TLV320AIC22

双 VOIP 编解码器

The is a dual coder/decoder codec for voice applications, including voice-over-internet protocol VOIP. It features two ADC conversion channels and two DAC conversion channels that can be connected to a handset, headset, speaker, microphone, or a subscriber line via an analog crosspoint.

The TLV320AIC22 has a flexible serial interface that allows the two channels of the TLV320AIC22 to be interfaced to a single multichannel buffered serial port McBSP of the DSP. The two channels share the digital interface at different time slots. Up to four TLV320AIC22 units can be cascaded together to allow eight channels. For control purposes, either the serial interface or the I2C interface can be used. Programmable gain amplifiers, preamplifier gain, microphone bias voltages, and analog crosspoint are programmed through the serial interface or the I2C interface. The TLV320AIC22 can be powered down, via a dedicated pin or by using software control, to reduce power dissipation.

The TLV320AIC22 is available in a 48-pin LQFP package and is characterized for operation from –40°C to 85°C.

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Two 16-Bit Analog-to-Digital Converters ADC

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Two 16-Bit Digital-to-Analog Converters DAC

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Programmable Input/Output Gain

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Analog Crosspoint to Connect the Two Coder/Decoders Codecs to Any of the I/O Ports. Controlled Through the Serial Port or the I2C Bus

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8-Bit A-Law/u-Law Companded Data or 16-Bit Linear Data Complying With G.711 Standard

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Programmable ADC and DAC Conversion Rate

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Typical 77-dB Signal-to-Noise + Distortion for ADC

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Typical 78-dB Signal-to-Noise + Distortion for the DAC

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Typical 80-dB Dynamic Range

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All Typical Sampling Rates, Such as 7.2, 8, 8.229, 9.6, 10.285, 12, 14.4, and 16 kHz Supported

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Preamplifiers for Microphone, Handset, Headset, and Speaker Phone Gain Selectable Via the Serial Port or I2C Bus

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2.5-V Microphone Bias Voltage

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Seamless Interface to a Single Multichannel Buffered Serial Port McBSP of a C54x or a C6x DSP

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Four TLV320AIC22 ICs Can Be Cascaded Together to Allow up to Eight Channels

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2s-Complement Data Format

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Differential Outputs

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Typical Low Crosstalk < –85 dB Interchannel

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Hardware/Software Power Down

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Independent Power Down for Drivers

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Single 3.3-V Supply Operation

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120-mW Typical Power Consumption

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Packaged in 48-Pin Low-Profile Quad Flatpack LQFP Package