Precision, Low-Side, 125kSps Simultaneous Sampling, Current Sensor and Voltage Monitor with SPI - LMP92064

LMP92064 (ACTIVE)

Precision, Low-Side, 125kSps Simultaneous Sampling, Current Sensor and Voltage Monitor with SPI

Description

The LMP92064 is a precision low-side digital current sensor and voltage monitor with a digital SPI interface. This analog front-end (AFE) includes a precision current sense amplifier to measure a load current across a shunt resistor and a buffered voltage channel to measure the voltage supply of the load. The current and voltage channels are sampled simultaneously by independent 125 kSps 12-bit ADC converters, allowing for very accurate power calculations in unidirectional sensing applications.

The LMP92064 includes an internal 2.048V reference for the ADCs, eliminating the need of an external reference and reducing component count and board space.

A host can communicate with the LMP92064 using a four-wire SPI interface running at speeds of up to 20 MHz. The fast SPI interface allows the user to take advantage of the higher bandwidth ADC to capture fast varying signals. The four-wire interface with dedicated unidirectional input and output lines also allows for an easy interface to digital isolators in applications where isolation is required.

The LMP92064 operates from a single 4.5V to 5.5V supply and includes a separate digital supply pin. The LMP92064 is specified over a temperature range of –40°C to 105°C, and is available in a 5mm x 4mm WSON-16 package.

Features

  • Two Simultaneous Sampling 12-bit ADCs
    • Conversion Rate: 125 kSps (Min)
  • 12-bit Current Sense Channel
    • Input-referred Offset: ±15 µV
    • Common-mode Voltage Range: –0.2V to 2V
    • Maximum Differential Input Voltage: +75 mV
    • Fixed Gain: 25 V/V
    • Gain Error: ±0.75 % (Max)
    • Bandwidth (–3dB): 70 kHz
    • DC PSRR: 100 dB
    • DC CMRR: 110 dB
  • 12-bit Voltage Channel
    • INL: ±1LSB
    • Offset Error: ±2 mV (Max)
    • Gain Error: ±0.75% (Max)
    • Maximum Input Voltage: +2.048V
    • Bandwidth: 100 kHz
  • Internal Reference
  • SPI Frequency: Up to 20 MHz
  • Temperature Range: –40°C to +105°C
  • WSON-16 Package

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Parametrics Compare all products in Current Shunt Monitor Digital Output

 
Input Offset (+/-) (Max) (uV)
Input Offset Drift (+/-) (Typ) (uV/Degrees Celsius)
Gain (V/V)
Gain Error (%)
Small-Signal Bandwidth (Typ) (MHz)
Vs (Min) (V)
Vs (Max) (V)
Common Mode Range (Min)
Common Mode Range (Max)
Special Features
Rating
Operating Temperature Range (C)
Approx. Price (US$)
LMP92064
60    
0.28    
25    
0.25    
0.07    
4.5    
5.5    
-0.2    
+2    
Low-side Capable
I2C    
Catalog    
-40 to 105    
1.99 | 1ku    

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