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.