Texas Instruments INA1651IPWR

Overview

INA1651IPWR from Texas Instruments is a single-channel SoundPlus™ high common-mode rejection audio line receiver in a 14-pin TSSOP package. It delivers 91 dB typical CMRR, –120 dB THD+N at 1 kHz (22 dBu), and 2.7 MHz bandwidth while operating from ±2.25 V to ±18 V supplies. Its integrated mid-supply reference (VMID(OUT)) enables flexible dual- or single-supply audio interface design in professional audio equipment.

For engineers reviewing the INA1651IPWR datasheet, INA1651IPWR pinout, INA1651IPWR application, or INA1651IPWR equivalent, key selection criteria include confirmed CMRR over temperature, ultra-low noise (–104.7 dBu), input impedance matching (1-MΩ differential), short-circuit protection, and EMI filtering - all validated for high-fidelity differential audio signal recovery.

Technical Context

The INA1651IPWR implements an instrumentation amplifier topology with on-die matched 10-kΩ resistors, enabling stable CMRR independent of external source impedance mismatch. Its input buffers isolate precision resistor networks from PCB layout effects, preserving rejection performance across temperature (–40°C to +125°C).

A dedicated internal supply divider generates a buffered mid-rail voltage (VMID(OUT)) with <0.35 Ω output impedance and 1.56 µV_RMS noise (20 Hz–20 kHz), supporting biasing of REF A and downstream analog circuitry without degrading CMRR. EMI filters are integrated at each input buffer to suppress RF interference.

Key Specifications

Pinout & Package

INA1651IPWR is housed in a 14-pin TSSOP package (4.40 mm × 5.00 mm) with exposed thermal pad. Pin functions are optimized for single-channel differential audio reception with integrated reference biasing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar audio line receiver applications.

Compared with INA1650IPWR and PGA2500IDR, the INA1651IPWR offers superior THD+N (–120 dB vs –110 dB), integrated EMI filtering, and a buffered mid-supply reference - making it uniquely suited for high-fidelity, low-component-count audio line reception without compromising CMRR stability over temperature.

Availability

INA1651IPWR is available at Aetrix Electronics and suitable for professional audio interfaces, studio converters, and broadcast processors requiring stable component supply, consistent CMRR performance across production lots, and long-term lifecycle support.

Supply support for INA1651IPWR 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 high-precision signal conditioning and audio IC design.

The INA165x family was engineered specifically for professional and broadcast audio systems demanding ultra-low distortion, exceptional common-mode noise immunity, and robust operation across wide temperature and supply ranges - directly addressing limitations of legacy discrete and op-amp-based line receivers.

FAQ

What is the maximum supply voltage for INA1651IPWR?

The INA1651IPWR supports a total supply voltage range of ±2.25 V to ±18 V (4.5 V to 36 V). Absolute maximum ratings specify 40 V across VCC and VEE, but operation beyond ±18 V risks exceeding specified electrical characteristics and thermal limits. For reliable long-term performance, stay within the recommended operating range of ±18 V maximum.

How does the VMID(OUT) pin function in single-supply configurations?

In single-supply configurations, the VMID(OUT) pin provides a low-impedance (0.35 Ω), low-noise (1.56 µV_RMS) mid-rail reference that biases both the REF A pin and external circuitry. Connecting REF A to VMID(OUT) enables proper common-mode rejection without external op-amps or resistor dividers - a key enabler for compact, high-performance single-supply audio designs using INA1651IPWR.

Can INA1651IPWR drive a 600-Ω load without distortion?

Yes. The INA1651IPWR delivers 350 mV from rail into 2-kΩ and 1100 mV from rail into 600-Ω loads (±18 V supply), enabling >20 VRMS output swing. At 3 VRMS into 600 Ω, THD+N remains ≤–108.1 dB (90-kHz BW), confirming clean drive capability for professional line-level standards. Output impedance <1 Ω ensures minimal interaction with reactive loads.

Why is the COM A pin required even in single-supply operation?

The COM A pin provides the return path for input buffer bias current - essential for proper amplifier core operation regardless of supply configuration. In single-supply setups, it must be connected to VMID(OUT) (not ground) to maintain correct common-mode voltage at the input stage. Leaving COM A floating causes unpredictable offset, gain error, and degraded CMRR in the INA1651IPWR.

What ESD protection does INA1651IPWR provide on its input pins?

The INA1651IPWR features integrated HBM ±4000 V and CDM ±750 V ESD protection on all pins, including inputs. Internal clamp diodes route transients to VCC/VEE rails. To prevent damage during overvoltage events (>±0.3 V beyond rails), input current must be limited to <10 mA - typically achieved with series resistors in the signal path, especially in field-deployable audio equipment using INA1651IPWR.