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PCM2906 Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer PCM2906
Beschreibung STEREO AUDIO CODEC WITH USB INTERFACE SINGLE ENEDE ANALOG INPUT/OUTPUT AND S/PDIF
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 30 Seiten
PCM2906 Datasheet, Funktion
BurrĆBrown Products
from Texas Instruments
PCM2904
PCM2906
SLES042A − JUNE 2002 − REVISED JUNE 2004
STEREO AUDIO CODEC WITH USB INTERFACE,
SINGLEĆENDED ANALOG INPUT/OUTPUT AND S/PDIF
FEATURES
D PCM2904: Without S/PDIF
D PCM2906: With S/PDIF
D On-Chip USB Interface:
− With Full-Speed Transceivers
− Fully Compliant With USB 1.1
Specification
− Certified by USB-IF
− Partially Programmable Descriptors(1)
− USB Adaptive Mode for Playback
− USB Asynchronous Mode for Record
− Bus Powered
D 16-Bit Delta-Sigma ADC and DAC
D Sampling Rate:
− DAC: 32, 44.1, 48 kHz
− ADC: 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz
D On-Chip Clock Generator With Single 12-MHz
Clock Source
D Single Power Supply: 5 V Typical (VBUS)
D Stereo ADC:
− Analog Performance at VBUS = 5 V
− THD+N = 0.01%
− SNR = 89 dB
− Dynamic Range = 89 dB
− Decimation Digital Filter
− Pass-Band Ripple = ±0.05 dB
− Stop-Band Attenuation = –65 dB
− Single-Ended Voltage Input
− Antialiasing Filter Included
− Digital LCF Included
D Stereo DAC:
− Analog Performance at VBUS = 5 V
− THD+N = 0.005%
− SNR = 96 dB
− Dynamic Range = 93 dB
− Oversampling Digital Filter
− Pass-Band Ripple = ±0.1 dB
− Stop-Band Attenuation = –43 dB
− Single-Ended Voltage Output
− Analog LPF Included
D Multifunctions:
− Human Interface Device (HID) Volume ±
Control and Mute Control
− Suspend Flag
D Package: 28-Pin SSOP, Lead-Free Product
APPLICATIONS
D USB Audio Speaker
D USB Headset
D USB Monitor
D USB Audio Interface Box
DESCRIPTION
The PCM2904/2906 is Texas Instruments single-chip
USB stereo audio codec with USB-compliant full-speed
protocol controller and S/PDIF (PCM2906 only). The
USB protocol controller works with no software code,
but the USB descriptors can be modified in some areas
(for example, vendor ID/product ID). The
PCM2904/2906 employs SpActarchitecture, 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 and with
independent playback and record sampling rates.
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.
(1)The descriptor can be modified by changing a mask.
SpAct is a trademark of Texas Instruments, Incorporated.
Apple. Mac, and Mac OS are trademarks of Apple Computer, Inc.
Intel is a trademark of Intel Corporation.
Microsoft, Windows, Windows Me, and Windows XP are trademarks of Microsoft Corporation.
Other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright 2004, Texas Instruments Incorporated
www.ti.com






PCM2906 Datasheet, Funktion
PCM2904
PCM2906
SLES042A − JUNE 2002 − REVISED JUNE 2004
www.ti.com
PCM2904 Terminal Functions
TERMINAL
NAME
NO.
I/O
DESCRIPTION
AGNDC
11 − Analog ground for codec
AGNDP
18 − Analog ground for PLL
AGNDX
D–
D+
22 − Analog ground for oscillator
2 I/O USB differential input/output minus(1)
1 I/O USB differential input/output plus(1)
DGND
26 − Digital ground
DGNDU
HID0
HID1
HID2
SEL0
SEL1
4 − Digital ground for USB transceiver
5 I HID key state input (mute), active high(3)
6 I HID key state input (volume up), active high(3)
7 I HID key state input (volume down), active high(3)
8 I Must be set to high(5)
9 I Must be set to high(5)
SSPND
28 O Suspend flag, active low (Low: suspend, High: operational)
TEST0
24 I Test pin, must be connected to GND
TEST1
25 O Test pin, must be left open
VBUS
VCCCI
VCCP1I
VCCP2I
VCCXI
VCOM
VDDI
VINL
VINR
VOUTL
VOUTR
XTI
3 − Connect to USB power (VBUS)
10 − Internal analog power supply for codec(4)
17 − Internal analog power supply for PLL(4)
19 − Internal analog power supply for PLL(4)
23 − Internal analog power supply for oscillator(4)
14 − Common for ADC/DAC (VCCCI/2) (4)
27 − Internal digital power supply(4)
12 I ADC analog input for L-channel
13 I ADC analog input for R-channel
16 O DAC analog output for L-channel
15 O DAC analog output for R-channel
21 I Crystal oscillator input(2)
XTO
20 O Crystal oscillator output
(1) LV-TTL level
(2) 3.3-V CMOS-level input
(3) 3.3-V CMOS-level input with internal pulldown. This pin informs the PC of serviceable control signals such as mute, volume up, or volume down,
which have no direct connection with the internal DAC or ADC. See the Interface #3 and End-Points sections.
(4) Connect a decoupling capacitor to GND.
(5) TTL Schmitt trigger, 5-V tolerant
6

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PCM2906 pdf, datenblatt
PCM2904
PCM2906
SLES042A − JUNE 2002 − REVISED JUNE 2004
ADC
0.00.10
TOTAL HARMONIC DISTORTION + NOISE
vs
SAMPLING FREQUENCY
0.00.09
0.00.08
0.00.07
0.00.06
0.00.05
0.00.04
0.00.03
30 35 40 45 50
fS – Sampling Frequency – kHz
Figure 5. THD + N at –0.5 dB vs Sampling
Frequency
www.ti.com
DYNAMIC RANGE and SNR
vs
SAMPLING FREQUENCY
95
93
91
Dynamic Range
89 SNR
87
85
30
35 40 45
fS – Sampling Frequency – kHz
Figure 6
50
DAC
0.00.08
TOTAL HARMONIC DISTORTION + NOISE
vs
FREE-AIR TEMPERATURE
0.00.07
0.00.06
0.00.05
0.00.04
0.00.03
−50
−25
0
25 50 75 100
TA – Free-Air Temperature – °C
Figure 7. THD + N at 0 dB vs Temperature
DYNAMIC RANGE and SNR
vs
FREE-AIR TEMPERATURE
98
97
SNR
96
95
Dynamic Range
94
93
92
91
90
−50
−25 0
25 50 75
TA – Free-Air Temperature – °C
Figure 8
100
All specifications at TA = 25°C, VBUS = 5 V, fs = 44.1 kHz, fIN = 1 kHz, 16-bit data, using REG103xA-A, unless otherwise noted.
12

12 Page





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