LTC6912IGN-2#PBF

Overview

The LTC6912IGN-2#PBF is a dual-channel, low-noise, digitally programmable gain amplifier (PGA) from Analog Devices. It features independent gain control via a 3-wire SPI interface for each channel. The -2 suffix designates voltage gains of 0, 1, 2, 4, 8, 16, 32, and 64 V/V. Operating on single or split supplies from 2.7V to 10.5V total, it offers rail-to-rail input and output capabilities. Key electrical parameters include a typical supply current of 2.0mA at 5V, a slew rate of 16 V/µs at ±5V, and an input noise density of 12.6 nV/√Hz.

Feature Summary

• Dual channels with independent digital gain programming via 3-wire SPI
• Rail-to-rail input and output signal processing capability
• Internal half-supply reference generation for single-supply operation
• Wired-OR output configuration enabling analog multiplexing functions

Applications

• Data acquisition systems
• Dynamic gain changing circuits
• Automatic ranging applications
• Automatic gain control loops

Procurement Notes

Verify the specific IGN-2 suffix against the manufacturer's latest documentation to confirm the package type and temperature grade. Ensure the ordering suffix #PBF is included if lead-free compliance is required. Cross-reference the part number with official distributors to confirm current availability status and valid datasheet versions before finalizing procurement.

Selection Notes

Select this component when dual-channel signal conditioning with precise digital gain steps is required. The IGN-2 variant provides binary-weighted gains suitable for logarithmic scaling. Verify that the system power supply range falls within the 2.7V to 10.5V limit and that the SPI interface timing requirements are met by the host controller.

Part Context

This device belongs to the LTC6912 family of dual programmable gain amplifiers. The IGN-2 designation indicates the industrial temperature grade (-40°C to 85°C), the GN package style (SSOP-16), and the -2 gain profile. It serves as a specialized amplifier IC designed for compact PCB layouts requiring high dynamic range and low noise performance in measurement systems.

Replacement Considerations

LTC6912CGN-2#PBF: Commercial temperature grade variant.

FAQ

How does the LTC6912 handle single-supply applications?

It utilizes an internally generated half-supply reference at the AGND pin to support single-supply operation.

What is the function of the wired-OR outputs?

The outputs can be connected together to perform a 2:1 analog multiplexing function.