PCM2704C_15 Datasheet, PDF (1/47 Pages) Texas Instruments – PCM270xC Stereo Audio DAC With USB Interface, Single-Ended Headphone Output andS/PDIF Output

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Burr-Brown Audio
PCM2704C, PCM2705C, PCM2706C, PCM2707C
SBFS036B – MAY 2015 – REVISED AUGUST 2015
PCM270xC Stereo Audio DAC With USB Interface, Single-Ended Headphone Output and
S/PDIF Output
1 Features
•1 On-Chip USB Interface:
– No Dedicated Device Driver Needed
– Full-Speed Transceivers
– Fully Compliant With USB 2.0 Specification
– USB 1.1 Descriptors With USB Audio Class
Support
– Certified by USB-IF
– Partially Programmable Descriptors
– Adaptive Isochronous Transfer for Playback
– Bus-Powered or Self-Powered Operation
• Sampling Rates: 32 kHz, 44.1 kHz, and 48 kHz
• On-Chip Clock Generator With Single 12-MHz
Clock Source
• Single Power Supply:
– Bus-Powered: 5 V, Typical (V_BUS)
– 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_L > 10 kΩ, Self-
Powered
– THD + N: 0.025% R_L = 32 Ω
– SNR = 98 dB
– Dynamic Range: 98 dB
– P_O = 12 mW, R_L = 32 Ω
– Oversampling Digital Filter
– Passband 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 (Model and Setting Dependent)
– Suspend Flag
– S/PDIF Out With SCMS
– External ROM Interface (PCM2704C/6C)
– Serial Programming Interface (PCM2705C/7C)
– I²S Interface (Selectable on PCM2706C/7C)
2 Applications
• USB Headphones
• USB Audio Speaker
• USB CRT/LCD Monitor
• USB Audio Interface Box
• USB-Featured Consumer Audio Product
3 Description
The PCM270xC are TI's single-chip USB stereo
audio digital-to-analog converters (DACs) with USB
2.0 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 areas (for example, vendor ID/product ID)
through the use of an external ROM (PCM2704C and
PCM2706C) or serial peripheral interface (SPI)
(PCM2705C and PCM2707C). The PCM270xC also
employ SpAct™ architecture, TI's unique system that
recovers the audio clock from USB packet data. On-
chip analog phase-locked loops (PLLs) with SpAct
enable playback with low clock jitter.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
PCM2704C
PCM2705C
SSOP (28)
5.30 mm × 10.20 mm
PCM2706C
PCM2707C
TQFP (32)
7.00 mm × 7.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Block Diagram
USB
HID Controls
External ROM
SPI
PCM2704C/5C/6C/7C
Line Out
S/PDIF
I2S
VDD
VCCL
VCCR
VCCP
PGND
AGNDR
AGNDL
ZGND
DGND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.