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MSM6997H Datasheet(PDF) 7 Page - OKI electronic componets |
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MSM6997H Datasheet(HTML) 7 Page - OKI electronic componets |
7 / 21 page ¡ Semiconductor MSM6996H/6996V/6997H/6997V/6998/6999 7/21 RSYNC Receive synchronizing signal input. Eight required bits are selected from serial PCM signals on the PCMIN pin by the receive synchronizing signal. The whole timing signal in the receive section are synchronize by this synchronizing signal. This signal must be synchronize in phase with RCLOCK. The frequency should be 8 kHz ±50 ppm to guarantee the AC characteristics of receive section. However, same as the RCLOCKfrequency, this device can operate in the range of 8 kHz ±2kHz,with no guarantee of adherence to the electrical characteristics in this specification as a catalogue value. Fixing this signal to logic "1" or "0", the receive circuit is driver in a power down state. XSYNC Transmit synchronizing signal input. The PCM output signal from the PCMOUT pin is output in synchronization with this transmit synchronizing signal. All transmit timing signals are triggered to synchronize with this signal. This signal should be synchronized in phase with XCLOCK pulse. The frequency should be 8 kHz ±50 ppm to guarantee the AC characteristics of transmit section. Fixing this signal to logic "1" or "0", the transmit circuit is driver in a power down state. DG Ground of digital signal. This pin is electrically separated from the AG pin in this device. The DG pin must be connected to the AG pin on the printed circuit board to make common to the AG pin. PDN/BS Power down signal input. When this input is held at low level more than 1 ms, the device is put into the power-down mode. PCMOUT PCM signal output. The PCM output signal is output in synchronization with the rising edge of XCLOCK pulse orderly from MSD first. (The first bit of the PCM signal may output at the rising edge of XSYNC pulse, according to the timing of XSYNC and XCLOCK pulse.). During the PCMOUT signal output except the 8-bit pulses, the pin is in an open state, therefore, multiple connections by wired-OR are easily possible at this pin. The code companding law and output code format depend on ITU-T Recommendation G.711, and for the MSM6996H, MSM6996V, and MSM6998 (A-law) the output PCM signals are obtained by inverting the even bits of signals. Input/Output Level +Full scale +0 –0 –Full scale PCMIN/PCMOUT MSM6996 (A-law) MSM6997 ( m-law) 10101010 11010101 01010101 00101010 10000000 11111111 01111111 00000000 MSM6998 (A-law) MSM6999 ( m-law) |
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