LTC6912IGN-1#PBF

Overview

The LTC6912IGN-1#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 device supports voltage gains of 0, 1, 2, 5, 10, 20, 50, and 100 V/V with all gains being inverting. It operates on single or split supplies ranging from 2.7V to 10.5V total. Key electrical characteristics include a maximum offset voltage of 2mV over the temperature range, channel-to-channel gain matching of 0.1dB maximum, and an input noise density of 12.6nV/√Hz. The package is a 16-lead narrow plastic SSOP.

Feature Summary

• Dual channels with independent digital gain programming via 3-wire SPI
• Rail-to-rail input range and rail-to-rail output swing capabilities
• Low power hardware shutdown function available on GN-16 package
• Wired-OR outputs possible for analog multiplexing applications

Applications

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

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance when sourcing. Confirm the IGN-1 designation corresponds to the industrial temperature grade (-40°C to 85°C) and the 16-lead SSOP package. Ensure the -1 variant matches the required gain steps (0, 1, 2, 5, 10, 20, 50, 100 V/V). Check current distributor availability as supply status may vary.

Selection Notes

Select this component for applications requiring precise, digitally controlled amplification with minimal board space. The -1 suffix provides specific gain steps suitable for standard signal conditioning. Consider the -2 suffix if binary-weighted gains (0, 1, 2, 4, 8, 16, 32, 64 V/V) are preferred. Verify that the 16-lead SSOP package fits the PCB layout constraints compared to the DFN option.

Part Context

This part belongs to the LTC6912 family of dual programmable gain amplifiers. The IGN-1 variant specifically denotes the industrial temperature range and the -1 gain configuration. It is designed to replace discrete amplifier solutions by integrating two matched amplifiers with digital control logic into a compact package.

Replacement Considerations

LTC6912CGN-1#PBF: Commercial temperature grade version.

FAQ

What is the maximum linear input range for the LTC6912IGN-1 at Gain = 1?

The maximum linear input range depends on the supply voltage. For a single 5V supply, it is typically 1.0 Vpp, and for a single 3V supply, it is typically 0.7 Vpp.

Does the LTC6912 support non-inverting gain configurations?

No, all voltage gains provided by the LTC6912 series are inverting.