參數(shù)資料
型號： SI3225PPTX-EVB
廠商： Silicon Laboratories Inc
文件頁數(shù)： 81/112頁
文件大?。?/td> 0K
描述： BOARD EVAL W/DISCRETE INTERFACE
設計資源： Si3225PPTX-EVB Schematics/Layout
標準包裝： 1
系列： ProSLIC®
主要目的： 接口，模擬前端（AFE）
已用 IC / 零件： Si3225
已供物品： 板，CD
Si3220/25 Si3200/02
70
Rev. 1.3
Not
Recommended
fo
r N
ew
D
esi
gn
s
Table 40 outlines the hex codes corresponding to the
detected DTMF digits.
3.24. Modem Tone Detection
The Dual ProSLIC devices are capable of detecting a
2100 Hz
modem
tone
as
described
in
ITU-T
Recommendation V.8. The detection scheme can be
implemented in both transmit and receive paths and is
enabled by programming the appropriate register bit.
The detection scheme should be disabled for power
conservation after the modem tone window has passed.
Once a valid modem tone is detected, a register bit is
set accordingly, and the user can check the results by
reading the register value. A programmable debounce
interval is provided to eliminate false detection and can
be programmed in increments of 67 ms by writing to the
appropriate register.
The outputs of the 2100 Hz modem tone detectors are
located at RAM addresses 410 and 413 for the TX and
RX paths, respectively.
The contents of registers 410 and 413 indicate the
presence or absence of 2100 Hz energy. Table 41
indicates the relationship between the contents of these
RAM addresses and the level of the 2100 Hz energy
present in the corresponding signal path (TX or RX).
The threshold for declaring the presence or absence of
2100 Hz energy should be based on Table 41. A
suitable threshold for most applications is >0x20,
corresponding to a level of –15 dBm.
The following steps are used to access RAM address
410 and 413:
1. Write 0x02, 0x06, 0x0C, 0x00 to Reg. 87 (un-protect
test registers/bits)
2. Write 0x40 to Reg. 4 (access upper RAM space)
3. Write 0x02, 0x06, 0x0C, 0x00 to Reg. 87 (protect
test registers/bits)
4. For TX path use RAMAddress = 154 for the RX path
use RAMAddress = 157:
if (readRAM(RAMAddress) > 0x20)
Tone2100 Hz = 1;
else Tone2100 Hz = 0;
endif
3.25. Audio Path Processing
Unlike traditional SLICs, the Dual ProSLIC devices
integrate the codec function into the same IC. The on-
chip 16-bit codec offers programmable gain/attenuation
blocks and multiple loopback modes for self testing. The
signal path block diagram is shown in Figure 11 on page
3.25.1. Transmit Path
In the transmit path, the analog signal fed by the
external ac coupling capacitors is passed through an
anti-aliasing filter before being processed by the A/D
converter. An analog mute function is provided directly
prior to the A/D converter input. The output of the A/D
converter is an 8 kHz, 16-bit wide, linear PCM data
stream. The standard requirements for transmit path
Table 40. DTMF Hex Codes
Digit
Hex code
10x1
20x2
30x3
40x4
50x5
60x6
70x7
80x8
90x9
00xA
*0xB
#0xC
A0xD
B0xE
C0xF
D0x0
Table 41. 2100 Hz Level vs. RAM Hex Value
TIP and RING
Level
Across 600 W
(dBm)
TX Path: RAM 410 (154)
or
RX Path: RAM 413 (157)
(Hex)
+3
0x838
00x420
–3
0x20a
–6
0x107
–9
0x83
–12
0x41
–15
0x20
相關PDF資料
PDF描述
LGU2E181MELY CAP ALUM 180UF 250V 20% SNAP
SI3225DCX-EVB DAUGHTER CARD W/DISCRETE INTRFC
SK102M050ST CAP ALUM 1000UF 50V 20% RADIAL
M3TTK-3036J IDC CABLE - MSD30K/MC34G/MSD30K
SI3225DC0-EVB DAUGHTER CARD W/SI3200 INTERFACE
相關代理商/技術參數(shù)
參數(shù)描述
SI3225-X-FQ 制造商:SILABS 制造商全稱:SILABS 功能描述:DUAL PROSLIC㈢ PROGRAMMABLE CMOS SLIC/CODEC
SI3225-X-GQ 制造商:SILABS 制造商全稱:SILABS 功能描述:DUAL PROSLIC㈢ PROGRAMMABLE CMOS SLIC/CODEC
SI3226 制造商:SILABS 制造商全稱:SILABS 功能描述:Dual ProSLIC㈢ with DC-DC Controller
SI32260 制造商:SILABS 制造商全稱:SILABS 功能描述:Two complete FXS channels in 8X8 mm Perfroms all BORSCHT functions ldel for short-or long-loop applications
SI32260CBB20SL0EVB 制造商:Silicon Laboratories Inc 功能描述:BOARD EVAL SI32260-C DUAL FXS
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

*
*
*