Texas Instruments PCM2704 Manual

Burr-Brown Audio
www.ti.com.......................................................................................................................................................
SINGLE-ENDED HEADPHONE OUTPUT AND S/PDIF OUTPUT
FEATURES
1
• On-Chip USB Interface:
2345
– 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 (V
– 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% R
Self-Powered
– THD+N: 0.025% R
– SNR = 98 dB
– Dynamic Range: 98 dB
– P = 12 mW, R
O
– 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
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SpAct is a trademark of Texas Instruments.
2
System Two, Audio Precision are trademarks of Audio Precision, Inc.
3
I2S is a trademark of NXP Semiconductors.
4
All other trademarks are the property of their respective owners.
5
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
STEREO AUDIO DAC WITH USB INTERFACE,
)
BUS
> 10 kΩ,
L
= 32 Ω
L
= 32 Ω
L
SLES081F – JUNE 2003 – REVISED JANUARY 2009
– External ROM Interface (PCM2704/6)
– Serial Programming Interface (PCM2705/7)
2
– I S 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.
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.
(1) The modification of the USB descriptor through external ROM
or SPI must comply with USB-IF guidelines, and the vendor
ID must be your own ID as assigned by the USB-IF. The
descriptor also can be modified by changing a mask; contact
your representative for details.
Copyright © 2003–2009, Texas Instruments Incorporated
PCM2704, , PCM2705
PCM2706, PCM2707
(1)