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1FEATURES

234· On-Chip USB Interface:

– With Full-Speed Transceivers

– Fully Compliant with USB 2.0 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

· S/PDIF Input/Output

· Single Power Supply:

– 5 V Typical (V BUS)

· Stereo ADC:

– Analog Performance at V BUS = 5 V:

– THD+N = 0.01%

– SNR = 89 dB

– Dynamic Range = 89 dB

– Decimation Digital Filter:

– Passband Ripple = ±0.05 dB

– Stop-Band Attenuation = –65 dB

– Single-Ended Voltage Input

– Antialiasing Filter Included

– Digital HPF Included

· Stereo DAC:

– Analog Performance at VBUS = 5 V:

– THD+N = 0.005%

– SNR = 96 dB

– Dynamic Range = 93 dB

– Oversampling Digital Filter:

– Passband Ripple = ±0.1 dB

– Stop-Band Attenuation = –43 dB

– Single-Ended Voltage Output

– Analog LPF Included

· Multifunctions:

– Human Interface Device (HID) Function:

– Volume and Mute Controls

– Suspend Flag Function

· 28-Pin SSOP Package

APPLICATIONS

· USB Audio Speaker

· USB Headset

· USB Monitor

· USB Audio Interface Box

DESCRIPTION

The PCM2906B is Texas Instruments' single-chip,

USB, stereo audio codec with a USB-compliant

full-speed protocol controller and S/PDIF. The USB

protocol controller requires no software code, but the USB descriptors can be modified in some areas (for

example, vendor ID and/or product ID). The

PCM2906B 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 as

well as independent playback and record sampling

rates.