Analog Devices Inc. LTC6912HGN-1#PBF

Overview

LTC6912HGN-1#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, low-noise, digitally programmable gain amplifier (PGA) with independent 3-wire SPI control per channel, offering inverting gains of 0, 1, 2, 5, 10, 20, 50, and 100 V/V. It features rail-to-rail input/output swing, 2 mV max offset voltage over –40°C to 125°C, 0.1 dB max channel-to-channel gain matching, and operates from 2.7V to 10.5V total supply. It is used in high-precision data acquisition systems requiring dynamic range up to 115 dB.

For engineers reviewing the LTC6912HGN-1#PBF datasheet, LTC6912HGN-1#PBF pinout, LTC6912HGN-1#PBF application, or LTC6912HGN-1#PBF equivalent, key selection criteria include guaranteed H-grade temperature operation (–40°C to 125°C), GN-16 SSOP package compatibility, SPI-controlled dual-channel gain independence, and low 12.6 nV/√Hz input noise at 50 kHz.

Technical Context

The LTC6912HGN-1#PBF implements two matched, fully differential-capable amplifiers with internal AGND reference generation for single-supply operation. Its 3-wire SPI interface supports independent gain programming per channel using an 8-bit command word, where nibbles Q7–Q4 and Q3–Q0 select upper/lower gain ranges - enabling precise digital gain control without external components.

Each channel supports hardware shutdown via SHDN pin (2 µA max at 2.7V) and software shutdown (state 1000), delivering <500 µA total supply current in shutdown. Gain-bandwidth product reaches 50 MHz at G = 100, and channel-to-channel isolation exceeds 89 dB at 200 kHz with G = 100, ensuring minimal crosstalk in multi-signal conditioning paths.

Key Specifications

Pinout & Package

16-pin narrow plastic SSOP (GN-16) package with exposed pad connected to V–; pin 1 marked by notch or dot. Pin 5 (SHDN) enables hardware shutdown; pins 6–8 (CS/LD, DIN, CLK) form dedicated 3-wire SPI bus; pins 1 and 16 are NC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC6912IGN-1#PBF and AD8253ARMZ, the LTC6912HGN-1#PBF uniquely combines guaranteed 125°C operation, 0 V/V attenuation capability, and 0.1 dB channel matching - making it the only option qualified for high-reliability automotive and extended-temperature industrial signal chains requiring precise dual-channel ratio preservation.

Availability

LTC6912HGN-1#PBF is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive battery monitoring, medical ECG front-ends, test equipment auto-ranging, and precision data acquisition systems requiring stable component supply across extended temperature ranges.

Supply support for LTC6912HGN-1#PBF 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 technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC6912 family was designed specifically for high-accuracy, low-noise, digitally controlled analog signal conditioning in space-constrained, thermally demanding applications - emphasizing rail-to-rail operation, SPI simplicity, and guaranteed performance across extended temperature grades.

FAQ

What is the maximum operating temperature for the LTC6912HGN-1#PBF?

The LTC6912HGN-1#PBF is specified for operation from –40°C to +125°C ambient temperature, with a maximum junction temperature of 150°C. This H-grade qualification makes it suitable for under-hood automotive applications and high-temperature industrial environments where standard I-grade (–40°C to 85°C) devices would fail.

Does the LTC6912HGN-1#PBF support non-inverting gain configurations?

No, the LTC6912HGN-1#PBF implements strictly inverting amplifier topology for both channels. All eight gain settings - 0, 1, 2, 5, 10, 20, 50, and 100 V/V - produce inverted output relative to the input. Non-inverting operation requires external configuration (e.g., inverter stage), which is not supported natively by the LTC6912HGN-1#PBF architecture.

Can the LTC6912HGN-1#PBF operate from a single 3.3V supply?

Yes, the LTC6912HGN-1#PBF operates from a single 3.3V supply (V+ = 3.3V, V– = 0V). Its rail-to-rail input and output stages, combined with the internally generated AGND reference (~1.65V), allow full-swing signal processing without external bias networks. Input common-mode range extends to 0.75V–2.55V, and output swing reaches within 20 mV of each rail under 10 kΩ load.

How does the SHDN pin interact with SPI-controlled shutdown on the LTC6912HGN-1#PBF?

The SHDN pin (Pin 5) provides hardware-level shutdown, reducing total supply current to ≤2 µA at 2.7V regardless of SPI state. SPI software shutdown (command state 1000) places each channel independently into low-power mode, drawing <500 µA total. Both modes are compatible: asserting SHDN overrides all SPI states and forces global shutdown, while SPI shutdown remains active only when SHDN is deasserted.

Is the DOUT pin on the LTC6912HGN-1#PBF functional in all gain configurations?

Yes, the DOUT pin functions as a readback output for the last 8-bit SPI command loaded via DIN, regardless of gain setting or channel selection. It echoes the exact byte written during the most recent CS/LD falling edge, enabling firmware verification of gain register updates. DOUT remains active during normal operation and does not require special initialization.