LM12H458CIVF/NOPB

ADCs/DACs - Special Purpose Overview

The LM12H458CIVF/NOPB is a highly integrated 12-bit plus sign data acquisition system manufactured by Texas Instruments. It combines a fully-differential self-calibrating analog-to-digital converter, sample-and-hold circuit, and an eight-channel multiplexer on a single chip. The device operates on a single supply voltage ranging from 3V to 5.5V and features an internal 2.5V bandgap reference. It includes a 32-word FIFO buffer for storing up to 32 consecutive conversions and an 8-word instruction RAM for sequencing acquisitions. The component supports both 8-bit and 12-bit plus sign resolution modes.

ADCs/DACs - Special Purpose Feature Summary

• Self-calibrating 13-bit (12-bit + sign) ADC with built-in sample-and-hold
• Eight-channel input multiplexer with programmable acquisition times
• Internal 32-word FIFO and 8-word instruction RAM for event sequencing
• Direct Memory Access (DMA) interface for high-speed data transfer

ADCs/DACs - Special Purpose Applications

• Data logging systems
• Industrial instrumentation
• Process control applications
• Energy management monitoring
• Inertial guidance systems

ADCs/DACs - Special Purpose Procurement Notes

Verify the ordering suffix 'VGZ44A' corresponds to the PQFP package when sourcing this specific part number. Confirm that the 'NOPB' designation indicates lead-free and RoHS compliance as per manufacturer specifications. Ensure the source document explicitly lists the LM12H458CIVF/NOPB variant to avoid confusion with the standard PLCC packaged versions.

ADCs/DACs - Special Purpose Selection Notes

Select the LM12H458CIVF/NOPB over the LM12458 variants when a guaranteed minimum clock frequency of 8 MHz is required for higher throughput rates. The PQFP package is suitable for surface mount assembly where thermal dissipation characteristics of 47°C/W are acceptable. Consider the 8MHz speed capability if the application demands a minimum throughput rate of 140k samples/s compared to the 88k samples/s limit of the 5MHz devices.

ADCs/DACs - Special Purpose Part Context

This component belongs to the LM1245x family of data acquisition systems produced by National Semiconductor, now part of Texas Instruments. The LM12H458 is the high-speed version of the LM12458, distinguished by its ability to operate at clock frequencies up to 8 MHz. The 'CIVF' suffix identifies the industrial temperature range (-40°C to 85°C) and the VGZ44A plastic quad flat pack package.

ADCs/DACs - Special Purpose Replacement Considerations

The LM12458CIVF serves as a functional substitute with a lower guaranteed clock frequency of 5 MHz. The obsolete LM12454CIVF offers similar functionality but is limited to a four-channel multiplexer. Verify pin compatibility and timing requirements before substituting these parts.