描述 Description

The TLV320AIC22C contains two coders/decoders (codecs) for voice applications, including voice over internet protocol (VoIP). It features two analog-to-digital converter (ADC) channels and two digital-to-analog converter (DAC) channels that can be connected to a handset, headset, speaker, microphone, or a subscriber line via an analog crosspoint.
The TLV320AIC22C has a flexible serial interface that allows the two channels of the TLV320AIC22C to be interfaced to a single multichannel buffered serial port (McBSP) of the external digital signal processor (DSP). The two channels share the digital interface at different time slots. Up to four TLV320AIC22C units can be cascaded together to obtain eight channels. For control purposes, either the serial interface or the inter-integrated circuit (I2C) interface can be used. Programmable-gain amplifiers (PGAs), preamp gain, microphone bias voltages, and analog crosspoint are programmed through the serial interface or the I2C interface. The TLV320AIC22C can be powered down, via a dedicated terminal or by using software control, to reduce power dissipation.
The TLV320AIC22C is available in a 48-terminal LQFP package and is characterized for operation from ?40°C to 85°C.

特性 Features

? Two 16-Bit Analog-to-Digital Converters (ADCs)
? Two 16-Bit Digital-to-Analog Converters (DACs)
? Programmable Input/Output Gain
? Analog Crosspoint to Connect the Two Coders/Decoders (Codecs) to Any of the I/O Ports ? ??Controlled Through the Serial Port or the Inter-Integrated Circuit (I2C) Bus
? 8-Bit A-Law/μ-Law Companded Data or 16-Bit Linear Data Complying With G.711 Standard
? Filters Comply With G.712 and G.722 Standards
? Programmable Analog-to-Digital and Digital-to-Analog Conversion Rate
? Typical 77-dB Signal-to-Noise + Distortion for ADC
? Typical 78-dB Signal-to-Noise + Distortion for DAC
? Supports 8- and 16-kHz Sampling Rates
? Preamplifiers for Microphone, Handset, Headset, and Speakerphone Gain Selectable Via the Serial Port or I2C Bus
? 2.5-V Microphone Bias Voltage
? Seamless Interface to a Single Multichannel Buffered Serial Port (McBSP) of a C54x? or a C6x Digital Signal Processor (DSP)
? Four TLV320AIC22C ICs Can Be Cascaded Together to Allow up to Eight Channels
? 2s-Complement Data Format
? Differential Outputs
? Typical Low Crosstalk C54x and TMS320C54x are trademarks of Texas Instruments Incorporated.