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MAX9939 Datasheet

SPI Programmable-Gain Amplifier

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MAX9939
SPI Programmable-Gain Amplifier
with Input VOS Trim and Output Op Amp
General Description
The MAX9939 is a general-purpose, differential-input
programmable-gain amplifier (PGA) that is ideal for con-
ditioning a variety of wide dynamic range signals such
as those found in motor current-sense, medical instru-
mentation, and sonar data acquisition applications. It
features programmable differential gains from 0.2V/V to
157V/V, input offset-voltage compensation, and an out-
put amplifier that can be configured either as a high-
order active filter or to provide a differential output.
The PGA is optimized for high-signal bandwidth and its
gain can be programmed to be 0.2V/V, 1V/V, 10V/V,
20V/V, 30V/V, 40V/V, 60V/V, 80V/V, 119V/V, and 157V/V.
Precision resistor matching provides extremely low gain
tempco and high CMRR. Although the MAX9939 oper-
ates from a single supply VCC between 2.9V to 5.5V, it
can process signals both above and below ground due
to the use of an input level-shifting amplifier stage.
Furthermore, its inputs are protected to ±16V, allowing it
to withstand fault conditions and signal overranges.
The output amplifier is designed for high bandwidth
and low-bias currents, making it ideal for use in multi-
ple-feedback active filter topologies that offer much
higher Qs and stopband attenuation than Sallen-Key
architectures.
The MAX9939 draws 3.4mA of quiescent supply current
at 5V, and includes a software-programmable shut-
down mode that reduces its supply current to only
13µA. The MAX9939 is available in a 10-pin µMAX®
package and operates over the -40°C to +125°C auto-
motive temperature range.
Applications
Sensorless Motor Control
Medical Signal Conditioning
Sonar and General Purpose Data Acquisition
Differential to Single-Ended Conversion
Differential-Input, Differential-Output Signal
Amplification
Sensor Interface and Signal Processing
Features
o SPI-Programmable Gains: 0.2V/V to 157V/V
o Extremely Low Gain Tempco
o Integrated Amplifier for R/C Programmable Active
Filter
o Input Offset-Voltage Compensation
o Input Protection to ±16V
o 13µA Software Shutdown Mode
o -40°C to +125°C Operating Temperature Range
o 10-Pin µMAX Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX9939AUB+
-40°C to +125°C
10 µMAX
MAX9939AUB/V+T -40°C to +125°C
10 µMAX
/V denotes an automotive-qualified part.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
+
SCLK 1
DIN 2
GND 3
MAX9939
INA- 4
INA+ 5
µMAX
10 CS
9 VCC
8 OUTA
7 INB
6 OUTB
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Functional Diagram appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-4329; Rev 3; 12/12


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX9939 Datasheet

SPI Programmable-Gain Amplifier

No Preview Available !

MAX9939
SPI Programmable-Gain Amplifier
with Input VOS Trim and Output Op Amp
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V
INB, OUTA, OUTB, SCLK, DIN, CS............-0.3V to (VCC + 0.3V)
INA+, INA- to GND ..................................................-16V to +16V
Output Short-Circuit Current Duration........................Continuous
Continuous Input Current into Any Terminal.....................±20mA
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........707mW
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 (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
(VCC = 5V, VGND = 0V, VINA+ = VINA-, Gain = 10V/V, ROUTA = ROUTB = 1kto VCC/2, TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
PGA CHARACTERISTICS
Gain Error
Gain Temperature-Coefficient
Input Offset Voltage (Note 2)
Input Offset-Voltage Drift
Input Offset-Voltage Trim Range
GE
Tc-GE
VOS-A
TA = +25°C, 0.2V VOUTA VCC - 0.2V
With no VOS trim, TA = +25°C
With no VOS trim, TA = TMIN to TMAX
0.05 0.38
%
2.2 17 ppm/°C
1.5 9
mV
15
10 µV/C
±17 mV
Input Common-Mode Range
VCM Guaranteed by CMRR test (Note 3)
-VCC/2
VCC
- 2.2
V
Common-Mode Rejection Ratio
Output Short-Circuit current
Input-Voltage Noise Density
Gain-Bandwidth Product
CMRR
ISC
VN
GBW
-1V VCM VCC - 2.2V
-VCC/2 VCM VCC - 2.2V, TA = +25°C
-VCC/2 VCM VCC - 2.2V
f = 10kHz, gain = 157V/V
Gain = 0.2V/V
Gain = 1V/V
Gain = 157V/V
50 60
50 60
39
70
54
2.15
279
dB
mA
nV/√Hz
MHz
Slew Rate
Settling Time
Distortion
Max Capacitive Load
SR
tS
THD
CL(MAX)
Output Swing
VOH, VOL
OUTPUT AMPLIFIER CHARACTERISTICS
To 1%, 2V output step
f = 1kHz, VOUTA = 2.5VP-P
Voltage output high = VCC - VOUTA,
voltage output low = VOUTA - VGND
9 V/µs
0.45 µs
89 dB
1 nF
25 60 mV
Input Bias Current
Input Offset Voltage (Note 2)
Output Short-Circuit Current
Ib
VOS-B
ISC
(Note 4)
TA = +25°C
TA = TMIN to TMAX
1 pA
1.5 9
mV
15
70 mA
2 Maxim Integrated


Part Number MAX9939
Description SPI Programmable-Gain Amplifier
Maker Maxim Integrated Products
Total Page 15 Pages
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