Texas Instruments INA350CDSIDSGR

Overview

INA350CDSIDSGR from Texas Instruments is a selectable-gain instrumentation amplifier optimized for low-power, space-constrained 10-bit to 14-bit data acquisition systems. It provides G = 30 or G = 50 gain options via the GS pin, delivers 95 dB typical CMRR, 0.075% typical gain error at G = 30, and operates from 1.8 V to 5.5 V supply with 100 µA typical quiescent current - enabling use in wearable fitness monitors and battery-powered pressure sensors.

For engineers reviewing the INA350CDSIDSGR datasheet, INA350CDSIDSGR pinout, INA350CDSIDSGR application, or INA350CDSIDSGR equivalent, this page delivers verified package mapping (8-pin WSON/DSG), confirmed gain-select logic thresholds, real-world settling time (57 µs to 0.01% at G = 30), EMI rejection (96 dB at 1 GHz), and validated alternatives for bridge-sensing signal chains.

Technical Context

The INA350CDSIDSGR uses a three-amplifier architecture with precision-matched on-die resistors to eliminate external gain-setting components. Its gain select (GS) pin toggles between G = 30 (logic low) and G = 50 (logic high), with no-connect defaulting to G = 50 - enabling flexible configuration without resistor networks.

It integrates a shutdown function (SHDN pin) that reduces quiescent current to 0.7–1.25 µA, supports rail-to-rail output swing within 15 mV of supply rails, and drives up to 500 pF capacitive load with <20% overshoot - making it suitable for direct ADC interfacing in analog input modules.

Key Specifications

Pinout & Package

INA350CDSIDSGR is packaged in an 8-pin WSON (DSG) package measuring 2.0 mm × 2.0 mm with exposed thermal pad connected to V−. This ultra-small footprint saves board area in space-constrained designs such as implantable sensors and compact IoT nodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA350CDSIDSGR, INA333AIDRGT offers lower power and higher gain but lacks selectable gain, while AD8420ARMZ requires external components and consumes >3× more current - making INA350CDSIDSGR optimal for cost-sensitive, space-constrained, and gain-flexible 10–14-bit systems.

Availability

INA350CDSIDSGR is available at Aetrix Electronics and suitable for bridge network sensing, wearable fitness monitors, blood glucose monitoring, and analog input modules requiring stable component supply across automotive, industrial, and medical device production cycles.

Supply support for INA350CDSIDSGR 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

Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The INA350 product line targets cost- and size-sensitive instrumentation applications - delivering integrated gain resistors, selectable gain, and ultra-low power to replace discrete op-amp + resistor implementations in 10–14-bit data acquisition systems.

FAQ

What gain options does the INA350CDSIDSGR support, and how are they selected?

The INA350CDSIDSGR supports two gain options: G = 30 and G = 50. These are selected using the GS pin: logic low (≤0.2 V above V−) selects G = 30, logic high (≥1 V above V−) selects G = 50, and no-connect defaults to G = 50. This eliminates external resistors while maintaining flexibility in production and field calibration. The INA350CDSIDSGR datasheet confirms these thresholds and behavior across –40°C to 125°C.

Does the INA350CDSIDSGR require external gain-setting resistors?

No, the INA350CDSIDSGR does not require external gain-setting resistors. It integrates precision-matched thin-film resistors internally, enabling its selectable G = 30/G = 50 functionality. This reduces bill-of-materials cost, PCB area, and assembly complexity versus discrete instrumentation amplifier designs. The INA350CDSIDSGR specification sheet explicitly states "removing the need for precise or closely-matched external resistors" as a core design benefit.

What is the maximum capacitive load the INA350CDSIDSGR can drive while maintaining stability?

The INA350CDSIDSGR can drive up to 500 pF with less than 20% overshoot under typical conditions (VOUT = 100 mV step, VS = 5.5 V, G = 10). At G = 30, stability margin decreases slightly but remains adequate for most 10–14-bit ADC input capacitances (typically 10–20 pF). For heavier loads, a series isolation resistor (e.g., 50 Ω) restores phase margin - confirmed in Figure 7-39 and 7-40 of the INA350CDSIDSGR datasheet.

How does the shutdown feature of the INA350CDSIDSGR reduce system power consumption?

The SHDN pin disables the INA350CDSIDSGR's internal amplifiers, reducing quiescent current from 100 µA typical to 0.7–1.25 µA typical. This enables aggressive power cycling in battery-operated devices like wearable fitness monitors, where the INA350CDSIDSGR can be activated only during sensor sampling intervals. The INA350CDSIDSGR's 4 µs disable time and 100 µs enable time ensure rapid response without compromising energy savings.

Is the INA350CDSIDSGR suitable for operation from a single 1.8-V supply?

Yes, the INA350CDSIDSGR is fully specified for 1.8-V single-supply operation (±0.9 V dual-supply), with all key parameters - including CMRR (94 dB at VS = 3.3 V), gain error, and output swing - guaranteed across the full 1.8–5.5 V range. Its 100 µA quiescent current and rail-to-rail output (within 15 mV of rails) make it ideal for coin-cell or energy-harvesting systems where low-voltage operation is mandatory. This is verified in Section 7.3 (Recommended Operating Conditions) of the INA350CDSIDSGR datasheet.