1FEATURES

2345· On-Chip USB Interface:

– No Need of Dedicated Device Driver

– With Full-Speed Transceivers

– Fully Compliant With USB 1.1 Specification

– Certified by USB-IF

– Partially Programmable Descriptors

– Adaptive Isochronous Transfer for

Playback

– Bus-Powered or Self-Powered Operation

· Sampling Rate: 32, 44.1, 48 kHz

· On-Chip Clock Generator With Single 12-MHz

Clock Source

· Single Power Supply:

– Bus-Powered: 5 V, Typical (VBUS)

– Self-Powered: 3.3 V, Typical

· 16-Bit Delta-Sigma Stereo DAC

– Analog Performance at 5 V (Bus-Powered),

3.3 V (Self-Powered):

– THD+N: 0.006% RL > 10 kΩ,

Self-Powered

– THD+N: 0.025% RL = 32 Ω

– SNR = 98 dB

– Dynamic Range: 98 dB

– PO = 12 mW, RL = 32 Ω

– Oversampling Digital Filter

– Pass-Band Ripple = ±0.04 dB

– Stop-Band Attenuation = –50 dB

– Single-Ended Voltage Output

– Analog LPF Included

· Multiple Functions:

– Up to Eight Human Interface Device (HID)

Interfaces (Depending on Model and

Settings)

– Suspend Flag

– S/PDIF Out With SCMS

– External ROM Interface (PCM2704/6)

– Serial Programming Interface (PCM2705/7)

– I2S Interface (Selectable on PCM2706/7)

· Package:

– 28-Pin SSOP (PCM2704/5)

– 32-Pin TQFP (PCM2706/7)

APPLICATIONS

· USB Headphones

· USB Audio Speaker

· USB CRT/LCD Monitor

· USB Audio Interface Box

· USB-Featured Consumer Audio Product

DESCRIPTION

The PCM2704/5/6/7 is TI's single-chip USB stereo

audio DAC with USB-compliant full-speed protocol

controller and S/PDIF. The USB-protocol controller

works with no software code, but USB descriptors

can be modified in some parts (for example, vendor ID/product ID) through the use of an external ROM

(PCM2704/6), SPI (PCM2705/7), or on request. (1)

The PCM2704/5/6/7 employs SpAct™ architecture,

TI's unique system that recovers the audio clock from

USB packet data. On-chip analog PLLs with SpAct enable playback with low clock jitter.