- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄15868 > SI3210PPTX-EVB (Silicon Laboratories Inc)BOARD EVALUATION FOR SI3210 PDF資料下載
參數(shù)資料
| 型號： | SI3210PPTX-EVB |
| 廠商： | Silicon Laboratories Inc |
| 文件頁數(shù)： | 93/148頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR SI3210 |
| 標準包裝： | 1 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁當前第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁
Si3210/Si3211
Rev. 1.61
49
Not
Recommended
fo
r N
ew
D
esi
gn
s
2.6. DTMF Detection
The dual-tone multi-frequency (DTMF) tone signaling
standard is also known as touch tone. It is an in-band
signaling
system
used
to
replace
the
pulse-dial
signaling standard. In DTMF, two tones are used to
generate a DTMF digit. One tone is chosen from four
possible row tones, and one tone is chosen from four
possible column tones. The sum of these tones
constitutes one of 16 possible DTMF digits.
2.6.1. DTMF Detection Architecture
DTMF detection is performed using a modified Goertzel
algorithm to compute the dual frequency tone (DFT) for
each of the eight DTMF frequencies as well as their
second harmonics. At the end of the DFT computation,
the squared magnitudes of the DFT results for the eight
DTMF fundamental tones are computed. The row
results are sorted to determine the strongest row
frequency; the column frequencies are sorted as well.
At the completion of this process, a number of checks
are made to determine whether the strongest row and
column tones constitute a DTMF digit.
The detection process is performed twice within the
45 ms minimum tone time. A digit must be detected on
two
consecutive
tests
following
a
pause
to
be
recognized as a new digit. If all tests pass, an interrupt
is generated, and the DTMF digit value is loaded into
the DTMF register. If tones occur at the maximum rate
of 100 ms per digit, the interrupt must be serviced within
85 ms so that the current digit is not overwritten by a
new one. There is no buffering of the digit information.
2.7. Audio Path
Unlike traditional SLICs, the codec function is integrated
into the ProSLIC. The 16-bit codec offers programmable
gain/attenuation blocks and several loopback modes.
The signal path block diagram is shown in Figure 25.
2.7.1. Transmit Path
In the transmit path, the analog signal fed by the
external ac coupling capacitors is amplified by the
analog transmit amplifier, ATX, prior to the A/D
converter. The gain of the ATX is user-selectable to one
of mute/–3.5/0/3.5 dB options. The main role of ATX is
to coarsely adjust the signal swing to be as close as
possible to the full-scale input of the A/D converter in
order to maximize the signal-to-noise ratio of the
transmit path. After passing through an anti-aliasing
filter, the analog signal is processed by the A/D
converter, producing an 8 kHz, 16-bit wide, linear PCM
data stream. The standard requirements for transmit
path
attenuation
for
signals
above
3.4 kHz
are
implemented as part of the combined decimation filter
characteristic of the A/D converter. One more digital
filter is available in the transmit path: THPF. THPF
implements the high-pass attenuation requirements for
signals below 65 Hz. The linear PCM data stream
output from THPF is amplified by the transmit-path
programmable gain amplifier, ADCG, which can be
programmed from –
dB to 6 dB. The DTMF decoder
can receive the linear PCM data stream at this point to
perform the digit extraction when enabled by the user.
The final step in transmit path signal processing is the
user-selectable A-law or -law compression, which can
reduce the data stream word width to 8 bits. Depending
on the PCM_Mode register selection, every 8-bit
compressed serial data word will occupy one time slot
on the PCM highway, or every 16-bit uncompressed
serial data word will occupy two time slots on the PCM
highway.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| GBM31DCSN | CONN EDGECARD 62POS DIP .156 SLD |
| RP15-2415DF/P-HC | CONV DC/DC 15W 18-36VIN +/-15V |
| MAX6439UTAITD7+T | IC BATTERY MON SNGL SOT23-6 |
| RP15-2415DF/N-HC | CONV DC/DC 15W 18-36VIN +/-15V |
| GBM31DCSH | CONN EDGECARD 62POS DIP .156 SLD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI3210-QFN | 制造商:SILABS 制造商全稱:SILABS 功能描述:Perfroms all BORSCHT functions DC-DC controller provides tracking battery fromm a 3.3-35V input |
| SI3210-TSSOP | 制造商:SILABS 制造商全稱:SILABS 功能描述:Perfroms all BORSCHT functions DC-DC controller provides tracking battery fromm a 3.3-35V input |
| SI3211 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION |
| Si3211-BT | 功能描述:電信線路管理 IC Single-Channel SLIC/ Codec RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| SI3211-BTR | 制造商:Silicon Laboratories Inc 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。