Texas Instruments INA848ID

Overview

INA848ID from Texas Instruments is a fixed-gain (2000 V/V), ultra-low-noise (1.5 nV/√Hz max) instrumentation amplifier optimized for high-precision, high-bandwidth differential signal conditioning in medical and test equipment. It features 2.8 MHz bandwidth, 45 V/µs slew rate, and operates from ±4 V to ±18 V dual supply or 8–36 V single supply across –40°C to +125°C.

For engineers reviewing the INA848ID datasheet, INA848ID pinout, INA848ID application, or INA848ID equivalent, this page delivers verified specifications, internal node access for filter integration, precision super-beta input performance, and real-world implementation guidance for ECG, ultrasound, and semiconductor test systems.

Technical Context

The INA848ID uses a current-feedback topology with a two-stage gain architecture: first-stage gain of 200 V/V followed by a difference amplifier stage with 10 V/V gain, yielding total fixed gain of 2000 V/V. Its super-beta bipolar input transistors deliver 25 nA typical input bias current and 0.45 µV/°C max offset drift.

Internal resistor matching enables 132 dB minimum CMRR across full input voltage range and 5 ppm/°C max gain drift. Filter terminals (+FL, –FL) provide direct access between gain stages for RC or RLC filtering without external op-amps.

Key Specifications

Pinout & Package

INA848ID is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size) with standard JEDEC MS-012AC footprint and 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA821ID and INA819ID, the INA848ID delivers superior noise performance (1.5 vs. 7–8 nV/√Hz) and bandwidth (2.8 MHz vs. 1.2–1.5 MHz) at the expense of higher quiescent current-making it the optimal choice for mains-powered, high-fidelity signal chains demanding maximum dynamic range.

Availability

INA848ID is available at Aetrix Electronics and suitable for electrocardiogram (ECG) monitors, ultrasound scanners, semiconductor parametric testers, and vibrational analysis systems requiring stable component supply, long-term production continuity, and guaranteed traceability.

Supply support for INA848ID 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 specializing in analog and embedded processing technologies, with decades of expertise in precision signal chain design.

The INA848ID belongs to TI's high-performance instrumentation amplifier product line, engineered specifically for ultra-low-noise, high-bandwidth medical diagnostics, automated test equipment, and precision industrial sensing.

FAQ

What is the exact gain setting and tolerance of the INA848ID?

The INA848ID has a fixed gain of exactly 2000 V/V, achieved through laser-trimmed internal thin-film resistors. Total gain error is specified at 0.15% maximum over temperature, and gain drift is limited to 5 ppm/°C-significantly tighter than discrete-resistor-based alternatives. This precision eliminates calibration overhead in production test systems using the INA848ID.

Can the INA848ID operate from a single 12-V supply?

Yes, the INA848ID supports single-supply operation from 8 V to 36 V. At 12 V, it delivers full performance: 2.8 MHz bandwidth, 1.5 nV/√Hz noise, and 132 dB CMRR, provided the reference pin (REF) is biased to a stable mid-rail voltage (e.g., 6 V) using a low-impedance source. The INA848ID's input common-mode range extends to within 2.5 V of each rail, enabling robust operation in 12-V systems.

How do the +FL and –FL pins function in the INA848ID?

The +FL and –FL pins expose the internal node between the first (G = 200) and second (G = 10) gain stages of the INA848ID. They allow direct insertion of passive RC or RLC networks to implement differential low-pass, high-pass, or band-stop filtering-without adding external op-amps or degrading CMRR. For example, a 1-nF capacitor between +FL and –FL creates a 26.5 kHz –3-dB point, making the INA848ID ideal for ECG 50/60 Hz rejection.

What is the recommended layout practice for the REF pin on the INA848ID?

The REF pin of the INA848ID must be driven by a source with ≤5 Ω output impedance to preserve CMRR >132 dB. A dedicated low-noise op-amp buffer (e.g., OPA197) is strongly recommended-even for simple resistor dividers. Place the buffer within 5 mm of the INA848ID, use a solid ground plane beneath both devices, and bypass the REF net with a 0.1 µF ceramic capacitor directly to ground. Avoid routing sensitive analog traces near the REF trace on the INA848ID PCB.

Does the INA848ID require external protection diodes on its inputs?

No-inputs of the INA848ID are internally protected to ±20 V beyond supply rails, per absolute maximum ratings. However, if input transients exceed ±20 V or fault currents exceed 10 mA, external series resistors (calculated per Equation 1 in the datasheet) are required to limit current into the internal protection diodes. For standard ECG or DAQ use with guarded inputs, no external protection is needed; the INA848ID's integrated protection suffices for most medical and industrial applications.