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TLC32045I Datasheet(PDF) 9 Page - Texas Instruments |
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TLC32045I Datasheet(HTML) 9 Page - Texas Instruments |
9 / 39 page TLC32044C, TLC32044E, TLC32044I, TLC32044M, TLC32045C, TLC32045I VOICE-BAND ANALOG INTERFACE CIRCUITS SLAS017F – MARCH 1988 – REVISED MAY 1995 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 INTERNAL TIMING CONFIGURATION XTAL OSC TMS(SMJ)320 DSP Divide by 135 Commercial External Front-End Full-Duplex Split-Band Filters† TA Register (5 bits) TA’ Register (6 bits) (2’s compl) Adder/ Subtractor (6 bits) Divide by 2 TB Register (6 bits) [ TA = 9 (1)] [ TA = 18 (2)] (6 bits) TX Counter A [ TB = 40; 7.2 kHz] [ TB = 36; 8.0 kHz] [ TB = 30; 9.6 kHz] [ TB = 20; 14.4 kHz] [ TB = 15; 19.2 kHz] TX Counter B RA Register (5 bits) RA’ Register (6 bits) (2’s compl) Adder/ Subtractor (6 bits) Divide by 2 RB Register (6 bits) [RA = 9 (1)] [RA = 18 (2)] (6 bits) RX Counter A [RB = 40; 7.2 kHz] [RB = 36; 8.0 kHz] [RB = 30; 9.6 kHz] [RB = 20; 14.4 kHz] [RB = 15; 19.2 kHz] RX Counter B Divide by 4 d0, d1 = 0,0 d0, d1 = 1,1‡ d0, d1 = 0,1 d0, d1 = 1,0‡ d0, d1 = 0,0 d0, d1 = 1,1‡ d0, d1 = 0,1 d0, d1 = 1,0‡ 576-kHz Pulses 576-kHz Pulses Low-Pass/ (sin x/x Correction Switched Capacitor Filter CLK = 288-kHz Square Wave D/A Conversion Frequency A/D Conversion Frequency/ High-Pass Switched Capacitor Filter CLK Low-Pass Switched Capacitor Filter CLK = 288-kHz Square Wave SHIFT CLK 1.296 MHz (1) 2.592 MHz (2) MSTR CLK 5.184 MHz (1) 10.368 MHz (2) 20.736 MHz (1) 41.472 MHz (2) Optional External Circuitry for Full Duplex Modems 153.6-kHz Clock (1) † Split-band filtering can alternatively be performed after the analog input function via software in the TMS(SMJ)320. ‡ These control bits are described in the AIC DX data word format section. NOTE: Frequency 1 (20.736 MHz) is used to show how 153.6 kHz (for a commercially available modem split-band filter clock), popular speech and modem sampling signal frequencies, and an internal 288-kHz switched-capacitor filter clock can be derived synchronously and as submultiples of the crystal oscillator frequency. Since these derived frequencies are synchronous submultiples of the crystal frequency, aliasing does not occur as the sampled analog signal passes between the analog converter and switched-capacitor filter stages. Frequency 2 (41.472 MHz) is used to show that the AIC can work with high-frequency signals, which are used by high-speed digital signal processors. |
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