STMicroelectronics TS472IQT

Overview

TS472IQT from STMicroelectronics is a fully-differential microphone preamplifier IC with integrated 2.0 V low-noise bias generator, active-low standby mode, and adjustable gain (0–40 dB). It operates from 2.2–5.5 V, delivers 10 nV/√Hz input-referred noise at 1 kHz, supports 40 kHz bandwidth independent of gain, and draws only 1.8 mA at 20 dB gain - optimized for high-fidelity audio capture in space-constrained portable systems.

For engineers reviewing the TS472IQT datasheet, TS472IQT pinout, TS472IQT application, or TS472IQT equivalent, key selection criteria include differential input/output architecture, 2.0 V mic bias accuracy and PSRR (>70 dB), standby current ≤1 μA, gain-setting flexibility via GS pin resistor or voltage, and QFN24 4×4 mm lead-free package compatibility with high-density PCB layouts.

Technical Context

The TS472 employs a fully-differential signal path with internal common-mode feedback to maintain output bias at VCC/2, maximizing dynamic range and rejecting power supply ripple (PSRR ≥ –46 dB single-ended, ≥ –70 dB differential) and common-mode interference. Its gain is set either by external resistor on GS pin (0–42.5 dB) or by applying >1 V to GS (fixed 20 dB).

It integrates a dedicated low-noise 2.0 V bias source (typ. 2.0 V, ±0.1 V, 2 mA capable, 100 Ω output impedance) with 80 dB PSRR at 217 Hz, and features a built-in first-order low-pass filter (R = 40 kΩ, C = 100 pF) limiting bandwidth to 40 kHz regardless of gain setting - ensuring consistent anti-aliasing performance.

Key Specifications

Pinout & Package

TS472IQT is housed in a RoHS-compliant, lead-free QFN24 4 × 4 mm package with exposed thermal pad (package code: QFN24). Pin numbering follows top-view orientation per STMicroelectronics Doc ID 11015 Rev 6.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microphone preamplifier applications.

Compared with MAX4410ETE+ and AK5703VN, TS472IQT uniquely delivers differential I/O, integrated 2.0 V bias, and 10 nV/√Hz noise in a compact QFN24 - making it optimal for battery-powered, noise-sensitive, space-constrained voice capture systems requiring analog-domain flexibility.

Availability

TS472IQT is available at Aetrix Electronics and suitable for notebook computers, video conferencing hardware, voice-controlled IoT edge devices, and professional camera audio subsystems requiring stable component supply across multi-year production cycles.

Supply support for TS472IQT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The TS472 belongs to ST's high-performance audio signal conditioning product line, engineered specifically for low-noise, low-power, differential microphone interfaces in portable and embedded voice-enabled systems.

FAQ

What is the minimum recommended bypass capacitor value for the BYP pin?

The BYP pin requires a 1 µF X7R ceramic capacitor placed within 2 mm of the pin to ensure stable internal reference voltage and achieve the specified 5 ms wake-up time. Using <1 µF increases startup delay and may cause transient distortion; larger values (>2.2 µF) do not improve performance and risk violating layout constraints.

Can TS472IQT drive a 10 kΩ differential load directly?

Yes - TS472IQT specifies R_LOAD = 10 kΩ in its electrical characteristics and maintains 0.1% THD+N and full 40 kHz bandwidth into this load. The differential output stage is designed for direct interface to standard audio ADC inputs or instrumentation amplifiers with ≥10 kΩ input impedance.

How does the GS pin behave when left floating?

A floating GS pin defaults to minimum gain (–1.5 dB), as confirmed in Table 5 and Figure 36. This state is electrically stable but rarely used in production; ST recommends tying GS to GND via resistor or to BIAS for predictable 20 dB gain to avoid unintended low-gain operation.

Is the 2.0 V bias output short-circuit protected?

No - the BIAS pin has no internal short-circuit protection. Its 100 Ω output impedance limits fault current to ~20 mA at 2 V, but sustained shorts will overheat the pin. ST recommends adding a 100 Ω series resistor and 1 µF ceramic capacitor (C3) in all designs to limit current and filter noise.