Analog Devices Inc. LTC6912CDE-2#TRPBF

Overview

LTC6912CDE-2#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, digitally programmable gain amplifier (PGA) with independent 3-wire SPI-controlled gain settings of 0, 1, 2, 4, 8, 16, 32, and 64 V/V per channel, rail-to-rail input/output operation, 12.6 nV/√Hz input voltage noise at 50 kHz, and 115 dB total system dynamic range - deployed in precision data acquisition systems for automatic gain control and dynamic signal ranging.

For engineers reviewing the LTC6912CDE-2#TRPBF datasheet, LTC6912CDE-2#TRPBF pinout, LTC6912CDE-2#TRPBF application, or LTC6912CDE-2#TRPBF equivalent, key selection criteria include verified channel-to-channel gain matching (≤0.1 dB), hardware shutdown capability (2 µA max at 2.7 V), DFN-12 package compatibility, and guaranteed –40°C to 85°C operation for industrial embedded designs.

Technical Context

The LTC6912CDE-2#TRPBF implements two matched, inverting amplifiers with internal AGND reference generation for single-supply operation, supporting supply voltages from 2.7 V to 10.5 V total. Its 3-wire SPI interface enables independent digital gain configuration per channel without external components.

Each channel features software-selectable low-power shutdown (state 1000), wired-OR output capability enabling analog multiplexing, and DC-coupled rail-to-rail I/O with ≤2 mV offset voltage over temperature. Gain bandwidth product reaches 30 MHz at G = 64, with THD of –84 dB at 10 kHz and 1 VRMS output.

Key Specifications

Pinout & Package

Package: 12-lead (4 mm × 3 mm) plastic DFN with exposed pad connected to V– (Pin 13); requires PCB soldering for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC6912IDE-2#TRPBF and AD8253ARMZ, the LTC6912CDE-2#TRPBF offers optimal balance of dual-channel integration, 64× maximum gain, DFN-12 compactness, and industrial-grade temperature qualification - making it ideal for space-constrained, multi-sensor data loggers and portable instrumentation.

Availability

LTC6912CDE-2#TRPBF is available at Aetrix Electronics and suitable for medical instrumentation, industrial data acquisition, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC6912CDE-2#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC6912 family was designed specifically for precision, low-noise, digitally controlled analog signal conditioning in space- and power-constrained industrial and instrumentation systems - emphasizing gain accuracy, channel matching, and seamless SPI integration.

FAQ

What gain settings does the LTC6912CDE-2#TRPBF support?

The LTC6912CDE-2#TRPBF supports eight discrete gain settings per channel: 0, 1, 2, 4, 8, 16, 32, and 64 V/V, programmed independently via its 3-wire SPI interface. Gain state 0 provides >120 dB attenuation (effectively signal blocking), while all gains are inverting. The LTC6912CDE-2#TRPBF is the -2 variant, distinguishing it from the -1 variant (which offers 0, 1, 2, 5, 10, 20, 50, 100 V/V).

Does the LTC6912CDE-2#TRPBF support hardware shutdown?

No, the LTC6912CDE-2#TRPBF does not support hardware shutdown. That feature is exclusive to the GN-16 (SSOP) package variant (e.g., LTC6912CGN-2). The LTC6912CDE-2#TRPBF uses the DFN-12 package, which omits the SHDN pin. However, it fully supports software shutdown via SPI command state 1000, reducing per-channel current to 200–325 µA at 5 V.

What is the purpose of the AGND pin on the LTC6912CDE-2#TRPBF?

The AGND pin on the LTC6912CDE-2#TRPBF provides an internally generated half-supply reference voltage (e.g., 2.5 V with 5 V supply), enabling true rail-to-rail input operation in single-supply configurations without external bias networks. This eliminates external resistive dividers, improves PSRR, and simplifies system-level analog front-end design - a core feature confirmed in the LTC6912CDE-2#TRPBF datasheet Figure 1 and Applications section.

Can the LTC6912CDE-2#TRPBF outputs be wired-OR'd together?

Yes, the LTC6912CDE-2#TRPBF supports wired-OR output operation: OUTA and OUTB can be connected to a common node to implement a 2:1 analog multiplexer function. This is explicitly enabled by the device's open-loop output stage design and rail-to-rail swing capability. The LTC6912CDE-2#TRPBF datasheet confirms this in the FEATURES list and Typical Application diagram (TA01a), noting "Wired-OR Outputs Possible (2:1 Analog MUX Function)."

What is the maximum operating supply voltage for the LTC6912CDE-2#TRPBF?

The LTC6912CDE-2#TRPBF has a maximum total supply voltage of 10.5 V, defined as the potential difference between V+ and V– pins. It operates across a wide range: 2.7 V to 10.5 V total, supporting single supplies (e.g., 3.3 V, 5 V) or split supplies (e.g., ±2.5 V, ±5 V). Exceeding 10.5 V violates Absolute Maximum Ratings and risks permanent damage - a limit strictly enforced in all LTC6912CDE-2#TRPBF characterization and qualification testing.