參數(shù)資料
型號： SI2400URT-EVB
廠商： Silicon Laboratories Inc
文件頁數(shù)： 18/94頁
文件大?。?/td> 0K
描述： BOARD EVAL FOR SI2400 ISOMODEM
標準包裝： 1
系列： ISOmodem®
主要目的： 電信，調制解調器
嵌入式： 否
已用 IC / 零件： SI2400
主要屬性： 雙路 RJ-11 連接至電話線路，音頻連接器
次要屬性： RS-232，TTL 串行和 USB 接口
已供物品： 板，調制解調器，電源
相關產品： SI2400-BS-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC
SI2400-FS-ND - IC ISOMODEM SYST-SIDE DAA 16SOIC
336-1093-ND - IC ISOMODEM SYSTEM-SIDE 16SOIC
其它名稱： 336-1166
Si2400
Rev. 1.3
25
5.12. Analog Codec
The Si2400 features an on-chip, voice quality codec.
The codec consists of a digital to analog converter
(DAC) and an analog to digital converter (ADC). The
sample rate for the codec is set to 9.6 kHz. When the
codec is powered on (SE4[1] [APO] = 1b), the output of
the DAC is always present on the Si2400 AOUT pin.
When the codec is powered off (APO = 0b), a PWM
output is present on the AOUT pin instead. In order to
use the ADC, one of the four GPIO pins must be
selected as an analog input (AIN) by programming SE2
(GPIO).
Figure 10 shows the various signal routing modes for
the Si2400 voice codec, which are programmed through
register SE4[5:4] (DRT). Figure 10A shows the data
routing for data mode. This is the default mode used for
modem data formats. In this configuration, AOUT
produces a mixed sum of the DSPOUT and DSPIN
signals and is typically used for call progress monitoring
through an external speaker. The relative levels of the
DSPOUT and DSPIN signals that are output on the
AOUT pin can be set through SF4[1:0] (ATL) and
SF4[3:2] (ARL).
Figure 10B shows the format for sending analog voice
across the DAA to the PSTN. AIN is routed directly
across
the
DAA
to
the
telephone
line.
In
this
configuration, AOUT produces a mixed sum of the
DSPOUT and DSPIN signals. The relative levels of the
DSPOUT and DSPIN signals that are output on the
AOUT pin can be set through registers ATL and ARL.
The DSP may process these signals if it is not in PCM
data mode. Thus, the DSP may be used in this
configuration, for example, to decode DTMF tones. This
is the mode used with the “!0” and “A0” commands.
Figure 10C shows the loopback format, which can be
used for in-circuit testing.
Figure 10D shows the codec mode. This format is
useful, for example, in voice prompting, speaker
phones,
or
any
systems
involving
digital
signal
processing. In this mode, DSPOUT is routed to both the
AOUT pin and to the telephone line, and AIN is routed
directly to DSPIN.
In all the DRT formats, the DSP must be in PCM mode
in order to pass DSPIN and DSPOUT directly to and
from TXD and RXD.
5.13. V.23 Operation/V.23 Reversing
The Si2400 supports full V.23 operation including the
V.23 reversing procedure. V.23 operation is enabled by
setting
S07
(MF1) = xx10xx00b or xx01xx10b. If
S07[5] (V23R) = 1b, then the Si2400 will transmit data at
75 bps and receive data at either 600 or 1200 bps. If
S07[4] (V23T) = 1b, then the Si2400 will receive data at
75 bps and transmit data at either 600 or 1200 bps.
S07[2] (BAUD) is the 1200 or 600 bps indicator.
BAUD = 1b will enable the 1200/600 V.23 channel to run
at 1200 bps while BAUD = 0b will enable 600 bps
operation.
When a V.23 connection is successfully established, the
modem will respond with a “c” character if the
connection is made with the modem transmitting at
1200/600 bps and receiving at 75 bps. The modem will
respond with a “v” character if a V.23 connection is
established with the modem transmitting at 75 bps and
receiving at 1200/600 bps.
The Si2400 supports the V.23 turnaround procedure.
This allows a modem that is transmitting at 75 bps to
initiate a “turnaround” procedure so that it can begin
transmitting data at 1200/600 bps and receiving data at
75 bps. The modem is defined as being in V.23 master
mode if it is transmitting at 75 bps and it is defined as
being in slave mode if the modem is transmitting at
1200/600 bps. The following paragraphs give a detailed
description of the V.23 turnaround procedure.
5.13.1. Modem in master mode
To perform a direct turnaround once a modem
connection is established, the master host goes into
online-command-mode
by
sending
an
escape
command (Escape pin activation, TIES, or ninth bit
escape) to the master modem. (Note that the host can
initiate a turnaround only if the Si2400 is the master.)
The host then sends the ATRO command to the Si2400
to initiate a V.23 turnaround and to go back to the online
(data) mode.
The Si2400 will then change its carrier frequency (from
390 Hz to 1300 Hz), and wait to detect a 390 Hz carrier
for 440 ms. If the modem detects more than 40 ms of a
390 Hz carrier in a time window of 440 ms, it will echo
the “c” response character. If the modem does not
detect more than 40 ms of a 390 Hz carrier in a time
window of 440 ms, it will hang up and echo the “N” (no
carrier) character as a response
相關PDF資料
PDF描述
CM322522-1R8JL INDUCTOR CHIP 1.8UH 3225 SMD
496837-000 CABLE TERMINATION RG/U 178,404
VI-J72-EX CONVERTER MOD DC/DC 15V 75W
6374615-8 C/A LC-SC DUP 62.5/125, 8M
VE-B12-EY-S CONVERTER MOD DC/DC 15V 50W
相關代理商/技術參數(shù)
參數(shù)描述
SI2401 制造商:SILABS 制造商全稱:SILABS 功能描述:V.22BIS ISOMODEM㈢ WITH LOW-COST DAA
SI2401-C-FS 制造商:Silicon Laboratories Inc 功能描述:
SI2401DC-EVB 功能描述:子卡和OEM板 SI2401 Daughter Card RoHS:否 制造商:BeagleBoard by CircuitCo 產品:BeagleBone LCD4 Boards 用于:BeagleBone - BB-Bone - Open Source Development Kit
SI2401-FS 功能描述:電信線路管理 IC 2400b/s System Side 3rd Gen DAA Tech RoHS:否 制造商:STMicroelectronics 產品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
Si2401FS08-EVB 功能描述:網絡開發(fā)工具 Si2401+Si3008 ISO modem Eval Board RoHS:否 制造商:Rabbit Semiconductor 產品:Development Kits 類型:Ethernet to Wi-Fi Bridges 工具用于評估:RCM6600W 數(shù)據速率:20 Mbps, 40 Mbps 接口類型:802.11 b/g, Ethernet 工作電源電壓:3.3 V
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*