TCM320AC46

• Single 5-V Operation
• Low Power Consumption: Operating Mode . . . 55 mW Typ Standby Mode . . . 8 mW Typ Power-Down Mode . . . 3 mW Typ
• Combined ADC, DAC, and Filters
• Extended Variable-Frequency Operation Pass-Band up to 10 kHz
• Electret Microphone Bias Reference Voltage Available
• Directly Drives a Piezo Speaker
• Compatible With All DSPs
• Selectable Between 8-Bit, m-Law Companded and 13-Bit Linear Conversion
• Programmable Volume Control in Linear Mode
• Designed for Standard 2.048-MHz Master Clock for U.S. Analog, U.S. Digital, CT2, Battery-Powered Telephones

Supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to 7 V
Output voltage range at DOUT, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to 7 V
Input voltage rangeat DIN, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to 7 V
Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C


† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: Voltage value is with respect to GND.

The general-purpose audio interface for digital signal processors (DSPs) TCM320AC46 is designed to perform the transmit encoding (A/D conversion) and receive decoding (D/A conversion) together with transmit and receive filtering for voice-band audio systems. In particular, cellular telephone systems are targeted; however, this integrated circuit can function in several systems, including digital audio, multimedia telecommunications, noise cancellation, and other data acquisition.

The converted data TCM320AC46 is available in two formats. The formats are pin selectable between companded and linear. When the device is in the companded mode, data is transmitted and received in eight-bit words. When the linear mode is selected, 13 bits of data are sent and received, padded with trailing zeros or volume control bits to provide a 16-bit word.

The transmit section TCM320AC46 is designed to directly interface with an electret microphone element. A reference voltage equal to VCC/2, called VMID, is used to develop the midlevel virtual ground for all the amplifier circuits and the  microphone bias circuit. A reference voltage called MICBIAS can be used to supply bias current for the microphone. The microphone input signal (MICIN) is buffered and amplified with provision for setting the amplifier gain to accommodate a range of signal input levels. The amplified signal is passed through antialiasing and band-pass filters. The filtered signal is then input to a compressing analog-to-digital converter (COADC) if companded mode TCM320AC46 is selected; otherwise, the analog-to-digital converter performs a linear conversion.