic capacitors
and high-value resistors. If moisture in high-value resistors
causes stray capacitance or current leakage, use special
coating process to reduce the leakage.
The motion sensor is a Murata IRA-S210ST0 pyroelectric
passiveinfrared(PIR)sensorwithatypicalresponsivity(RV)
of 4.6mV . With a power supply of 3.3V, the PIR sensor
PP
output is biased around 1.0V. Since we are interested
in human motion, the frequency range of interest is set to
0.5 Hz to 7 Hz.
The first stage amplifies the PIR sensor output. The high
frequency noise is filtered by R3 and C3 feedback filter,
General Purpose Active Filters
Figure 3 shows an active band-pass filter implemented
with the MAX40018. Set the operating point based on
the power supply voltage and the input signal range. Pay
attention that the common mode input range is from -0.1V
with a cutoff frequency f
= 1/(2 x π x R3 x C3) = 7Hz.
HIGH1
The low frequency noise is filtered by the R1 and C1 high
pass filter, with a cutoff frequency f = 1/(2 x π x R1
LOW1
x C1) = 0.5 Hz. The DC signal of the sensor output and
the op amp input offset voltage are not amplified, they are
showing at the output of the first stage op amp.
to V
- 1.1V. The example circuit sets the operating
DD
point at V /2.
DD
The low cut-off frequency is
The first stage gain is set by G1 = 1 + R3/R1 = 46.3. This
gain guarantees the amplified signal will not saturate the
first stage op amp, but large enough to distinguish the
motion generated signal from the background noise.
1
f
=
LOW
(2× π ×R2× C2)
.
The high cut-off frequency is
The second stage is similar to the first stage. It amplifies the
AC component of the signal and rejects the DC component.
1
f
=
HIGH
(2 × π ×R1× C1)
.
The high cutoff frequency f
= 1/(2 x π x R5 x C5) =
HIGH2
7 Hz. The low cutoff frequency is f
= 1/(2 x π x R4
LOW2
x C4) = 0.5 Hz. The second stage gain is G2 = 1 + R5/
R4 = 46.3. Similar to the first stage, the input offset volt-
age does not matter because only AC is amplified. The
bias voltage at the noninverting input is set to 1.1V, so
V
/2
DD
V
DD
C3
IN1+
IN1-
INPUT
that the input has the largest swing between 0V to V
-
DD
OUT1
1.1V. Use large divider network resistors to reduce power
consumption of the system.
1/2 MAX40018
The circuit has a GBP requirement of 7Hz x 46.3 = 324.1Hz,
which is guaranteed by the MAX40018's GBP of 9kHz.
The MAX40018's dual op amps and the ultra-low supply
current of 350nA per channel make it a perfect fit for this
motion detection circuit.
R1
C1
R2
C2
Figure 3. Active Band-Pass Filter
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MAX40018
Dual nanoPower Op Amps
in Tiny WLP and TDFN Packages
R3 680k
C3 33nF
V
R5 680k
DD
V
DD
C1
R1
22µF
15k
R8
33k
C5 33nF
22µF
C4
R4 15k
1/2 MAX40018
D
PIR
SENSOR
S
G
2/2 MAX40018
OUT
R2
C2
1nF
47k
V
DD
R6
R7 1M
2M
C6
10nF
Figure 4. Motion Detection Circuit
R1
R3
V
DD
C1
I
SENSE
R2
C3
RE
CE
VREF1
1/2 MAX40018
WE
VREF2
2/2 MAX40018
VOUT
GAS
SENSOR
Figure 5. Gas Detection Circuit
output. The output voltage V
= VREF2 - I
x R3.
Gas Detection Circuit
Figure 5 shows a gas detection circuit using the MAX40018.
OUT
SENSE
I
can be positive or negative, depending on the
SENSE
type of the sensor.
The first op amp generates a constant voltage at the sensor
reference electrode (RE). The op amp's ultra-low input
bias current of 1pA is ideal for this stage. The second op
amp converts the sensor output current into a voltage
The MAX40018's dual op amps, ultra-low current
consumption, and ultra-low input bias current minimizes
the power requirement of the gas detection circuit, while
providing high accuracy and low system cost.
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MAX40018
Dual nanoPower Op Amps
in Tiny WLP and TDFN Packages
Ordering Information
PART NUMBER
MAX40018ANA+
MAX40018ATA+
TEMP RANGE
PIN-PACKAGE
WLP-8
PACKAGE CODE
N80B1+1
TOP MARK
AAK
-40°C to +125°C
-40°C to +125°C
TDFN
T833+2
BAA
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Denotes tape-and-reel.
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MAX40018
Dual nanoPower Op Amps
in Tiny WLP and TDFN Packages
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
12/17
4/18
0
1
2
3
Initial release
—
12
Updated Ordering Information table
Updated Pin Configuration and Pin Description
Updated Electrical Characteristics table
10/19
11/19
7, 8
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
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.
2019 Maxim Integrated Products, Inc.
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