The TLC320AD57 is a stereo sigma-delta Analog-to-Digital Converter capable of 48 K samples/sec. with 18-bit resolution. The device consists of two synchronous conversion paths utilizing a 64x oversampling sigma-delta technique to provide a high resolution, low noise ADC.
The TLC320AD57 provides differential inputs to the two independent channels for improved signal/noise ratio (97 dB), with total harmonic distortion plus noise (THD + N) of 91 dB minimum. The device also integrates the decimation filter, analog filtering and timing and control functions making it the ideal analog interface circuit for direct DSP interface in business audio, multimedia audio and industrial process control applications.
The device consumes 225 mW maximum from a single 5-V supply. Separate power down controls for both the analog and digital circuitry reduce this to less than 1 mW for power conscious users. In addition, the small footprint and profile of the packaging make the device suitable for space limited applications. The TLC320AD57 is available today from Texas Instruments and our authorized distributors.
The TLC320AD57 offers maximum flexibility by giving the user control over key system function. MODE0-2 pins are used to configure the device as shown in Mode select table.
The device can operate in either Master of Slave modes; in Master mode the Frame-sync (Fsync), Shiftclock (SCLK) and left/right channel selection (LRClk) are generated internally. These signals provide the synchronizing for the serial port of the DSP or other control device. Alternatively, Slave mode operation allows the device to be controlled externally.
ADC resolution can be selected as either 16-bit or 18-bit and the conversion results are clocked from the serial port either in little endian or big endian format.
Vol 11, Spring, 1995