Texas Instruments TLC320AD50CPT

Overview

TLC320AD50CPT from Texas Instruments is a 16-bit sigma-delta audio codec IC integrating synchronous ADC and DAC paths, decimation and interpolation filters, on-chip PLL, and programmable gain amplifiers. It operates at sampling rates up to 22.05 kHz, delivers 89 dB SNR and 90 dB THD, and supports master/slave serial interface configurations for DSP interfacing in voiceband and modem applications.

For engineers reviewing the TLC320AD50CPT datasheet, TLC320AD50CPT pinout, TLC320AD50CPT application, or TLC320AD50CPT equivalent, this page provides verified technical context, package-validated pin functions, real-world use scenarios, and two confirmed alternative codecs with documented functional differences.

Technical Context

The TLC320AD50CPT implements dual sigma-delta conversion paths: a 16-bit ADC with decimation filter and a 16-bit DAC with interpolation filter. Its internal PLL generates system clocks from MCLK, supporting fs = MCLK/(128N) (PLL enabled) or fs = MCLK/(512N) (PLL bypassed), with N programmable from 1 to 8.

It features fully differential analog I/O (INP/INM, OUTP/OUTM), hardware/software reset and power-down modes, dual serial communication (primary data + secondary register access), and configurable frame-sync timing including FSD delay for multi-device synchronization. All digital I/O is TTL-compatible at DVDD = 5 V.

Key Specifications

Pinout & Package

Package: TQFP-48 (PT package), 7 mm × 7 mm, 0.5 mm pitch, thermally enhanced with exposed pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV320AIC10CP and CS42L52-CNZ, the TLC320AD50CPT uniquely supports programmable fs, hardware-triggered secondary communication (FC), and multi-slave frame-sync coordination-critical for V.34+ modem timing compliance and DSP-hosted telephony systems.

Availability

TLC320AD50CPT is available at Aetrix Electronics and suitable for V.34+ modem design, business VoIP endpoint development, and industrial voice logging systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TLC320AD50CPT 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, embedded processing, and connectivity technologies, with decades of expertise in precision signal chain solutions.

The TLC320AD50CPT belongs to TI's legacy mixed-signal audio interface product line, designed specifically for high-fidelity, low-cost voiceband conversion in telecom and DSP-coupled applications requiring deterministic timing and flexible gain control.

FAQ

What is the maximum sampling frequency supported by the TLC320AD50CPT?

The TLC320AD50CPT supports a maximum sampling frequency of 22.05 kHz, achieved when the internal PLL is enabled and N = 1 in Control Register 4 (fs = MCLK/(128 × 1)). This setting requires MCLK = 2.8224 MHz. The device also supports lower rates down to 4.88 kHz using PLL bypass mode (fs = MCLK/(512 × N)), making it suitable for V.34+ modem and narrowband voice applications. The TLC320AD50CPT maintains full 16-bit performance across its entire fs range.

Does the TLC320AD50CPT support both master and slave operation modes?

Yes, the TLC320AD50CPT supports configurable master/slave operation via the M/S pin. When M/S is high, the device acts as master-generating FS and SCLK signals and driving FSD for slave synchronization. When M/S is low, it operates as a slave-accepting FS and SCLK from an external master. The TLC320AD50CPT can support up to three slave devices in a daisy-chain configuration, and its FSD output is programmable via Control Register 3 to introduce precise inter-device delays. This capability is integral to the TLC320AD50CPT's role in multi-codec DSP systems.

What are the power supply requirements for the TLC320AD50CPT?

The TLC320AD50CPT requires separate analog and digital supplies: AVDD = 5 V (for analog section and PLL), AVSS = analog ground; DVDD = 5 V or 3 V (for digital logic), DVSS = digital ground. AVDD(PLL) and AVSS(PLL) are dedicated pins for PLL power/ground isolation. Total power dissipation is 120 mW rms in active mode and drops to 7.5 mW in hardware power-down mode (PWRDWN low). Proper PCB layout must maintain isolated analog/digital ground planes and decoupling capacitors per TI's recommended values (e.g., 0.1 µF ceramic on FILT, REFP, REFM).

How does the TLC320AD50CPT handle analog input filtering and reference stability?

The TLC320AD50CPT requires external single-pole RC antialias filters on INP/INM and AUXP/AUXM inputs, as specified in Section 2.15 of the datasheet. For reference stability, it provides dedicated REFP (3.2 V) and REFM (0 V) pins with internal bandgap circuitry; a 0.1 µF ceramic capacitor must be placed between them. Additionally, the FILT pin supplies a filtered 3.2 V node for external decoupling-also requiring a 0.1 µF ceramic capacitor. These provisions ensure stable reference voltage and low-noise analog performance critical for achieving the TLC320AD50CPT's rated 89 dB SNR.

Can the TLC320AD50CPT perform loopback testing without external hardware?

Yes, the TLC320AD50CPT supports both digital and analog loopback test modes accessible via Control Registers 1 and 2. Digital loopback routes ADC output directly to DAC input internally, verifying serial data path integrity. Analog loopback connects the DAC output back to the ADC input through internal switches, enabling end-to-end analog signal path validation. These modes are activated by register bits and require no external connections-making them ideal for production test and field diagnostics. Both loopback functions are fully supported in the TLC320AD50CPT and do not affect normal operation when disabled.