Wide-band Analog Interface Circuit

  The TLC32047 wide-band analog Interface circuit (AIC) is a complete analog-to-digital and Digital-to-Analog Interface system for advanced digital signal processors (DSPs) similar to the TMS32020, TMS320C25 and TMS320C30. The TLC32047 offers a powerful combination of options under DSP control: three operating modes [dual-word (telephone interface), word, and byte] combined with two word formats (8 bits and 16 bits) and synchronous or asynchronous operation. It provides a high level of flexibility in that conversion and sampling rates, Filter bandwidths, input circuitry, receive and transmit gains, and multiplexed analog inputs are under processor control. This AIC features a ? band-pass switched-capacitor antialiasing input Filter ? 14-bit-resolution A/D converter ? 14-bit-resolution D/A Converter ? low-pass switched-capacitor output-reconstruction Filter The antialiasing input Filter comprises eighth-order and fourth-order CC-type (Chebyshev/elliptic transitional) low-pass and high-pass Filters respectively. The input Filter is implemented in switched- Capacitor technology and is preceded by a continuous time Filter to eliminate any possibility of aliasing caused by sampled data filtering. When low-pass filtering is desired, the high-pass Filter can be switched out of the signal path. A selectable auxiliary differential analog input is provided for applications where more than one analog input is required. The output-reconstruction Filter is an eighth-order CC-type (Chebyshev/elliptic transitional low-pass filter) followed by a second-order (sin x)/x correction Filter and is implemented in switched-capacitor technology. This Filter is followed by a continuous-time Filter to eliminate images of the sample data signal. The on-board (sin x)/x correction Filter can be switched out of the signal path using digital signal processor control. The A/D and D/A architectures ensure no missing codes and monotonic operation. An internal Voltage Reference is provided to ease the design task and to provide complete control over the performance of the IC. The internal Voltage Reference is brought out to REF. Separate analog and digital voltage supplies and ground are provided to minimize noise and ensure a wide dynamic range. The analog circuit path contains only differential circuitry to keep noise to a minimum. The exception is the DAC sample-and-hold, which utilizes pseudo-differential circuitry. The TLC32047C is characterized for operation from 0?C to 70?C, and the TLC32047I is characterized for operation from ?40?C to 85?C.
Item: TLC32047I
File Size : 36 KB
Pages : 61 Pages

Other Part Numbers in this pdf file

TLC32047IN   TLC32047IFN   TLC32047CN   TLC32047CFN   TLC32047C  
Texas Instruments Incorporated
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