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
– Self-Powered
• 16-Bit Delta-Sigma ADC and DAC
• Sampling Rates:
– 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:
– 3.3 V Typical
• Stereo ADC:
– Analog Performance at V CCC = VCCP1 = VCCP2
= VCCX = VDD = 3.3 V:
– THD+N = 0.01%
– SNR = 89 dB
– Dynamic Range = 89 dB
– Decimation Digital Filter: full–
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 VCCC = VCCP1 = VCCP2
= VCCX = VDD = 3.3 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 and Mute Controls
– Suspend Flag Function
• 28-Pin SSOP Package

APPLICATIONS
• USB Audio Speaker
• USB Headset
• USB Monitor
• USB Audio Interface Box

DESCRIPTION
The PCM2903B 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
PCM2903B 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.