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1FEATURES

23· PCM2904: Without S/PDIF

· PCM2906: With S/PDIF

· On-Chip USB Interface:

– With Full-Speed Transceivers

– Fully Compliant With USB 1.1 Specification

– Certified by USB-IF

– Partially Programmable Descriptors (1)

– USB Adaptive Mode for Playback

– USB Asynchronous Mode for Record

– Bus Powered

· 16-Bit Delta-Sigma ADC and DAC

· Sampling Rate:

– DAC: 32, 44.1, 48 kHz

– ADC: 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz

· On-Chip Clock Generator With Single 12-MHz

Clock Source

· Single Power Supply: 5 V Typical (VBUS)

· Stereo ADC

– Analog Performance at VBUS = 5 V

– THD+N = 0.01%

– SNR = 89 dB

– Dynamic Range = 89 dB

– Decimation Digital Filter

– Pass-Band Ripple = ±0.05 dB

– Stop-Band Attenuation = –65 dB

– Single-Ended Voltage Input

– Antialiasing Filter Included

– Digital LCF Included

· Stereo DAC:

– Analog Performance at VBUS = 5 V

– THD+N = 0.005%

– SNR = 96 dB

– Dynamic Range = 93 dB

– Oversampling Digital Filter

– Pass-Band Ripple = ±0.1 dB

– Stop-Band Attenuation = –43 dB

– Single-Ended Voltage Output

– Analog LPF Included

· Multifunctions:

– Human Interface Device (HID) Volume ±

Control and Mute Control

– Suspend Flag

· Package: 28-Pin SSOP

APPLICATIONS

· USB Audio Speaker

· USB Headset

· USB Monitor

· USB Audio Interface Box

DESCRIPTION

The PCM2904/2906 is Texas Instruments single-chip

USB stereo audio codec with USB-compliant

full-speed protocol controller and S/PDIF (PCM2906

only). The USB protocol controller works with no

software code, but the USB descriptors can be

modified in some areas (for example, vendor

ID/product ID). The PCM2904/2906 employs SpAct?

architecture, TI's unique system that recovers the audio clock from USB packet data. On-chip analog

PLLs with SpAct enable playback and record with low

clock jitter and with independent playback and record

sampling rates.