DataSheet8.cn


PDF ( 数据手册 , 数据表 ) W6811

零件编号 W6811
描述 SINGLE CHANNEL VOICECODEC
制造商 Nuvoton Technology
LOGO Nuvoton Technology LOGO 


1 Page

No Preview Available !

W6811 数据手册, 描述, 功能
W6811 SINGLE CHANNEL
VOICECODEC
1. GENERAL DESCRIPTION
The W6811 is a general-purpose single channel PCM CODEC with pin-selectable u-Law or A-Law companding.
The device is compliant with the ITU G.712 specification. It operates off of separated analog (5V) and digital (3V)
power supplies and is available in 24-pin SOG, and SSOP package options. Functions performed include
digitization and reconstruction of voice signals, and band limiting and smoothing filters required for PCM systems.
The filters are compliant with ITU G.712 specification. W6811 performance is specified over the industrial
temperature range of 40C to +85C.
The W6811 includes an on-chip precision voltage reference and an additional power amplifier, capable of driving
300loads differentially up to a level of 6.3V peak-to-peak. The analog section is fully differential, reducing noise
and improving the power supply rejection ratio. The data transfer protocol supports both long-frame and short-
frame synchronous communications for PCM applications, and IDL and GCI communications for ISDN
applications. W6811 accepts seven master clock rates between 256 kHz and 4.096 MHz, and an on-chip pre-
scaler automatically determines the division ratio for the required internal clock.
2. FEATURES
Power supply:
Analog 4.5 5.5V
Digital 2.7 3.3V
Typical power dissipation of 25 mW, power-
down mode of 0.5 W
Fully-differential analog circuit design
On-chip precision reference of 1.575 V for a 0
dBm TLP at 600
Push-pull power amplifiers with external gain
adjustment with 300 load capability
Seven master clock rates of 256 kHz to 4.096
MHz
Pin-selectable -Law and A-Law companding
(compliant with ITU G.711)
CODEC A/D and D/A filtering compliant with
ITU G.712
Industrial temperature range (40C to +85C)
Package: 24-pin SOG, and SSOP
Pb-Free / RoHS package options available
Applications
Digital Telephone Systems
Central Office Equipment (Gateways, Switches,
Routers)
www.DataSheet.co.kr
PBX Systems (Gateways, Switches)
PABX/SOHO Systems
Local Loop card
SOHO Routers
VoIP Terminals
Enterprise Phones
ISDN Terminals
Analog line cards
Digital Voice Recorders
Revision A15
-1-
January 2011
Datasheet pdf - http://www.DataSheet4U.net/







W6811 pdf, 数据表
W6811 SINGLE CHANNEL
VOICECODEC
the AI+ pin to VDDA or VSSA. The AO pin is selected as an input when AI+ is tied to VDDA and the AI- pin is selected
as an input when AI+ is tied to VSSA (see Table 7.1).
AI+
Input Amplifier
Input
VDDA
Powered Down
AO
1.2 to VDDA-1.2
Powered Up
AI+, AI-
VSSA
Powered Down
AI-
Table 7.1 Input Amplifier Modes of operation
When the input amplifier is powered down, the input signal at AO or AI- needs to be referenced to the analog
ground voltage VAG. The output of the input amplifier is fed through a 3.4 kHz switched capacitor low pass filter to
prevent aliasing of input signals above 4 kHz, due to the sampling at 8 kHz. The output of the 3.4 kHz low pass
filter is filtered by a high pass filter with a 200 Hz cut-off frequency. The filters are designed according to the
recommendations in the G.712 ITU-T specification. From the output of the high pass filter the signal is digitized.
The signal is converted into a compressed 8-bit digital representation with either -Law or A-Law format. The -
Law or A-Law format is pin-selectable through the /A-Law pin. The compression format can be selected
according to Table 7.2.
/A-Law Pin
Format
VSSA
VDDA
A-Law
www.DataSheet.co.kr
-Law
Table 7.2. Pin-selectable Compression Format
The digital 8-bit -Law or A-Law samples are fed to the PCM interface for serial transmission at the data rate
supplied by the external bit clock BCLKT.
7.2. RECEIVE PATH
The 8-bit digital input samples for the D-to-A path are serially shifted in by the PCM interface and converted to
parallel data bits. During every cycle of the frame sync FSR, the parallel data bits are fed through the pin-
selectable -Law or A-Law expander and converted to analog samples. The mode of expansion is selected by the
/A-Law pin as shown in Table 7.2. The analog samples are filtered by a low-pass smoothing filter with a 3.4 kHz
cut-off frequency, according to the ITU-T G.712 specification. A sin(x)/x compensation is integrated with the low
pass smoothing filter. The output of this filter is buffered to provide the receive output signal RO-. The RO- output
can be externally connected to the PAI pin to provide a differential output with high driving capability at the PAO+
and PAO- pins. By using external resistors (see section 11 for examples), various gain settings of this output
amplifier can be achieved. If the transmit power amplifier is not in use, it can be powered down by connecting PAI
to VDDA.
Revision A15
- 8 - January 2011
Datasheet pdf - http://www.DataSheet4U.net/







W6811 equivalent, schematic
W6811 SINGLE CHANNEL
VOICECODEC
TFS
FST
T FSR H
B C L K T -1
PCM T
PCM R
T FSFH
T FSR S
TBCK H
TBCK L
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
TBDTD
TBDTD
T H ID
D7 D6 D5 D4 D3 D2 D1 D0
TBDTD
T
B
D
TB
TD
C
K
T H ID
D7 D6 D5 D4 D3 D2 D1 D0
M SB
TDRS
TDRH
L SB
D7 D6 D5 D4 D3 D2 D1 D0
M SB
L SB
M SB
TDRS
TDRH
L SB
D7 D6 D5 D4 D3 D2 D1 D0
M SB
L SB
BCH =0
B 1 C hannel
BCH =1
B 2 C hannel
Figure 8.3 IDL PCM Timing
SYMBOL
DESCRIPTION
1/TFS
1/TBCK
TBCKH
TBCKL
FST Frequency
BCLKT Frequency
BCLKT HIGH Pulse Width
BCLKT LOW Pulse Width
www.DataSheet.co.kr
TFSRH
BCLKT 1 Falling Edge to FST Rising Edge Hold Time
MIN
---
256
50
50
20
TFSRS
FST Rising Edge to BCLKT 0 Falling edge Setup Time
60
TFSFH
TBDTD
THID
TDRS
TDRH
BCLKT 0 Falling Edge to FST Falling Edge Hold Time
20
BCLKT Rising Edge to Valid PCMT Delay Time
Delay Time from the BCLKT 8 Falling Edge (B1 channel)
or BCLKT 18 Falling Edge (B2 Channel) to PCMT Output
High Impedance
Valid PCMR to BCLKT Falling Edge Setup Time
10
10
20
PCMR Hold Time from BCLKT Falling Edge
75
Table 8.3 IDL PCM Timing Parameters
Revision A15
- 16 -
TYP
MAX
UNIT
8 --- kHz
---
4096
kHz
--- --- ns
--- --- ns
--- --- ns
--- --- ns
--- --- ns
--- 60 ns
--- 50 ns
--- --- ns
--- --- ns
January 2011
Datasheet pdf - http://www.DataSheet4U.net/










页数 30 页
下载[ W6811.PDF 数据手册 ]


分享链接

Link :

推荐数据表

零件编号描述制造商
W6810SINGLE-CHANNEL VOICEBAND CODECWinbond
Winbond
W6810SINGLE CHANNEL VOICECODECNuvoton Technology
Nuvoton Technology
W6811SINGLE-CHANNEL VOICEBAND CODECWinbond
Winbond
W6811SINGLE CHANNEL VOICECODECNuvoton Technology
Nuvoton Technology

零件编号描述制造商
STK15C88256-Kbit (32 K x 8) PowerStore nvSRAMCypress Semiconductor
Cypress Semiconductor
NJM4556DUAL HIGH CURRENT OPERATIONAL AMPLIFIERNew Japan Radio
New Japan Radio
EL1118-G5 PIN LONG CREEPAGE SOP PHOTOTRANSISTOR PHOTOCOUPLEREverlight
Everlight


DataSheet8.cn    |   2020   |  联系我们   |   搜索  |  Simemap