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PCD4440T Datasheet(PDF) 3 Page - NXP Semiconductors |
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PCD4440T Datasheet(HTML) 3 Page - NXP Semiconductors |
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3 / 20 page  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 I2C-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 I2C-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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Similar Description - PCD4440T |
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