- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373785 > ZL49031DCA (ZARLINK SEMICONDUCTOR INC) XRJAX CABLE XRJAN/XRJAX - 12FT PDF資料下載
參數(shù)資料
| 型號： | ZL49031DCA |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 信令電路 |
| 英文描述： | XRJAX CABLE XRJAN/XRJAX - 12FT |
| 中文描述： | TELECOM, DTMF SIGNALING CIRCUIT, PDSO18 |
| 封裝： | 0.300 INCH, MS-013AB, SOIC-18 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大?。?/td> | 353K |
| 代理商： | ZL49031DCA |
ZL49010/1, ZL49020/1, ZL49030/1
Data Sheet
4
Zarlink Semiconductor Inc.
output filters and squared by high gain limiting comparators. The resulting squarewave signals are applied to a
digital detection circuit where an averaging algorithm is employed to determine the valid DTMF signal. For
ZL490x0, upon recognition of a valid frequency from each tone group, the early steering (ESt) output will go high,
indicating that a DTMF tone has been detected. Any subsequent loss of DTMF signal condition will cause the ESt
pin to go low. For ZL490x1, an internal delayed steering counter validates the early steering signal after a
predetermined guard time which requires no external components. The delayed steering (DStD) will go high only
when the validation period has elapsed. Once the DStD output is high, the subsequent loss of early steering signal
due to DTMF signal dropout will activate the internal counter for a validation of tone absent guard time. The DStD
output will go low only after this validation period.
Energy Detection
The output signal from the AGC circuit is also applied to the energy detection circuit. The detection circuit consists
of a threshold comparator and an active integrator. When the signal level is above the threshold of the internal
comparator (-35dBm), the energy detector produces an energy present indication on the SD output. The integrator
ensure the SD output will remain at high even though the input signal is changing. When the input signal is
removed, the SD output will go low following the integrator decay time. Short decay time enables the signal
envelope (or cadence) to be generated at the SD output. An external microcontroller can monitor this output for
specific call progress signals. Since presence of speech and DTMF signals (above the threshold limit) can cause
the SD output to toggle, both ESt (DStD) and SD outputs should be monitored to ensure correct signal identification.
As the energy detector is multiplexed with the digital serial data output at the SD pin, the detector output is selected
at all times except during the time between the rising edge of the first pulse and the falling edge of the fourth pulse
applied at the ACK pin.
Serial Data (SD) Output
When a valid DTMF signal burst is present, ESt or DStD will go high. The application of four clock pulses on the
ACK pin will provide a 4-bit serial binary code representing the decoded DTMF digit on the SD pin output. The
rising edge of the first pulse applied on the ACK pin latches and shifts the least significant bit of the decoded digit
on the SD pin. The next three pulses on ACK pin will shift the remaining latched bits in a serial format (see Figure
5). If less than four pulses are applied to the ACK pin, new data cannot be latched even though ESt/DStD can be
valid. Clock pulses should be applied to clock out any remaining data bits to resume normal operation. Any
transitions in excess of four pulses will be ignored until the next rising edge of the ESt/DStD. ACK should idle at
logic low. The 4-bit binary representing all 16 standard DTMF digits are shown in Table .
Powerdown Mode (ZL4901x/4903x)
The ZL4901x/4903x devices offer a powerdown function to preserve power consumption when the device is not in
use. A logic high can be applied at the PWDN pin to place the device in powerdown mode. The ACK pin should be
kept at logic low to avoid undefined ESt/DStD and SD outputs (see Table 3).
F
LOW
697
697
697
770
770
770
852
852
852
F
HIGH
1209
1336
1477
1209
1336
1477
1209
1336
1477
DIGIT
b
3
0
0
0
0
0
0
0
1
1
b
2
0
0
0
1
1
1
1
0
0
b
1
0
1
1
0
0
1
1
0
0
b
0
1
0
1
0
1
0
1
0
1
1
2
3
4
5
6
7
8
9
Table 2 - Serial Decode Bit Table
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ZL49031DCB | Wide Dynamic Range DTMF Receiver |
| ZL49021DAA | Wide Dynamic Range DTMF Receiver |
| ZL49010 | Wide Dynamic Range DTMF Receiver |
| ZL49011 | CAP .1UF 100V PPS FILM 2820 2% |
| ZL49011DAA | Wide Dynamic Range DTMF Receiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZL49031DCB | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Wide Dynamic Range DTMF Receiver |
| ZL49031DCE1 | 制造商:Microsemi Corporation 功能描述: 制造商:Microsemi Corporation 功能描述:PB FREE SER PRT DTMF RCVRPWD2PIN 3.58MHZ - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC RECEIVER DTMF 16PAIR 18SOIC 制造商:Microsemi Corporation 功能描述:IC RECEIVER DTMF 16PAIR 18SOIC |
| ZL49031DCF1 | 制造商:Microsemi Corporation 功能描述:PB FREE SER PRT DTMF RCVRPWD2PIN 3.58MHZ - Tape and Reel 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC RECEIVER DTMF 16PAIR 18SOIC 制造商:Microsemi Corporation 功能描述:IC RECEIVER DTMF 16PAIR 18SOIC |
| ZL49031DDA | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Wide Dynamic Range DTMF Receiver |
| ZL49031DDB | 制造商:Microsemi Corporation 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。