MAX9939 Maxim, MAX9939 Datasheet
MAX9939
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MAX9939 Summary of contents
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... 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. Sensorless Motor Control ...
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... 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 ...
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Input V ELECTRICAL CHARACTERISTICS (continued 5V 0V Gain = 10V/ GND INA+ INA- Typical values are +25°C.) (Note 1) A PARAMETER SYMBOL Unity-Gain Bandwidth UGBW Slew ...
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SPI Programmable-Gain Amplifier with Input CSS t CSO SCLK DIN Figure 1. SPI Interface Timing Diagram ( 0V, Gain = 10V/ GND IN+ IN- PGA ...
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... PGA 100 10 10,000 100,000 10 / +25°C, unless otherwise noted INPUT V TRIM RESPONSE OS MAX9939 toc08 OUTA 10mV/div GAIN = 1V/V 1ms/div TOTAL HARMONIC DISTORTION vs. FREQUENCY GAIN = 157V/V GAIN = 1V/V 0 100 FREQUENCY (kHz) NOISE VOLTAGE DENSITY AMPLIFIER B 100 1000 ...
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... OUT P 100 120 140 160 GAIN (V/V) (PGA, GAIN = 157V/V) MAX9939 toc16 INA+ - INA- 2mV/div OUTA 1V/div 400ns/div GAIN ADJUST RESPONSE MAX9939 toc18 INA+ - INA- 2mV/div OUTA 1V/div GAIN = 40V/V GAIN = 157V/V 200µs/div ...
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... Acti ve- Low ect Inp ut enab l e the ser nter face sab l e the ser nter face. 10 Detailed Description The MAX9939 is a general-purpose PGA with input off- set trim capability. Its gain and input offset voltage (V ) are SPI programmable ...
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... Figure 1). Initiating a write to the MAX9939 is accomplished by pulling CS low. Data is clocked in on the rising edge of each clock pulse, and is written LSB first. Each write to the MAX9939 consists 8 _______________________________________________________________________________________ Trim and Output Op Amp ...
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... SPI decode circuitry is still active. Each instruction requires a write to the SHDN bit. MEAS: The MAX9939 provides a means for measuring its own input offset voltage. When MEAS is set to 1, the INA- input is disconnected from the input signal path and internally shorted to INA+ ...
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... Differential-Input, Differential-Output PGA The output amplifier can be configured so that the MAX9939 operates as a differential-input, differential- output programmable gain amplifier. As shown in Figure 4, use a 10kΩ resistor between OUTA and INB, and between INB and OUTB. Such a differential-output configuration is ideal for use in low-voltage applications that can benefit from the 2X output voltage dynamic range when compared to single-ended output format ...
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... INA- 10kΩ INPUT OFFSET- GAIN SHUTDOWN VOLTAGE TRIM SPI REGISTERS SCLK DIN CS Figure 3. Using the MAX9939 Output Amplifier as an Anti-Aliasing Filter (Corner Frequency = 1.3kHz) to Maximize Nyquist Bandwidth ______________________________________________________________________________________ SPI Programmable-Gain Amplifier Trim and Output Op Amp 1µF 0.1µ 20kΩ ...
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... INA+ LVL 10kΩ INA- 10kΩ INPUT OFFSET- GAIN SHUTDOWN VOLTAGE TRIM SPI REGISTERS SCLK DIN CS Figure 4. Using the MAX9939 as a Differential-Input, Differential-Output PGA 12 ______________________________________________________________________________________ Trim and Output Op Amp V CC 1µF 0.1µ 20kΩ 20kΩ ...
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... SPI Programmable-Gain Amplifier with Input V OS MAX9939 10kΩ INA+ LVL 10kΩ INA- 10kΩ INPUT OFFSET- GAIN SHUTDOWN VOLTAGE TRIM SPI REGISTERS SCLK DIN CS ______________________________________________________________________________________ Trim and Output Op Amp Functional Diagram 20kΩ 20kΩ ...
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... Input V OS For the latest package outline information and land patterns 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 ...
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... Modified Figure 2 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © ...