Analog Devices Inc. LTC6910-3ITS8#TRMPBF

Overview

LTC6910-3ITS8#TRMPBF from Analog Devices (formerly Linear Technology) is a digitally controlled, inverting programmable gain amplifier (PGA) with 3-bit digital gain selection (0–7 V/V), rail-to-rail output, and internal half-supply reference at AGND. It operates from single or dual supplies (2.7V to 10.5V), delivers 11MHz gain-bandwidth product at G = 7, and achieves input-referred voltage noise as low as 10.5nV/√Hz - enabling precision signal conditioning in sensor front-ends and data acquisition systems.

For engineers reviewing the LTC6910-3ITS8#TRMPBF datasheet, LTC6910-3ITS8#TRMPBF pinout, LTC6910-3ITS8#TRMPBF application, or LTC6910-3ITS8#TRMPBF equivalent, key selection criteria include its fixed low-gain range (0–7×), 8-pin TSOT-23 package, ±40°C to +85°C industrial temperature grade, and compatibility with dynamic gain control in low-voltage, space-constrained analog signal chains.

Technical Context

The LTC6910-3ITS8#TRMPBF implements an inverting amplifier topology with three digital inputs (G2/G1/G0) that select one of eight discrete gain states (0, 1, 2, 3, 4, 5, 6, or 7 V/V). Its internal op-amp features rail-to-rail output swing and supports rail-to-rail input operation only at unity gain. The AGND pin provides a stable mid-supply reference (e.g., 2.5V at VS = 5V) for single-supply configurations without external biasing.

It uses a fixed-resistor feedback network architecture where gain is determined by the ratio of internal feedback and input resistors, resulting in monotonic gain steps and predictable bandwidth trade-offs: –3dB bandwidth drops from ~7MHz at G = 1 to ~1MHz at G = 7 (VS = ±5V). Input impedance varies inversely with gain (10kΩ at G = 1, 1.4kΩ at G = 7), and DC accuracy is limited by 1.5mV internal op-amp offset voltage.

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (ThinSOT™), 1mm profile, 0.65mm lead pitch, thermal pad optional. Pin 1 marked by beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4208ETA+ and AD8253ARMZ, the LTC6910-3ITS8#TRMPBF offers the lowest component count for low-gain, low-noise, single-supply PGA implementations due to its integrated AGND reference and minimal external support requirements - making it optimal for cost-sensitive, space-constrained industrial and portable instrumentation.

Availability

LTC6910-3ITS8#TRMPBF is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable data acquisition systems, and medical instrumentation requiring stable component supply, consistent parametric performance, and long-term manufacturability.

Supply support for LTC6910-3ITS8#TRMPBF 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, communications, automotive, and healthcare markets.

The LTC6910 family was designed by Linear Technology (acquired by ADI in 2017) specifically for compact, low-power, digitally programmable analog gain control - targeting applications where space, power, and simplicity outweigh the need for ultra-wide gain range or serial configuration.

FAQ

What gain settings does the LTC6910-3ITS8#TRMPBF support?

The LTC6910-3ITS8#TRMPBF supports eight discrete inverting gain settings: 0, 1, 2, 3, 4, 5, 6, and 7 V/V, selected via the 3-bit digital input code (G2/G1/G0). Gain = 0 disables the output (high-Z state), while all other codes provide monotonic, resistor-ratio-based amplification with typical gain error <±0.1dB at G = 1–7. This range is optimized for low-gain precision scaling, unlike the LTC6910-1 (up to 100×) or LTC6910-2 (up to 64×).

Does the LTC6910-3ITS8#TRMPBF require external components for single-supply operation?

No, the LTC6910-3ITS8#TRMPBF does not require external components for basic single-supply operation. Its AGND pin provides an internally generated mid-supply reference (e.g., 2.5V at VS = 5V), eliminating the need for external resistor dividers or reference ICs. Only standard supply decoupling (0.1µF ceramic at V+) and optional 1µF capacitor at AGND for noise reduction are recommended - significantly simplifying design versus discrete op-amp + DAC solutions.

What is the maximum operating temperature for the LTC6910-3ITS8#TRMPBF?

The LTC6910-3ITS8#TRMPBF is specified for operation from –40°C to +85°C, corresponding to the "I" temperature grade. This is confirmed in the Order Information table and Absolute Maximum Ratings section of the datasheet. It is not rated for extended industrial (–40°C to +125°C, "H" grade) or automotive temperature ranges, and derating or validation beyond +85°C is not supported.

How does gain setting affect bandwidth in the LTC6910-3ITS8#TRMPBF?

Bandwidth in the LTC6910-3ITS8#TRMPBF decreases inversely with gain: the gain-bandwidth product is 11MHz at G = 7, yielding ~1.6MHz –3dB bandwidth; at G = 1, bandwidth reaches ~7MHz. This relationship is verified in Figure 6910 G21 (–3dB Bandwidth vs Gain Setting). Unlike constant-GPBW amplifiers, the LTC6910-3 exhibits gain-dependent pole placement, so high-frequency response must be validated per gain code in the target application.

Can the LTC6910-3ITS8#TRMPBF drive low-impedance loads such as 500Ω?

Yes, the LTC6910-3ITS8#TRMPBF can drive 500Ω loads, but with reduced output swing and increased distortion. At VS = 5V, output swing degrades from ±2.45V (10kΩ load) to ±2.3V (500Ω load), and THD rises to –80dB at G = 4, fIN = 100kHz. For sustained 500Ω operation, verify thermal limits (θJA = 230°C/W) and consider adding an external buffer if full rail-to-rail swing or low distortion is required across all gain settings.