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參數資料
| 型號： | PCD4440T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Analog voice scrambler/descrambler |
| 中文描述： | TELECOM, CORDLESS, SCRAMBLER/DESCRAMBLER, PDSO8 |
| 封裝： | 7.50 MM, PLASTIC, SOT-176-1, SOP-8 |
| 文件頁數： | 3/20頁 |
| 文件大?。?/td> | 105K |
| 代理商： | PCD4440T |
1996 Dec 20
3
Philips Semiconductors
Product specification
Analog voice scrambler/descrambler
PCD4440T
1
FEATURES
Scrambler or descrambler function
Scrambling in frequency domain
Selectable split frequency (up to 10 selections per
second)
Telephony-band filtering included
No increase in bandwidth
No external components required
Small signal delay
Insensitive to distortion and group delay of transmission
channel
Control via serial I
2
C-bus
Low transfer loss of speech
Mute option
Transparent mode
High signal input impedance
Low signal output impedance
Low power consumption.
2
APPLICATIONS
Cordless telephones
Security telephones
Portable phones
Private Mobile Radio (PMR).
3
GENERAL DESCRIPTION
The PCD4440T is a silicon gate CMOS integrated circuit
intended to be used in cordless telephony, radio, and line
telecommunications products utilizing a microcontroller for
the control functions. The purpose of the device is to
prevent unauthorized ‘listening-in’ on conversations.
A major application is protection of the vulnerable radio link
between a CT0 type cordless handset and its base unit.
Analog scrambling/descrambling is based on the split
frequency method realized in a sophisticated
switched-capacitor technology. The PCD4440T is
compatible with most microcontrollers and communicates
via a two line bidirectional I
2
C-bus.
4
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
PCD4440T
SO8
plastic small outline package; 8 leads; body width 7.5 mm
SOT176-1
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