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SP58C20DWR Datasheet(PDF) 1 Page - Texas Instruments |
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SP58C20DWR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 19 page MSP58C20 AUDIOBAND CONVERTER SPSS015B − DECEMBER 1993 − REVISED JULY 1996 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 D Analog Portion of ADC and DAC for Audio-Band Signal-Processing Applications D 5-V Supply Voltage D Oversampling Second-Order Sigma-Delta Modulator D 1.024-MHz Master Clock Frequency D On-Chip Continuous-Time Antialiasing and Smoothing Filters D High-Performance Fully Differential and Symmetrical Analog Data Paths D Internal Reference Voltage and Common-Mode Bias Voltage Generation D Very Low Power Consumption Mode description The MSP58C20 is the analog portion of an audio-band sigma-delta analog-to-digital and digital-to-analog converter and is a companion part to the MSP58C80. The MSP58C20 is designed to operate only with the MSP58C80, which contains the digital portion of the audio-band converter. The circuit consists of three main blocks: the analog-to-digital converter (ADC), the digital-to-analog converter (DAC), and internal reference and bias voltages. The analog-to-digital conversion chain consists of a continuous-time antialiasing stage, an analog oversampled modulator, and the modulator bias voltage. The antialiasing stage is a second-order low-pass filter with a cutoff frequency of typically 190 kHz. The modulator is a sigma-delta feedback loop, which oversamples the signal at 1.024 MHz and provides second-order noise shaping. It performs the conversion of the differential analog input signal to a pulse-density-modulated single-bit digital output (ADOUT). When a maximum positive differential input voltage (i.e., a maximum positive voltage difference of AIP − AIM) is applied at the AIP and AIM inputs, the resulting code at the ADOUT output is all ones. The digital-to-analog conversion chain consists of a fast DAC, an analog low-pass filter, and the filter’s bias voltage. The two input bits (DIGS and DIGL), sampled at 0.512 MHz from a digital modulator on the MSP58C80, are the inputs of the DAC conversion chain. Based on the values for DIGS (the sign bit) and DIGL (the level bit), the following table shows the DAC voltage steps that are produced. DIGS DIGL DAC VOLTAGE STEPS L L −1 × Vref L H −2 × Vref H L +1 × Vref H H +2 × Vref When DIGS = L, the AOM analog output has a more positive voltage than AOP. When DIGL = H, the absolute value of the voltage difference between AOP and AOM is greater than when DIGL = L. A band-gap voltage source is used to produce the DAC and ADC reference voltages. These two references are different to avoid crosstalk between the two converters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright 1996, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VSUB NC VSS AIP AIM PWAD PWDA ADOUT NC NC NC NC AOP AOM DIGS DIGL ADCLK VDD NC NC DW PACKAGE (TOP VIEW) NC − No internal connection |
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