PCD4440T Datasheet | NXP Semiconductors

FEATURES APPLICATIONS GENERAL DESCRIPTION PINNING INFORMATION Pinning Pin description Scrambling Power supply (VDD, VSS) Oscillator (OSCI) Splitting frequency and mode selection Serial clock input (SCL), Serial data input (SDA) Address input (A0) I2C-bus data configuration Signal input (IN), Signal output (OUT) I2C BUS INTERFACE Bit transfer Start and stop conditions System configuration Acknowledge Timing specifications APPLICATIONS HANDLING LIMITING VALUES CHARACTERISTICS Introduction Reflow soldering Wave soldering Repairing soldered joints DEFINITIONS+ LIFE SUPPORT APPLICATIONS PURCHASE OF PHILIPS I2C PONENTS 1996 Dec 20 Philips Semiconductors Product specification Analog voice scrambler/descrambler 1 FEATURES 2 APPLICATIONS - 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 ponents 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. 4 ORDERING INFORMATION TYPE NUMBER PCD4440T - 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 telemunications 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 patible with most microcontrollers and...