CD22354A

Features:

• Meets or Exceeds All AT&T D3/D4 Specifications and CCITT Recommendations
• Complete CODEC and Filtering Systems: No External Components for Sample-and-Hold and Auto-Zero Functions. Receive Output Filter with (SIN X)/X Correction and Additional 8kHz Suppression
• Variable Data Clocks - From 64kHz . . . . . . . . . . . . . . . . . . . . . 2.1MHz
• Receiver Includes Power-Up Click Filter
• TTL or CMOS-Compatible Logic
• ESD Protection on All Inputs and Outputs


Application

• PABX
• Central Office Switching Systems
• Accurate A/D and D/A Conversions
• Digital Telephones
• Cellular Telephone Switching Systems
• Voice Scramblers - Descramblers
• T1 Conference Bridges
• Voice Storage and Retrieval Systems
• Sound Based Security Systems
• Computerized Voice Analysis
• Mobile Radio Telephone Systems
• Microwave Telephone Networks
• Fiber-Optic Telephone Networks


Pinout




Specifications

DC Supply-Voltage, (V+) . . . . . . . . . . . . . . . . . . . . . . . . . .-0.5 to 7V
DC Supply-Voltage, (V-) . . . . . . . . . . . . . . . . . . . . . . . . . .0.5 to -7V
DC Input Diode Current,
I_IK (V_I < V- -0.5V or V_I > V+ 0.5V) . . . . . . . . . . . . . . . . . .. . .±20mA
DC Output Diode Current,
I_OK (V_I < V- -0.5V or V_O > V+ 0.5V). . . . . . . . . . . . . . . . . . . .±20mA
DC Drain Current, Per Output
I_O (V- -0.5V < V_O < V+ 0.5V) . . . . . . . . . . . . . . . . . . . . . . . .±25mA
DC Supply/Ground Current . . . . . . . . . . . . . . . . . . . . . . . . . .±50mA
Power Dissipation Per Package (P_D):
For T_A = -40 to 60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mW
For T_A = 60 to 85 . . . . . . . Derate Linearly at 8mW/ to 300mW


Description

The CD22354A and CD22357A are monolithic silicongate, double-poly CMOS integrated circuits containing the band-limiting filters and the companding A/D and D/A conversion circuits that conform to the AT&T D3/D4 specifications and CCITT recommendations. The CD22354A provides the AT&T m-law and the CD22357A provides the CCITT A-law companding characteristic.

The primary applications for the CD22354A and CD22357A are in telephone systems. These circuits perform the analog and digital conversions between the subscriber loop and the PCM highway in a digital switching system. The functional block diagram is shown below.
With flexible features, including synchronous and asynchronous operations and variable data rates, the CD22354A and CD22357A are ideally suited for PABX, central office switching system, digital telephones as well as other applications that require accurate A/D and D/A conversions and minimal conversion time.