1 Features

1• Two Simultaneous Sampling 12-Bit ADCs

– Conversion Rate: 125 kSps (Minimum)

• 12-Bit Current Sense Channel

– Input-referred Offset: ±15 μV

– Common-mode Voltage Range: –0.2 V to 2 V

– Maximum Differential Input Voltage: 75 mV

– Fixed Gain: 25 V/V

– Gain Error: ±0.75% (Maximum)

– Bandwidth (–3dB): 70 kHz

– DC PSRR: 100 dB

– DC CMRR: 110 dB

• 12-Bit Voltage Channel

– INL: ±1 LSB

– Offset Error: ±2 mV (Maximum)

– Gain Error: ±0.75% (Maximum)

– Maximum Input Voltage: 2.048 V

– Bandwidth: 100 kHz

• Internal Reference

• SPI Frequency: Up to 20 MHz

• Temperature Range: –40°C to 105°C

• 16-Pin WSON Package

2 Applications

• Enterprise Servers

• Telecommunications

• Power Management

3 Description

The LMP92064 is a precision low-side digital current

sensor and voltage monitor with a digital SPI interface. This analog frontend (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 2.048-V

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 lets the user 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 4.5-V to 5.5-V

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 5-mm x 4-mm

16-Pin WSON package.