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TCM29C13A Datasheet(PDF) 19 Page - Texas Instruments |
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TCM29C13A Datasheet(HTML) 19 Page - Texas Instruments |
19 / 25 page TCM29C13A, TCM29C14A, TCM29C16A, TCM29C17A, TCM129C13A, TC,129C14A, TCM129C16A, TCM129C17A COMBINED SINGLE-CHIP PCM CODEC AND FILTER SCTS030E – AUGUST 1989 – REVISED OCTOBER 1996 19 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION VCC DGND VBB Figure 7. Diode Configuration for Latch-Up Protection Circuitry internal sequencing On the transmit channel, digital outputs PCM OUT and TSX are held in the high-impedance state for approximately four frames (500 µs) after power up or application of VBB or VCC. After this delay, PCM OUT, TSX, and signaling are functional and occur in the proper time slot. The analog circuits on the transmit side require approximately 60 ms to reach their equilibrium value due to the autozero circuit settling time. Valid digital information, such as on/off hook detection, is available almost immediately, while analog information is available after some delay. On the receive channel, the digital output SIGR is also held low for a maximum of four frames after power up or application of VBB or VCC. SIGR remains low until it is updated by a signalling frame. To further enhance system reliability, PCM OUT and TSX are placed in the high-impedance state approximately 20 µs after an interruption of CLKX. SIGR is held low approximately 20 µs after an interruption of CLKR. These interruptions could possibly occur with some kind of fault condition. power-down and standby operations To minimize power consumption, a power-down mode and three standby modes are provided. For power down, an external low signal is applied to PDN. In the absence of a signal, PDN is internally pulled up to a high logic level and the device remains active. In the power-down mode, the average power consumption is reduced 15 mW. Three standby modes give the user the options of placing the entire device on standby, placing only the transmit channel on standby, or placing only the receive channel on standby. to place the entire device on standby, both FSX and FSR are held low. For transmit-only operation (receive channel on standby), FSX is high and FSR is held low. For receive-only operation (transmit section on standby), FSR is high and FSX is held low. When the entire device is in standby mode, power consumption is reduced to an average of 3 mW. See Table 1 for power-down and standby procedures. Table 1. Power-Down and Standby Procedures DEVICE STATUS PROCEDURE TYPICAL POWER CONSUMPTION DIGITAL OUTPUT STATUS Power down PDN low 3 mW TSX and PCM OUT are in the high-impedance state; SIGR goes low within 10 µs. Entire device on standby FSX and FSR are low 3 mW TSX and PCM OUT are in the high-impedance state; SIGR goes low within 300 ms. Only transmit on standby FSX is low, FSR is high 40 mW TSX and PCM OUT are placed in the high-impedance state within 300 ms. Only receive on standby FSR is low, FSX is high 30 mW SIGR is placed in the high-impedance state within 300 ms. |
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