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AD1892 Scheda tecnica(PDF) 4 Page - Analog Devices |
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AD1892 Scheda tecnica(HTML) 4 Page - Analog Devices |
4 / 24 page AD1892 –4– REV. 0 AD1892 PIN LIST Biphase-Mark Serial Input Pin Name SOIC I/O Description RXP 13 I Positive differential biphase-mark serial digital audio receiver input. 20 mV hysteresis. RXN 14 I Negative differential biphase-mark serial digital audio receiver input. 20 mV hysteresis. Serial Output Interface Pin Name SOIC I/O Description SDATA 24 O Serial output, MSB first, containing two channels of 16 to 20 bits (default) of twos-complement data per channel, depending on control register settings. The data can be configured in I2S-justified (default), left-justified, and right-justified orientations, depending on control register settings. See Figure 36 for timing. BCLK 26 O Bit clock output for output data. Frequency is either 32 × F S (packed mode) or 64 × FS (default), depending on control register settings. See Figure 36 for timing. L RCLK 25 O LEFT/ RIGHT clock output for output data. Runs continuously and is a synchronous divide-down from MCLK (MCLK/512). See Figure 36 for timing. SYNC 23 I The SYNC input allows multiple AD1892s in a system to be phase and group delay synchronized to the same LEFT/ RIGHT clock. The SYNC signal resets internal AD1892 counters such that 512 MCLK cycles after the falling edge of SYNC, the AD1892 data will be valid, and the AD1892 L RCLK signal will change state. It is recommended that the SYNC input be used only when the AD1892 is in the 64 × F SOUT BCLK mode (default configuration). GND when not in use. Decoded Channel Status Outputs Pin Name SOIC I/O Description CA 21 O In consumer or professional mode, CA is the inverse of Channel Status Bit 1, Byte 0 ( C1, audio/ nonaudio). CA = 0 indicates nonaudio, CA = 1 indicates audio. CA = 0 can be used to indicate Dolby AC-3 encoded data. CB 20 O In consumer mode, CB is the inverse of Channel Status Bit 2, Byte 0 ( C2, copy/copyright). CB = 0 indicates copy permitted/copyright not asserted; CB = 1 indicates copy inhibited/copyright asserted. In professional mode, CB is defined as EM0, the least significant bit of the two bits that encodes the emphasis status of the audio material. (continued from Page 1) PRODUCT OVERVIEW (Continued) In addition to the Q-channel subcode and Channel Status buff- ers, the AD1892 includes two 8-bit control registers and two 8- bit status registers. The output data interface may be configured in left-justified, I2S-justified and right-justified modes. The AD1892 includes hardware power-down/reset and mute control inputs, and power-down/reset and mute may also be invoked through write to bits in the control registers. The AD1892 operates from a master clock that must be synchronous with the output sample rate at 512 × F S. Cyclic Redundancy Coding (CRC) error detection is performed over the full 80 bits of the received Q-channel subcode information in consumer mode, as well as the full 192 bits of the received Channel Status informa- tion in professional mode. The AD1892 includes a SYNC input (Pin 23) that allows multiple AD1892s in a system to be synchronized to a common LEFT/ RIGHT clock. The AD1892 is offered in a 28-lead SOIC package. It operates over the industrial temperature range from –40 °C to +85°C at a supply voltage from 4.5 V to 5.5 V. The only external components required to support the AD1892 are power supply decoupling capacitors. DEFINITIONS Dynamic Range The ratio of a full-scale input signal to the integrated noise in the passband (0 kHz to ≈20 kHz), expressed in decibels (dB). Dynamic range is measured with a –60 dB input signal and “60 dB” arithmetically added to the result. This measurement technique is consistent with the recommendations of the Audio Engineering Society (AES17-1991) and the Electronic Industries Association of Japan (EIAJ CP-307). Total Harmonic Distortion + Noise Total Harmonic Distortion plus Noise (THD+N) is defined as the ratio of the square root of the sum of the squares of the values of the harmonics and noise to the value of the fundamen- tal input frequency. It is usually expressed in percent (%) or decibels. Interchannel Phase Deviation Difference in input sampling times between stereo channels, expressed as a phase difference in degrees between 1 kHz inputs. Group Delay The time interval required for the frequency components of an input pulse to appear at the converter’s output, expressed in milliseconds (ms). More precisely, the derivative of radian phase with respect to radian frequency at a given frequency. |
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