Texas Instruments PCM3002EG

Overview

PCM3002EG from Texas Instruments is a monolithic 20-bit stereo audio codec integrating delta-sigma ADCs and DACs with single-ended analog input/output, 64× oversampling, software-controlled digital attenuation (256 steps), soft mute, and four programmable audio data formats (I²S, left/right-justified). It operates from a single 3-V supply in SSOP-24 and targets portable DVC applications requiring high-fidelity audio conversion.

For engineers reviewing the PCM3002EG datasheet, PCM3002EG pinout, PCM3002EG application, or PCM3002EG equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in mobile audio subsystems, and two technically documented alternative audio codecs for design flexibility and supply continuity.

Technical Context

The PCM3002EG employs multilevel delta-sigma modulation with 64× oversampling in the ADC path and 8× oversampling with digital interpolation filtering in the DAC path. Its analog front-end includes antialiasing and high-pass filters, while the digital section supports independent ADC/DAC power-down and zero-flag detection via open-drain ZFLG output.

Control is implemented via a three-wire serial mode interface (ML, MD, MC) with Schmitt-trigger inputs and internal 100-kΩ pulldown resistors. The device accepts system clocks at 256f_S, 384f_S, or 512f_S and automatically detects and divides higher frequencies to 256f_S for internal filter operation.

Key Specifications

Pinout & Package

PCM3002EG is housed in a 24-pin SSOP (Shrink Small Outline Package) with 0.64-mm lead pitch, optimized for compact PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCM3002EG, PCM3003EG removes software configurability but adds hardware-selectable de-emphasis, while TLV320AIC23BIPW trades pin-count simplicity for I²C flexibility and lower power-making each suitable for distinct architectural trade-offs in portable audio design.

Availability

PCM3002EG is available at Aetrix Electronics and suitable for digital video camcorders, portable voice recorders, and USB audio adapter subsystems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for PCM3002EG 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 leadership in high-performance audio signal chain solutions.

The PCM3002EG belongs to TI's legacy PCM audio codec family, designed specifically for cost-sensitive, battery-powered consumer electronics requiring integrated stereo ADC/DAC functionality with minimal external components.

FAQ

What is the maximum sampling rate supported by the PCM3002EG?

The PCM3002EG supports sampling rates from 4 kHz up to 48 kHz, with optimal performance at 44.1 kHz and 48 kHz. At 48 kHz, the device achieves 90-dB SNR (ADC) and 94-dB SNR (DAC), meeting CD-quality audio requirements. System clock must be 256f_S, 384f_S, or 512f_S-i.e., 12.288 MHz, 18.432 MHz, or 24.576 MHz respectively-to maintain full specification compliance. The PCM3002EG does not support rates above 48 kHz.

Does the PCM3002EG require external analog filters?

No, the PCM3002EG integrates both antialiasing filters on the ADC side and analog low-pass filters on the DAC side. The ADC antialiasing filter has a –3 dB point at 150 kHz, and the DAC analog LPF exhibits <±0.16 dB ripple up to 20 kHz. These on-chip filters eliminate the need for external passive RC networks in most portable applications, reducing BOM count and PCB area-confirmed in TI SBAS079A Figure 28 and Figure 39.

How is digital audio format selection implemented on the PCM3002EG?

Digital audio format selection on the PCM3002EG is performed exclusively through software control using the three-wire mode interface (ML, MD, MC pins). Register 3 configures one of four supported formats: Format 0 (16-bit right-justified), Format 1 (20-bit right-justified), Format 2 (20-bit left-justified), or Format 3 (20-bit I²S). This differs from the hardware-based 20BIT pin used on PCM3003EG, giving the PCM3002EG greater runtime flexibility in MCU-driven systems.

What is the function of the ZFLG pin on the PCM3002EG?

ZFLG (Pin 16) is an open-drain zero-flag output that asserts active-low when the PCM3002EG detects bipolar zero code on either ADC or DAC data paths. It serves as a hardware indicator for silence detection, enabling low-power wake-up triggers or automatic gain control decisions without CPU polling. An external pull-up resistor is required, and its behavior is documented in TI SBAS079A Pin Assignments table and Figure 46 waveform diagrams.

Can the PCM3002EG operate from a 2.5-V supply?

Yes, the PCM3002EG supports operation from 2.7 V to 3.6 V per recommended conditions, but 2.5 V falls below the absolute minimum. At 2.7 V, SNR degrades slightly (e.g., DAC SNR drops from 94 dB to ~92 dB), and THD+N increases marginally. Operation at 2.5 V is outside specification and may cause undefined behavior, including failure of the internal power-on reset circuit (which requires VDD > 2.2 V with SYSCLK active). For reliable function, maintain VDD ≥ 2.7 V across temperature and load.