19-4398; Rev 1; 12/10
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
The MAX9945 operational amplifier features an excellent
combination of low operating power and low input voltage noise. In addition, MOS inputs enable the MAX9945
to feature low input bias currents and low input current
noise. The device accepts a wide supply voltage range
from 4.75V to 38V and draws a low 400µA quiescent current. The MAX9945 is unity-gain stable and is capable of
rail-to-rail output voltage swing.
The MAX9945 is ideal for portable medical and industrial applications that require low noise analog front-ends
for performance applications such as photodiode transimpedance and chemical sensor interface circuits.
The MAX9945 is available in both an 8-pin µMAX® and
a space-saving, 6-pin TDFN package, and is specified
over the automotive operating temperature range
(-40°C to +125°C).
Features
o +4.75V to +38V Single-Supply Voltage Range
o ±2.4V to ±19V Dual-Supply Voltage Range
o Rail-to-Rail Output Voltage Swing
o 400µA Low Quiescent Current
o 50fA Low Input Bias Current
√Hz Low Input Current Noise
o 1fA/√
√Hz Low Noise
o 15nV/√
o 3MHz Unity-Gain Bandwidth
o Wide Temperature Range from -40°C to +125°C
o Available in Space-Saving, 6-Pin TDFN Package
(3mm x 3mm)
Ordering Information
Applications
Medical Pulse Oximetry
PART
Photodiode Sensor Interface
Industrial Sensors and Instrumentation
Chemical Sensor Interface
TEMP RANGE
PINPACKAGE
MAX9945ATT+
-40°C to +125°C 6 TDFN-EP*
MAX9945AUA+
-40°C to +125°C 8 µMAX
TOP
MARK
AUE
—
+Denotes a lead(Pb)-free/RoHS-compliant package.
High-Performance Audio Line Out
*EP = Exposed pad.
Active Filters and Signal Processing
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
VCC
PHOTODIODE
INOUT
MAX9945
SIGNAL
CONDITIONING/
FILTERS
ADC
IN+
VEE
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
MAX9945
General Description
MAX9945
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE) ..................................-0.3V to +40V
IN+, IN-, OUT Voltage......................(VEE - 0.3V) to (VCC + 0.3V)
IN+ to IN- .............................................................................±12V
OUT Short Circuit to Ground Duration....................................10s
Continuous Input Current into Any Pin .............................±20mA
Continuous Power Dissipation (TA = +70°C)
6-Pin TDFN-EP (derate 23.8mW/°C above +70°C)
Multilayer Board ....................................................1904.8mW
8-Pin µMAX (derate 4.8mW/°C above +70°C)
Multilayer Board ......................................................387.8mW
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
Soldering Temperature ....................................................+260°C
PACKAGE THERMAL CHARACTERISTICS (Note 1)
µMAX
Junction-to-Ambient Thermal Resistance (θJA) .......206.3°C/W
Junction-to-Case Thermal Resistance θJC ...................42°C/W
TDFN-EP
Junction-to-Ambient Thermal Resistance (θJA) ............42°C/W
Junction-to-Case Thermal Resistance (θJC) ...................9°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
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
(VCC = +15V, VEE = -15V, VIN+ = VIN- = VGND = 0V, ROUT = 100kΩ to GND, TA = -40°C to +125°C, typical values are at TA = +25°C,
unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC ELECTRICAL CHARACTERISTICS
Input Voltage Range
Input Offset Voltage
Input Offset Voltage Drift
VIN+, VIN-
VOS
Guaranteed by
CMRR
TA = +25°C
VEE
VCC 1.2
TA = TMIN to TMAX
VEE
VCC 1.4
V
TA = +25°C
±0.6
TA = TMIN to TMAX
VOS - TC
2
-40°C ≤ TA ≤ +25°C
Input Bias Current (Note 3)
Common-Mode Rejection Ratio
Open-Loop Gain
Output Short-Circuit Current
2
IB
CMRR
AOL
ISC
±5
±8
50
-40°C ≤ TA ≤ +70°C
mV
µV/°C
150
fA
12
pA
-40°C ≤ TA ≤ +85°C
55
pA
-40°C ≤ TA ≤ +125°C
1.9
nA
VCM = VEE to VCC - 1.2V,
TA = +25°C
78
94
VCM = VEE to VCC - 1.4V,
TA = TMIN to TMAX
78
94
VEE + 0.3V ≤ VOUT ≤ VCC - 0.3V,
ROUT = 100kΩ to GND
110
130
VEE + 0.75V ≤ VOUT ≤ VCC - 0.75V,
ROUT = 10kΩ to GND
110
130
dB
dB
25
_______________________________________________________________________________________
mA
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
(VCC = +15V, VEE = -15V, VIN+ = VIN- = VGND = 0V, ROUT = 100kΩ to GND, TA = -40°C to +125°C, typical values are at TA = +25°C,
unless otherwise noted.) (Note 2)
PARAMETER
Output Voltage Low
Output Voltage High
SYMBOL
VOL
VOH
CONDITIONS
MIN
TYP
MAX
VEE +
0.45
VEE +
0.15
ROUT = 10kΩ to GND
TA = TMIN to TMAX
VEE +
0.26
ROUT = 100kΩ to
GND
TA = TMIN to TMAX
VEE +
0.05
ROUT = 10kΩ to GND
TA = TMIN to TMAX
VCC 0.45
VCC 0.24
TA = TMIN to TMAX
VCC 0.15
VCC 0.03
UNITS
V
V
ROUT = 100kΩ to
GND
AC ELECTRICAL CHARACTERISTICS
Input Current-Noise Density
Input Voltage Noise
IN
VNP-P
Input Voltage-Noise Density
Gain Bandwidth
Slew Rate
Capacitive Loading (Note 4)
Total Harmonic Distortion
VN
f = 1kHz
1
fA/√Hz
f = 0.1Hz to 10Hz
2
µVP-P
f = 100Hz
25
f = 1kHz
16.5
f = 10kHz
15
nV/√Hz
GBW
3
MHz
SR
2.2
V/µs
No sustained oscillations
120
pF
VOUT = 4.5VP-P, AV = 1V/V,
f = 10kHz, ROUT = 10kΩ to GND
97
dB
CLOAD
THD
POWER-SUPPLY ELECTRICAL CHARACTERISTICS
Power-Supply Voltage Range
VCC - VEE
Power-Supply Rejection Ratio
PSRR
Quiescent Supply Current
ICC
Guaranteed by PSRR, VEE = 0V
VCC - VEE = +4.75V to +38V
TA = +25°C
TA = TMIN to TMAX
+4.75
82
+38
100
400
V
dB
700
850
µA
Note 2: All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
Note 3: Guaranteed by design. IN+ and IN- are internally connected to the gates of CMOS transistors. CMOS GATE leakage is so
small that it is impractical to test in production. Devices are screened during production testing to eliminate defective units.
Note 4: Specified over all temperatures and process variation by circuit simulation.
_______________________________________________________________________________________
3
MAX9945
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(VCC = +15V, VEE = -15V, VIN+ = VIN- = VGND = 0V, ROUT = 100kΩ to GND, TA = -40°C to +125°C, typical values are at TA = +25°C,
unless otherwise noted.)
TA = +125°C
400
0.15
ISINK = 1.0mA
0.10
TA = +25°C
MAX9945 toc03
0.20
VCC - VOH (V)
0.20
500
0.25
MAX9945 toc02
MAX9945 toc01
0.25
VOL - VEE (V)
SUPPLY CURRENT (µA)
600
OUTPUT VOLTAGE SWING HIGH
vs. TEMPERATURE
OUTPUT VOLTAGE SWING LOW
vs. TEMPERATURE
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE AND TEMPERATURE
0.15
ISOURCE = 1.0mA
0.10
ISOURCE = 0.1mA
ISINK = 0.1mA
300
0.05
0.05
TA = -40°C
200
0
0
10
15
20
25
30
35
-40 -20
0
20
40
60
80
-40 -20
100 120
0
20
40
60
100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT BIAS CURRENT
vs. TEMPERATURE
INPUT VOLTAGE
0.1Hz TO 10Hz NOISE
INPUT VOLTAGE-NOISE DENSITY
vs. FREQUENCY
MAX9945 toc05
70
60
1000
INPUT VOLTAGE-NOISE DENSITY (nV/ Hz)
MAX9945 toc04
80
50
40
30
20
10
0
100
10
-10
-20
0
20
40
60
80
100 120
1
1s/div
1µV/div
TEMPERATURE (°C)
1000
TOTAL HARMONIC DISTORTION + NOISE
vs. FREQUENCY
-50
MAX9945 toc07
VCC - VEE = 30V,
4.5VP-P, RL = 10kΩ
100
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
-70
10
MAX9945 toc08
-40
VCC - VEE = 30V
4.5VP-P
RL = 10kΩ
-60
THD+N (dB)
THD (dB)
-80
-90
-100
-70
-80
-90
-100
-110
100
1000
10,000
FREQUENCY (Hz)
4
80
SUPPLY VOLTAGE (V)
MAX9945 toc06
5
IBIAS (pA)
MAX9945
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
100,000
10
100
1000
10,000
100,000
FREQUENCY (Hz)
_______________________________________________________________________________________
10,000 100,000
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
600
400
200
MAX9945 toc10
800
1000
VCM = VCC - 1.2V
INPUT OFFSET VOLTAGE (µV)
MAX9945 toc09
INPUT OFFSET VOLTAGE (μV)
1000
800
600
VCM = 0V
400
200
VCM = VEE
0
0
-10
-5
0
5
-40 -20
10
20
40
60
80
100 120
TEMPERATURE (°C)
OPEN-LOOP GAIN
vs. FREQUENCY
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
-20
MAX9945 toc11
120
-30
-40
80
CMRR (dB)
OPEN-LOOP GAIN (dB)
0
COMMON-MODE VOLTAGE (V)
MAX9945 toc12
-15
40
-50
-60
-70
-80
0
-90
-40
-100
1
10
100
1k
10k 100k 1M 10M
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
RESISTOR ISOLATION
vs. CAPACITIVE LOAD
MAX9945 toc13
0
-20
1M
10M
10,000
MAX9945 toc14
1m
UNSTABLE
-60
UNIPOLAR
PSRR-
UNIPOLAR
PSRR+
CLOAD (pF)
PSRR (dB)
-40
1000
-80
STABLE
BIPOLAR
PSRR
-100
100
-120
1
10
100
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1
10
100
RISO (Ω)
_______________________________________________________________________________________
5
MAX9945
Typical Operating Characteristics (continued)
(VCC = +15V, VEE = -15V, VIN+ = VIN- = VGND = 0V, ROUT = 100kΩ to GND, TA = -40°C to +125°C, typical values are at TA = +25°C,
unless otherwise noted.)
Typical Operating Characteristics (continued)
(VCC = +15V, VEE = -15V, VIN+ = VIN- = VGND = 0V, ROUT = 100kΩ to GND, TA = -40°C to +125°C, typical values are at TA = +25°C,
unless otherwise noted.)
OP-AMP STABILITY
vs. CAPACITIVE AND RESISTIVE LOADS
OUTPUT IMPEDANCE
vs. FREQUENCY
OUTPUT IMPEDANCE (Ω)
UNSTABLE
1000
STABLE
100
1000.00
MAX9945 toc16
MAX9945 toc15
PARALLEL LOAD CAPACITANCE (pF)
10,000
100.00
10.00
ACL = 10
1.00
ACL = 1
0.10
0.01
10
10
100
1000
10
10,000
100
1k
10k
100k
1M
PARALLEL LOAD RESISTANCE (kΩ)
FREQUENCY (Hz)
LARGE-SIGNAL RESPONSE
vs. FREQUENCY
LARGE SIGNAL-STEP RESPONSE
10M
RLOAD = 100kΩ
25
MAX9945 toc17
MAX9945 toc18
30
OUTPUT VOLTAGE (VP-P)
MAX9945
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
AV = 1V/V
VIN = 10VP-P
RL = 10kΩ
CL = 100pF
+5V
20
VOUT
2.5V/div
15
10
-5V
5
0
1
10
100
1000
4μs/div
10,000
FREQUENCY (kHz)
SMALL SIGNAL-STEP RESPONSE
LARGE SIGNAL-STEP RESPONSE
MAX9945 toc20
MAX9945 toc19
+1V
AV = 1V/V
VIN = 40mVP-P
RL = 100kΩ
AV = 1V/V
VIN = 2VP-P
RL = 10kΩ
CL = 100pF
+20mV
VOUT
500mV/div
VOUT
10mV/div
-1V
-20mV
1μs/div
6
2μs/div
_______________________________________________________________________________________
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
PIN
NAME
FUNCTION
TDFN-EP
µMAX
1
6
OUT
Amplifier Output
2
4
VEE
Negative Power Supply. Bypass VEE with 0.1µF ceramic and 4.7µF electrolytic
capacitors to quiet ground plane if different from VEE.
3
3
IN+
Noninverting Amplifier Input
Inverting Amplifier Input
4
2
IN-
5
1, 5, 8
N.C.
No Connection. Not internally connected.
6
7
VCC
Positive Power Supply. Bypass VCC with 0.1µF ceramic and 4.7µF electrolytic capacitors
to quiet ground plane or VEE.
—
—
EP
Exposed Pad (TDFN Only). Connect to VEE externally. Connect to a large copper plane
to maximize thermal performance. Not intended as an electrical connection (TDFN only).
Detailed Description
The MAX9945 features a combination of low input current and voltage noise, rail-to-rail output voltage swing,
wide supply voltage range, and low-power operation.
The MOS inputs on the MAX9945 make it ideal for use
as transimpedance amplifiers and high-impedance
sensor interface front-ends in medical and industrial
applications. The MAX9945 can interface with small
signals from either current-sources or high-output
impedance voltage sources. Applications include photodiode pulse oximeters, pH sensors, capacitive pressure sensors, chemical analysis equipment, smoke
detectors, and humidity sensors.
A high 130dB open-loop gain (typ) and a wide supply
voltage range, allow high signal-gain implementations
prior to signal conditioning circuitry. Low quiescent
supply current makes the MAX9945 compatible with
portable systems and applications that operate under
tight power budgets. The combination of excellent THD,
low voltage noise, and MOS inputs also make the
MAX9945 ideal for use in high-performance active filters for data acquisition systems and audio equipment.
Low-Current, Low-Noise Input Stage
The MAX9945 features a MOS-input stage with only
50fA (typ) of input bias current and a low 1fA/√Hz (typ)
input current-noise density. The low-frequency input
voltage noise is a low 2µVP-P (typ). The input stage
accepts a wide common-mode range, extending from
the negative supply, VEE, to within 1.2V of the positive
supply, VCC.
Rail-to-Rail Output Stage
The MAX9945 output stage swings to within 50mV (typ)
of either power-supply rail with a 100kΩ load and provides a 3MHz GBW with a 2.2V/µs slew rate. The
device is unity-gain stable, and unlike other devices
with a low quiescent current, can drive a 120pF capacitive load without compromising stability.
Applications Information
High-Impedance Sensor Front Ends
High-impedance sensors can output signals of interest
in either current or voltage form. The MAX9945 interfaces to both current-output sensors such as photodiodes and potentiostat sensors, and high-impedance
voltage sources such as pH sensors.
For current-output sensors, a transimpedance amplifier
is the most noise-efficient method for converting the
input signal to a voltage. High-value feedback resistors
are commonly chosen to create large gains, while feedback capacitors help stabilize the amplifier by canceling any zeros in the transfer function created by a
highly capacitive sensor or cabling. A combination of
low-current noise and low-voltage noise is important for
these applications. Take care to calibrate out photodiode dark current if DC accuracy is important. The high
bandwidth and slew rate also allows AC signal processing in certain medical photodiode sensor applications such as pulse oximetry.
_______________________________________________________________________________________
7
MAX9945
Pin Description
MAX9945
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
+
1
8
2
7
3
6
IN4
+
MAX9945
IN+
MAX9945
5
μMAX
VOUT
-
Figure 1. Shielding the Inverting Input to Reduce Leakage
For voltage-output sensors, a noninverting amplifier is
typically used to buffer and/or apply a small gain to, the
input voltage signal. Due to the extremely high impedance of the sensor output, a low input bias current with
a small temperature variation is very important for these
applications.
IN+
10kΩ
Power-Supply Decoupling
The MAX9945 operates from a +4.75V to +38V, VEE referenced power supply. Bypass the power-supply
inputs VCC and VEE to a quiet copper ground plane,
with a 0.1µF ceramic capacitor in parallel with a 4.7µF
electrolytic capacitor, placed close to the leads.
Layout Techniques
A good layout is critical to obtaining high performance
especially when interfacing with high-impedance sensors. Use shielding techniques to guard against parasitic leakage paths. For transimpedance applications,
for example, surround the inverting input, and the
traces connecting to it, with a buffered version of its
own voltage. A convenient source of this voltage is the
noninverting input pin. Pins 1, 5, and 8 on the µMAX
package are unconnected, and can be connected to
an analog common potential, or to the driven guard
potential, to reduce leakage on the inverting input.
A good layout guard rail isolates sensitive nodes, such
as the inverting input of the MAX9945 and the traces
connecting to it (see Figure 1), from varying or large voltage differentials that otherwise occur in the rest of the
circuit board. This reduces leakage and noise effects,
allowing sensitive measurements to be made accurately.
8
MAX9945
10kΩ
IN-
Figure 2. Input Differential Voltage Protection
Take care to also decrease the amount of stray capacitance at the op amp’s inputs to improve stability. To
achieve this, minimize trace lengths and resistor leads
by placing external components as close as possible to
the package. If the sensor is inherently capacitive, or is
connected to the amplifier through a long cable, use a
low-value feedback capacitor to control high-frequency
gain and peaking to stabilize the feedback loop.
_______________________________________________________________________________________
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
Chip Information
PROCESS: BiCMOS
_______________________________________________________________________________________
9
MAX9945
Input Differential Voltage Protection
During normal op-amp operation, the inverting and noninverting inputs of the MAX9945 are at approximately
the same voltage. The ±12V absolute maximum input
differential voltage rating offers sufficient protection for
most applications. If there is a possibility of exceeding
the input differential voltage specification, in the presence of extremely fast input voltage transients or due to
certain application-specific fault conditions, use external low-leakage pico-amp diodes and series resistors
to protect the input stage of the amplifier (see Figure 2).
The extremely low input bias current of the MAX9945
allows a wide range of input series resistors to be used.
If low input voltage noise is critical to the application,
size the input series resistors appropriately.
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
MAX9945
Pin Configurations
TOP VIEW
+
+
N.C. 1
8
N.C.
IN- 2
7
VCC
3
6
OUT
VEE 4
5
N.C.
MAX9945
IN+
µMAX
10
OUT
1
VEE
2
IN+
3
MAX9945
6
VCC
5
N.C.
4
IN-
EP
TDFN
______________________________________________________________________________________
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND
PATTERN NO.
6 TDFN-EP
T633+2
21-0137
90-0058
8 µMAX
U8+1
21-0036
90-0092
______________________________________________________________________________________
11
MAX9945
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.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.
MAX9945
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.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.
COMMON DIMENSIONS
12
PACKAGE VARIATIONS
MIN.
MAX.
PKG. CODE
N
D2
E2
e
JEDEC SPEC
b
A
0.70
0.80
T633-2
6
1.50±0.10
2.30±0.10
0.95 BSC
MO229 / WEEA
0.40±0.05
1.90 REF
D
2.90
3.10
T833-2
8
1.50±0.10
2.30±0.10
0.65 BSC
MO229 / WEEC
0.30±0.05
1.95 REF
SYMBOL
[(N/2)-1] x e
E
2.90
3.10
T833-3
8
1.50±0.10
2.30±0.10
0.65 BSC
MO229 / WEEC
0.30±0.05
1.95 REF
A1
0.00
0.05
T1033-1
10
1.50±0.10
2.30±0.10
0.50 BSC
MO229 / WEED-3
0.25±0.05
2.00 REF
L
0.20
0.40
T1033MK-1
10
1.50±0.10
2.30±0.10
0.50 BSC
MO229 / WEED-3
0.25±0.05
2.00 REF
k
0.25 MIN.
T1033-2
10
1.50±0.10
2.30±0.10
0.50 BSC
MO229 / WEED-3
0.25±0.05
2.00 REF
A2
0.20 REF.
T1433-1
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.05
2.40 REF
T1433-2
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.05
2.40 REF
T1433-3F
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.05
2.40 REF
______________________________________________________________________________________
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
α
α
______________________________________________________________________________________
13
MAX9945
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.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.
MAX9945
38V, Low-Noise, MOS-Input,
Low-Power Op Amp
Revision History
REVISION
NUMBER
REVISION
DATE
0
2/09
Initial release
1
12/10
Updated Input Bias Current spec in the Electrical Characteristics table and
updated Note 3
DESCRIPTION
PAGES
CHANGED
—
2, 3
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.
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