Analog Devices Inc. LTC6912CDE-1#TRPBF

Overview

LTC6912CDE-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, digitally programmable gain amplifier (PGA) with independent 3-wire SPI-controlled gain selection across eight discrete inverting voltage gains: 0, 1, 2, 5, 10, 20, 50, and 100 V/V. It features rail-to-rail input/output operation, 2 mV max offset voltage over –40°C to 85°C, 0.1 dB max channel-to-channel gain matching, and 12.6 nV/√Hz input voltage noise density at 50 kHz. It is used in precision data acquisition systems requiring dynamic range optimization and automatic gain control.

For engineers reviewing the LTC6912CDE-1#TRPBF datasheet, LTC6912CDE-1#TRPBF pinout, LTC6912CDE-1#TRPBF application, or LTC6912CDE-1#TRPBF equivalent, key selection criteria include guaranteed gain accuracy at high settings (e.g., ±0.2 dB at G=100), hardware shutdown capability (2 µA max at 2.7 V), DFN-12 package thermal performance (θ_JA = 160°C/W), and compatibility with single-supply (2.7 V to 5.5 V) or dual-supply (±2.5 V) configurations.

Technical Context

The LTC6912CDE-1#TRPBF implements two matched, low-noise, inverting amplifiers sharing a common AGND reference node generated internally for single-supply operation. Gain is set via an 8-bit SPI register per channel, where bits Q3–Q0 define the gain code and Q7–Q4 are reserved or unused (per Table 1). All gains are inverting; no non-inverting configuration is supported.

Its architecture enables wired-OR analog multiplexing by connecting OUTA and OUTB externally, and supports software shutdown (state 1000) and hardware shutdown via SHDN pin (GN-16 only - not applicable to DFN-12). The device maintains >10 MΩ input resistance at gain = 0 or shutdown state, dropping to 1 kΩ at G = 100, with output impedance scaling linearly from 0.4 Ω (G = 0) to 30 Ω (G = 100).

Key Specifications

Pinout & Package

12-lead DFN package (4 mm × 3 mm) with exposed thermal pad connected to V– (Pin 13, not counted in 12-pin count); requires PCB soldering of exposed pad for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel programmable gain amplifier applications.

Compared with LTC6912IDE-1#TRPBF and AD8253ARMZ, the LTC6912CDE-1#TRPBF offers unique dual-channel gain independence, G=0 attenuation mode, and DFN-12 thermal efficiency - making it optimal for space-constrained, multi-sensor data loggers requiring matched analog paths.

Availability

LTC6912CDE-1#TRPBF is available at Aetrix Electronics and suitable for data acquisition systems, automatic test equipment, and portable instrumentation requiring stable component supply, consistent parametric performance across production lots, and long-term lifecycle support.

Supply support for LTC6912CDE-1#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC6912 family was designed specifically for precision, low-noise, digitally controlled analog signal conditioning - targeting applications where gain agility, channel matching, and DC accuracy are critical, such as medical instrumentation and scientific measurement.

FAQ

What gain settings does the LTC6912CDE-1#TRPBF support?

The LTC6912CDE-1#TRPBF supports eight discrete inverting voltage gains: 0, 1, 2, 5, 10, 20, 50, and 100 V/V. Gain is selected per channel via an 8-bit SPI register (Q3–Q0), with all settings verified across –40°C to 85°C. G=0 provides maximum attenuation (–120 dB), useful for input protection or blanking.

Does the LTC6912CDE-1#TRPBF support rail-to-rail input and output operation?

Yes, the LTC6912CDE-1#TRPBF supports rail-to-rail input voltage range and rail-to-rail output voltage swing under all supply conditions (2.7 V to 10.5 V total). At VS = 2.7 V, output swing is within 12 mV of each rail into 10 kΩ; at VS = 5 V, it is within 15–20 mV - enabling full dynamic range utilization with 3.3 V or 5 V ADCs.

Is hardware shutdown available on the LTC6912CDE-1#TRPBF?

No - hardware shutdown via the SHDN pin is only available on the GN-16 (SSOP) package variant (e.g., LTC6912CGN-1). The LTC6912CDE-1#TRPBF uses the 12-lead DFN package, which omits the SHDN pin. Power reduction is achieved via software shutdown (SPI state 1000), drawing ≤255 µA per channel at 2.7 V.

What is the purpose of the AGND pin on the LTC6912CDE-1#TRPBF?

The AGND pin on the LTC6912CDE-1#TRPBF provides an internally generated half-supply reference voltage (e.g., 2.5 V at VS = 5 V), essential for single-supply operation. It must be decoupled with a 1 µF capacitor to ensure stability and low-noise performance. This eliminates external reference components and simplifies biasing for AC-coupled sensor interfaces.

How does channel-to-channel isolation perform on the LTC6912CDE-1#TRPBF?

Channel-to-channel isolation on the LTC6912CDE-1#TRPBF is 113 dB at G = 1, 108 dB at G = 10, and 89 dB at G = 100 (f = 200 kHz, VS = 5 V). This high isolation is achieved through matched internal topology and requires proper PCB layout - including separate AGND/DGND planes and minimized inter-channel coupling - to maintain specified performance in sensitive multi-channel systems.