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參數(shù)資料
| 型號(hào)： | ZL49031 |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | Wide Dynamic Range DTMF Receiver |
| 中文描述： | 寬動(dòng)態(tài)范圍的DTMF接收器 |
| 文件頁數(shù)： | 3/14頁 |
| 文件大小： | 353K |
| 代理商： | ZL49031 |
ZL49010/1, ZL49020/1, ZL49030/1
Data Sheet
3
Zarlink Semiconductor Inc.
Functional Description
The ZL490xxs are high performance and low power consumption DTMF receivers. These devices provide wide
dynamic range DTMF detection and a serial decoded data output. These devices also incorporate an energy
detection circuit. An input voiceband signal is applied to the devices via a series decoupling capacitor. Following
the unity gain buffering, the signal enters the AGC circuit followed by an anti-aliasing filter. The bandlimited output
is routed to a dial tone filter stage and to the input of the energy detection circuit. A bandsplit filter is then used to
separate the input DTMF signal into high and low group tones. The high group and low group tones are then
verified and decoded by the internal frequency counting and DTMF detection circuitry. Following the detection
stage, the valid DTMF digit is translated to a 4-bit binary code (via an internal look-up ROM). Data bits can then be
shifted out serially by applying external clock pulses.
Automatic Gain Control (AGC) Circuit
As the device operates on a single power supply, the input signal is biased internally at approximately VDD/2. With
large input signal amplitude (between 0 and approximately -30dBm for each tone of the composite signal), the AGC
is activated to prevent the input signal from being clipped. At low input level, the AGC remains inactive and the
input signal is passed directly to the hardware DTMF detection algorithm and to the energy detection circuit.
Filter and Decoder Section
The signal entering the DTMF detection circuitry is filtered by a notch filter at 350 and 440 Hz for dial tone rejection.
The composite dual-tone signal is further split into its individual high and low frequency components by two 6
th
order switched capacitor bandpass filters. The high group and low group tones are then smoothed by separate
18
8
8
V
DD
Positive Power Supply (5V Typ.)
Performance of the device can be
optimized by minimizing noise on the supply rails. Decoupling
capacitors across V
DD
and V
SS
are therefore recommended.
No Connection.
Pin is unconnected internally.
1,5,7,8,
10, 12,
14,16,
17
3
-
-
NC
-
2
PWDN
Power Down Input.
A logic high on this pin will power down the
device to reduce power consumption. This pin is pulled down
internally and can be left open if not used. ACK pin should be at logic
’0’ to power down device.
Device
Type
8 Pin
18 Pin
20 Pin
PWDN
2 Pin
OSC
Ext
CLK
ESt
DStD
ZL49010
ZL49011
ZL49020
ZL49021
ZL49030
ZL49031
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Table 1 - Summary of ZL490x0/1 Product Family
Pin Description (continued)
Pin #
4902x
Name
Description
4903x
4901x
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ZL49031DDA | Wide Dynamic Range DTMF Receiver |
| ZL49031DDB | Wide Dynamic Range DTMF Receiver |
| ZL49030DDA | Wide Dynamic Range DTMF Receiver |
| ZL49030DDB | Wide Dynamic Range DTMF Receiver |
| ZL50012 | Flexible 512-ch Digital Switch |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZL49031DCA | 制造商:Microsemi Corporation 功能描述: |
| 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 |
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