LMP92064SDX/NOPB

Analog Front End (AFE) Overview

The LMP92064SDX/NOPB is a precision low-side analog front-end (AFE) integrating digital current sensing and voltage monitoring capabilities. It features two independent 12-bit ADCs operating at a minimum conversion rate of 125 kSps, enabling simultaneous sampling for accurate power calculations. The current sense channel utilizes a fixed gain amplifier of 25 V/V with an input-referred offset of ±15 μV and a common-mode voltage range from –0.2 V to 2 V. The buffered voltage channel offers a full-scale input of 2.048 V. An internal 2.048-V reference eliminates the need for external components. Communication is handled via a four-wire SPI interface supporting speeds up to 20 MHz. The device operates on a single 4.5-V to 5.5-V supply within a temperature range of –40°C to 105°C.

Analog Front End (AFE) Feature Summary

• Two simultaneous sampling 12-bit ADCs with a conversion rate of 125 kSps
• Current sense channel with fixed gain of 25 V/V, ±15 μV offset, and 70 kHz bandwidth
• Voltage channel with 100 kHz bandwidth and 2.048 V maximum input
• Internal 2.048-V band-gap reference reducing component count
• Four-wire SPI interface with clock frequencies up to 20 MHz

Analog Front End (AFE) Applications

• Enterprise servers
• Telecommunications systems
• Power management units

Analog Front End (AFE) Procurement Notes

Verify that the ordering suffix 'SDX' corresponds to the tape-and-reel packaging configuration as specified in the manufacturer's orderable addendum. Confirm that the analog supply (VDD) and digital supply (VDIG) are powered simultaneously to ensure proper power-on reset behavior. Ensure the common-mode voltage remains within the operational range of –0.2 V to 2 V to prevent gain errors.

Analog Front End (AFE) Selection Notes

Select this component when simultaneous high-speed sampling of both current and voltage is required for precise power monitoring. The fixed 25 V/V gain on the current channel limits the maximum differential input to 75 mV; verify that the shunt resistor value aligns with the expected load current range. The device requires separate analog and digital supplies, which must ramp up together to avoid reset issues.

Analog Front End (AFE) Part Context

The LMP92064 belongs to Texas Instruments' family of precision analog front-ends designed for digital sensor interfaces. It integrates signal conditioning and data conversion into a single 16-pin WSON package. The device is distinct from general-purpose ADCs by its specialized low-side current sensing architecture and integrated reference, targeting applications requiring compact solutions for power monitoring.

Analog Front End (AFE) Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.