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TLC32045I Datasheet(PDF) 8 Page - Texas Instruments |
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TLC32045I Datasheet(HTML) 8 Page - Texas Instruments |
8 / 39 page TLC32044C, TLC32044E, TLC32044I, TLC32044M, TLC32045C, TLC32045I VOICE-BAND ANALOG INTERFACE CIRCUITS SLAS017F − MARCH 1988 − REVISED MAY 1995 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION operation of TLC32044 or TLC32045 with internal voltage reference The internal reference eliminates the need for an external voltage reference and provides overall circuit cost reduction. Thus, the internal reference eases the design task and provides complete control over device performance. The internal reference is brought out to a terminal and is available to the designer. To keep the amount of noise on the reference signal to a minimum, an external capacitor can be connected between REF and ANLG GND. operation of TLC32044 or TLC32045 with external voltage reference REF can be driven from an external reference circuit. This external circuit must be capable of supplying 250 µA and must be adequately protected from noise such as crosstalk from the analog input. reset A reset function is provided to initiate serial communications between the AIC and DSP and to allow fast, cost-effective testing during manufacturing. The reset function initializes all AIC registers, including the control register. After a negative-going pulse on RESET, the AIC is initialized. This initialization allows normal serial port communications activity to occur between AIC and DSP (see AIC DX data word format section). loopback This feature allows the user to test the circuit remotely. In loopback, OUT + and OUT− are internally connected to the IN+ and IN−. Thus, the DAC bits (d15 to d2), which are transmitted to DX, can be compared with the ADC bits (d15 to d2), which are received from DR. An ideal comparison would be that the bits on DR equal the bits on DX. However, there are some difference in these bits due to the ADC and DAC output offsets. The loopback feature is implemented with digital signal processor control by transmitting the appropriate serial port bit to the control register (see AIC DX data word format section). |
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